WO2010088792A1

WO2010088792A1 - Reflective infrared video camera

Info

Publication number: WO2010088792A1
Application number: PCT/CN2009/000789
Authority: WO
Inventors: 王尤山; 李锦泉; 李富峰
Original assignee: Wang Youshan; Li Jinquan; Li Fufeng
Priority date: 2009-02-05
Filing date: 2009-07-13
Publication date: 2010-08-12
Also published as: CN101799615B; CN101799615A

Abstract

A reflective infrared video camera (100) includes a light-projecting device (1), an image pickup device (2), and an adjusting device. The light-projecting device emits an infrared light toward a monitoring region. The image pickup device receives image information concerning the monitoring region. The light-projecting device includes a LED light-emitting source (10) and a reflector (11) disposed behind same. The infrared light emitted by the LED light-emitting source is reflected once and then illuminates the monitoring region. The adjusting device can adjust the light-projecting angle of the light-projecting device.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to an infrared camera, and more particularly to an active infrared camera that uses an LED as a light source. Background technique

At present, LED light source has been widely used in the field of image illumination such as background light source, display device, copier, laser printer, etc. due to its advantages of high efficiency, energy saving, environmental protection, long life and small size. The above applications are usually limited to «Giant area array illumination, Single-particle combination display use, which is determined by the LED scattering luminescence characteristics, and its initial divergence angle can be close to 180. , 1 ^ is very advantageous for large-area illumination, but the illumination distance has P. ^ LED manufacturers usually carry out simple light distribution during packaging, shrinking divergence angle, for example, using a cylindrical lens package, can shrink the divergence angle by a certain amount. 60°, 30°, 15° half power divergence angle can be seen on the market, but its light utilization rate is low. The concentrating lens is directly in contact with the light emitting chip package, and the working temperature is high, it is easy to age, cracks occur, and the lens is transparent. Performance has dropped significantly. A large amount of light diffuses and reflects in the package body, and more heat energy is generated, causing the package lens to age further. Some high-power light sources are combined with the above LED array, but the volume is large, the divergence angle is large, and it is inconvenient for large power to transmit light. . In recent years, security monitoring systems such as the Safe City project have been trending around the clock, and for nighttime monitoring, infrared lighting is generally required to reduce light pollution. The technology and technology of LED infrared light source have been matured. Near-infrared LED has become a better infrared light source with low energy consumption and long life. Under the monitoring system of giant separation, LED is widely used as a light source for both visible light and infrared light. The giant infrared monitoring system is generally used in a single infrared LED bundle array that is packaged in a simple concentrating package, and is bundled with a large area to form a high-power LED array to send light to the giant. However, due to its large size, as well as the short life and high maintenance costs of the lighting system, it further restricts its further development and application. The principle of the infrared camera is to use a light projecting device to emit infrared light to the monitoring area, and the infrared light reflected by the area is received by the image capturing device, and after photoelectric conversion and circuit amplification and comparison, a corresponding signal is generated, and then transmitted to the control circuit. Or CPU processing, on the final monitor screen Display image information. In the infrared camera of the prior art, in addition to the above-mentioned defects, the LED light source used in the light projecting device cannot be flexibly applied to various occasions requiring large separation and large separation monitoring. Therefore, how to invent a more advanced and reliable infrared camera to overcome the many defects commonly existing in infrared cameras has become a common problem in the industry. Summary of the invention

It is an object of the present invention to provide a high performance reflective infrared camera.

The object of the present invention is achieved by the following technical solutions: A reflective infrared camera comprising a light projecting device and a camera device. The light projecting device emits infrared light to the monitoring area, and the image capturing device receives image information of the monitoring area. The light projecting device includes an LED emitting light source and a mirror located behind the LED emitting light source, and the infrared light emitted by the LED emitting light source is irradiated to the monitoring area after being reflected once.

Further, the LED emission source is located on the optical axis of the mirror. Further, the LED emission source is located off-axis of the mirror. Further, the reflective infrared camera further includes an adjusting device that adjusts a light projecting angle of the light projecting device.

