Optical lens ghosting and stray light distribution test analysis system

Abstract

An optical lens ghosting and stray light distribution testing and analyzing system is characterized in that a camera 6 is mounted at the top of a three-dimensional moving sample table 5, two-dimensional sample rotating structures 4 are mounted on two sides of the three-dimensional moving sample table 5, and a cross wire collimation light source 1 is mounted on the rear side of the three-dimensional moving sample table 5; the circular collimation light source rotating structure 3 is installed on the lower portion of the cross wire collimation light source 1, and the circular collimation light source 2 is installed at the tail end of the circular collimation light source rotating structure 3. A light source and a sample can be rotated to required positions at will through the circular collimation light source rotating structure 3 and the two-dimensional sample rotating structure 4, and the whole 2 pi hemisphere space is covered. And lens ghosting and stray light distribution can be tested at the same time. And the high-pixel and high-dynamic-range camera 6 is suitable for large-dynamic-range signal acquisition and testing.

Description

Technical Field

[0001] The utility model relates to the technical field of optical product testing, and more specifically to an optical lens ghost and stray light distribution testing and analysis system. Background Art

[0002] At present, the phenomenon of stray light is common in optical products such as mobile phone lenses and security cameras. Stray light is mainly caused by the unwanted excess radiation on the image plane of the optical or electro-optical system entering the system through the normal incident aperture. It not only affects the imaging quality of the lens, but also affects the user experience in severe cases.

[0003] For this reason, when optical lenses are produced or shipped, stray light detection is first performed to obtain the stray light coefficient of the lens. The stray light coefficient is an important indicator for evaluating the stray light suppression performance of optical lenses. Most of the existing stray light coefficient testing methods are for forward imaging lenses such as photographic lenses. There are fewer testing methods for the stray light coefficient of reverse imaging projection lenses such as AR and VR. Either the naked eye is used for direct detection, or the testing equipment is too cumbersome and the testing process is complicated.

[0004] Therefore, there is an urgent need for a system that can simply and quickly test and analyze the ghost and stray light distribution of optical lenses. Utility Model Content

[0005] In order to solve the above problems existing in the prior art, the utility model provides an optical lens ghost and stray light distribution testing and analysis system.

[0006] The technical solution adopted by the utility model to solve its technical problems is:

[0007] A system for testing and analyzing ghost images and stray light distribution of an optical lens, the system comprises a crosshair collimated light source 1, a circular collimated light source 2, a circular collimated light source rotation structure 3, a two-dimensional sample rotation structure 4, a three-dimensional movable sample stage 5, a camera 6 and a housing 7; wherein, the camera 6 is installed on the top of the three-dimensional movable sample stage 5, the two-dimensional sample rotation structure 4 is installed on both sides of the three-dimensional movable sample stage 5, the crosshair collimated light source 1 is installed on the rear side of the three-dimensional movable sample stage 5, the circular collimated light source rotation structure 3 is installed at the bottom of the crosshair collimated light source 1, and the circular collimated light source 2 is installed at the end of the circular collimated light source rotation structure 3; the crosshair collimated light source 1, the circular collimated light source 2, the circular collimated light source rotation structure 3, the two-dimensional sample rotation structure 4, the three-dimensional movable sample stage 5 and the camera 6 are all wrapped and protected by the housing 7.

[0008] The utility model also has the following additional technical features:

[0009] As a further specific optimization of the technical solution of the utility model: the crosshair collimated light source 1 includes a first collimating lens 101, a crosshair 102, a first frosted glass 103, a first LED light source 104, a first radiator 105 and a first cooling fan 106; the first LED light source 104 is located on one side of the first radiator 105, and the first cooling fan 106 is installed on the other side of the first radiator 105, and the first cooling fan 106 and the radiator dissipate heat from the LED light source; a crosshair 102 is provided in front of the first collimating lens 101, and a first frosted glass 103 is provided in front of the crosshair 102; the first frosted glass 103 homogenizes the light emitted by the first LED light source 104 and irradiates it onto the pattern of the crosshair 102, the crosshair 102 is light-transmitting and the surrounding area is not light-transmitting, and then the light is collimated and emitted through the collimating lens to form a crosshair collimated light source, which is used for the system to adjust the focal length.

