US20130033599A1 - System for monitoring an area adjacent a vehicle - Google Patents

Abstract

A backup camera system for monitoring an area. In one aspect, the system comprises a camera assembly, a display device and a stand; the camera assembly comprising: (i) a camera adapted to produce an image signal corresponding to a perceived image, (ii) means for supplying power; (iii) a base having first and second holes that are configured and spaced from one another so as to facilitate attachment to the vehicle, (iv) a transmitter operably coupled to the camera for wirelessly transmitting the image signal; and the display device comprising: (i) a receiver for receiving the wirelessly transmitted image signal, (ii) means for supplying power, (iii) an image processing unit operably coupled to the receiver for converting the received image signal into a display image that is displayed on the display device. The backup camera system can form a retrofit kit.

Description

CROSS-REFERENCE TO RELATED PATENT APPLICATIONS
• The present application claims the benefit of U.S. Provisional Application 60/949,759, filed Jul. 13, 2007 and U.S. Provisional Application 60/889,631, filed Feb. 13, 2007, the entireties of which are hereby incorporated by reference. The present application is also a continuation-in-part of U.S. Non-Provisional patent application Ser. No. 11/778,339, filed Jul. 16, 2007, which is a continuation in part of U.S. Non-Provisional application Ser. No. 11/567,504, filed Dec. 6, 2006, now U.S. Pat. No. 7,245,207, which claims the benefit of U.S. Provisional Patent Application 60/889,631, filed Feb. 13, 2007, U.S. Provisional Patent Application 60/882,681, filed Dec. 29, 2006 and U.S. Provisional Patent Application 60/826,618, filed Sep. 22, 2006 and is also a continuation-in-part of U.S.Design Patent Application 29/252,238, filed Jan. 20, 2006, now U.S. Design Patent D535,676, U.S.Design Patent Application 29/252,239, filed Jan. 20, 2006, now U.S. Design Patent D536,360, U.S.Design Patent Application 29/252,296, filed Jan. 20, 2006, now U.S. Design Patent D536,011, U.S.Design Patent Application 29/258,861, filed Apr. 28, 2006, now U.S. Design Patent D536,016, and U.S.Design Patent Application 29/258,863, filed Apr. 28, 2006, now U.S. Design Patent D536,012, the entireties of which are hereby incorporated by reference.
FIELD OF THE INVENTION
• The present invention relates generally to safety systems in vehicles, and specifically to systems and methods for facilitating improved monitoring of an area adjacent a vehicle from within the passenger compartment of the vehicle.
BACKGROUND OF THE INVENTION
• When operating a vehicle, it is often difficult to adequately view the areas adjacent the vehicle, especially the area behind the vehicle. This is especially problematic for the operators of larger vehicles such as pick-up trucks, sport utility vehicles (“SUVs”), tractor trailers and other large and/or raised vehicles. The dangers associated with inadequate visibility have become exasperated as the popularity of SUVs has resulted in the widespread operation of larger and raised vehicles by people who are ordinarily not accustomed to operating such vehicles.
• In the past, people have attempted to ameliorate the lack of visibility by placing mirrors at various locations throughout, the car. Mirrors have generally proven to be a reliable method of viewing an area behind the vehicle while in reverse. However, mirrors typically do not provide the vehicle operator with an unobstructed view of the area directly behind the vehicle.
• Recently, cameras and sensors have become popular in order to detect the presence of objects (including people) behind the vehicle. While existing cameras and sensors have prevented many unfortunate events, problems still persist and accidents are still occurring. Moreover, the existence of such sensors and cameras is generally limited to factory installed systems that are typically only present on high-end vehicles. Thus, older and/or less expensive vehicles tend to not have such sensors and/or cameras.
• While some cameras do exist for mounting onto a vehicle, these cameras suffer from a wide variety of deficiencies, including complexity of mounting and less than optimal performance. When mounting a camera on a vehicle, the placement and orientation of the camera are important. Improper mounting may result in the operator not being able to adequately view an object behind the vehicle until it is too late. Many cameras are unable to provide a proper viewing angle for the vehicle upon which it is mounted.
• Additionally, cameras that are mounted on vehicles are exposed to the effects of the environment, such as changes in temperature, humidity, etc. These environmental effects can cause moisture to form on the lens thereby decreasing the effectiveness of the camera.
SUMMARY OF THE INVENTION
• It is therefore an object of the present invention to provide a system and method that provides for improved viewing of the area adjacent a vehicle.
• Another object of the present invention is to provide a system and method that provides for improved viewing of the area behind a vehicle from within the passenger compartment.
• A further object of the present invention is to provide a system for viewing the area adjacent a vehicle that can be properly and easily installed by end users.
• A still further object of the present invention is to provide a system for viewing the area adjacent a vehicle that can be retrofit to existing vehicles.
• A yet further object of the present invention is to provide a system for viewing the area adjacent a vehicle that transmits a wireless signal from the camera to the display device.
• Another object of the present invention is to provide a system for viewing the area adjacent a vehicle that can transmit either a wired and/or wireless signal from the camera to the display device.
• Yet another object of the present invention is to provide a system for viewing the area adjacent a vehicle that allows vertical flipping of the transmitted image.
• Still another object of the present invention is to provide a system and method for viewing the area adjacent .a vehicle that utilizes a camera that can be adjusted without requiring remounting of the camera.
• An even further object of the present invention is to provide a system and method for viewing the area adjacent a vehicle that minimizes fogging of the camera lens.
• A still further object of the present invention is to provide a system and method for viewing the area adjacent a vehicle that provides automatic activation/operation of the component devices.
• A yet further object of the present invention is to provide a system and method for viewing the area adjacent a vehicle that utilizes a display device that can also display images received from a video player in addition to images transmitted from the camera component.
• Even yet another object of the invention is to provide a vehicle having improved capabilities to monitor the adjacent areas.
• These and other objects are met by the present invention, which in a first aspect can be a system for monitoring an area adjacent a vehicle comprising: a retrofit kit comprising a camera assembly, a display device and a stand for supporting the display device; the camera assembly comprising: (i) a camera adapted to produce an image signal corresponding to a perceived image, (ii) means for supplying power; (iii) a base having first and second holes that are configured and spaced from one another so as to facilitate attachment to the vehicle using the vehicle's license plate mounting bolts, (iv) a transmitter operably coupled to the camera for wirelessly transmitting the image signal; and the display device comprising: (i) a receiver for receiving the wirelessly transmitted image signal, (ii) means for supplying power, (iii) an image processing unit operably coupled to the receiver for converting the received image signal into a display image that is displayed on the display device, the display image corresponding to the perceived image.
• In some embodiments, the base may comprise a base structure and a support structure adapted to support the display device. To improve the ability of the operator to view the display device, the support structure may be pivotally connected to the base structure. The support structure may also have means for securing the stand to a surface within a passenger compartment of the vehicle.
• The camera may be pivotally connected to the base in certain embodiments so that the viewing angle of the camera can be adjusted without remounting the camera. In one embodiment, the camera may be pivotally connected to the base so as to pivot solely about a substantially horizontal axis when the base is mounted to the vehicle using the vehicle's license plate mounting bolts.
• The system may also comprise an antenna operably connected to the transmitter. In such an embodiment, it may be preferred that the antenna extend from the camera assembly and be of a sufficient length so that when the camera assembly is mounted to the vehicle using the vehicle's license plate mounting bolts, the antenna can extend into a passenger compartment of the vehicle. Having the antenna located within the passenger compartment of the vehicle, as opposed to the exterior of the vehicle, facilitates improved wireless transmission of the image signal to the display device while staying within FCC mandated power levels
• In another embodiment, a video input port may be operably coupled to the image processor so that a video signal from a separate video player device can be displayed when the camera is not in use. In such an embodiment, a switching circuit may be provided for selecting whether the display image is based on the received image signal from the receiver (i.e., from the camera) or a video signal from the video input port.
• In order to minimize the effects of the environment on the camera's functioning, the camera may also comprise a hermetically sealed space filled with an inert gas for preventing condensation on a lens of the camera.
• In another aspect, the invention can be a system for monitoring an area adjacent a vehicle comprising: a stand for supporting the display device; a camera assembly comprising: (i) a camera adapted to produce an image signal corresponding to a perceived image, (ii) means for supplying power; (iii) a base configured to facilitate attachment to an exterior surface of the vehicle, (iv) a transmitter operably coupled to the camera for wirelessly transmitting the image signal; a display device comprising: (i) a receiver for receiving the wirelessly transmitted image signal, (ii) means for supplying power, (iii) an image processing unit operably coupled to the receiver for converting the received image signal into a display image that is displayed on the display device, the display image corresponding to the perceived image; and the stand comprising: (i) a base structure, (ii) a support structure adapted to support the display device, the support structure pivotally connected to the base structure, and (iii) means located on a bottom surface of the base structure for securing the stand to a surface within a passenger compartment of the vehicle.
• In yet another aspect, the invention can be a system for monitoring an area adjacent a vehicle comprising: a stand for supporting the display device; a camera assembly comprising: (i) a camera adapted to produce an image signal corresponding to a perceived image, (ii) means for supplying power; (iii) a base configured to facilitate attachment to an exterior surface of the vehicle, (iv) a transmitter operably coupled to the camera for wirelessly transmitting the image signal; and a display device comprising: (i) a receiver for receiving the wirelessly transmitted image signal, (ii) means for supplying power, (iii) an image processing unit operably coupled to the receiver for converting the received image signal into a display image that is displayed on the display device, the display image corresponding to the perceived image; (iv) a video input port operably coupled to the image processor, and (v) a switching circuit for selecting whether the display image is based on the received image signal from the receiver or based on a video signal from the video input port.