Further, the adjusting device adjusts the light projecting angle of the light projecting device by adjusting the distance between the LED emitting light source and the mirror. Further, the LED emitting light source comprises an LED integrated light source.

Further, the LED emitting light source comprises an LED integrated light source and at least one array of conventional LED emitting light sources located around the LED integrated light source. Further, the LED integrated light source comprises a substrate, a plurality of LED chips matrix-bound on the substrate, a stage disposed between the LED chips, and a cladding layer encapsulated on the outside of the LED chip.

Further, the stage includes an upper metal foil and a lower insulating layer. Further, the LED chips are arranged in a plurality of rows and columns, wherein the rows are connected in series, longitudinal Listed in parallel.

Further, the mirror is a piecewise change curvature or a smooth change curvature.

Further, the reflective infrared camera further includes a heat pipe connected to the LED emitting light source and acting to dissipate heat.

Further, the reflective infrared camera further includes a water-cooled or air-cooled system that is coupled to the LED emitting light source and functions to dissipate heat.

Further, the imaging device is located outside the aperture of the light projecting device.

Further, a portion of the camera device is located within the aperture of the light projecting device.

Further, the imaging device is located within the aperture of the light projecting device.

Further, the light projecting device and the image capturing device are disposed coaxially. The object of the present invention can also be achieved by the following technical solutions: A reflective infrared camera comprising a light projecting device and a camera device. The light projecting device emits infrared light to the monitoring area, and the image capturing device receives image information of the monitoring area. The light projecting device includes an LED emitting light source and a mirror that reflects infrared light to the monitoring area, and the LED emitting light source includes an LED integrated light source.

Further, the LED integrated light source comprises a substrate, a plurality of LED chips matrix-bonded to the substrate, a stage disposed between the LED chips, and a cladding layer encapsulated on the outside of the LED chip.

Further, the stage includes an upper metal foil and a lower insulating layer.

Further, the LED chips are arranged in a plurality of courses and columns, wherein the courses are in series and the columns are in parallel.

Further, the reflective infrared camera further includes an adjusting device that adjusts a light projecting angle of the light projecting device.

Further, the adjusting device adjusts the light projecting angle of the light projecting device by adjusting the distance between the LED emitting light source and the mirror.

The object of the present invention can also be achieved by the following technical solutions: A reflective infrared camera comprising a light projecting device and a camera device. The light projecting device emits infrared light to the monitoring area, and the camera The device receives image information of the monitored area. The light projecting device includes an LED emitting light source and a mirror that reflects infrared light to the monitoring area, the mirror having a modified curvature.

Further, the mirror has a piecewise varying curvature.

Further, the mirror has a smooth varying curvature.

The object of the present invention can also be achieved by the following technical solutions: A reflective infrared camera comprising a light projecting device and a camera device. The light projecting device emits infrared light to the monitoring area, and the image capturing device receives image information of the monitoring area. The light projecting device includes an LED emitting light source, a reflecting mirror that reflects the infrared light to the monitoring area, and a heat pipe that helps the LED emitting light source to dissipate heat. The object of the present invention can also be achieved by the following technical solutions: A reflective infrared camera comprising a light projecting device and a camera device. The light projecting device emits infrared light to the monitoring area, and the image capturing device receives image information of the monitoring area. The light-emitting device includes an LED emitting light source, a mirror that reflects the infrared light to the monitoring area, and a water-cooled or air-cooled system that assists in the heat dissipation of the LED emitting light source.

Compared with the prior art, the reflective red photographic camera of the present invention has higher efficiency and better performance by infrared light emission by a single reflection type light projection mode.

Compared with the prior art, the reflective infrared camera of the present invention uses an integrated LED light source as an emission source to make the volume smaller and the performance better.

Compared with the prior art, the reflective infrared camera of the present invention adopts a mirror having a modified curvature, which makes the light projection effect better and the performance better.