[0010] As a further specific optimization of the technical solution of the utility model: the circular collimated light source 2 includes a second collimating lens 201, a circular hole 202, a second frosted glass 203, a second LED light source 204, a second radiator 205 and a second cooling fan 206; the second LED light source 204 is located on one side of the second radiator 205, and the second cooling fan 206 is installed on the other side of the second radiator 205, and the second cooling fan 206 and the radiator dissipate heat emitted by the LED light source; a circular hole 202 is provided in front of the second collimating lens 201, and a second frosted glass 203 is provided in front of the circular hole 202; the second frosted glass 203 homogenizes the light emitted by the second LED light source 204 and irradiates it onto the pattern of the circular hole 202, the circular hole 202 is light-transmitting and the surrounding area is not light-transmitting, and then the light is collimated and emitted through the collimating lens to form a circular hole collimated light source, which is used for system testing of ghost images and stray light distribution.

[0011] As a further specific optimization of the technical solution of the utility model: the two-dimensional sample rotation structure 4 includes a motor 401, a coupling 402 and a swing arm 403; the swing arm 403 is U-shaped as a whole, and a coupling 402 is provided on one side of the swing arm 403, and a rotating rod is provided on the other side. The motor 401 drives the swing arm 403 to rotate through the coupling 402, so that the sample can rotate around the center in the front and rear directions.

[0012] As a further specific optimization of the technical solution of the utility model: the three-dimensional movable sample stage 5 includes an X-axis motor 501, a Y-axis motor 502 and a Z-axis motor 503. The X-axis motor 501 drives the Y-axis motor 502 to move in the X-axis direction through a screw rod, the Y-axis motor 5021 drives the Z-axis motor 503 to move in the Y-axis direction through a screw rod, and the Z-axis motor 503 drives the lens sample 8 to be tested to move in the Z-axis direction through a screw rod. The X-axis motor 501 and the Y-axis motor 502 can make the lens sample 8 to be tested aligned with the light source in the X direction and the Y direction, and the Z-axis motor 503 is used for focusing the camera 6 and the lens sample 8 to be tested.

[0013] As a further specific optimization of the technical solution of the utility model: the cross-hair collimated light source 1 is imaged on the camera 6 after passing through the lens to be tested, and the distance between the camera 6 and the lens to be tested is adjusted by the three-dimensional movable sample stage 5 to perform automatic focusing; the circular collimated light source 2 can be a halogen lamp or an LED light source, and this light source is rotated by the circular collimated light source rotating structure 3 to provide parallel light required in the test process; the circular collimated light source rotating structure 3 can rotate the circular collimated light source 2 to the required test position; the two-dimensional sample rotating structure 4 can rotate the rotating sample and the camera 6 to the required test position; the three-dimensional movable sample stage 5 is used to adjust the distance between the camera 6 and the sample to be tested to achieve automatic focusing; the camera 6 forms an image after the light passes through the lens to be tested.

[0014] As a further specific optimization of the technical solution of the utility model: the shell 7 is used to protect the internal cross-hair collimated light source 1, the circular collimated light source 2, the circular collimated light source rotation structure 3, the two-dimensional sample rotation structure 4, the three-dimensional mobile sample stage 5 and the camera 6 and provide a darkroom environment.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] The circular collimated light source rotating structure 3 and the two-dimensional sample rotating structure 4 allow the light source and sample to be rotated to any desired position, covering the entire 2π hemisphere space. The lens ghost image and stray light distribution can be tested simultaneously. The high-pixel and high-dynamic range camera 6 is suitable for large dynamic range signal acquisition testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of the distributed test and analysis system of the utility model;