• In still another aspect, the invention can be a system for monitoring an area adjacent to a vehicle comprising: a camera assembly comprising: (i) a camera adapted to produce an image signal corresponding to a perceived image, (ii) means for supplying power, (iii) a base adapted for mounting to an exterior surface of the vehicle, and (iv) a transmitter operably coupled to the camera for wirelessly transmitting the image signal; and a display device for displaying a display image, the display device comprising: (i) a receiver for receiving the wirelessly transmitted image signal, (ii) means for supplying power, (iii) an image processing unit operably coupled to the receiver for converting the received image signal into the display image, (iv) a video input port operably coupled to the image processor, and (v) a display switching circuit for selecting between displaying the received image signal as the display image and displaying a video signal from the video input port as the display image.
• In a further aspect, the invention can be a system for monitoring an area adjacent to a vehicle comprising: a camera assembly, a display device and a video cable; the camera assembly comprising: (i) a camera adapted to produce an image signal corresponding to a perceived image, (ii) means for supplying power, (iii) a base having first and second holes that are configured and spaced from one another so as to facilitate attachment to the vehicle using the vehicle's license plate mounting bolts, (iv) a transmitter operably coupled to the camera for wirelessly transmitting the image signal, and (v) a video-out port operably coupled to the camera for wired transmission of the image signal; the display device for displaying a display image, the display device comprising: (i) a receiver for receiving the wirelessly transmitted image signal, (ii) means for supplying power, (iii) an image processing unit operably coupled to the receiver for converting the received image signal into the display image, (iv) a video input port operably coupled to the image processor, and (v) a display switching circuit for selecting between displaying the received image signal as the display image and displaying a video signal from the video input port as the display image; and the video cable having a first end plug adapted for operable insertion into the video-out port of the camera assembly and a second end plug adapted for operable insertion into the video input port of the display device
• In a still further aspect, the invention can be a system for monitoring an area adjacent to a vehicle comprising: a camera assembly comprising: (i) a camera adapted to produce an image signal corresponding to a perceived image, (ii) means for supplying power, (iii) a base configured to facilitate attachment to an exterior surface of the vehicle, and (iv) a transmitter operably coupled to the camera for wirelessly transmitting the image signal; the display device for displaying a display image, the display device comprising: (i) a receiver for receiving the wirelessly transmitted image signal, (ii) means for supplying power, (iii) an image processing unit operably coupled to the receiver for converting the received image signal into the display image; and the camera being pivotally connected to the base.
• In another aspect, the invention can be a system for monitoring an area adjacent a vehicle comprising: a base adapted to be rigidly mounted to the vehicle; a camera pivotally connected to the base and adapted to produce an image signal corresponding to a perceived image, wherein the base comprises an elongated plate extending from a first end to a second end, the camera pivotally connected to the base so as to be substantially equidistant from the first and second ends of the elongated plate, the elongated plate comprising first and second holes that are configured and spaced from one another so as to facilitate attachment to the vehicle using the vehicle's license plate mounting bolts; a transmitter operably coupled to the camera for wirelessly transmitting the image signal; a display device adapted to be mounted within a passenger compartment of the vehicle, the display device comprising a receiver for receiving the wirelessly transmitted image signal; an image processing unit operably coupled to the receiver for converting the received image signal into a display image that is displayed on the display device, the display image corresponding to the perceived image; and wherein the camera is pivotally connected to the base so as to pivot about a substantially horizontal axis when the base is mounted to the vehicle using the vehicle's license plate mounting bolts.
• In a yet further aspect, the invention can be an automobile comprising: a passenger compartment having an automobile operator section; a rear portion; a camera assembly mounted to an exterior surface of the rear portion, the camera assembly comprising: (i) a camera adapted to produce an image signal corresponding to a perceived image adjacent the rear portion, (ii) power supply wires extending into the passenger compartment and operably connected to a power source, (iii) a transmitter operably coupled to the camera for wirelessly transmitting the image signal, and (iv) an antenna operably coupled to the transmitter, the antenna extending from the camera assembly and into the passenger compartment; and a display device positioned in the passenger compartment at a location visible from the operator section, the display device comprising: (i) a receiver for receiving the wirelessly transmitted image signal, (ii) a power supply, and (iii) an image processing unit operably coupled to the receiver for converting the received image signal into a display image that is displayed on the display device, the display image corresponding to the perceived image.
• In a still further aspect, the invention can be an automobile comprising: a passenger compartment having an automobile operator section; a rear portion; a camera assembly mounted to an exterior surface of the rear portion, the camera assembly comprising: (i) a camera adapted to produce an image signal corresponding to a perceived image adjacent the rear portion, (ii) power supply wires operably connected to a power source, and (iii) a transmitter operably coupled to the camera for wirelessly transmitting the image signal; and a display device positioned in the passenger compartment at a location visible from the operator section, the display device comprising: (i) a receiver for receiving the wirelessly transmitted image signal, (ii) means for supplying power, (iii) an image processing unit operably coupled to the receiver for converting the received image signal into a display image that is displayed on the display device, the display image corresponding to the perceived image; (iv) a video input port operably coupled to the image processor, and (v) a switching circuit for selecting whether the display image is based on the received image signal from the receiver or a video signal from the video input port.
• In another aspect, the invention can be an automobile comprising: a passenger compartment having an automobile operator section; a rear portion; a camera assembly mounted to an exterior surface of the rear portion, the camera assembly comprising: (i) a camera adapted to produce an image signal corresponding to a perceived image adjacent the rear portion, and (ii) power supply wires operably connected to a power source; and a display device positioned in the passenger compartment at a location visible from the operator section, the display device comprising: (i) a receiver for receiving the wirelessly transmitted image signal, (ii) a 12 volt cigarette-lighter plug adapter, and (iii) an image processing unit operably coupled to the receiver for converting the received image signal into a display image that is displayed on the display device, the display image corresponding to the perceived image; and a transmitter operably coupled to the camera for wirelessly transmitting the image signal, the transmitter located within the passenger compartment.
BRIEF DESCRIPTION OF THE DRAWINGS
• FIG. 1 is a perspective view of a backup camera system comprising a camera assembly, a display device and a stand according to one embodiment of the present invention.
• FIG. 2 is a front view of the display device ofFIG. 1 positioned within the stand ofFIG. 1.
• FIG. 3A is a rear view of the camera assembly ofFIG. 1.
• FIG. 3B is a top view of the camera assembly ofFIG. 1.
• FIG. 3C is a front view of the camera assembly ofFIG. 1.
• FIG. 3D is a cross-sectional view of the camera assemblyFIG. 1 along the line A-A ofFIG. 3C.
• FIG. 4 is a rear view of the camera assembly ofFIG. 1 wherein a portion of its antenna is removed from the wire casing.
• FIG. 5A is a front view of a positioner that can be used for mounting the camera assembly ofFIG. 1 at an angle, according to one embodiment of the present invention.
• FIG. 5B is a side view of the positioner ofFIG. 5A.
• FIG. 6 is a schematic illustrating the mounting of the camera assembly ofFIG. 1 to an exterior surface of a vehicle using the positioner ofFIG. 5A, according to one embodiment of the present invention.
• FIG. 7A is a high level electrical schematic of the camera assembly ofFIG. 1, according to one embodiment of the present invention.
• FIG. 7B is a high level electrical schematic of the display device ofFIG. 1, according to one embodiment of the present invention.
• FIG. 8A-8C collectively form an electrical schematic of an image sensor circuit of the camera assembly ofFIG. 1, according to one embodiment of the present invention.
• FIG. 9A-9D collectively form an electrical schematic of the transmitter circuit of the camera assembly ofFIG. 1, according to one embodiment of the present invention.
• FIG. 10A-10D collectively form an electrical schematic of a receiver circuit of the display device ofFIG. 1, according to one embodiment of the present invention.
• FIG. 11 is an electrical schematic for the CPU, the display, and power supply of the display device ofFIG. 1, according to one embodiment of the present invention.
• FIG. 12 is a schematic top view of a first alternative embodiment of an adjustable camera assembly that can be used in the backup camera system ofFIG. 1, wherein the camera is pivotally connected to the base.
• FIG. 13 is a side view of the adjustable camera assembly ofFIG. 12.
• FIG. 14 is a perspective view of the adjustable camera assembly ofFIG. 12 wherein a portion of the base's housing is removed so that the interior mechanism for pivoting the camera is visible.
• FIG. 15 is a perspective view of the adjustable camera assembly ofFIG. 14 wherein the camera has been removed.
• FIG. 16 is a top view of the interior pivoting mechanism of the adjustable camera assembly ofFIG. 12 removed from the base.
• FIG. 17 is a side schematic view of the adjustable camera assembly ofFIG. 12 mounted to an exterior surface of a vehicle according one embodiment of the invention.
• FIG. 18 is a top view of a second alternative embodiment of an adjustable camera assembly that can be used in the backup camera system ofFIG. 1, wherein the camera is pivotally connected to the base.
• FIG. 19 schematically illustrates how the camera of the adjustable camera assembly ifFIG. 19 can be pivoted.
• FIG. 20 is a front view of a first alternative embodiment of a multi-input display device that can be used in the backup camera system ofFIG. 1, according to one embodiment of the present invention.
• FIG. 21 is a high-level operational schematic of a backup camera system utilizing the multi-input display device ofFIG. 20 in conjunction with a video player, according to another embodiment of the present invention.
• FIG. 22 is a high-level operational schematic of a backup camera system utilizing the multi-input display device ofFIG. 20 in conjunction with a video player connected to a modulator, according to another embodiment of the present invention.
• FIG. 23 is a schematic of a combined wired-wireless backup camera system according to one embodiment of the present invention.
• FIG. 24 is a high-level operational schematic of combined wired-wireless camera assembly according to one embodiment of the present invention.
DETAILED DESCRIPTION OF THE DRAWINGS
