CN101451888A - Resin forming optical lens - Google Patents

Abstract

The present invention relates to a resin molded optical lens. The infrared ray for detecting object surface is assembled on a lens support section of the optical lens composed of resin and shaped size of the lens section, the shape and size of the lens section are limited in design because alive condition of such as injection molding. Resin molded product independently separated as infrared ray assembling lens section configured upper side and a support section mounted onto the an electrothermic detector is formed, the light assembling lens section and the support section are integrated into the optical lens after ultrasonic deposition. Further, according to the construction design of the infrared ray detection device, the upper side light assembling lens is changed, adjusted to be various lens having various infrared ray detection zones, thereby easily selecting separation or division of the infrared ray zones.

Description

Resin forming optical lens

Technical field

The present invention relates to carry on human body detection device current pyroelectric infrared detecting device had will converge to the resin forming optical lens of infrared ray photo detector from the infrared ray of human body.

Background technology

Used current pyroelectric infrared detecting device with the infra-red ray detection device as purpose such as human detection, by the optical lens that converges on the infrared ray photo detector that is configured in current pyroelectric infrared detecting device inside from the infra-red-emitting in the detected object zone will be provided with, will have constructed thus the infrared detection zone that has after design is divided in the focal position mode consistent with above-mentioned current pyroelectric infrared detecting device.The general resin material that constitutes by the infrared transmitting material that uses of above-mentioned optical lens, when for example the detected object face of certain limit being divided into a plurality of infrared detection zone, constitute the many assembly types lens with the intensive setting of lenslet part of convex body or Fresnel shape body, the profile of above-mentioned optical lens portion is used thin-walled spherical shape or aspherical shape mostly.

Here, the optical lens 3a that current pyroelectric infrared detecting device had, as collector lens shown in Figure 10 considered with the focal length of above-mentioned infraredray photo detector 4 relation after carried out optical design, in order to be arranged on the position that obtains best infrared ray optically focused, be fixed on thecircuit board 6 with above-mentioned current pyroelectric infrared detecting device 5.Fig. 9 represents the side synoptic diagram of the infra-red ray detection device shown in the decomposition appearance figure of Figure 10, expression with infraredray photo detector 4 be starting point to each collector lens A, B, C ... focus between apart from being the infra-red ray detection device of F.

And, exist the circuit on the circuit board to connect in the drawings with wiring and installation electronic unit etc., but in order not make figure save diagram in a jumble.

In addition, as described in Japanese kokai publication hei 8-313339 number and TOHKEMY 2001-304956 number, be directly installed on the infrared detector optical lens and the fixing method of supporting in order to suppress the optically focused light shaft offset and to avoid, also having popularized by resulting from rocking the detection deviation that causes and preventing maloperation of detecting device wind on every side.

Patent documentation 1: Japanese kokai publication hei 8-313339 number

Patent documentation 2: TOHKEMY 2001-304956 number

The problem to be solved in the present invention point is: direct installation for example shown in Figure 8 is supported on the optical lens 3b on the current pyroelectricinfrared detecting device 5, be as the injection-molded article that constitutes by the good high-density polyethylene material of infrared transmitting etc. and withlens section 1 andsupport portion 2 type that forms as one in the past, but reason because of on the structure of injecting molding die and moulding establishment condition aspect, for the maximum physical dimension that is installed to thesupport portion 2 on the current pyroelectric infrared detecting device, thecollector lens portion 1 maximum physical dimension that is arranged in upside is to be difficult to realize greater than the structure of support portion in injection molding one-piece type formation.

Therefore, occasion at the infra-red ray detection device of the optical lens of constructing the intensive configuration of a plurality of lenslet part (the many assembly types collector lens that constitutes by convex body or Fresnel shape body) with the infrared detection zone that for example will segment the detected object face, generally to keep the purpose of infrared detection performance, need enlarge and above-mentionedly dispose a plurality of lenslet part areas and accept the infrared ray amount in detected object zone more, produce following problems thus: for example when carrying the current pyroelectric infrared detecting device of use TO-5 type, must adopt the shape of the optical lens portion self that is constituted, size is greater than the design of the Package size of detecting device shell.In other words, the size that this means the fixed support portion of optical lens in one-piece type injection moulding is peripheral greater than predetermined current pyroelectric infrared detecting device packing of carrying, and is difficult to be shaped to lens support and can directly remains on mounting structure on the current pyroelectric infrared detecting device.This has hindered application and the importing that directly is installed to the simplification assembling procedure of current pyroelectric infrared detecting device as optical lens in the method that is installed in infra-red ray detection device, must have on the circuit board face as a result with the space of optical lens portion same size and as the fixed area of above-mentioned optical lens.

