KR100816839B1 - Instrument and method to quantify the led incident angle of led ring light for high luminance and even light distribution - Google Patents

Abstract

An apparatus and a method for measuring an incident angle of an LED(Light Emitting Diode) for generating high-brightness collimated light of an LED ring-shaped light source are provided to quantify luminance distribution on a reflection plate and to design a ring-shaped light source. An apparatus for measuring an angle of incidence of LED for generating high-brightness collimated light of LED ring-shaped light source comprises a reflection plate(110), a CCD camera(10) photographing luminance distribution on the reflection plate, rotation stages(30) spaced in both sides of the CCD camera and a print circuit board(80) positioned on the respective rotation stages. The rotation stages are rotated to make an angle of incidence of the LED perpendicular to the emitting surface, thereby controlling offset.

Description

INSTRUMENT AND METHOD TO quantify the LED incident angle of LED ring light for high luminance and even light distribution}

1 is a three-dimensional view for explaining an incident angle measuring device of a light emitting diode according to an embodiment of the present invention.

2 is a perspective view illustrating an incident angle measuring device of a light emitting diode according to an exemplary embodiment of the present invention.

3 is a schematic flowchart of detecting an illuminance distribution according to an incident angle of an LED of an annular light source from an image obtained from the CCD camera of FIG. 1.

4 illustrates an example of an illuminance distribution graph obtained through an image and an illuminance profile analysis measured using the LED incident angle measuring device of the present invention.

5 illustrates another example of an illuminance distribution graph obtained through an image and an illuminance profile analysis measured using the LED incident angle measuring device of the present invention.

6 is a plan view of an incidence angle measuring device of a light emitting diode of the present invention.

7 is a front view of an incidence angle measuring device of the light emitting diode of FIG. 6.

<Explanation of symbols for the main parts of the drawings>

5: camera unit 7: LED light emitting unit

9: Rotating Stage 10: CCD Camera

15: Camera cradle 20: LED

30: rotating stage 35: rotating stage support

40: upper part of the moving stage 43: track coupling groove

50: rotation stage mainly 60: camera mainly

70: circuit board support 80: printed circuit board

90: circuit board mainly 110: lower part of the moving stage

105: Track 110: Reflector

120: incident angle measurement table

A light emitting diode (hereinafter referred to as LED) relates to a device for measuring an incident angle of a light emitting diode for generating high brightness parallel light of an annular light source, and a measuring method.

In general, industrial cameras used in pre-release inspection for assembly failures such as semiconductors, and inspection cameras of medical diagnostic devices used in the diagnosis of sebum, wrinkles, and skin cancer for dermatology, are required to have a lighting device in order to function properly. Is necessary. Such lighting devices are mainly used for direct lighting, distributed lighting and annular lighting.

The direct lighting device emits light directly onto the irradiation surface using a single or multiple point light sources and has two characteristics depending on the incident angle of the light source.

When the angle of incidence of the light source of the direct lighting device is perpendicular to the irradiation surface, the illuminance is relatively bright and uniform, so that it can be used for various purposes, but there are disadvantages in that a shadow phenomenon occurs in the image and a glare phenomenon occurs.

If the angle of incidence of the light source of the direct illumination device is parallel to the irradiation surface, the geometrical representation of the irradiation surface may be enhanced, but extreme shading occurs in the image.

Diffuse lighting device adds diffuser plate to the path of light source and irradiation surface to focus on even distribution of illumination.It eliminates glare on the image and guarantees even distribution of illumination, but additional diffuser plate This results in spatial limitations in use, deterioration of brightness and degradation of the surface characteristics of the irradiated surface of the image.

The annular lighting device has a structure in which an annular lighting device can be directly attached to the front end of the camera lens, and there is no space limitation in use, no shadow phenomenon, and relatively uniform illumination is guaranteed compared to the direct lighting device.

In order to expand the applicability of the annular lighting device, the conventional annular lighting device using the LED as a point light source uses a multi-row LED arrangement and an elliptical mirror in which the LEDs are arranged in multiple rows to provide a uniform illuminance distribution within the required illuminance. The LED ellipsoidal condensing method, which is a structure for condensing light, is divided into LED ellipsoidal condensing methods.