• Referring toFIG. 1 abackup camera system1000 in accordance with one embodiment of the present invention is illustrated. Thebackup camera system1000 generally comprises acamera assembly100, adisplay device200 and astand300. Thebackup camera system1000 is designed so that when thebackup camera system1000 is installed on a vehicle, the operator of the vehicle will be able to view a desired area adjacent the vehicle from the operator section of the passenger compartment. While thebackup camera system1000 and its installation will be described throughout this application in relation to viewing the area directly behind the vehicle, it is to be understood that the invention can be used to view any area adjacent the vehicle if desired.
• Thebackup camera system1000 is specifically designed for ease of installation by the end user. As such, it is preferred that thebackup camera system1000 be a retrofit kit for installation onto existing vehicle's that do not have a factory-installed backup camera system. In one embodiment, the retrofit kit is to include, without limitation, the camera assembly100 (or any of its alternative embodiments), the display device200 (or any of its alternative embodiments), thestand300, a12 volt cigarettelighter adaptor400 for supplying power to the display device200 (and/or a wiring harness for providing power to the display device200), fasteners for mounting thecamera assembly200 to an exterior surface of a vehicle (such as license plate nuts and bolts and/or screws), a fastener for securing thestand300 to a surface within a passenger compartment of a vehicle (such as a hook-and-loop fastener, a piece of double-sided tape, etc.), cable ties, Scotch-Lok™ connectors, a video cable of sufficient length to facilitate the wired transmission of image signals from thecamera assembly100 to thedisplay device200, and avideo cable870C (FIG. 23) for supplying video signals from a separate video player to thedisplay device200. Of course, the retrofit kit may not include all of the aforementioned components. The exact components included in any retrofit kit will be dictated by the functional capabilities and structural particulars of thebackup camera system1000 to be provided and its intended installation.
• Referring now to FIGS.1 and3A-3D concurrently, the structural aspects of thecamera assembly100 will be described in detail. With the exception of certain minor details, thecamera assembly100 is a symmetric structure with respect to both its horizontal and vertical axes. Generally, thecamera assembly100 comprises acamera portion110 and abase portion120. Thebase portion120 is provided so that thecamera assembly100 can be mounted to the desired exterior surface of a vehicle. More specifically, thebase portion120 is adapted to be rigidly mounted to a vehicle using the vehicle's license plate mounting holes so that thecamera portion110 is facing rear of the vehicle so that objects behind the vehicle can be detected by the vehicle's operator, even when the objects are out of the operator's natural and/or mirror-assisted field of vision.
• Thebase portion120 comprises a pair ofelongated flanges121 that extend from thecamera portion110 in opposite directions. Stated another way, theflanges121 extend in a lengthwise direction from thecamera portion110 at approximately 180° apart from one another. Theflanges121 can be formed from a single elongated plate or from separate plates that assembled to one another and/or thecamera portion110. Eachflange121 comprises ahole122 extending through its major face. Each of theholes122 are spaced an approximately equal distance from thecamera portion110 and an approximately equal distance from theends123 of theflanges121.
• Theholes121 are located and designed to be used to secure thecamera assembly100 to the vehicle using the vehicle's license plate mounting holes via fasteners70 (FIG. 6), such as bolts or screws. Specifically, theholes121 are separated from one another by a linear distance that corresponds to the standard linear distance between the license plate mounting holes of vehicles, which is typically between 6-8 inches. Theholes121 are preferably oval shaped so as to provide a clearance in order to accommodate for differences that may exist between the license plate bolt holes of different vehicles. Of course, theholes121 may have other geometric shapes depending upon the respective needs of the attachment devices and the hardware used.
• Referring still to FIGS.1 and3A-3D concurrently, thecamera portion110 is centrally located on thebase portion120. Thecamera portion110 comprises ahousing111 that encloses and protects all of the necessary electrical components (including thecamera130 and transmitter125) and internal circuitry to achieve the functions of thebackup camera system1000 discussed in this application. The internal circuitry and electrical components of thecamera assembly200 are described in greater detail below in reference toFIGS. 7A,8 and9.
• Anopening112 is provided in atruncated cone structure118 that protrudes from thefront wall113 of thehousing111. The opening provides a viewing passageway for the internally locatedcamera130. Thecamera lens114 protrudes from and encloses theopening112. Thecamera lens114 is connected to thehousing111 so that a hermetic seal is formed between thelens114 and thehousing111, thereby hermetically sealing theopening112. This can be accomplished through the use of an appropriate gasket seal, O-ring, adhesion, a threaded fit, thermal welding, or other means known in the art.
• Thelens114 has a vertical viewing angle of up to 80° and a horizontal viewing angle of 110° . The vertical viewing angle may be up to 100° and the horizontal viewing angle may be up to 170° . The invention, however, is in no way limited by the viewing area of the lens utilized. Thelens114 has an ultra-violet coating for light gathering and amplification. In some embodiments, it may be preferred that thelens114 be provided with an additional layer of coating in order to prevent scratching from small accidents or other events. Alternatively, theentire lens114 may be constructed out of materials such as plastics, or polycarbonate.
• Thecamera assembly100 further comprises awire115 that extends from anopening117 in therear wall116 of thehousing111. As will be discussed in greater detail below with respect toFIG. 4, thewire115 comprises both theelectrical power wires140 that are to be connected to a power source of the vehicle and an external antenna cable150 (or wire operably coupling an external transmitter to the camera130). As with theopening112, theopening117 through which thewire115 extends is preferably heretically sealed through the use of a gasket, O-ring or other means. Of course, thewire115 can consist of multiple other cables. In other embodiments of thecamera assembly100, one or more female ports can be provided in thehousing111 and operably coupled to the internal circuitry as needed so that the power supply wires, antennas, video cables and other cables can be operably connected to thecamera assembly100.
• The hermetic sealing of thehousing111 keeps liquids away from the electrical circuitry and components of thecamera assembly100, which will often be directly exposed directly to the harsh weather conditions during travel. As such, all possible openings into and out of the space within thehousing111 that holds moisture sensitive components should be sealed watertight, using a gasket seal, or some other type of mechanism that is able to prevent the entry of moisture. During manufacture, the space within thehousing111 is preferably backfilled and pressurized with an inert gas, which may be a non-reactive gas, such as CO₂, N₂(nitrogen gas), or a noble gas such as helium, xenon, etc. in order to purge all moisture from thecamera111 and from the components of thetransmitter125. Removal of the moisture from thehousing111 prevents thelens114 from becoming clouded or fogged when it is exposed to the variable conditions of the environment.
• Referring now toFIGS. 1 and 2 concurrently, the structural and functional details of thestand300 will be described. Generally, thestand300 comprises abase structure310 andsupport structure320. Thesupport structure320 is pivotally connected to thebase structure310 via aswivel member330, which is in the form of a ball joint. In other embodiments, theswivel member330 may be an axel-like pivot structure or any other type of pivoting joint.
• Thesupport structure320 is a sleeve-like structure that is adapted to receive and support thedisplay device200. Thesupport structure320 comprises arear wall321 and afront wall322 that forms acavity323 therebetween. An open top end of thesupport structure320 provides an opening through which thedisplay device200 can be slidably lowered into thecavity323. Thecavity323 is sized and shaped to receive and accommodate thedisplay device200, thereby supporting thedisplay device200 in an upright position for viewing (as shown inFIG. 2).
• Thefront wall322 of thesupport structure320 comprises acutout324. Thecutout324 is sized, shaped and positioned so that when thedisplay device200 is positioned within thecavity323, thedisplay screen207 of thedisplay device200 is aligned with thecutout324 so as to afford an unobstructed view of thedisplay screen220 and/or access to the controls210-213 of thedisplay device200.
• Thesupport structure320 further comprises anotch325 in one of its side walls. Thenotch325 is located on thesupport structure320 so that when thedisplay device200 is positioned within thecavity323, the notch is aligned with and provides access to a female power supply port (not illustrated) located on a side surface of thedisplay device200. As a result of this alignment, the jack end of the12 volt cigarettelighter adapter400 can be operably inserted into and removed from thedisplay device200 as desired without having to remove thedisplay device200 from thecavity323 of thesupport structure320. Depending on the number and location of ports and/or controls located on thedisplay device200, one or more notches, cutout and/or opening may be provided and suitably located on thesupport structure320 so as to provide access to the ports and/or controls when thedisplay device200 is positioned within thecavity323.
• Thesupport structure320 also comprises a securing means (not visible) that secures thedisplay device200 to thesupport structure320 so that thedisplay device200 can not become accidentally separated and/or dislodged from thesupport structure320. The securing means can take on a wide variety of embodiments, such as a piece of double-sided tape located on either an inner surface of thecavity323 of thesupport structure320 or on thedisplay device200, a male-female snap-lock system co-operationally positioned on thesupport structure320 and thedisplay device200, a hook-and-loop fastener system co-operationally positioned on thesupport structure320 and thedisplay device200, a tight-fit assembly between thesupport structure320 and thedisplay device200, a latching mechanism, a screw, a nut and bolt assembly, a threaded assembly, a strap, a band, etc. In the sleeve-like embodiment of thesupport structure320, the relative size and shape of thecavity323 of thesupport structure320 with respect to thedisplay device200 is designed to cradle thedisplay device200 in a manner that prevents dislodgment.
• Referring now solely toFIG. 2, thestand300 further comprises a securing means, generically illustrated asbox element340, located on the bottom surface of thebase structure310. The securing means340 is used to mount thestand300 to an interior surface within the passenger compartment of the vehicle that is visible by the vehicle's operator, such as the dashboard surface. The securing means340 may be an adhesive material, such as double-sided tape, that is placed on the bottom surface of thesupport structure320 so that thestand310. Alternatively, the securing means340 may be a hook-and-loop fastener tape wherein either the hook tape or the loop tape is attached to the dashboard and the other one of the hook tape or the loop tape is attached to thebase structure310 of thestand300. This permits thestand300 to be easily placed and removed from the interior of the vehicle.
• While the illustrated embodiment of thesupport structure320 is a sleeve-like structure, the invention is not so limited. In other embodiment, thesupport structure320 can take on a wide variety shapes, sizes and structural arrangements so long as it capable of supporting thedisplay device200.