Compared with the prior art, the reflective infrared camera of the present invention uses a heat pipe or a water cooling or air cooling system to dissipate heat, so that the heat sink block is not required to be mounted on the LED emitting light source, and the defect of blocking infrared emitting light can be effectively avoided. , making the light projection effect better and the performance better. DRAWINGS FIG. 1 is a schematic structural view of a reflective infrared camera of the present invention.

2 is a schematic structural view of an LED integrated light source of the present invention. Figure 3 is a cross-sectional view taken along line A-A of Figure 2. In the figure: 1, light projection device, 2, camera device, 10, LED emission source, 11, mirror, 100, reflective infrared camera, 101, LED chip, 102, 103, slide, 104, coated Layer, 105, annular groove. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. It is to be understood that the appended drawings are not intended to be a In addition, the drawings are not necessarily drawn to scale.

As shown in FIG. 1, the reflective infrared camera 100 of the present invention includes a light projecting device 1 and an image pickup device 2, wherein the light projecting device 1 emits infrared light A to a monitoring area, and the image capturing device 2 receives image information of a monitoring area. The image is displayed on the monitor screen (not shown) after processing. The light projecting device 1 includes an LED emitting light source 10 and a mirror for reflecting the emitted light of the LED emitting light source 10 into the monitoring area. The LED emitting light source 10 is located in front of the mirror 11, or the mirror 11 is located at the LED. The rear of the light source 10 is emitted. In the embodiment shown in FIG. 1, the LED emitting light source 10 is located on the optical axis of the mirror 11, that is, the two are coaxially disposed. The LED emitting light source 10 emits infrared light backward to the mirror 11, and the infrared light is reflected by the mirror 11 and then irradiated to the monitoring area. Since the LED emitting light source 10 of the reflective infrared camera 100 is in front of the mirror 11 and the LED emitting light source 10 is located on the optical axis of the mirror 11, a portion of the infrared light reflected from the mirror 11 is blocked. Further, in another preferred embodiment of the present invention, the off-axis type is adopted, that is, the LED emitting light source 10 is located outside the aperture of the mirror 11. With the off-axis type, there is no phenomenon that the LED emitting light source 10 blocks infrared light. Compared with the conventional LED front end, which requires a focusing lens to be irradiated with infrared light to the monitoring area, the reflective infrared camera 100 of the present invention does not use a lens, and irradiates infrared light to the monitoring area only by one reflection. Avoiding the attenuation of the infrared light by the lens, red External light is more efficient to use. Moreover, the present invention can conveniently adjust the position of the mirror 11 and other parameters to change the illumination distance and range of the infrared light, and realize the dynamic zooming of the emission angle of the infrared LED light source for the first time, which is more convenient and flexible, and is described in detail later.

As shown in FIG. 2 and FIG. 3, in a preferred embodiment of the present invention, the LED emitting light source 10 is an array LED integrated light source, or a multi-die array package near-infrared LED light source. The LED integrated light source 10 can be referred to in the description of Chinese Patent No. 200720008026.6.

The LED integrated light source 10 includes a plurality of LED chips 101, which are bound to a substrate 102 in a matrix string and parallel manner, and a plurality of LED chips 101 and 1 102 can be further disposed. The wafer stage 103 is used to carry and connect the LED chip 101, and then a region of the LED chip 101 is bonded to the substrate 102 to form a cladding layer 104 on the encapsulation material. Wherein, the encapsulating material may be an epoxy resin or the like. The plurality of LED chips 101 may be arranged in a plurality of courses and columns, wherein the courses are in series and the columns are in parallel.

The iJ! 102 is preferably an aluminum substrate or other metal material. The main purpose is to replace the traditional PCB board to effectively solve the heat dissipation problem. The stage 103 may include an upper metal foil (not shown) and a lower insulating layer (not shown) _{. The} metal foil is used to bond the LED chip 101, and the insulating layer serves to insulate. In a preferred embodiment of the invention, the upper metal foil is a copper foil.

