CN210118645U - Collimated light source system - Google Patents

Abstract

The utility model provides a collimation light source system, its LED lamp, condenser lens, aperture diaphragm and the facula lens that includes coaxial setting, wherein, condenser lens sets up the LED lamp with between the facula lens, be used for the gathering the light that the LED lamp sent, condenser lens is cup-shaped total internal reflection lens, the light that the LED lamp sent is warp condenser lens collects and focuses, projects the logical unthreaded hole of aperture diaphragm, projects to behind the aperture diaphragm plastic facula lens, facula lens can assemble incident light in order to obtain the illuminating beam of approximate parallel outgoing, according to the utility model provides a collimation light source system, its light utilization is high, and the facula illuminance that obtains is even.

Description

Collimated light source system

Technical Field

The utility model belongs to the technical field of the illumination, especially, relate to a collimated light source system.

Background

The collimation illumination is an illumination system composed of a plurality of lenses, and light emitted from the last surface of the collimation illumination is approximately emitted in parallel, so that a uniform illumination area can be obtained on an illuminated plane. The collimating illumination can provide uniform specimen illumination, high resolution and good specimen contrast for bright field, dark field and various phase contrast microscopy, no matter in a transmission light path or a reflection light path, so that the collimating illumination is widely applied to the technical field of microscopes.

The LED lamp is pure in light emitting color, free of stray light, high in lighting effect and excellent in stability, and therefore the LED lamp is mostly used as a light source in the existing collimation lighting. Because the light actually emitted by the LED lamp is a plane light and is emitted to all directions by light rays, the prior collimating illumination only utilizes the light rays emitted forward by the LED, and most of the light rays emitted to the side surface by the LED are not utilized, so that the waste of the LED light rays is caused; meanwhile, the illumination of the illumination light spots generated by the existing collimation illumination is not uniform enough, and halos are easily generated.

Disclosure of Invention

The utility model discloses a solve present collimation illumination and have the extravagant, the not enough even problem of illuminance of LED lamp light, provide a collimation light source system, its light utilization rate is high, and the facula illuminance that obtains is even.

Therefore, the utility model provides a collimation light source system, LED lamp, condenser lens, aperture diaphragm and facula lens including coaxial setting, wherein, condenser lens sets up the LED lamp with between the facula lens, be used for the gathering the light that the LED lamp sent, condenser lens is cup-shaped total internal reflection lens, the light warp that the LED lamp sent condenser lens collects and focuses, projects the clear opening of aperture diaphragm, projects to behind the aperture diaphragm plastic facula lens, facula lens can assemble incident light in order to obtain the illuminating beam of approximate parallel emergence.

The utility model discloses an in some embodiments, cup-shaped total internal reflection lens include refracting surface, printing opacity face and total reflection face, the light that the LED lamp sent forward is followed the printing opacity face collects to aperture stop, the light that the LED lamp sent to the side is followed respectively behind the refracting surface refraction by the total reflection face reflect extremely aperture stop.

In some embodiments of the present invention, the color rendering index of the LED lamp is greater than 70, and the color temperature is 4500K-9000K.

In some embodiments of the present invention, the condenser lens and the spot lens are made of PMMA material, and the transmittance of the PMMA material is greater than 92%.

In some embodiments of the present invention, the condensing lens and the spot lens may also be made of plastic materials such as PC, glass materials, quartz, and other transparent materials.

In some embodiments of the present invention, the illuminance uniformity of the collimated light source system is greater than 0.8.

In some embodiments of the present invention, the aperture stop is disposed on the common focal plane of the refraction surface and the total reflection surface of the condenser lens, and the light from the LED lamp converged by the condenser lens is minimum in the diameter of the aperture stop plane.

In some embodiments of the present invention, the exit end of the cup-shaped total internal reflection lens included in the condensing lens is further provided with a truncated cone cover, an upper bottom surface of the truncated cone cover is connected to the aperture stop, and a diameter of the upper bottom surface of the truncated cone cover is equal to a diameter of the aperture stop.