• Preferably thestand300 and thedisplay device200 are placed in a location within the passenger compartment of the vehicle where the operator of the vehicle can see thedisplay screen207, such as the dashboard Alternatively, thedisplay device200 may be attached to the visors used in a vehicle, to the rear-view mirror, or to the windshield. When mounting thedisplay device200 directly to a visor or mirror it may not be necessary to use thestand300.
• Referring again toFIGS. 1 and 2 concurrently, thedisplay device200 of thebackup camera system1000 will be described in greater detail. Thedisplay device200 is a compact structure that is designed to be placed within a passenger compartment of a vehicle at a location visible by the operator of the vehicle. Thedisplay device200 comprises ahousing205 which acts as the main body of thedisplay device200. The circuitry and electrical components that enable the operation, functioning and control of thedisplay device200 are located within thehousing205. Reference can be made toFIGS. 6b,9 and10, and the corresponding discussion, for more detailed information regarding the circuitry and electrical components of thedisplay device200.
• Thedisplay device200 also comprises adisplay screen207 for displaying images. Thedisplay screen207 is preferably sized in order to provide the operator of a vehicle with an adequate view of the images displayed on thedisplay screen207. In one embodiment, thedisplay screen207 is roughly2.5 inches when measured diagonally. However it is to be understood that the size ofdisplay screen207 is in no way limiting of the present invention and can be any size desired. The exact size of thedisplay screen207 will depend upon the size of the vehicle's interior space, the viewing needs of the operator of the vehicle and the target price of the retrofit kit. Thedisplay screen207 may be a thin film liquid crystal display, or alternatively some other type of display device that is capable of being able to produce an image.
• Thedisplay device200 further comprises a plurality of control buttons210-213. The control buttons210-213 are located on the front surface of thehousing205 adjacent thedisplay screen207. Both the display screen and control buttons210-213 are visible when the display screen is supported by thestand300. The control buttons210-213 are operably connected to the corresponding circuitry and/or electrical components of thedisplay device200. As a result, the control buttons210-213 control the various features and functions of thecamera assembly100 and/or thedisplay device200. While the user controls are exemplified as buttons210-213, any other type of control mechanisms can be utilized to operate and/or control the components of thebackup camera system1000, including without limitation knobs, switches, slide switches, a touch screen, touch sensitive wheel, a remote control, a microphone for facilitating voice control, etc.
• In the illustrated embodiment, the control buttons on thedisplay device200 include anincrease brightness button210, a view adjustbutton211, apower button212 and adecrease brightness button213. The buttons210-213 may be depressed to activate and/or deactivate the corresponding functionality.
• Depressing theincrease brightness button210 increases the brightness of thedisplay screen207. Similarly, depressing thedecrease brightness button213 decreases/lowers the brightness of thedisplay screen207. If desired, the control features of theincrease brightness button210 and thedecrease brightness button213 can be combined into a single control button.
• Depressing the view adjustbutton211 results in a rotation and/or inversion of the image displayed on the display screen as compared to how that image is perceived by thecamera assembly100. For example, the view adjust button211 (and its corresponding circuitry) is adapted to adjust and/or change the image displayed in thedisplay screen207 to be a forward image, a mirror image, a forward upside down image, a mirror upside down image, or some other alternative image type of the actual image perceived by thecamera assembly100. Depressing the view adjustbutton211 results in a cycling of the different image types being displayed on thedisplay screen207.
• In the event that more than onecamera assembly100 is used in a singlebackup camera system1000, it is possible to have the view adjust button211 (and its corresponding circuitry) act as a switching mechanism that switches between displaying the images perceived by the different cameras assemblies of thebackup camera system1000. The view adjust button211 (and its corresponding circuitry) can also act as a switching mechanism in embodiments where thedisplay device200 has multi-input capabilities (such as the embodiments ofFIGS. 20-22, which are discusses later in this application). Of course, a separate control button and/or control mechanism can be used to manually cycle and/or switch between the different images and/or image types if desired.
• Thepower button212 turns thedisplay device200 on and off. In addition to the control buttons210-213, thedisplay device200 also includes astatus light214 that indicates whether or not thedisplay device200 is powered on or not. Thestatus light214 is located on the front surface of thehousing205 so as to be visible from an operator section of the passenger compartment. It is to be understood that thedisplay device200 can have additional buttons, knobs and/or dials for controlling either thedisplay device200 or thecamera assembly100 as desired.
• Furthermore, in some embodiments of the invention, certain functions can be automated by programming the internal processor of thedisplay device200 to automatically perform certain functions upon detecting an event, such as the presence of a signal. For example, in one embodiment of the invention, so long as thedisplay device200 is operably coupled to a power source, the display device200 (and thus the display screen207) is automatically activated upon receipt of an image signal sent from the transmitter of thecamera assembly100. Utilizing such automated activation of thedisplay device200 ensures that the operator of the vehicle has access to the visibility afforded by thebackup camera system1000 without being required to manually activate thedisplay device200. In a further embodiment, the circuitry of thedisplay device200 is designed so that the display device200 (and thus the display screen207) is automatically activated upon the starting the vehicle or when the car is placed into a certain gear, such as reverse.
• In the exemplified embodiment, thebackup camera system1000 further comprises a 12volt power adapter400 for supplying power to thedisplay device200. The 12volt power adapter400 is aflexible power wire402 comprising a first end having a cigarette-lighter plug401 and a second end having a standard male jack (not illustrated) for inserting into the female power supply port (not illustrated) of thedisplay device200. Of course, other power supply wires and apparatus can be used. For example, thedisplay device10 can be powered by batteries. In another embodiment, thedisplay device200 is powered by a power cable attached to the vehicle's fuse block. This setup enables thedisplay device200 to be automatically activated when the vehicle is turned on.
• In a further embodiment, thedisplay device200, as well as thecamera assembly100, can be hardwired to the reverse light circuit of the vehicle. This setup enables thedisplay device200 to be automatically activated when the vehicle is placed into reverse and automatically deactivated when the vehicle is placed into a gear other than reverse.
• Referring now toFIG. 4, the details of the power supply, antenna and wireless image signal transmission of thecamera assembly100 will be discussed. As discussed above, awire115 extends from therear wall116 of the housing111 (which holds the circuitry and electrical components of the camera assembly). In reality, thewire115 is actually a combination of multiple wires and antenna components. More specifically, thewire115 comprisespower supply wires140 and anexternal antenna cable150. Theexternal antenna cable150 runs adjacent to thepower supply wires140. This adjacent relationship between theexternal antenna cable150 and thepower supply wires140 is achieved by encasing theexternal antenna cable150 and the relevant portion of thepower supply wires140 with a piece of heat shrink tubing160 (a portion of theexternal antenna cable150 is shown removed from theheat shrink tubing160 for illustrative purposes). Of course, other equivalent structures can be used to maintain the adjacent relationship between theexternal antenna cable150 and thepower supply wires140, including without limitation clasps, ties, bands, adhesion, string, thermal welding, clamps, etc. While maintaining theexternal antenna cable150 adjacent to thepower supply wires140 is preferred, the external antenna cable150 may not be so maintained in some embodiments.
• Thepower supply wires140 are of a sufficient length so that when thecamera assembly100 is mounted to an exterior surface of a rear portion of a vehicle, such as the license plate, thepower supply wires140 can be extended into the passenger compartment of the vehicle and operably connected to a power source, such as the reverse light circuit. In one embodiment, thepower supply wires140 are between 8 to 12 feet. Similarly, theexternal antenna cable150 is of a sufficient length so that when thecamera assembly100 is mounted to an exterior surface of a rear portion of a vehicle, such as the license plate, theexternal antenna cable150 also extends into the passenger compartment. In one embodiment, theexternal antenna cable150 is between 8 to 16 inches in length. Thus, maintaining the adjacent relationship between theexternal antenna cable150 and thepower supply wires140 with theheat shrink tubing160 ensures that theexternal antenna cable150 extends into the passenger compartment of the vehicle during installation and hook-up of thecamera assembly100 to a power source within the passenger compartment of the vehicle. As used throughout this specification, the passenger compartment of the vehicle includes the trunk area, passenger area and operator area of the vehicle.
• While the exemplified embodiment of thecamera assembly100 ofFIG. 4 utilizespower supply wires140 for power, other embodiments of the camera assembly may100 utilize an internal power supply, such as a battery, to supply the necessary power to thecamera assembly100. In still other embodiments, the power supply of thecamera assembly100 can be provided by a cable that operably attached to thedisplay device200. Such a wire can serve the dual function of signal transmission and power supply in hard-wired embodiments of thebackup camera system1000.
• Still referring toFIG. 4, theexternal antenna cable150 comprises acoaxial cable151. A first end of thecoaxial cable151 is operably coupled to the transmitter125 (FIG. 3D) located within thehousing111 while a second end is adapted to act as an antenna. More specifically, the second end of thecoaxial cable151 comprises aground plane housing152 and anantenna portion153 extending therefrom. Theantenna portion153 wirelessly transmits the image signal that corresponds to image perceived by thecamera130. Of course other arrangements can be used for the antenna. For example, a simple wire may extend from the transmitter that acts as an antenna.
• By utilizing an external antenna arrangement and positioning theantenna cable150 within the passenger compartment of the vehicle, the 2.4 GHz wireless image signal emitted from thetransmitter125 does not have to penetrate the steel body of the vehicle and has to travel a reduced distance to the wireless signal receiver located within the display device200 (which is positioned at a location viewable by the operator of the vehicle). As a result, the likelihood of the emitted wireless image signal arriving at the receiver with sufficient strength so as to yield a stable image on thedisplay screen207 is increased. This is important because the output power of thetransmitter125 of thecamera assembly100 may not be increased above certain thresholds in the U.S. due to FCC regulations.
• In an alternative embodiment of thecamera assembly100, the entire transmitter itself may be located externally of thehousing111 and operably coupled to thecamera130 via a flexible cable/wire. In such an embodiment, the transmitter may be located within a second housing that is located within the passenger compartment of the vehicle. As with the other embodiments, locating the entire transmitter inside the vehicle improves the signal strength and reduces interference from external devices.