Summary of the invention

The present invention is in order to solve above-mentioned problem, asscheme 1, it is characterized in that, with the upper side lens section of the resin forming optical lens of one-piece type injection-molded article and the synthetic resin that the lower side fixed support portion is made disome in the past, make collector lens portion that is configured in the diversified infrared detection of having of upper side zone and the support portion that directly installs and fixes on the current pyroelectric infrared detecting device that is configured in lower side distinguish independent separate, cooperate above-mentioned collector lens portion and support portion, on the auxiliary section, implement the rib moulding in advance, use ultrasonic wave coating method fusing rib thus and make the top and the bottom mechanical connection, thereby constitute incorporate optical lens.

Scheme 2 is in thescheme 1 described optical lens that forms as the many assembly types collector lens that has disposed a plurality of above-mentioned upper side collector lens portion, it is characterized in that, have and the installation direction to the electrothermic type infrared detector can be arranged on first strong point of infrared ray photo detector coaxial direction configuration and rotate structure on these 2 directions of second strong point of directions configuration of 45 degree at axle, and be the structure that the projection of shape in infrared detection zone can be selected.

The present invention has following effect.

According to resin forming optical lens of the present invention, asscheme 1, the optical lens structure of the limited geomery in realization aspect of the moulding of integral structure in the injection moulding is formed upper side collector lens portion and lower side support portion independent separate, the collector lens portion that is configured in upper side that will constitute with the size that is difficult in the integral structure realize and shape, be coupled on the lower side support portion with the structure that can be directly installed on the current pyroelectric infrared detecting device, carry out ultrasonic wave coating then, can form the integral structure of mechanical connection simply thus.

Make collector lens portion and the incorporate optical lens in support portion because can utilize the ultrasonic wave coating method, even so in the past because of the fixing injection moulding optical lens that can only be arranged on the size that could constitute on the circuit board of the big lens of lens section shape, if use the structure of collector lens portion and support portion independent separate, just can realize installing the simplification of the assembling procedure of the area reduction of mounted board portion and infra-red ray detection device.And, optical lens directly can be installed on the current pyroelectric infrared detecting device and fix, the offset of the optically focused optical axis of lens and infrared ray photo detector is difficult to take place thus, the infra-red ray detection device that optical position is suitable and have stable infrared detection performance can also reduce the optically focused loss, so can be provided.

Asscheme 2, inscheme 1 described optical lens, optical lens can be selected on 2 directions to the strong point of the installation direction of electrothermic type infrared detector, can cut apart, divide the infrared detection zone that forms two types so use a plurality of Splittable optical lenses of a type, help the design of constructing of infra-red ray detection devices such as human detection, can provide the scheme of design alternative degree of freedom.

And, inscheme 1 or 2 described optical lenses, upper side collector lens portion forms various collector lens portion, described various collector lens portion have simple eye type that constitutes by convex body or Fresnel shape body or many assembly types of having arranged a plurality of lens sections carrying out the lenslet part of various arrangements, and be shaped to thin-walled dome shape or aspherical shape and cut apart and be divided into diversified infrared detection zone; Respectively with the current pyroelectric infrared detecting device package shape that is suitable for being carried can be shared the combination of lower side support portion, constitute incorporate optical lens with deposited joint, multiple class, cheapness and small-sized product can be provided thus.And, even consider the forming surface of upper side collector lens portion,, compare with the situation of moulding integral structure optical lens in the past by using common lower side support portion, investment can be reduced, and cheap lens section can be made.In addition, even in the constructing of infra-red ray detection device, produced the situation of the size-constrained system that design initial considers, if upper side collector lens portion selects suitable lens according to required specification and carries with integrated optical lens structure, can save also then that discussion is newly appended in the change in circuit board lateral area space and the specification change of current pyroelectric infrared detecting device etc., only can propose just can corresponding organization plan by the replacing of lens section, so help the control of design charges.

In the present embodiment of the following stated, optical lens with the lower side support portion of the shared planform that is fit to be installed to the current pyroelectric infrared detecting device Package size of TO-5 type is an example, but can only upper side collector lens portion be made into simple eye type Fresnel shape thin-walled lens, perhaps dispose many assembly types spherical shape lens that a plurality of lenslets that are made of biconvex shape body or single convex form body partly constitute, perhaps form the aspheric surface type lens of plane Fresnel shape thin-walled lens, and various lens and combination of lower side support portion and the integrated lens arrangement of deposited back formation.In addition, also can form the deposited one-piece type optics lens of lower side support portion with the various Package sizes that are suitable for flat pack type that for example 12.5mm is square and current pyroelectric infrared detecting device of TO-18 type etc.