Korean Patent Application No. 2003-0048640, which is a prior art for solving the above-mentioned problems, relates to an LED lighting apparatus using a printed circuit board, and a line scan camera is stored in the center of the LED lighting apparatus to be perforated to be photographed. On the outer circumferential surface of the housing is formed an elongated insertion groove, and a ring-shaped disc shaped to accommodate the insertion groove, and a stepped jaw is formed at right angles along the periphery of the surface, and on both sides facing the stepped jaw. The printed circuit board is formed of a plurality of lead holes through which lead wires penetrate at regular intervals, and a plurality of LED elements penetrated through the lead wires in the lead holes and soldered to the back surface of the printed circuit board to be coupled to the step. By the LED device is characterized in that the centralized light.

However, domestic patent application No. 2003-0048640 has a problem in that additional cost required for optimizing the light source is generated according to the focal length of the changed optical system and the change in the diameter of the outer circumferential surface of the annular light source after product design. It is inefficient to simply add a line of steps in order to obtain uniform illuminance in the system, which is a fundamental solution to ensure uniform illuminance within the required illuminance of the LED annular light source within the focal length range of the optical system required before product design. There is a problem that the method is not enough.

Therefore, in order to fundamentally solve the above problems, in order to obtain high brightness and uniform illuminance distribution before product design, the LED depends on the diameter of the outer circumferential surface of the annular light source, the divergence angle of the LED and the focal length of the optical system An apparatus for measuring the incident angle of an LED for generating high-brightness parallel light of an LED annular light source for measuring the incident angle of is desired.

Accordingly, the present invention provides a device and a measuring method of the incident angle of the LED for generating high brightness parallel light of the LED annular light source. That is, the incidence angle measuring device of the LED of the present invention measures the incidence angle of the LED depending on the diameter of the outer circumferential surface of the annular light source, the divergence angle of the LED, and the focal length of the optical system to obtain high brightness and uniform illuminance distribution before designing the product. Since the measurement can be performed, the illuminance distribution characteristics on the reflecting plate according to the application characteristics of the LED annular light source can be quantified to provide basic data for designing a general annular light source for generating parallel light.

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide an apparatus and a method for measuring an incident angle of a light emitting diode for generating high brightness parallel light of a light emitting diode annular light source.

Another object of the present invention is to provide a light emitting diode incident angle measuring device and a measuring method capable of measuring the incident angle of the light emitting diode depending on the diameter of the outer peripheral surface of the annular light source, the divergence angle of the light emitting diode and the focal length of the optical system. .

Another technical problem to be achieved by the present invention is to measure the distribution characteristics of the illuminance on the reflector according to the application characteristics of the light emitting diode annular light source, and to measure the angle of incidence of the light emitting diode to enable a general annular light source for parallel light generation and measuring method To provide.

Another technical problem to be achieved by the present invention is to provide a high-brightness light emitting diode detachable to a printed circuit board, and to provide an incident angle measuring device and a measuring method of the light emitting diode to photograph the illuminance distribution on the reflecting plate using a CCD camera.

Hereinafter, an incident angle measuring device and a measuring method of a light emitting diode for generating high brightness parallel light of a light emitting diode annular light source according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a three-dimensional view for explaining an incident angle measuring device of a light emitting diode according to an embodiment of the present invention, Figure 2 is a perspective view for explaining an incident angle measuring device of a light emitting diode according to an embodiment of the present invention. .

The incident angle measuring apparatus of the light emitting diode includes a camera unit 5, an LED light emitting unit 7, a reflecting plate 110, an incident angle measuring table 120, a moving stage upper part 40, and a moving stage lower part 100. In addition, the camera unit 5 is composed of a CCD camera 10, a camera pedestal 15, the camera main 60, the LED light emitting unit 7 is a light emitting diode (LED) 20, a circuit board support 70 ), A printed circuit board 80, and a circuit board main 90. The rotary stage unit 9 consists of a rotary stage 30, a rotary stage pedestal 35, and a rotary stage stem 50.

The camera unit 5 includes a CCD camera 10, a camera pedestal 15, and a camera head 60, and the CCD camera 10 moves back and forth along the camera head 60. The camera head 60 may be provided on the camera stand 15 or in the center of the incident angle measuring table 120. Hereinafter, the camera head 60 is on the camera stand 15. Explain.

The camera pedestal 15 is mounted at the center of the incident angle measuring table 120, and the camera head 60 is positioned on the camera pedestal 15.