• In another alternative embodiment of thebackup camera system1000, thecamera assembly100 may be hard-wired directly to the display device rather than utilizing a wireless signal. In fact, as will be discussed in greater detail below with respect toFIG. 23, thebackup camera system1000 can be adapted to have both wired and wireless signal transmission capabilities.
• Referring now toFIGS. 5A and 5B concurrently, the details of thepositioners40 provided with the retrofit kit to mount thecamera assembly100 to an exterior surface of a vehicle that optimizes the vertical viewing angle will be described. Thepositioners40 comprise a ring-like body41 that forms aninternal hole42. Thehole42 is circular in shape and extends through thebody41 of thepositioner40 from thefront surface43 to therear surface44. While not illustrated, the inner surface of thepositioner40 that forms thehole42 may be sloped/tapered so as to assist in the proper orientation and guiding of a fastener (e.g., screw70) through thehole42 during the mounting process. While thepositioner40 is exemplified as a generally circular ring-like structure, other shapes can be utilized, such as u-shape, rectangular, etc. Thepositioners40 can be made of any material, including without limitation flexible plastics, rubbers, metals, metal alloys, wood, etc. A flexible and/or resilient material is preferred but not necessary.
• The side view of thepositioner40 shown inFIG. 5B revels that thepositioner40 is a tapered structure (with respect to its thickness). The tapered nature of thepositioner40 is achieved by orienting the front andrear surfaces44,43 at an acute angle θ with respect to one another. The angle θ is preferably between 15-75°. However, the exact angle θ to be used will depend on the specific needs of the vehicle to which thecamera assembly100 is to be mounted, such as the distance between the mounting location of thecamera assembly100 and the ground (e.g. the difference between the height of a sports utility vehicle and a sedan).
• In the exemplified embodiment of thepositioner40, thefront surface43 slopes downward toward therear surface44 thereby forming a wedge-like structure. When used to mount thecamera assembly100, the tapered/wedge nature of thepositioner40 allows the user to orient thecamera assembly130 at an angle θ with respect to the surface of the vehicle to which thecamera assembly100 is mounted. Thepositioners40 allow the user to install thecamera assembly100 at a vertical angle that optimizes the viewing area for his/her specific vehicle.
• In some embodiments of the retrofit kit and/orbackup camera system1000, a plurality of sets ofpositioners40 wherein each set has different angles θ may be provided so that the user can select a most optimal mounting angle for that specific vehicle.
• Referring now toFIG. 6, an embodiment of a procedure for mounting thecamera assembly100 to arear portion90 of a vehicle utilizing thepositioners40 will be described. First, fourpositioners40 having the desired angle θ are selected. Thecamera assembly100 is then aligned with the desired mounting area on the vehicle, which in the illustration is over thelicense plate95. More specifically, thecamera assembly100 is aligned with thelicense plate95 so that theholes122 on theelongated flanges120 of the camera assembly are aligned with the plate holes96.
• A first pair ofpositioners40A are then positioned betweenlicense plate95 and thecamera assembly100 so that theholes42A are aligned with theholes96 and the flange holes122. Thesloped surface43A of thepositioners40A face away from the vehicle and slope downward toward the vehicle. A second pair ofpositioners40B are then position on the opposite side of thecamera assembly100 so that the holes.42B are also aligned with the plate holes96, theholes42A and the flange holes122. Thesloped surface43B of thepositioners40B face the vehicle and also slope downward toward the vehicle.
• Screws70 (or other fastener) are then inserted through theholes42B of thesecond positioners40B, through the flange holes122 of thecamera assembly100, through theholes42A of thefirst positioners40A, through the plate holes96 and into the licenseplate mounting holes96 of the vehicle. Through threaded engagement, thecamera assembly100 is mounted to therear portion90 of the vehicle.
• The two pairs ofpositioners40A,40B cooperate to not only orient thecamera assembly100 so that it is pointing downward in an angled manner from the vehicle but also give the head of the screws70 a flush surface to which to engage. The angled mounting permits the camera assembly to view at an optimal vertical angle.
• It should be understood that mounting thecamera assembly100 is not limited to the method described above. Other means for mounting thecamera assembly100 to the vehicle may be used, such as adhesives, magnets, etc. It may also be possible to mount thecamera assembly100 so that the direction in which it points is controllable from the inside of the vehicle. This may be accomplished though the use of servo-motors or other devices operably attached to the interior of thecamera assembly100 so that it can adjust and orient thecamera130.
• Referring now toFIG. 7A, a high level schematic of the electronic components and circuitry of thecamera assembly100 is illustrated. As mentioned above, these electronic components and circuitry are located within thehousing111 in one embodiment of the instant invention. Animage sensor711 is operably connected to thelens114. Theimage sensor711 converts light received through the lens114 (which corresponds to a perceived image) into electrical impulses. Theimage sensor711 may be a CMOS, or some other appropriate sensor.
• Theimage sensor711 is operably coupled to an imagesignal processing circuit722. The imagesignal processing circuit722 takes the information (which is in the form of electrical impulses) received from theimage sensor711 and converts it into an image signal having a format that can be used by thedisplay device200. Connected to the imagesignal processing circuitry722 is atransmitter125. Thetransmitter125 comprises a 8 Mhz crystal controlledoscillator718,a phased lockedloop716 and aphase array714. The a 8 Mhz crystal controlledoscillator718 and the phased lockedloop716 generate a 2.4 GHz RF signal based on the received image signal from the imagesignal processing unit722. This produced signal is then sent to thephase array114 for isolation and amplification. The amplified signal is then sent to theantenna153, is tuned for 2.4 GHz, and wirelessly transmitted to thedisplay device200. It is possible to transmit the signal at other frequencies if desired.
• The circuitry of thecamera assembly100 also includes a switchingpower supply circuit724. The switchingpower supply circuit724 is provided for creating +3.3 V and +5V from the 12 volt DC energy from the vehicle. This provides power to thecamera130. The power is typically gathered through thepower supply wires140, shown inFIG. 4, which are attached to the wire that lights the reverse lights. This in turn activates thecamera130 and its circuitry when the vehicle is placed in reverse.
• Referring now toFIG. 7B, a high level schematic of the electronic components and circuitry of thedisplay device200 is illustrated. The electrical components and circuitry of thedisplay device200 perform a number of functions, including without limitation, transforming the wireless image signal received from thecamera assembly100 into an image displayed on thedisplay screen207, powering thedisplay device200, and executing user commands inputted via the controls210-213.
• The wireless transmitted image signal is received by the receivingantenna746 and transmitted to thereceiver735. In the exemplified embodiment, the receiving antenna146 is tuned to 2.4 GHz. It should be understood that the receiving antenna146 may be tuned to whatever frequency at which the image signal is transmitted. If desired, the circuitry can be adapted to include a controller that automatically activates thedisplay device200 upon receipt and/or detection of a received image signal. Such automatic activation of thedisplay device200 eliminates the need for a separate action from the user, thereby ensuring that the area behind the vehicle is displayed on the display device at the necessary times.
• Still referring toFIG. 7B, thereceiver735 comprises a low noise amplifier (LNA)744, an 8 MHz crystal controlledoscillator738, a phase locked loop (PLL)740, amixer742 and anintermediate frequency amplifier728. TheLNA744 boosts the 2.4 GHz signal that is received via the receivingantenna746. The 8 MHz crystal controlled oscillator138 and thePLL140 generate a base frequency. Themixer742 is connected to theLNA744 and thePLL740. Themixer742 combines the received 2.4 GHz signal and the base frequency to create an intermediate frequency (IF) signal. The IF signal is transmitted to the intermediate frequency amplifier128 which increases the strength of the IF signal.
• The IF signal is then transmitted to avideo demodulator726. Thevideo demodulator726 strips away the IF and leaves only the image signal, which is then sent to anintegrated circuit732. In the exemplified embodiment, the integrated circuit132 is a thin film technology (TFT) driver circuit.
• The TFT driver circuit132 sets up and supplies the correct signals for thedisplay screen207. As discussed above, thedisplay screen207 shows the visual images associated with the image signals. The TFT driver circuit132 is connected to both thedisplay screen207 and the central processing unit (CPU)723. TheCPU723 controls the receiver functions, uses image enhancement software, enables image rotation and/or inversion, and provides color. TheCPU723 receives the signals generated from the operation of the controls210-213 of thedisplay device200 and performs the appropriate action. For example, when the brightness is adjusted, or the image angle is to be switched, theCPU723 receives the signal and acts upon it. Image rotation and inversion is provided so that in the event that thecamera assembly100 is mounted incorrectly, the image may be simply adjusted so that there is no need to remount thecamera assembly100.
• TheCPU723 is also connected to a switchingpower supply circuit736 which creating the +3.3V, the +5V, the +12V, and the +14V from the 12 DC voltage provided by the vehicle from theadapter400.
• Referring now toFIGS. 8A-8C concurrently, a schematic of thecircuit750 that is used for theimage sensor711 and its associated components is illustrated. As shown incircuit750, +12 Volt of direct current is applied through azener diode751 that provides reverse polarity voltage protection for thecamera130. The capacitors752-753 act as filters in thecircuit750. AMOSFET transistor754 and avoltage regulator755 form a current regulated +5 V DC regulator in thecircuit750. An inductor756 and capacitors757-758 filter the output that comes from the regulator formed byMOSFET transistor754 andregulator755. Resistors759-760 establish a voltage reference for theregulator755.
• A sensor circuit761 and its associated components convert the light passing through thecamera lens114 into electrical impulses and determine the automatic gain control (AGC) levels and the video sync frequency for either PAL or NTSC formats. In the instant invention, PAL is used, however it is to be understood that other acceptable formats may be used. The composite video output of the sensor761 is then fed to thetransmitter125.
• Referring now toFIGS. 9A-9D concurrently, a schematic of thecircuit770 that is used for thetransmitter125 and its associated components is illustrated. An image signal received from theimage sensor711 is shown on the far left side of thecircuit770. The composite image signal passes through a series of filters that are composed ofinductors771,capacitors773, andresistors772. These components operate together in order to form a bandpass filter that keeps unwanted frequencies from reaching the transmitter integratedcircuit775.
• Avoltage regulator776 and its associated components convert +5 VDC to +3.3 VDC for theintegrated transmitter circuit775. The transmitter.circuit775 is a 2.4 GHz audio/visual transmitter. In the embodiment shown inFIGS. 1,3a-3d,and4 only the visual section is used, however it is possible to utilize the audio section should one add a microphone to thecamera assembly100.