An outer circumference of the region where the 1102 is bonded to the LED chip 101, that is, the outer periphery of the carrier 103 and the cladding layer 104 is further provided with an annular groove 105, which is disposed to prevent moisture or the like from being coated with the iiX cladding layer 104. Thereby, the LED chip 101 is prevented from getting wet. Since the LED integrated light source 10 integrates a plurality (several or even hundreds) of LED chips, distributed in a matrix arrangement on a substrate 102, it can be longer than the conventional single LED chip.

Since the bottom of the LED chip directly contacts the metal substrate, the heat can be directly emitted from the metal, thereby solving the heat dissipation problem, which can greatly reduce the light decay and improve the service life. Since the LED integrated light source 10 uses an integrated technology to uniformly distribute a plurality of LED chips on the substrate 102 in a matrix arrangement manner, the size of the light source is reduced, which is advantageous for convergence of infrared light. Therefore, the volume of the product is also greatly reduced, and the product can be ultra-small.

On-line infrared camera 100. With the LED integrated light source 10 described above, the deficiencies of the conventional LED illumination source can be overcome. It is true that the LED emitting light source 10 of the reflective infrared camera 100 of the present invention can also adopt a combination of an LED integrated light source and a conventional LED emitting light source. Specifically, in another embodiment of the present invention, one or more conventional LED light sources are added around the arrayed LED integrated light source. According to the actual test, such a setting can effectively reduce the problem that the infrared camera 100 has a dark area when the macro camera is monitored. In the embodiment shown in FIG. 1, the mirror 11 is reflected by a single curvature. In another preferred embodiment of the present invention, the mirror 11 can also adopt a modified curvature, that is, a segmentation change can be adopted. Curvature or smooth change curvature. According to the test, such an arrangement can also effectively reduce the problem that the infrared camera 100 has a dark area when it is closely monitored. The reflective infrared camera 100 of the present invention further includes an adjustment device or an adjustment system (not shown). The adjusting device can adjust the light projecting angle of the light projecting device 1, that is, enlarge or reduce the light projecting angle of the light projecting device 1. When it is necessary to monitor the large distance, the imaging device 2 focuses on the remote monitoring area, and at this time, the adjusting device reduces the light projecting angle of the light projecting device 1 to illuminate the infrared light to a sufficiently far distance. When it is necessary to monitor a 3⁄4 giant or wide area, the control camera 2 is focused on the near area, and the adjusting device amplifies the light projecting angle of the light projecting device 1 to illuminate the infrared light to a sufficiently close distance or a wide area. The synchronization between the light projecting device 1 and the camera device 2 can be realized by a microcontroller (MCU), which is a well-known technology in the industry and will not be described in detail herein. The light projecting device 1 and the image pickup device 2 are effectively synchronized, and the application range of the reflective infrared camera 100 of the present invention is expanded. Specifically, how the adjusting device adjusts the light projecting angle of the light projecting device 1 is achieved by adjusting the distance between the mirror 11 and the LED light source 10 in a preferred embodiment of the present invention. The light projecting device 1 can flexibly change the light projection angle, thereby effectively changing the infrared light. Light irradiation distance and irradiation range. The reflective infrared camera 100 of the present invention achieves the effect of zooming the angle of emission of the LED light source by adjusting the position of the mirror 11. It has been mentioned in the above description that the distance between the adjustment mirror 11 and the LED emission source 10 is changed to change the projection angle, and finally the effect of the magnification of the emission angle of the LED emission source is achieved. It is to be noted that the reflective infrared camera 100 of the present invention can also achieve the