The CCD camera 10 photographs the illuminance distribution generated by the LED 20 emitting light and reflected from the reflecting plate 110, and is mounted on the camera main 60 on the camera pedestal 15 in front of the reflecting plate 110. The bottom surface of the CCD camera 10 is provided with a camera main coupling part (not shown), and the camera main coupling part and the camera main 60 are combined to allow the CCD camera 10 to be mounted on the camera pedestal 15. Accordingly, the CCD camera 10 moves back and forth along the camera main 60. That is, the CCD camera 10 is located at the center of the incident angle measurement table 120 to flow along the camera main 60 to allow CCD cameras of various sizes and to adjust the illuminance distribution of the LED 20 on the reflector 110. For shooting.

The camera main 60 is a main path on the camera pedestal 15, which moves the CCD camera 10 back and forth in front of the reflector 110. The camera main 60 may be configured as a hole, a groove or a jaw coupled with a camera main coupling part (not shown) of the CCD camera 10, and may also be configured as a rail. Here, the CCD camera 10 may be configured to be able to flow up to 30 mm along the camera main 60, thereby photographing the illuminance distribution of the LED 20 on the reflector 110 using various sized CCD cameras.

The LED light emitting portion 7 is mounted on the rotating stage portion 9 located on both sides of the camera portion 5 on the incident angle measurement table 120. The LED light emitting unit 7 includes a light emitting diode (LED) 20, a circuit board support 70, a printed circuit board 80, and a circuit board main 90.

The LED 20 is a light emitting diode for measuring an incident angle, and is mounted on the printed circuit board 80 to emit light, thereby measuring the incident angle. Since the LED 20 is detachably attached to the printed circuit board 80, various LED characteristics can be analyzed.

The printed circuit board (PCB) 80 is configured to mount the LED 20 therein, and the printed circuit board 80 is mounted on the circuit board support 70. One side of the printed circuit board 80 is provided with a circuit board mainly coupling portion (not shown), the circuit board mainly coupling portion and the circuit board holder 90 of the circuit board support 70 is coupled, the printed circuit board 80 is mounted to the circuit board support 70. Therefore, the printed circuit board 80 is made to flow along the circuit board main 90 of the circuit board support 70 to adjust its height according to the size of the CCD camera of various sizes. In addition, the printed circuit board 80 is made of a detachable LED (20).

The circuit board support 70 has a circuit board main 90 therein and is mounted on the rotary stage 30. By coupling the circuit board main 90 and the circuit board main coupling part (not shown), the printed circuit board 80 is mounted on the circuit board support 70, and the printed circuit board 80 is the circuit board support 70. It can be moved up and down along the circuit board 90 of the ().

The circuit board main 90 is a main road on the circuit board support 70, and moves the printed circuit board 80 up and down, that is, the LED 20 attached to the printed circuit board 80 up and down. You can. The circuit board main 90 may be configured as a hole, a groove, a jaw, or the like coupled with a circuit board main coupling part (not shown), and may also be configured as a rail.

The rotating stage unit 9 is mounted on the incident angle measuring table 120 on both sides of the camera unit 5. That is, the rotating stage unit 9 is coupled to the rotating stage main unit 50 on the incident angle measurement table 120 on both sides of the camera unit 5, so that the rotating stage unit 9 is the rotating stage main unit 50. Will move left and right along. The rotary stage unit 9 consists of a rotary stage 30, a rotary stage pedestal 35, and a rotary stage stem 50.

The rotating stage 30 is a stage rotating 360 degrees, and the circuit board support 70 is mounted thereon. In addition, the rotation stage 30 is mounted on the incidence angle measurement table 120 and on the rotation stage pedestal 35 mounted on both sides of the camera unit 5. That is, the rotation stage 30 is positioned on both left and right sides of the camera unit 5, so that the circuit board support 70 mounted on the rotation stage 30 is also located on both left and right sides of the camera unit 5, respectively. The printed circuit board 80 mounted on the substrate support 70 is also located at both left and right sides of the camera unit 5, respectively. The rotation stage 30 can be rotated to adjust the predetermined angle of incidence of the LED, so that the offset of the rotation stage 30 is adjusted so that the angle of incidence of the LED 20 is perpendicular to the irradiation surface. Here, the printed circuit board 80 is positioned on each rotation stage 30 to rotate the printed circuit board in the range of 0 ° to 90 ° so that the incident angle of the LED can be adjusted.