Description of drawings

Fig. 1 is the three-dimensional decomposition appearance figure that expression has the infra-red ray detection device of the resin forming optical lens that relates to the embodiment of theinvention 1.

Fig. 2 is the side perspective synoptic diagram that expression has the infra-red ray detection device of the resin forming optical lens that relates to the embodiment of theinvention 1.

Fig. 3 is the top perspective synoptic diagram that expression has the infra-red ray detection device of the resin forming optical lens that relates to the embodiment of theinvention 1.

Fig. 4 is the figure in infrared detection zone that expression has the infra-red ray detection device of the resin forming optical lens that relates to the embodiment of theinvention 1.

Fig. 5 is the top perspective synoptic diagram that expression has the infra-red ray detection device of the resin forming optical lens that relates to the embodiment of theinvention 2.

Fig. 6 is the figure in infrared detection zone that expression has the infra-red ray detection device of the resin forming optical lens that relates to the embodiment of theinvention 2.

Fig. 7 is the figure in infrared detection zone that expression has the infra-red ray detection device of the resin forming optical lens that relates to the embodiment of theinvention 3.

Fig. 8 is the side perspective synoptic diagram that resin forming optical lens in the past is installed to the infra-red ray detection device on the current pyroelectric infrared detecting device.

Fig. 9 is the side perspective synoptic diagram that has carried the infra-red ray detection device of resin forming optical lens in the past.

Figure 10 is the three-dimensional decomposition appearance figure that has carried the infra-red ray detection device of resin forming optical lens in the past.

Among the figure:

1-upper side collector lens portion, 2-lower side support portion, 3a, 3b-resin forming optical lens, 4-infrared ray photo detector, the current pyroelectric infrared detecting device of 5-, 6-circuit board, 7-detecting device shell, 8-detecting device TAB, 9-lens support inner face side suppressing portion, 10-first strong point, 11-second strong point, 12-cooperates ditch, 13-auxiliary section, the deposited rib of using of 14-, the identification of 15-direction rib, A-first collector lens, B-second collector lens, C-the 3rd collector lens, F-focal length.

Embodiment

As independent separate is to make infrared ray collector lens portion that assembles and the optical lens that is installed to the support portion on the current pyroelectric infrared detecting device, Fig. 1 represents the stereo directional decomposition appearance figure, and Fig. 2 represents that the integrated optical lens that will form behind above-mentioned collector lens portion and the support portion ultrasonic wave coating is installed to the side structure synoptic diagram of the state on the current pyroelectric infrared detecting device.The optical lens of installing in Fig. 3presentation graphs 2 and the top structural outline figure of current pyroelectric infrared detecting device.

Embodiment 1

At first with reference to Fig. 1 and Fig. 2, detailed description relates to resin forming optical lens of the present invention.Inpresent embodiment 1, be example with the optical lens on the current pyroelectric infrared detecting device that can be installed to the TO-5 type.Thecollector lens 1 that is arranged on upper side is to be the thin-walled spherical lens that each lens sections of 9 parts is made of Fresnel shape body with the infrared detection area dividing, the focal length relation of each lens and infraredray photo detector 4 remains on 6.5mm ± 0.2mm, and the lens spherical radius is designed to 6.7mm ± 0.2mm.Be installed to the lowerside support portion 2 on the current pyroelectricinfrared detecting device 5 of TO-5 type, detectingdevice shell 7 tops and detecting device TAB8 become the installation inhibition point, carried out thestrong point 10,11 at two places of Punching Technology along detecting device TAB8 by the suppressingportion 9 that is positioned at above-mentionedsupport portion 2 inner face side with in bottom surface sections, formed as the cylindrical tube shape that carries out with the structure of the optically focused optical axis alignment of current pyroelectric infrared detecting device 5.Here, the maximum Outside Dimensions of upper sidecollector lens portion 1 is diameter 12.8mm, and the maximum gauge of lowerside support portion 2 is 10.2mm.

In addition, on 1 of collector lens, be provided with the Fresnel shape lenslet part of thin-walled, but, saved diagram in order not make figure mixed and disorderly.