effect of zooming the angle of emission of the LED emitting light source by adjusting other parameters such as the shape or aperture size of the mirror 11. In another embodiment of the present invention, the mirror 11 is divided into two or three or even multiple pieces, and the shape and the aperture are changed by different combinations, thereby realizing the effect of the magnification of the emission angle of the LED light source. This is not possible with traditional infrared cameras. Further, the reflective infrared camera 100 of the present invention applies heat pipe technology to solve the heat dissipation problem of the LED emitting light source 10. Specifically, the LED emitting light source 10 utilizes a heat pipe technology to avoid installing a large-sized heat-dissipating block on the LED emitting light source and blocking the infrared emitting light, thereby solving the heat dissipation problem and solving the heat-dissipating block blocking the infrared light. problem. In another embodiment of the present invention, water cooling technology is applied to the present invention, and a water cooling system is used in place of the heat pipe to solve the heat dissipation problem of the LED emitting light source 10. In still another embodiment of the present invention, an air-cooling technique is applied to the present invention to solve the heat dissipation problem of the LED-emitting light source 10 by utilizing an air-cooling system. It should be noted that the application of the heat pipe, water cooling or air cooling technology to the reflective infrared camera can effectively solve the problem that the reflected light is easily blocked by the large heat sink block of the LED emitting light source, so that the reflective infrared camera can fully It is used, which will be a sudden use in the industry. Whether a reflective infrared camera using an LED integrated light source requires a heat pipe, water cooling or air cooling system to dissipate heat depends on the situation. Since the heat pipe, water cooling or air cooling technology is a mature cooling cooling technology, it will not be described here. In a preferred embodiment of the present invention, the imaging device 2 is located within the aperture of the light projecting device 1, that is, both have the same optical axis (coaxial arrangement), and the imaging device 2 is located directly in front of the light projecting device 1. This arrangement facilitates miniaturization of the reflective infrared camera 100. In another preferred embodiment of the present invention, the imaging device 2 may be disposed outside the aperture of the light projecting device 1, that is, the light projecting device 1 may be disposed above or below the imaging device 2, or may be disposed in the imaging device 2. Left and right sides, etc. This setting is beneficial to the infrared light energy without any The blockage is fully illuminated to the monitoring area. In another preferred embodiment of the present invention, the light projecting device 1 may be disposed to intersect with the image capturing device 2, that is, a portion of the image capturing device 2 is located in the aperture of the light projecting device 1, and a portion thereof is located outside the aperture of the light projecting device 2. . This arrangement can not only facilitate the miniaturization of the reflective infrared camera 100, but also facilitate the effective illumination of the light to the monitoring area. It should be noted that the technical solutions disclosed in the above embodiments of the present invention can be applied to a multi-reflection infrared camera, in addition to being applied to a single-reflection infrared camera. For example, the present invention utilizes an LED integrated light source and can also be applied to an infrared camera that has undergone multiple reflections. For example, the present invention changes the curvature of the mirror, i.e., using a piecewise varying curvature or a smooth varying curvature, and can also be applied to an infrared camera that has undergone multiple reflections. For example, the present invention utilizes a heat-dissipating cooling technique such as a heat pipe, water cooling or air cooling technology, and can also be applied to an infrared camera that has undergone multiple reflections. It is to be understood that those skilled in the art can make equivalent substitutions or changes to the inventions and the inventions of the present invention. All such changes or substitutions are intended to fall within the scope of the appended claims.