The rotating stage pedestal 35 is mounted on both sides of the camera unit 5 on the incident angle measuring table 120, and the rotating stage 30 is mounted on the rotating stage pedestal 35. The rotating stage pedestal 35 has a rotating stage mainly coupling part (not shown) at its bottom, and the rotating stage mainly coupling part and the rotating stage main 50 are coupled to the rotating stage pedestal 35 by the incident angle measuring table ( 120) on the top. Therefore, the rotary stage pedestal 35 may move left and right along the rotary stage main 50 on the incident angle measurement table 120, and thus, the rotary stage 30 mounted on the rotary stage pedestal 35 may also rotate the main stage. It will move left and right along 50. Thus, the rotation stage 30 can be moved and the position can be adjusted according to the diameter of the outer peripheral surface of the annular light source. In other words, the angle of incidence of the LED 20 attached to the printed circuit board 80 can be adjusted by adjusting the position of the rotation stage 30.

The rotating stage main 50 is a horizontal main located on both sides of the camera unit 5 on the incident angle measuring table 120, and moves the rotating stage 30 and the rotating stage pedestal 35 to the left and right. Rotating stage mainly 50 may be composed of holes, grooves, jaws and the like coupled to the rotary stage mainly coupling portion (not shown), may also be configured as a rail. Here, the rotating stage 30 can be moved along the rotating stage mainly 50 on both sides of the camera unit 5 on the incident angle measurement table 120, so as to change the diameter of the outer circumferential surface of the annular light source 30 It can be configured to adjust the distance between 50mm ~ 200mm.

The incident angle measuring table 120 has a camera unit 5 and an LED light emitting unit 7 mounted on the upper surface thereof, and a moving stage upper portion 40 mounted on the lower surface thereof. That is, the camera pedestal 15 is mounted at the center of the upper surface of the incident angle measuring table 120, and the rotating stage pedestal is disposed on the left and right rotation stages 50 of the camera pedestal 15 on the upper surface of the incident angle measuring table 120. 35 is mounted. In addition, the center of the bottom surface of the incident angle measurement table 120 is equipped with a moving stage upper part 40, the moving stage upper part 40 is coupled to the moving stage lower part 100, the moving stage upper part 40 is the moving stage lower part It is to move back and forth along the track 105 of the (100). When the moving stage top 40 moves back and forth along the track 105, the incident angle measurement table 120 also moves back and forth.

The moving stage upper part 40 is mounted at the bottom center of the incident angle measuring table 120 and has a track coupling groove 43 at the bottom thereof. The track coupling groove 43 is coupled to the track 105 of the moving stage lower part 100, so that the moving stage upper part 40 is mounted to the moving stage lower part 100.

The moving stage lower part 100 is positioned in front of the reflector plate 110 and has a track 105 on an upper surface thereof. A track engaging groove 43 of the upper stage 40 is mounted on the track 105 so that the upper stage 40 moves back and forth toward the reflecting plate 110. Accordingly, the incident angle measuring table 120 also moves back and forth toward the reflecting plate 110. That is, the incident angle measurement table 120 is configured to provide information on the incident angle of the light emitting diodes (LEDs) which provide a uniform illuminance for the required illuminance at various focal lengths by moving and fixing the incident angle measuring table 120. The track 105 may be made like a rail. Here, the moving stage top 40 fixes the track 105 and the incident angle measurement table 120 to the incident angle of the light emitting diode (LED) to provide uniform illuminance to the required illuminance at various focal lengths ranging from 40 mm to 170 mm. Information can be measured.

The reflector 110 is positioned in front of the incident angle measurement table 120 to reflect light from the LED 20 on the printed circuit board 80 mounted on the rotating stage 30 on the incident angle measurement table 120. do. The illuminance distribution on the reflecting plate 110 is photographed by the CCD camera 10 to measure the incident angle of the LED depending on the diameter of the outer circumferential surface of the annular light source, the divergence angle of the LED, and the focal length of the optical system.