Top surface side in above-mentioned lower side support portion is provided with and cooperates ditch 12, and theauxiliary section 13 that is positioned at above-mentioned upper side collector lens portion bottom surface side is with after ditch 12 engages, the maintenance that temporarily is fixed of lens section and support portion.And, on ditch 12 parts, implemented therib 14 of resin protuberance, make it deposited thisrib 14 usefulness ultrasound waves fusing, thereby top and the bottom are mechanically engaged and form the optical lens of integral structure.Here, the intensity that engages melt-coating part is next deposited with the condition that keeps minimum tensile strength 5kgf/ square centimeter, is difficult to separate upper side lens section and lower side support portion ground and carries out mechanical connection.In addition, the lens material has been used widely used in the past high-density polyethylene material.

Be positioned at the detecting device installation direction regulation strong point the 10, the 11st on the bottom surface sections of lower side support portion, implemented the structure of two place's Punching Technology.The position relation at this two place is on the basal surface position that has rotated 45 degree relative to 10 of first strong points as regular benchmark second strong point 11 to be set.And, at first strong point, 10upsides rib 15 is set, make the structure of identification first strong point and second strong point.Fig. 3 represents lowerside support portion 2 is installed on the current pyroelectric infrared detecting device, is each nine collector lens position relation that relative infraredray photo detector 4 is arranged on firststrong point 10 occasion on the coaxial cable to making as firststrong point 10 of the regular benchmark direction consistent with detecting device TAB8.

The occasion that has installed on the above-mentioned infraredray photo detector 4 that Fig. 4 represents to be provided with current pyroelectric infrared detectingdevice 5 optical lens, that be made of the infrared ray photo detector of each element doublet type infrared ray photo detector that to be of a size of directions X 1mm, Y direction 2mm and two interelement gaps be 1mm to direction shown in Figure 3 and day water level land be projected in detected object apart from the infrared detection zone on the 5m place.The projection of shape luminous intensity distribution in the infrared detection zone under this condition forms the rhombus of directions X breadth extreme 11.8m, Y direction breadth extreme 10.8m.

Embodiment 2

Use Fig. 5 and Fig. 6, the mode of the invention that relates topresent embodiment 2 is described.Fig. 5 represent the optical lens that will be among theembodiment 1 uses to second strong point 11 that makes lowerside support portion 2 direction consistent with detecting device TAB8, be the luminous intensity distribution optical axis of infraredray photo detector 4 and each lens section rotated with respect to the normal basis fiducial axis 45 when spending above the perspective summary, in the infra-red ray detection device of Fig. 6presentation graphs 5 with Fig. 4 with the detected object of condition setting projection infrared detection zone apart from the 5m place.At this moment, optical axis change along with lens section, size, shape, the luminous intensity distribution of cutting apart the infrared detection zone of division are different with infrared detection zone shown in Figure 4, and the projection of shape in infrared detection zone is the quadrilateral of directions X breadth extreme 9.4m, Y direction breadth extreme 8.3m.

Embodiment 3

Fig. 7 represents to form that focal length with the upper side collector lens is that 5.8mm ± 0.2mm, infrared detection Region Segmentation are that the Fresnel shape lens aggregate of 7 parts is configured in that spherical radius becomes the locational thin-walled spherical shape lens of 6mm ± 0.2mm, on the lower side support portion of in being assembled toembodiment 1 andembodiment 2, using after, carry out ultrasonic wave coating and be mounted in the infra-red ray detection device on the doublet typeinfrared detector 5 with the same condition that is provided with of Fig. 4 and Fig. 6 under detected object apart from the infrared detection zone in 5m place.The above-mentioned formed infrared detection of the optical lens zone that is divided into seven parts forms the cruciform of directions X breadth extreme 9.1m, Y direction breadth extreme 9.0m.

Claims (2)

1. a resin forming optical lens makes the infrared ray from the detected object face be focused at the infrared ray photo detector, it is characterized in that,

Formed independent separate respectively as the collector lens portion of upper side setting with as the synthetic resin of the support portion on the current pyroelectric infrared detecting device of being fixed on of lower side setting, above-mentioned collector lens portion and support portion are cooperated, utilize the ultrasonic wave coating method with the top and the bottom mechanical connection, and be arranged on the current pyroelectric infrared detecting device as direct lift-launch of incorporate optical lens.

2. resin forming optical lens according to claim 1 is characterized in that,

Above-mentioned resin forming optical lens has to the direction that the electrothermic type infrared detector install to support can be arranged on structure on these 2 directions of second strong point that first strong point that is provided with infrared ray photo detector coaxial direction and axle rotate 45 degree back configurations, and the projection of shape in the infrared detection zone of detected object face can be selected.

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