In some embodiments of the present invention, the aperture stop may be extended to a coating layer attached to the surface of the truncated cone cover, the coating layer may prevent light from exiting the condensing lens from the truncated cone cover.

In some embodiments of the present invention, the curvature of the incident surface of the spot lens is smaller than the curvature of the exit surface.

According to the utility model provides a collimation light source system, it adopts cup-shaped total internal reflection lens as condensing lens, and the light that can furthest's utilization LED lamp sent throws it on facula lens, and facula lens assembles incident light in order to obtain the illuminating beam of approximate parallel emergence, can obtain the even circular facula of illuminance.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

Fig. 1 is a schematic diagram of an optical structure of a collimated light source system according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a condensing lens in a collimated light source system according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of the optical path of the collimated light source system of FIG. 1; and

fig. 4 is an illuminance distribution diagram of an illumination spot at 400mm obtained by computer simulation calculation using the collimated light source system according to an embodiment of the present invention.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to further explain the present invention in detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1, a specific embodiment of the utility model provides a collimation light source system, it includes theLED lamp 1 of coaxial setting,condensing lens 2 andfacula lens 3, wherein,condensing lens 2 sets up betweenLED lamp 1 andfacula lens 3, a light for gatheringLED lamp 1 and sending, condensinglens 2 is cup-shaped Total internal reflection lens (Total internal reflection lens, TIR lens for short), light thatLED lamp 1 sent throws to faculalens 3 behind condensinglens 2,facula lens 3 can assemble incident light in order to obtain the illuminating beam of approximate parallel outgoing, and then, can obtain comparatively even illuminating spot on being lighted the plane.

The utility model discloses a cup-shaped TIR lens can carry out the total internal reflection with the light thatLED lamp 1 sent to the place ahead and to side to gather the light thatLED lamp 1 sent, with project onfacula lens 3, and then, the light thatLED lamp 1 sent can be utilized to the high efficiency. It can be understood that, for the light that furthest utilizedLED lamp 1 to send, the utility model provides a when collimation light source system installs, condensinglens 2's bottom should not be higher than the light emitting area ofLED lamp 1 to receive all light thatLED lamp 1 sent. Meanwhile, the specific installation and fixing method of each lens and theLED lamp 1 are known to those skilled in the art, and the present invention is not described herein again.

It is understood that the present invention is not limited to the specific structure of the cup-shaped TIR lens, and that various structures of the TIR lens may be adopted as long as the light emitted from theLED lamp 1 is collected. Preferably, referring to fig. 2, in some embodiments of the present invention, the cup-shaped TIR lens, i.e. thecondensing lens 2, includes a refractive surface 21, a light-transmitting surface 22 and a reflective surface 23, light emitted from theLED lamp 1 in the forward direction is collected to thespot lens 3 from the light-transmitting surface 22, and light emitted from theLED lamp 1 in the sideward direction is reflected to thespot lens 3 from the reflective surface 23 after being refracted from the refractive surface 21, respectively.

That is, referring to fig. 3, in this embodiment, the cup-shaped TIR lens mainly completes the light collection of theLED lamp 1 by two parts, the light of theLED lamp 1 in the forward direction is collected in a penetrating manner by the small curved surface (i.e. the light transmission surface 22) inside the cup-shaped TIR lens, and the light of the side beyond the diameter of the light transmission surface 22 is collected in a manner of being refracted to the reflection surface 23 by the refraction surface 21 and then being reflected by the reflection surface 23. The light emitted from theLED lamp 1 can be collected by the cup-shaped TIR lens to be projected onto thespot lens 3, and then the incident light is collected by thespot lens 3 to obtain an approximately parallel outgoing illumination beam.