[0018] Figure 2 This is a schematic diagram of the distributed test and analysis system model structure of the utility model;

[0019] Figure 3 This is a test structure diagram of the distributed test analysis system of the utility model;

[0020] Figure 4 It is a schematic diagram of the structure of the crosshair collimated light source 1 of the utility model;

[0021] Figure 5 This is a schematic diagram of the structure of a circular collimated light source 2 of the utility model;

[0022] Figure 6 It is a structural schematic diagram of a two-dimensional sample rotation structure 4 of the utility model;

[0023] Figure 7 It is a schematic diagram of the structure of the three-dimensional movable sample stage 5 of the utility model.

[0024] Explanation of the reference numerals: crosshair collimated light source 1, circular collimated light source 2, circular collimated light source rotating structure 3, two-dimensional sample rotating structure 4, three-dimensional movable sample stage 5, camera 6 and housing 7, sample 8. DETAILED DESCRIPTION

[0025] Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings.

[0026] Example 1

[0027] The optical lens ghost and stray light distribution test and analysis system has the main function of online testing of the optical lens ghost and stray light distribution; the distribution test and analysis system uses collimated parallel light to incident at different angles, and the camera system of camera 6 captures the imaging of the lens to be tested, uses software algorithms to identify the ghost position in the imaging, and calculates the maximum stray light signal in the field of view of the lens to be tested, thereby obtaining the angular distribution of the stray light.

[0028] The system includes a crosshair collimated light source 1, a circular collimated light source 2, a circular collimated light source rotation structure 3, a two-dimensional sample rotation structure 4, a three-dimensional movable sample stage 5, a camera 6 and a housing 7; wherein, the camera 6 is installed on the top of the three-dimensional movable sample stage 5, the two-dimensional sample rotation structure 4 is installed on both sides of the three-dimensional movable sample stage 5, the crosshair collimated light source 1 is installed on the back side of the three-dimensional movable sample stage 5, the circular collimated light source rotation structure 3 is installed at the bottom of the crosshair collimated light source 1, and the circular collimated light source 2 is installed at the end of the circular collimated light source rotation structure 3; the crosshair collimated light source 1, the circular collimated light source 2, the circular collimated light source rotation structure 3, the two-dimensional sample rotation structure 4, the three-dimensional movable sample stage 5 and the camera 6 are all wrapped and protected by the housing 7.

[0029] The crosshair collimated light source 1 is imaged on the camera 6 after passing through the lens to be tested, and the distance between the camera 6 and the lens to be tested is adjusted by the three-dimensional movable sample stage 5 to perform automatic focusing. The circular collimated light source 2 can be a halogen lamp or an LED light source, and this light source is rotated by the circular collimated light source rotating structure 3 to provide parallel light required during the test. The circular collimated light source rotating structure 3 can rotate the circular collimated light source 2 to the required test position. The two-dimensional sample rotating structure 4 can rotate the rotating sample and the camera 6 to the required test position. The three-dimensional movable sample stage 5 is used to adjust the distance between the camera 6 and the sample to be tested to achieve automatic focusing. The camera 6 forms an image after the light passes through the lens to be tested. The housing 7 is used to protect the internal crosshair collimated light source 1, the circular collimated light source 2, the circular collimated light source rotating structure 3, the two-dimensional sample rotating structure 4, the three-dimensional movable sample stage 5 and the camera 6 and provide a darkroom environment.