• The oscillator718 (FIG. 7A) is used by thetransmitter circuit775 to establish a frequency reference. This frequency is divided by the internal PLL716 (FIG. 7A) into one of four frequencies: 2.414 GHz, 2.432 GHz, 2.450 GHz, 2.468 GHz. Control of thePLL716 is determined by grounding combinations of inputs777 to thetransmitter circuit775.
• The 2.4 GHz RF output from thetransmitter circuit775 passes through low pass, and bandpass filters consisting of theinductors778, thecapacitors779, and a 3 pin Surface Acoustic Wave (SAW)filter780 to thetransmitter antenna153. Thetransmitter antenna153 is discussed in detail above with respect toFIG. 4. As mentioned above, thetransmitter antenna153 may be a simple wire placed inside and/or outside of thecamera housing111 or it can be a ½ wave dipole at the end of thecoaxial cable151 attached to thecamera assembly100 that permits thetransmitter antenna153 to be located inside the vehicle.
• Referring now toFIGS. 10A-10D concurrently, a diagram of acircuit500 for the 2.4 GHz receiver735 (FIG. 7B) and its associated components is illustrated. The 2.4 GHz RF signal is picked up by thereceiver antenna746, which may be a simple wire that is placed inside thehousing205 of thedisplay device200. Thetransistors511 and their associated components amplify the RF signal and feed it to thereceiver circuit515. Thereceiver circuit515 is an integrated circuit. Thereceiver circuit515 and its associated components form acomplete RF receiver735 in combination with thecrystal oscillator738, thePLL740, and theIF amplifier728, automatic gain control, and video outputs716. The input pins select one of four frequencies, whichever is the same frequency as that used by thetransmitter125. Avoltage regulator517 regulates +5 V DC to +3.3 V DC. Video output from thereceiver circuit515 is transmitted to the CPU723 (FIG. 7).
• Referring now toFIG. 11, a combinedcircuit600 for theCPU723, thedisplay screen207, and thepower supply circuit736 is illustrated. For ease of illustration, the values of the electrical components have been omitted. If desired, reference can be made to parent U.S. Non-Provisional application Ser. No. 11/567,504, filed Dec. 6, 2006, now U.S. Pat. No. 7,245,207, for these values. Generally, power for thedisplay device200 is applied through the same type of circuit that thetransmitter125 uses, plus additional regulators and a DC-to-DC converter provide all the necessary voltages for theCPU723, theTFT driver IC732, and thedisplay screen207. TheTFT driver IC732 is located in the upper left section of thecircuit600. Associated components provide power, brightness, contrast, and image rotate and inversion control functions to thedisplay screen207. TheCPU circuit610 is located in the upper right section of thecircuit600. It accepts the image signal from thereceiver735 and provides image processing and color balance. Thedisplay circuit611 is located in the top center of thecircuit600. It receives imaging data from thedisplay circuit611 of theCPU723, and control signals from thedriver circuit732. Thedisplay circuit611 turns the electrical impulses back into tiny pixels of light in the correct colors in order to recreate the image perceived by thecamera130.
• Referring now toFIGS. 12-17 concurrently, an alternative embodiment of acamera assembly100A that can be used in conjunction with thebackup.camera system1000 ofFIG. 1 is illustrated. Thecamera assembly100A can replace and/or supplement thecamera assembly100 in the system and/or retrofit kit of the present invention. Thecamera assembly100A is similar to thecamera assembly100 discussed above in relation toFIGS. 1-11 in many of its basic structural aspects and functioning. Thus the same reference characters will be used to identify like components of thecamera assembly100A with the addition of alphabetical suffix “A.” In order to avoid redundancy, only those aspects of thecamera assembly100A that differ fromcamera assembly100 will be discussed in detail below.
• Thecamera assembly100A is designed so that thecamera portion110A can be pivoted relative to thebase portion120A so that the viewing area of thelens114A can be adjusted as needed without having to remove thecamera assembly100A from a vehicle once it is mounted. Thecamera assembly100A also eliminates the need to use the positioners40 (FIG. 6).
• Referring now toFIGS. 12-13 concurrently, thecamera assembly100A generally comprises thebase portion120A and thecamera portion110A. Thehousing111 of thecamera portion110A is pivotally connected to thebase portion120A. In the exemplified embodiment, thehousing111 is pivotally connected to thebase portion120A via aratchet bar180A which provides an axis of rotation. Thebase portion120A comprises first andsecond pivot flanges181A-182A that extend outward from thefront surface183A of theelongated flanges121A. The pivot flanges181A-182A are spaced from one another so as to provide a space therebetween in which thecamera portion110A can be positioned.
• The pivot flanges181A-182A are adapted to receive and support theratchet bar180A in a manner that allows theratchet bar180A to pivot about its axis. In addition to providing a nesting area for theratchet bar180A, each of thepivot flanges181A-182A also forms a housing structure that accommodate one or more of the mechanisms discussed below, such as the roll-back bar and gearing. In order to eliminate thebase portion120A from impeding rotation of thecamera portion110A, the outer surface of therear wall116A is curved in a convex manner. In another embodiment, only the edges of therear wall116A may need to be beveled. In still other embodiments of the invention, if a sufficient clearance is provided between therear wall116A of thecamera portion110A and thebase portion120A, therear wall116A can be flat. Furthermore, while thepivot flanges181A-182A are illustrated as housing structures, in other embodiments, the pivot flanges may be simple plate-like or other structures that accommodate the ends of theratchet bar180A.
• Referring now toFIGS. 14-16, the internal rotation mechanisms of thecamera assembly100A are illustrated. The internal rotational mechanisms comprise theratchet bar180A, ananti-rollback mechanism183A, and aratchet member184A. These components co-operationally work with one another to facilitate the pivoting, locking and unlocking of thecamera portion110A with respect to thebase portion120A.
• Theratchet bar180A extends through holed in thehousing111A of thecamera portion110A, which is rigidly attached thereto. Theratchet bar180A is positioned within thepivot flanges181A-182A so as to be capable of being rotated about its axis. Connected near one end of theratchet bar180A is theratchet member184A. Theratchet member184A comprises tooth-like protrusions that co-operationally engage with theanti-rollback mechanism183A. The interaction between theratchet member184A and theanti-rollback member183A permit the ratcheting of thecamera portion110A about theratchet bar180A and can lock and unlock thecamera portion110A in a desired pivoting position.
• Anend cap185A is connected to the other end of theratchet bar180A and is accessible from outside of thepivot flange housings181A-182A. Theend cap185A is operably coupled to the internal mechanisms so that depressing theend cap185A releases theanti-rollback mechanism183A, thereby unlocking theratchet bar180A and allowing the user to pivot thecamera portion110A to the desired orientation. When the end cap is not depressed, theanti-rollback mechanism183A prohibits theratchet bar180A from pivoting.
• It is to be understood that the aforementioned positioning of the various parts of the ratcheting mechanism may be altered depending on the specifics of the camera assembly and are in no way limiting of the present invention. In simplified embodiments of thecamera assembly100A, internal rotational mechanisms may be absent and thecamera portion110A may be pivotally mounted to thebase portion120A via a simple axle arrangement.
• Referring now toFIG. 17, the rotation of thecamera portion110A of thecamera assembly100A with respect to thebase portion120A when mounted on arear portion90 of a vehicle will be discussed. The mounting procedure discussed above with respect toFIG. 6 is generally applicable to the mounting ofcamera assembly100A except that thepositioners40 are not used.
• Thecamera assembly100A is, mounted over thelicense plate50 using the license plate mounting holes via theelongated flanges121A. Thebase portion120A is rigidly mounted to therear portion90 of the vehicle. However, because thecamera portion110A is pivotally mounted to thebase potion120A as described above, thecamera portion110A can rotate about an axis, which in the illustration would be the z-axis (which is visible only as a point Z). As a result, the vertical direction in which thelens114 is directed can be rotated about the z-axis at an angle β. This allows the user to orient thecamera portion110A so that its viewing area is directed downward, upward or even with the horizon (which is defined by the plane formed by the x-axis and the z-axis). This adjustment can be achieved without removing thecamera assembly100A from the vehicle once it is mounted. The angle β may be between 0 and 180°, however it is preferred that angle β be between 0 and 90°.
• The axis about which thecamera portion110A can pivot (which is the z-axis in the illustration) is preferably substantially horizontal and runs substantially parallel to a flat surface on which the vehicle is located. While thecamera portion110A can only rotate about the z-axis in the exemplified embodiment, the invention is not so limited. In other embodiments, thecamera portion110A may be pivotally mounted to thebase portion120A so as to be able to rotate in a variety of directions with increased degrees of freedom. For example, a ball joint can be used as the pivot connection.
• Furthermore, in embodiments of thebackup camera system1000 where an adjustable camera assembly (such ascamera assembly100A) is used, the rotation/pivoting of the camera portion may be controlled by the operator within the vehicle without having to manually pivot the camera portion. This can be achieved by including servo-motors in thecamera assembly100A that are operable from within the vehicle. In such an embodiment, it may be possible to adapt the view adjustbutton212 of thedisplay device200 to control the servo-motors.
• Referring now toFIGS. 18-19, a second alternative embodiment of anadjustable camera assembly100B is illustrated. Thecamera assembly100B can replace and/or supplement thecamera assemblies100,100A in the system and/or retrofit kit of the present invention. Thecamera assembly100B is similar to thecamera assemblies100,100A discussed above in relation in many of its basic structural aspects and functioning. Thus the same reference characters will be used to identify like components of thecamera assembly100B with the addition of alphabetical suffix “B.” In order to avoid redundancy, only those aspects of thecamera assembly100B that differ fromcamera assemblies100,100A will be discussed in detail below.
• As with thecamera assembly100A, thecamera assembly100B is designed so that thecamera portion110B can be pivoted relative to thebase portion120B so that the viewing area of thelens114B can be adjusted as needed without having to remove thecamera assembly100B from a vehicle once it is mounted.
• Incamera assembly100B, thehousing111B of thecamera portion110B is pivotally mounted to thebase portion120B so that thefront wall113B of thehousing34 is substantially flush with a front surface of theelongated flanges121B. The rear wall116B of thehousing111B has a rounded surface that permits thehousing111B in an unimpeded manner despite the existence of a very minimal clearance.
• An internal rotational mechanism, such as that discussed above with respect tocamera assembly100A, is used. However, as opposed to having some of the components of the internal rotational mechanism placed within the housing formed by the pivot flanges, the components of the internal rotational mechanism are placed within cavities formed within theelongated flanges121B themselves. Thus, theelongated flanges121B act as the pivot flanges in this emboidment. The placement of the internal rotational mechanism within theelongated flanges38 and within thehousing111B permits thecamera assembly100B to have a low profile.