Further, for preventing at the in-process of work, cup-shaped TIR lens, the light that condensinglens 2 produced miscellaneous light orpartial LED lamp 1 and sent can't be gathered by cup-shaped TIR lens and cause the condition of light leak to take place promptly, furthest utilizes the light thatLED lamp 1 sent in some embodiments of the utility model, the printing opacity face is the convex surface to LED light source direction, the inclination of refracting surface is positive and negative 10 degrees, the radian of plane of reflection is total internal reflection face.

Of course, the reflection efficiency of the cup-shaped TIR lens can also be improved by enlarging the reflection area. In order to reduce the volume of the cup-shaped TIR lens and reduce the influence caused by the large volume, in some embodiments of the present invention, the height of the cup-shaped TIR lens is less than 9mm, and meanwhile, the distance between the top of thespot lens 3 and the PCB board at the bottom of theLED lamp 1 can be less than 29mm through the structural design, so as to obtain a collimating light source system with a very small volume.

It can be understood that the utility model discloses a cup-shaped TIR lens be axisymmetric's shape, and it is circular at the facula that forms after the light that sendsLED lamp 1 assembles, then receives the circular facula that cup-shaped TIR lens assembled throughfacula lens 3 after, andfacula lens 3 can obtain the illuminating beam of approximate parallel outgoing, and it shines and is forming the even circular facula of illuminance on shining plane or screen.

It is understood that the present invention is not limited to the shape of thespot lens 3, and various convex lenses may be used as long as the divergent light rays pass through the convex lenses to obtain the illumination light beams which are emitted approximately in parallel. Further, in some embodiments of the present invention, as shown with reference to fig. 1-2, the curvature of the incident surface of thespot lens 3 is smaller than the curvature of the exit surface.

Further, for the depth of parallelism and the luminance of the illuminating beam who obtains of improvement some embodiments of the utility model, refer to fig. 1, fig. 3 and show, still be equipped withaperture diaphragm 4 betweencondensing lens 2 andfacula lens 3,aperture diaphragm 4 sets up on the common focal plane of condensing lens's refracting surface and total reflection surface, and the light that comes from the LED lamp that is assembled by condensing lens is minimum at aperture diaphragm plane diameter.

Further, in order to reduce the complexity of the structural design and improve the light utilization ratio, as shown in fig. 1-2, in some embodiments of the present invention, the cup-shaped total internal reflection lens, i.e., the exit end of thecondensing lens 2, is further provided with a truncated cone cover 24, the upper bottom surface of the truncated cone cover 24 is connected with theaperture stop 4, and the diameter of the upper bottom surface 25 of the truncated cone cover 24 is equal to the diameter of theaperture stop 4. Furthermore, the light rays converged by thecondenser lens 2 can be limited in the truncated cone cover, and the loss of the light rays is reduced. Of course, the side surface of the truncated cone cover 24 may be a specular reflection surface to reduce light loss and improve light utilization. Further, by providing the truncated cone cover 24, the light emitted from theLED lamp 1 can be converged into a circular spot having high brightness and no halo (i.e., a circular spot converged on the upper bottom surface 25 of the truncated cone cover 24). That is, the surface light source of theLED lamp 1 may be converted into a point-like light source and then projected onto thespot lens 3 through the point-like light source. Thefacula lens 3 has the function of converging light, can converge the light projected by the point light source to obtain the illuminating light beam which is approximately emitted in parallel, and further the brightness of the circular facula obtained by the illuminating light beam emitted by thefacula lens 3 is high, the halo is small, and the illuminance uniformity is more than 0.8. Fig. 4 shows an illuminance distribution diagram of an illumination spot at 400mm generated by a collimated light source system according to an embodiment of the present invention, which is obtained by computer simulation assuming that the luminous flux of theLED lamp 1 is 300 Lm.

The following table is a list of various parameters of spots obtained at screen distances of 250mm, 400mm, and 500mm obtained by computer simulation. Wherein can see that under the condition that the luminous flux ofLED lamp 1 is 300Lumen, adopt the utility model provides a collimated light source system is about 80mm at the illumination facula size when 400mm irradiation distance.