In other words, the present invention uses the CCD camera 10 to photograph the illuminance distribution on the reflector 110 to obtain a high brightness and uniform illuminance distribution. Since the angle of incidence of the LED depending on the focal length is measured, eventually, after adjusting the offset of the rotation stage 30 so that the angle of incidence of the LED 20 is perpendicular to the irradiation surface, the rotation stage mainly 50 and the LED 20 And the position of the moving stage 40, the general annular light source can be designed by pre-providing information on the required diameter of the outer circumferential surface of the annular light source, the divergence angle of the LED and the incident angle of the LED within the focal length range of the optical system. As a result, manufacturing cost is reduced and productivity is improved.

In the present invention, the LED of the incident angle measuring device of the light emitting diode for generating high brightness parallel light of the light emitting diode annular light source is a structure that can represent a symmetrically designed LED inside the annular light source, overlapping the symmetrical light emitting diode in the annular light source Illuminance distribution is 50mm ~ 200mm by quantifying only illuminance distribution on the reflecting plate by light emitting diodes (LED) symmetrically formed on the single plane using what can be simplified to illuminance distribution of symmetric light emitting diodes on single plane. The incident angle of the light emitting diode (LED) in the range of 0 ° to 90 ° of the annular light source is measured depending on the diameter of the outer circumferential surface of the annular light source in the range and the distance between the reflector plate and the light emitting diode (LED) in the range of 40 mm to 170 mm.

In addition, in the present invention, the CCD camera 10 is located at the center to flow along the camera main 60 to allow CCD cameras of various sizes, to photograph the illuminance distribution of the LED 20 on the reflector 110, and the angle of incidence The rotating stage 30 flows along the rotating stage main 50 along the left and right sides of the CCD camera 10 on the measurement table 120 to adjust its position according to the diameter of the outer circumferential surface of the annular light source. The printed circuit board 80 is positioned on the printed circuit board 80, and the printed circuit board 80 enables the LED 20 to be attached and detached to enable various characteristics of the LEDs to be analyzed, and the printed circuit board 80 includes the rotating stage 30. It can flow along the circuit board main 90 of the circuit board support 70 mounted on the) can be adjusted according to the size of the various CCD camera. The track engaging groove 43 of the moving stage upper part 40 mounted below the incident angle measuring table 120 is combined with the track 105 of the moving stage lower part 100 to connect the incident angle measuring table 120 to the track 105. By moving and fixing it, it provides information about the angle of incidence of the LED, which provides uniform illuminance to the required illuminance at various focal lengths. By analyzing the illumination profile information on the reflector 110 using the image acquired by the CCD camera 10, the diameter of the circumferential surface of the annular light source, the divergence angle of the LED and the divergence angle of the LED considered in the design of the annular light source to obtain high brightness and uniform illuminance distribution It is possible to quantify the illuminance distribution on the reflector according to the incident angle of the LED depending on the focal length of the optical system.

3 is a schematic flowchart of detecting an illuminance distribution according to an incident angle of an LED of an annular light source from an image obtained from the CCD camera of FIG. 1.

An image of the illuminance distribution on the reflector 110 is obtained from the CCD camera 10 and provided to an operation processor (not shown) such as a computer (S110). The image on the reflector 110 provided by the CCD camera 10 is 640 × 640 pixels. This uses a CCD camera of 640 x 640 pixels as an example of the CCD camera 10, which is not intended to limit the present invention.

The image on the reflector 110 of 640 × 640 pixels designates the area not including the ruler in the image symmetrically up and down about the horizontal center axis, and 10 pixels based on the left and right end pixels of the image. An area excluding ROI is defined as a region of interest (ROI) to calculate an ROI (S120).

An average illuminance profile is obtained within the ROI (S130).

The illuminance distribution according to the incident angle of the light emitting diode (LED) of the annular light source is quantified using the average illuminance profile (S140).

In other words, by acquiring an image on the reflector of 640 × 640 pixels provided by the CCD camera 10, the area not including the ruler in the image is symmetrically up and down about the horizontal center axis, and the left and right sides of the image are designated. An area excluding 10 pixels is defined as a region of interest (ROI) based on the end pixel, and the illuminance distribution according to the incident angle of the light emitting diode (LED) of the annular light source is quantified by obtaining an average illuminance profile within the region.

4 illustrates an example of an illuminance distribution graph obtained through an image and an illuminance profile analysis measured using the LED incident angle measuring device of the present invention.