[0030] The crosshair collimated light source 1 comprises a first collimating lens 101, a crosshair 102, a first frosted glass 103, a first LED light source 104, a first radiator 105 and a first cooling fan 106; the first LED light source 104 is located on one side of the first radiator 105, and the first cooling fan 106 is installed on the other side of the first radiator 105, and the first cooling fan 106 and the radiator dissipate heat from the LED light source; a crosshair 102 is arranged in front of the first collimating lens 101, and a first frosted glass 103 is arranged in front of the crosshair 102; the first frosted glass 103 homogenizes the light emitted by the first LED light source 104 and irradiates it onto the pattern of the crosshair 102, the crosshair 102 is light-transmitting and the surrounding area is not light-transmitting, and then the light is collimated and emitted through the collimating lens to form a crosshair collimated light source, which is used for the system to adjust the focal length.

[0031] The circular collimated light source 2 includes a second collimating lens 201, a circular hole 202, a second frosted glass 203, a second LED light source 204, a second radiator 205 and a second cooling fan 206; the second LED light source 204 is located on one side of the second radiator 205, and the second cooling fan 206 is installed on the other side of the second radiator 205, and the second cooling fan 206 and the radiator dissipate heat emitted by the LED light source; a circular hole 202 is provided in front of the second collimating lens 201, and a second frosted glass 203 is provided in front of the circular hole 202; the second frosted glass 203 homogenizes the light emitted by the second LED light source 204 and irradiates it onto the pattern of the circular hole 202, the circular hole 202 is light-transmitting and the surrounding area is not light-transmitting, and then the light is collimated and emitted through the collimating lens to form a circular hole collimated light source, which is used for system testing of ghost images and stray light distribution.

[0032] The two-dimensional sample rotation structure 4 includes a motor 401, a coupling 402 and a swing arm 403; the swing arm 403 is generally U-shaped, with a coupling 402 on one side of the swing arm 403 and a rotating rod on the other side. The motor 401 drives the swing arm 403 to rotate through the coupling 402, so that the sample can rotate around the center in the front and rear directions.

[0033] The three-dimensional movable sample stage 5 includes an X-axis motor 501, a Y-axis motor 502 and a Z-axis motor 503. The X-axis motor 501 drives the Y-axis motor 502 to move in the X-axis direction through a screw rod. The Y-axis motor 5021 drives the Z-axis motor 503 to move in the Y-axis direction through a screw rod. The Z-axis motor 503 drives the lens sample 8 to be tested to move in the Z-axis direction through a screw rod. The X-axis motor 501 and the Y-axis motor 502 can align the lens sample 8 to be tested with the light source in the X-direction and the Y-direction. The Z-axis motor 503 is used for focusing the camera 6 and the lens sample 8 to be tested.

[0034] Example 2

[0035] The operation method of the optical lens ghost and stray light distribution test and analysis system includes:

[0036] When measuring the stray light distribution online, place the sample in the position to be measured; the software controls the removal of the collimated light source, lights up the crosshair collimated light source 1, and automatically adjusts the position of the camera 6, adjusts the focal length between the camera 6 and the lens, so that the crosshairs are clearly imaged, and performs measurement after alignment and focusing; rotates the collimated light source to the 0° position, and automatically collects the reference light source; rotates the collimated light source to different angles, lights up the collimated light source respectively, and uses the camera 6 to take images; the software analyzes the stray light conditions at different angles, identifies the ghost position, and draws the stray light distribution curve.

[0037] When measuring the ghost distribution online, the circular collimated light source 2 is moved to the position to be measured by adjusting the circular collimated light source rotating structure 3. After lighting, the high-resolution, high-dynamic range color camera 6 is used to collect the image of the circular collimated light source 2 after passing through the lens to be tested; the imaging picture is analyzed by the software algorithm to obtain the maximum stray light situation at each position, and the stray light distribution curve is drawn; a high-pixel high-dynamic range camera 6 is used during the test to meet the signal acquisition of a large dynamic range; the three-dimensional mobile sample stage 5 adopts an automatic focus method to facilitate operation on the production line; by adding a crosshair collimated light source 1 just above the 0° position, the camera 6 automatically focuses through the three-dimensional mobile sample stage 5 through image recognition, and measures after positioning. After the test is completed, the sample is replaced and the next sample is measured.