	Distance between screens is 250mm	Distance between screens is 400mm	Distance between screens500mm away
				Luminous flux	300Lumen	300Lumen	300Lumen
Spot size	44.72839610634995mm	80.64460783549825mm	97.29246505000052mm
				Maximum illumination	60561.73442176895Lux	23228.27131472634Lux	14672.72853841434Lux

It is understood that the present invention is not limited to the specific type of theLED lamp 1, and can be selected according to actual requirements, such as color temperature, color reduction degree, etc. In some embodiments of the present invention, the CRI (i.e. color rendering index) of theLED lamp 1 is between 70-90, and under a higher color rendering index, the present invention provides a color fidelity of the collimated light source system, which is strong to the color reduction capability of the object. Meanwhile, in some embodiments of the present invention, the CCT (i.e. color temperature) of theLED lamp 1 is 4500K-9000K, the color rendering index is 90, and the light source can reproduce the color of the object itself well, which has a good effect on detecting the color difference defect. LED lamps having a color rendering index of greater than 90 and color temperatures of 4500K-9000K are commercially available, for example, Cree XP-G3 may be used forLED lamp 1.

It should also be understood that the present invention is not limited to the material of thecondenser lens 2 and thespot lens 3, and can be made of various transparent materials in the field, such as optical glass material, PC material, etc. The utility model discloses an in some embodiments,condensing lens 2 andfacula lens 3 are made by the PMMA material (polymethyl methacrylate material promptly, also known as ya keli material), and the luminousness of PMMA material is greater than 92%, and the luminousness is higher, and the utilization ratio of light is higher.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. The collimating light source system is characterized by comprising an LED lamp, a condenser lens, an aperture diaphragm and a spot lens which are coaxially arranged, wherein the condenser lens is arranged between the LED lamp and the spot lens and used for gathering light rays emitted by the LED lamp, the condenser lens is a cup-shaped total internal reflection lens, the light rays emitted by the LED lamp are collected and focused by the condenser lens, are projected to a light through hole of the aperture diaphragm and are projected to the spot lens after being shaped by the aperture diaphragm, and the spot lens can converge incident light rays to obtain illuminating light beams which are emitted approximately in parallel.

2. The system of claim 1, wherein the cup-shaped tir lens comprises a refractive surface, a transparent surface and a total reflection surface, wherein the forward light of the LED lamp is collected to the aperture stop from the transparent surface, and the sideward light of the LED lamp is refracted by the refractive surface and then reflected to the aperture stop by the total reflection surface.

3. The collimated light source system of claim 1, wherein the LED lamp has a color rendering index of greater than 70 and a color temperature of 4500K-9000K.

4. The collimated light source system of claim 1, wherein the condenser lens and the spot lens are both made of PMMA material having a light transmittance of greater than 92%.

5. The collimated light source system of claim 1, wherein the condenser lens and the spot lens are made of PC, glass, or quartz.

6. The collimated light source system of claim 1, wherein the uniformity of illumination of the collimated light source system is greater than 0.8.

7. The collimated light source system of claim 1, wherein an aperture stop is provided between the condenser lens and the spot lens, the aperture stop being provided on a common focal plane of the refracting surface and the total reflecting surface of the condenser lens, and the light from the LED lamp converged by the condenser lens is smallest in diameter at the aperture stop plane.

8. The collimated light source system of claim 1, wherein the exit end of the cup-shaped tir lens included in the condenser lens is further provided with a truncated cone cover, an upper bottom surface of the truncated cone cover is connected to the aperture stop, and a diameter of the upper bottom surface of the truncated cone cover is equal to a diameter of the aperture stop.

9. The collimated light source system of claim 8, wherein the aperture stop is extendable to a coating layer attached to the surface of the truncated cone cover of claim 8, the coating layer preventing light from exiting the condenser lens from the truncated cone cover.

10. The collimated light source system of claim 1, wherein the curvature of the entrance surface of the spot lens is smaller than the curvature of the exit surface.

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