4, the upper part of the moving stage 40 is moved to adjust the distance between the LED 20 and the reflector 110 to 169 mm, and the rotation stage 30 is rotated to adjust the light emitting diode (LED) incident angle to 15 °. After that, an image is acquired by using a CCD camera of 640 × 640 pixels, and is a graph obtained through illuminance profile analysis. In the graph, it can be seen that a uniform illuminance distribution is formed in a circle having a diameter of 200 pixels, that is, about 30 mm.

5 illustrates another example of an illuminance distribution graph obtained through an image and an illuminance profile analysis measured using the LED incident angle measuring device of the present invention.

FIG. 5 shows a 640 × 640 pixel CCD camera after adjusting the distance between the LED 20 and the reflector 110 to 264 mm, adjusting the incident angle of the light emitting diode (LED) to 15 ° by rotating the rotating stage 30. Image is obtained by using, and is a graph obtained through the illumination profile analysis. It can be seen from the graph that a uniform illuminance distribution is formed in a circle having a diameter of 100 pixels, that is, about 15 mm.

In this way, when the angle of incidence of the LED is adjusted to 15 °, a uniform illuminance is formed in a circle having a diameter of about 15 mm, and a single LED annular light source having an angle of incidence of 15 LEDs in an optical system having two different focal lengths is adjusted. It can be seen that it is possible to provide a uniform illuminance alone, so that it is possible to design a general annular light source, which in turn reduces manufacturing costs and improves productivity.

FIG. 6 is a plan view of the incident angle measuring apparatus of the light emitting diode of the present invention, and FIG. 7 is a front view of the incident angle measuring apparatus of the light emitting diode of FIG. 6.

6 and 7, the CCD camera is located in the center of the front of the reflector, and the camera mainly located on the bottom of the CCD camera is configured to allow the coupling part to move back and forth along the camera main and to fix the left and right sides of the CCD camera on the incident angle measuring table. Rotating stages flow along the stages of the rotating stage to adjust the position on both sides, and the circuit board support is mounted on the rotating stage, and the printed circuit board is mounted on the circuit board mainly in the circuit board support. It flows along the main road, and its height can be adjusted according to the size of various CCD cameras. The upper part of the moving stage mounted under the incident angle measuring table is combined with the track under the moving stage, so that the incident angle measuring table can be moved and fixed along the track.

The present invention is not limited to the above described and illustrated in the drawings, and of course, more modifications and variations are possible to those skilled in the art within the scope of the following claims.

As described above, the present invention provides an apparatus and a measuring method of an incident angle of a light emitting diode for generating high brightness parallel light of a light emitting diode annular light source, the diameter of the outer peripheral surface of the annular light source, the divergence angle of the light emitting diode and the focal length of the optical system The angle of incidence of the phosphorescent LED can be measured, and the illuminance distribution characteristic on the reflecting plate according to the application characteristics of the light emitting diode annular light source can be quantified to enable a general annular light source design for generating parallel light. In another aspect, the present invention provides a high-brightness light emitting diode detachable to a printed circuit board, and provides an incident angle measuring device and a measuring method of the light emitting diode to photograph the illuminance distribution on the reflecting plate using a CCD camera.

In other words, the device and the measuring method of the incident angle of the light emitting diode for generating high brightness parallel light of the light emitting diode annular light source of the present invention can be attached and detached from the printed circuit board, it is possible to analyze the characteristics of various LEDs and various industrial sites such as semiconductor For the angle of incidence of the LED depending on the diameter of the circumferential surface of the annular light source and the change of focal length of the optical system for irradiation of the collimated light required to obtain an optimal image in the optical field within the various ranges required for the examination and testing of the medical and medical diagnostics. Information is provided to enable the design of universal annular light sources, resulting in reduced manufacturing costs and increased productivity.

Claims (11)