Claims

Rights request

A reflective infrared camera comprising a light projecting device and an image capturing device, wherein the light projecting device emits infrared light to the monitoring area, and the image capturing device receives image information of the monitoring area, wherein the light projecting device comprises an LED emitting light source and The mirror is located behind the LED emitting light source, and the infrared light emitted by the LED emitting light source is reflected by one time and then irradiated to the monitoring area.

2. A reflective infrared camera according to claim 1, wherein the LED emitting source is located on the optical axis of the mirror.

3. The reflective infrared camera of claim 1 wherein: the LED emitting source is located off-axis of the mirror.

4. The reflective infrared camera according to claim 1, wherein the reflective infrared camera further comprises an adjusting device for adjusting a light projecting angle of the light projecting device.

5. The reflective infrared camera of claim 4, wherein: the adjusting device adjusts a light projecting angle of the light projecting device by adjusting a distance between the LED emitting light source and the mirror.

6. The reflective infrared camera of claim 1 wherein: the LED emitting source comprises an LED integrated light source.

7. The reflective infrared camera of claim 1, wherein the LED emission source comprises an LED integrated light source and at least one turn of a plurality of conventional LED emission sources arranged around the LED integrated light source.

The reflective infrared camera according to claim 6 or 7, wherein the LED integrated light source comprises a substrate, a plurality of LED chips matrix-bound on the substrate, and a slide disposed between the substrate and the LED chip. And a cladding layer encapsulated on the outside of the LED chip.

9. The reflective infrared camera according to claim 8, wherein the stage comprises an upper metal foil and a lower insulating layer.

10. The reflective infrared camera according to claim 8, wherein the LED chips are arranged in a plurality of courses and columns, wherein the courses are connected in series, and the columns are connected in parallel.

11. The reflective infrared camera of claim 1, wherein: the mirror is a piecewise varying curvature or a smoothly varying curvature.

12. The reflective infrared camera of claim 1, wherein: the reflective infrared camera further comprises a heat pipe coupled to the LED emitting light source and configured to dissipate heat.

13. The reflective infrared camera according to claim 1, wherein: the reflective infrared camera further comprises a water-cooled or air-cooled system connected to the LED light source and configured to dissipate heat.

14. The reflective infrared camera of claim 1, wherein: the imaging device is located outside the aperture of the light projecting device.

15. The reflective infrared camera of claim 1, wherein: a portion of the camera device is located within the aperture of the light projecting device.

16. The reflective infrared camera of claim 1, wherein: the imaging device is located within the aperture of the light projecting device.

17. The reflective infrared camera according to claim 16, wherein the light projecting device and the image pickup device are disposed coaxially.

18. A reflective infrared camera comprising a light projecting device and an image capturing device, wherein the light projecting device emits infrared light to the monitoring area, and the image capturing device receives image information of the monitoring area, wherein the light projecting device comprises an LED emitting light source and Reflecting infrared light to the mirror of the monitoring area, the LED emitting light source includes an LED integrated light source.

19. The reflective infrared camera of claim 18, wherein: the LED integrated light source comprises a substrate, a plurality of LED chips matrix-bound on the substrate, a carrier disposed between the substrate and the LED chip, and A cladding packaged on the outside of the LED chip.

20. The reflective infrared camera of claim 19, wherein: the stage comprises an upper metal foil and a lower insulating layer.

21. A reflective infrared camera according to claim 20, wherein the LED chips are arranged in a plurality of courses and columns, wherein the courses are in series and the columns are in parallel.

The reflective infrared camera according to claim 18, wherein the reflective infrared camera further comprises an adjusting device for adjusting a light projecting angle of the light projecting device.

23. The reflective infrared camera of claim 22, wherein: the adjusting device adjusts a light projecting angle of the light projecting device by adjusting a distance between the LED emitting light source and the mirror.

24. A reflective infrared camera comprising a light projecting device and an image capturing device, wherein the light projecting device emits infrared light to the monitoring area, and the image capturing device receives image information of the monitoring area, wherein the light projecting device comprises an LED emitting light source and Reflecting infrared light into the mirror of the monitoring area, the mirror has a modified curvature.

25. The reflective infrared camera of claim 24, wherein: the mirror has a segmentally varying curvature.

26. The reflective infrared camera of claim 24, wherein: the mirror has a smoothly varying curvature.

The reflective infrared camera according to claim 24, wherein the reflective infrared camera further comprises adjustment means for adjusting a light projecting angle of the light projecting means.

The reflective infrared camera according to claim 27, wherein the adjusting means adjusts a light projecting angle of the light projecting means by adjusting a distance between the LED emitting light source and the mirror.

29. A reflective infrared camera, comprising a light projecting device and a camera device, wherein the light projecting device emits infrared light to the monitoring area, and the image capturing device receives image information of the monitoring area, wherein the light projecting device comprises an LED emitting light source, A reflector that reflects infrared light to the monitoring area and a heat pipe that helps the LED emit light to dissipate heat.

30. A reflective infrared camera, comprising a light projecting device and an image capturing device, wherein the light projecting device emits infrared light to the monitoring area, and the image capturing device receives image information of the monitoring area, wherein the light projecting device comprises an LED emitting light source, A mirror that reflects infrared light to the monitoring area and a water-cooled or air-cooled system that helps the LED emit light to dissipate heat.