• Referring now toFIGS. 21, an alternative embodiment of amulti-input display device200A that can be used in conjunction with thebackup camera system1000 ofFIG. 1 is illustrated. Thedisplay device200A can replace and/or supplement thedisplay device200 in the system and/or retrofit kit of the present invention. Thedisplay device200A is similar to thedisplay device200 discussed above in relation toFIGS. 1-11 in many of its basic structural aspects, functioning and interaction with the other components of thebackup camera system1000. Thus the same reference characters will be used to identify like components of thedisplay device200A with the addition of alphabetical suffix “A.” In order to avoid redundancy, only those aspects of thedisplay device200A that differ from thedisplay device200 will be discussed in detail below.
• Thedisplay device200A comprises avideo input port270A and amanual switch275A provided on the front surface of thedisplay housing205A. Thevideo input port270A and themanual switch275A are operably connected to the internal circuitry of thedisplay device200A, as will be described later in relation toFIG. 21. Thevideo input port270A is adapted to accommodate a first plug end of a video cable that is operably connected to an external video player990 (FIG. 21) at the other end. Thevideo input port270A can receive video signals from theexternal video player990 for reproduction on thedisplay screen207A. If desired, thevideo input port270A can also be adapted to operate as means for charging theexternal video player990. Thevideo input port270A can be any type of port that can be used to operably couple an external device, including without limitation a USB port, a standard jack port, a firewire port, an AN port, a second RF receiver, etc.
• Themanual switch275A is operably connected to aswitching circuit970A (FIG. 21) that controls whether the image signal displayed on thedisplay screen207A is based on the signal received from via thevideo input port270A or thereceiver735A (FIG. 21). Stated another way, the switchingcircuit970A is used to select between designating thevideo input port270A or thereceiver735A as the image signal source for visual display on thedisplay device200A. Of course, additional video sources can be incorporated into thedisplay device200A. In the exemplified embodiment, theswitch275A is a physical switch. However, theswitch275A can be an electronic switch such as a touch button on a thedisplay screen207A, a voice recognition circuit, a touch wheel, a button, etc. Furthermore, in other embodiments of thedisplay device200A, the switchingcircuit970A itself may be adapted to automatically select and/or switch the signal source upon detection of an event, thereby eliminating the need for aphysical switch275A.
• Referring now toFIG. 21, a high level circuit schematic of thedisplay device200A is illustrated. In utilizing themulti-input display device200A, avideo player990 is operably coupled to thevideo input port275A via a video cable. Thevideo player990 may be any type of video player, portable or installed in the vehicle, such as a DVD player or a video iPod®. It is intended that thevideo player990 may be capable of reproducing and transmitting any type of video format such as MPEG-4, AVI, WMV-9, and DRM. It is further anticipated that additional formats may be employed as well.
• As with thedisplay device200 discussed earlier, themulti-input display device200A has a receiver circuit725 that is capable of receiving a wireless signal transmitted from a second image signal source, such as thecamera assembly100. Both thevideo input port275A and thereceiver circuit735A are operably coupled to theimage signal switch970A. The imagesignal switch circuit970A is operably connected to and controlled by themanual switch275A.
• The image signal switch170 is operably coupled to theCPU723A which performs the necessary image processing required to provide the image signals to thedisplay screen207A for visual display. The imagesignal switch circuit970A selects whether the visual display in thedisplay screen207A is based on the image signal received from thevideo input port275A. Stated another way, depending on the position of theswitch275A, the imagesignal switch circuit970A selects either the image signal from thevideo input port275A or the image signal from thereceiver735A to transmit to thedisplay screen207A.
• While the imagesignal switch circuit970A is exemplified as being controlled by themanual switch275A, theimage signal switch970A may be designed to perform an automatic switching/selection upon the occurrence and/or detection of a certain event. For example, theimage signal switch970A can automatically select transmission of the image signal from thevideo input port275A to thedisplay screen207A upon a jack being inserted into thevideo input port275A or upon detecting an incoming video signal from thevideo input port275A. If desired, thereceiver735A can be deactivated when not selected as the signal source.
• Utilizing this automatic switching arrangement for safety reasons, theimage signal switch970A can be operated by theCPU723A so as to automatically switch/select transmission of the image signal received from thecamera assembly100 when the corresponding image signal is received at thereceiver735A. This can occur, for example, when thecamera assembly100 andtransmitter125 are activated, such as when the vehicle is placed in reverse.
• Referring now toFIG. 22, an embodiment of thedisplay device200A wherein itsimage signal switch970A (and corresponding circuitry) is adapted to select between processing one of a plurality of wireless signals for transmission to thedisplay device207A is illustrated.
• In some embodiments, the image signal from thevideo player990A will be wireless, such as when thevideo player990A is connected directly to avideo modulator985A. Alternatively, thevideo player990A may contain an internal transmitter that enables direct transmission of video signals to thedisplay device200A.
• Still referring toFIG. 22, thevideo player990A transmits the video signal to thevideo modulator985A via a video cable. In other embodiments, the video signal may be transmitted through a USB port, or other compatible port such as a IEEE 1394 port (i.e. a firewire port). Thevideo modulator985A may also act as an inverter and operate to recharge thevideo player990A and/or supply power to it. Thevideo modulator985A may be plugged into a vehicle's 12 V socket and/or operate on batteries.
• Thevideo modulator985A has amicroprocessor987A that processes the image signals that are received from thevideo player990A. Themicroprocessor987A processes the incoming image signals so that they can be transmitted to thedisplay device200A. After thevideo modulator985A processes the image signals, they are transmitted to themodulator transmitter986A, where they are converted into wireless signals that are transmitted to thedisplay device200A at a predetermined frequency which thereceiver735A of thedisplay device200A is enabled to receive.
• In the event that avideo player990A is wirelessly transmitting its images through thevideo modulator985A, theimage signal switch970A can be adapted to detect the frequency of the incoming wireless signal received by thereceiver735A. By detecting the frequency of the incoming image signal, theimage signal switch970A can give priority (i.e., select for transmission) the image signal having a desired/pre-selected frequency. For example, theimage signal switch970A can give priority to an incoming wireless image signal transmitted at the frequency at which the transmitter of thecamera100 transmits. Alternatively, the image signal from thecamera100 may contain data that instructs theCPU723A to activate theswitch970A.
• Referring now toFIGS. 23-24 concurrently, an alternative embodiment of abackup camera system1000C is illustrated. Thebackup camera system1000C comprises acamera assembly100C, adisplay device200A, and avideo cable870C. Thebackup camera system1000C, and its components, are similar to thebackup camera system1000, and the components, discussed above in many aspects. However, thebackup camera system1000C is designed to facilitate both wired and wireless image signal transmission from thecamera component100C to thedisplay device200A. Thedisplay device200A is described above with respect toFIGS. 20-22. Thevideo cable870C can be any type of cable capable of transmitting video signals, including without limitation a coaxial cable, a DSL cable, a phone cable, a USB cable, an AN cable, etc. The ends of thevideo cable870C are adapted for operable insertion into and cooperation with the video out putport889C of thecamera assembly100C and thevideo input port270A of thedisplay device200A. As such, the ends871C-872C of thevideo cable870C can be any type of adapter components, such as a USB jack, an AN jack, a phone jack, a banana plug, etc.
• Thecamera assembly100C is specifically designed to utilize the multi-input capabilities of thedisplay device200A so that a user can choose whether thecamera assembly100C is to transmit the image signal to thedisplay device100C wirelessly or through a hard-wire connection. When sold as a retrofit kit, thebackup camera system1000C is especially useful in that a single kit can be used to afford viewing capabilities to a wide range of vehicles.
• Extending from the rear of thecamera assembly100C arepower supply wires140C and a combinedwire assembly888C. The combinedwire assembly888C comprises an external antenna cable115C identical to the one described above with respect to theFIG. 4. The combinedwire assembly888C also comprises avideo signal wire877C that is operably coupled to the internal circuitry of thecamera assembly100C at one end and has thevideo output port889C at the other end. Thevideo output port889C can be any type of port, including a USB port, a phone jack, a standard AN port, etc. In the exemplified embodiment, the video out putport889C is a 3.5 mm, 4 pole jack that is located within the interior of the vehicle when thecamera assembly100C is mounted top the vehicle. If desired thepower supply wires140C can be incorporated into the sameheat shrink tubing160C which surrounds theexternal antenna cable150C and thevideo signal wire877C, as is schematically shown inFIG. 24 and described with respect toFIG. 4 above.
• Thedisplay device200A functions as discussed above inFIGS. 21-22, including the functions associated with theswitching circuit970A. The internal circuitry of thecamera assembly100C is designed to perform a similar switching function with respect to transmission of the image signal.
• Thecamera assembly100C comprises an imagesignal switch circuit878C operably coupled to theimage signal processor722C, thetransmitter125C and thevideo output port877C. The imagesignal switching circuit878C receives the image signal (which corresponds to the perceived image) from theimage signal processor722C. The imagesignal switching circuit878C selects whether the image signal will be transmitted to thetransmitter125C for wireless transmission to thedisplay device200A or to thevideo output port889C for hard-wired transmission to thedisplay device200A. As with the switching circuit of thedisplay device200A discussed above, the selection by the imagesignal switching circuit878C can be dictated by a manual switch or can be automated.
• In a manual switch embodiment, depending on the position of the switch, the imagesignal switching circuit878C either transmits the image signal to thevideo output port889C or to thetransmitter125C. In an automated embodiment, the selection of the imagesignal switching circuit878C is dictated by the occurrence and/or detection of a certain event. For example, the imagesignal switching circuit878C can automatically select transmission of the image signal to thevideo output port889C upon theplug871C of thevideo cable870C being inserted into thevideo output port889C. If desired, thetransmitter125C can be deactivated when not selected as the transmission source.
• When thevideo cable870C is inserted into both thedisplay device200A and thevideo output port889C, thecamera assembly100C may then send both power and the video signal to thedisplay device200A.
• It is to be understood, however, that even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and function of the invention, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed. Any of the components of the backup camera system, and respective functional capabilities, can be mixed and matched as desired to create the most desirable backup camera system and/or retrofit kit.