Reflector; A CCD camera positioned in front of the reflector to photograph an illuminance distribution on the reflector; Rotating stages spaced apart from left and right sides of the CCD camera, respectively; A printed circuit board positioned on each of the rotation stages and having a light emitting diode mounted therein; And an offset angle of the light emitting diode for generating high brightness parallel light of the annular light emitting diode of the light emitting diode, wherein the offset is adjusted by rotating the rotating stage so that the incident angle of the light emitting diode is perpendicular to the irradiation surface. A CCD camera positioned at the center on the incident angle measuring table and photographing a light emitting diode illuminance distribution on a reflecting plate; Rotating stages mounted on both left and right sides of the CCD camera on the incident angle measuring table; A printed circuit board positioned above each rotation stage and having a light emitting diode mounted therein; A moving stage upper part mounted at the center of the bottom of the incident angle measuring table and having a track coupling groove at the bottom thereof; At least a moving stage having a track coupled to the track coupling groove; Incident angle measuring device of the light emitting diode, characterized in that the angle of incidence table mounted on the moving stage is moved and fixed along the track. Reflector; A CCD camera positioned in front of the reflector to photograph an illuminance distribution on the reflector; Rotating stages spaced apart from left and right sides of the CCD camera, respectively; A printed circuit board positioned on each of the rotary stages and having a light emitting diode mounted therein; And a processing processor configured to receive the image captured by the CCD camera and detect incident angle information of the light emitting diode depending on the diameter of the outer circumferential surface of the annular light source, the divergence angle of the light emitting diode, and the focal length of the optical system. An incident angle measuring device of a light emitting diode for generating high luminance parallel light of a light source. A CCD camera positioned at the center on the incident angle measuring table and photographing a light emitting diode illuminance distribution on a reflecting plate; A rotating stage unit including a rotating stage mounted at left and right sides of the CCD camera unit on the incident angle measuring table; And a printed circuit board positioned on the rotating stage of the rotating stage and configured to attach and detach a light emitting diode therein. The rotating stage unit is coupled with the rotating stage mains respectively located on both sides of the CCD camera on the incident angle measuring table 120, and the incident angle of the light emitting diodes may move from side to side along the rotating stage mains. Measuring device. The method according to any one of claims 1 to 4, The incident angle measuring device of the light emitting diode, It is further provided with a camera pedestal mounted on the center of the incidence angle measurement table, on which the camera head is located. The CCD camera has a coupling mainly on the bottom of the camera, The camera is mainly coupled to the camera unit, the CCD camera is incident angle measuring device of the light emitting diode, characterized in that the can move back and forth along the camera. The method according to any one of claims 1 to 4, The incident angle measuring device of the light emitting diode, It is further provided with a circuit board support mounted on the rotating stage and having a circuit board main therein, One side of the printed circuit board is mainly provided with a circuit board coupling portion, And the printed circuit board may be moved up and down along the circuit board by coupling the circuit board mainly coupling part with the circuit board main. The method according to any one of claims 1 to 4, The incident angle measuring device of the light emitting diode, It is equipped with a rotary stage 30 on the top of which is further provided with a rotary stage pedestal having a rotary stage mainly coupling portion, The rotating stage main coupling unit is coupled to the rotating stage main on both sides of the CCD camera on the incident angle measurement table, the light emitting diode, characterized in that the rotating stage pedestal and the rotating stage can move left and right along the rotating stage main Incident angle measuring device. The method of claim 4, wherein The incident angle measuring device of the light emitting diode, A moving stage upper part mounted at the center of the bottom of the incident angle measuring table and having a track coupling groove at the bottom thereof; Further comprising: a moving stage having a track coupled to the track coupling groove; Incident angle measuring device of the light emitting diode, characterized in that the angle of incidence table mounted on the moving stage is moved and fixed along the track. The method according to any one of claims 1 to 4, The incidence angle measuring device of the light emitting diode, characterized in that the printed circuit board is located on the rotation stage, the incident angle of the LED can be adjusted by rotating the printed circuit board in the range of 0 ° ~ 90 °. The method according to any one of claims 1 to 4, The incident angle measuring device of the light emitting diode measures an incident angle of a light emitting diode in a range of 0 ° to 90 ° of an annular light source depending on a diameter of an outer circumferential surface of an annular light source in a range of 50 mm to 200 mm and a distance between a reflector and a light emitting diode in a range of 40 mm to 170 mm. The incident angle measuring device of the light emitting diode, characterized in that. The method of claim 3, The operation processor Receiving a 640 × 640 pixel image of an illuminance distribution on a reflector from the CCD camera, The image on the received 640 × 640 pixel reflector is symmetrically designated as an area not including a ruler in the image about a horizontal center axis and 10 pixels based on the left and right end pixels of the image. A region except for is defined as a region of interest (ROI), Obtaining an average illuminance profile within the region of interest to quantify the illuminance distribution according to the incident angle of the light emitting diode of the annular light source.

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