Claims (27)

1. A system for monitoring an area around a vehicle comprising:

a camera assembly comprising: (i) a camera adapted to produce an image signal corresponding to a perceived image, (ii) means for supplying power; (iii) a base having first and second holes that are configured and spaced from one another so as to facilitate attachment to the vehicle using the vehicle's license plate mounting bolts, (iv) a transmitter operably coupled to the camera for wirelessly transmitting the image signal;

a display device comprising: (i) a receiver for receiving the wirelessly transmitted image signal, (ii) means for supplying power, (iii) an image processing unit operably coupled to the receiver for converting the received image signal into a display image that is displayed on the display device, the display image corresponding to the perceived image; and

a stand adapted to support the display device;.

2. The system ofclaim 1 wherein the stand comprises a sleeve-like structure having an open top end for slidably receiving the display device.

3. The system ofclaim 1 wherein the stand comprises a base structure and a support structure adapted to support the display device, the support structure pivotally connected to the base structure.

4. The system ofclaim 1 further comprising means for securing the stand to a surface within a passenger compartment of the vehicle.

5. The system ofclaim 1 further comprising:

the stand comprising a sleeve-like structure having a front wall, a rear wall and a cavity between the front wall and the rear wall;

the sleeve like structure having an open top end forming a passageway into the cavity, the passageway dimensioned so that the display device can be slidably inserted into the cavity through the passageway; and

a cutout in the front wall, the cutout dimensioned and configured to allow unobstructed viewing of a display screen of the display device when the display device is positioned in the cavity and supported by the sleeve-like structure.

6. The system ofclaim 5 further comprising means for securing the display device within the cavity.

7. The system ofclaim 1 wherein the camera is pivotally connected to the base.

8. The system ofclaim 7 wherein the camera is pivotally connected to the base so as to pivot solely about a substantially horizontal axis when the base is mounted to the vehicle using the vehicle's license plate mounting bolts.

9. The system ofclaim 1 wherein the base comprises an elongated plate extending from a first end to a second end, the camera pivotally connected to the base so as to be substantially equidistant from the first and second ends of the elongated plate, the elongated plate comprising the first and second holes.

10. The system ofclaim 1 further comprising:

an antenna operably connected to the transmitter, the antenna extending from the camera assembly; and

wherein the antenna is dimensioned so that when the camera assembly is mounted to the vehicle using the vehicle's license plate mounting bolts, the antenna can extend into a passenger compartment of the vehicle.

11. The system ofclaim 1 wherein the camera assembly comprises a first housing having a front wall, the camera located within the first housing so that a lens of the camera extends through the front wall of the first housing, and wherein the first housing forms a hermetically sealed space filled with an inert gas for preventing condensation on the lens of the camera.

12. The system ofclaim 11 wherein the transmitter is located in a second housing and operably coupled to the camera via a flexible cable extending from the first housing; and the flexible cable dimensioned so that when the camera assembly is mounted to the vehicle using the vehicle's license plate mounting bolts, the second housing can be positioned within a passenger compartment of the vehicle.

13. The system ofclaim 1 further comprising:

the display device comprising a video input port operably coupled to the image processor; and

a switching circuit for selecting whether the display image is based on the received image signal from the receiver or a video signal from the video input port.

14. The system ofclaim 1 wherein the power supply means of the display device is a cigarette-lighter plug.

15. The system ofclaim 1 wherein the image processing unit is capable of manipulating the received image signal to an upside-down orientation.

16. The system ofclaim 1 further comprising:

the stand comprising a base structure and a support structure adapted to support the display device, the support structure pivotally connected to the base structure; and

means located on a bottom surface of the base structure for securing the stand to a surface within a passenger compartment of the vehicle.

17. The system ofclaim 16 further comprising means for securing the display device to the support structure.

18. The system ofclaim 1 wherein the camera comprises a hermetically sealed space filled with an inert gas for preventing condensation on a lens of the camera.

19. The system ofclaim 1 wherein the display device is activated upon receiving an image signal from the transmitter.

20. The system of claim I wherein the image processing unit is capable of manipulating the received image signal so that the display image is an inverted version of the perceived image.

21. The system ofclaim 1 further comprising:

the stand comprising a base structure and a support structure adapted to support the display device, the support structure pivotally connected to the base structure;

means for securing the stand to a surface within a passenger compartment of the vehicle;

the camera being pivotally connected to the base so as to pivot solely about a substantially horizontal axis when the base is mounted to the vehicle using the vehicle's license plate mounting bolts;

the base comprising an elongated plate extending from a first end to a second end, the camera pivotally connected to the base so as to be substantially equidistant from the first and second ends of the elongated plate, the elongated plate comprising the first and second holes;

the display device comprising a video input port operably coupled to the image processor; and

wherein the power supply means of the display device is a cigarette-lighter plug and the power supply means of the camera assembly is a pair of wires dimensioned so that when the camera assembly is mounted to the vehicle using the vehicle's license plate mounting bolts, the wires can be extended into a passenger compartment of the vehicle.

22. The system ofclaim 1 further comprising:

the camera assembly, the display device and the stand forming a retrofit kit;

the stand comprising a base structure and a support structure adapted to support the display device, the support structure pivotally connected to the base structure;

means for securing the stand to a surface within a passenger compartment of the vehicle;

the camera being pivotally connected to the base so as to pivot solely about a substantially horizontal axis when the base is mounted to the vehicle using the vehicle's license plate mounting bolts;

the base comprising an elongated plate extending from a first end to a second end, the camera pivotally connected to the base so as to be substantially equidistant from the first and second ends of the elongated plate, the elongated plate comprising the first and second holes;

the display device comprising a video input port operably coupled to the image processor; and

wherein the power supply means of the display device is a cigarette-lighter plug and the power supply means of the camera assembly is a pair of wires dimensioned so that when the camera assembly is mounted to the vehicle using the vehicle's license plate mounting bolts, the wires can be extended into a passenger compartment of the vehicle.

23. A system for monitoring an area around a vehicle comprising:

a camera assembly comprising: (i) a camera adapted to produce an image signal corresponding to a perceived image, (ii) means for supplying power; (iii) a base configured to facilitate attachment to an exterior surface of the vehicle, (iv) a transmitter operably coupled to the camera for wirelessly transmitting the image signal;

a display device comprising: (i) a receiver for receiving the wirelessly transmitted image signal, (ii) means for supplying power, (iii) an image processing unit operably coupled to the receiver for converting the received image signal into a display image that is displayed on the display device, the display image corresponding to the perceived image; and

a stand comprising: (i) a base structure, (ii) a support structure adapted to support the display device, the support structure pivotally connected to the base structure, and (iii) means located on a bottom surface of the base structure for securing the stand to a surface within a passenger compartment of the vehicle.

24. The system ofclaim 23 wherein the camera assembly, the display device and the stand form a retrofit kit.

25. A system for monitoring an area around a vehicle comprising:

a camera assembly comprising: (i) a camera adapted'to produce an image signal corresponding to a perceived image, (ii) means for supplying power; (iii) a base configured to facilitate attachment to an exterior surface of the vehicle, (iv) a transmitter operably coupled to the camera for wirelessly transmitting the image signal;

a display device comprising: (i) a receiver for receiving the wirelessly transmitted image signal, (ii) means for supplying power, (iii) an image processing unit operably coupled to the receiver for converting the received image signal into a display image that is displayed on the display device, the display image corresponding to the perceived image; (iv) a video input port operably coupled to the image processor, and (v) a switching circuit for selecting whether the display image is based on the received image signal from the receiver or based on a video signal from the video input port; and

a stand for supporting the display device.

26. The system ofclaim 25 wherein the stand comprises: (i) a base structure, (ii) a support structure adapted to support the display device, the support structure pivotally connected to the base structure, and (iii) means located on a bottom surface of the base structure for securing the stand to a surface within a passenger compartment of the vehicle.

27. The system ofclaim 25 wherein the camera assembly, the display device and the stand form a retrofit kit.

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