[0038] Embodiment 2 can automate design, auto-focus, auto-control, auto-collect pictures, auto-recognize and calculate, and obtain test results by one-click measurement.

[0039] The above detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention but merely represents selected embodiments of the present invention.

Claims

1. An optical lens ghost and stray light distribution test and analysis system, characterized by: The system comprises a crosshair collimated light source (1), a circular collimated light source (2), a circular collimated light source rotating structure (3), a two-dimensional sample rotating structure (4), a three-dimensional movable sample stage (5), a camera (6) and a housing (7); wherein the camera (6) is installed on the top of the three-dimensional movable sample stage (5), the two-dimensional sample rotating structure (4) is installed on both sides of the three-dimensional movable sample stage (5), the crosshair collimated light source (1) is installed on the rear side of the three-dimensional movable sample stage (5), the circular collimated light source rotating structure (3) is installed at the bottom of the crosshair collimated light source (1), and the circular collimated light source (2) is installed at the end of the circular collimated light source rotating structure (3); the crosshair collimated light source (1), the circular collimated light source (2), the circular collimated light source rotating structure (3), the two-dimensional sample rotating structure (4), the three-dimensional movable sample stage (5) and the camera (6) are all wrapped and protected by the housing (7).

2. The optical lens ghost and stray light distribution test and analysis system according to claim 1, characterized in that: The crosshair collimated light source (1) comprises a first collimating lens (101), a crosshair (102), a first frosted glass (103), a first LED light source (104), a first heat sink (105) and a first cooling fan (106); the first LED light source (104) is located on one side of the first heat sink (105), the first cooling fan (106) is installed on the other side of the first heat sink (105), and the first cooling fan (106) and the heat sink are connected to the first collimated light source (101). The heat emitted by the LED light source is dissipated; a crosshair (102) is arranged in front of the first collimating lens (101), and a first frosted glass (103) is arranged in front of the crosshair (102); the first frosted glass (103) evens out the light emitted by the first LED light source (104), and irradiates the light onto the pattern of the crosshair (102); the crosshair (102) is light-transmissive and the surrounding area is light-impermeable, and then the light is collimated and emitted through the collimating lens to form a crosshair collimated light source, which is used for the system to adjust the focal length.

3. The optical lens ghost and stray light distribution test and analysis system according to claim 1, characterized in that: The circular collimated light source (2) comprises a second collimating lens (201), a circular hole (202), a second frosted glass (203), a second LED light source (204), a second heat sink (205) and a second cooling fan (206); the second LED light source (204) is located on one side of the second heat sink (205), the second cooling fan (206) is installed on the other side of the second heat sink (205), and the second cooling fan (206) and the heat sink dissipate heat emitted by the LED light source; a circular hole (202) is arranged in front of the second collimating lens (201), and a second frosted glass (203) is arranged in front of the circular hole (202); the second frosted glass (203) homogenizes the light emitted by the second LED light source (204) and irradiates it onto the pattern of the circular hole (202); the circular hole (202) is light-transmitting and the surrounding area is light-impermeable, and then the light is collimated and emitted through the collimating lens to form a circular hole collimated light source, which is used for system testing of ghost images and stray light distribution.

4. The optical lens ghost and stray light distribution test and analysis system according to claim 1, characterized in that: The two-dimensional sample rotation structure (4) comprises a motor (401), a coupling (402) and a swing arm (403); the swing arm (403) is generally U-shaped, one side of the swing arm (403) is provided with a coupling (402), and the other side is provided with a rotating rod, and the motor (401) drives the swing arm (403) to rotate through the coupling (402), so that the sample can rotate around the center in the front-rear direction.

5. The optical lens ghost and stray light distribution test and analysis system according to claim 1, characterized in that: The three-dimensional movable sample stage (5) comprises an X-axis motor (501), a Y-axis motor (502) and a Z-axis motor (503); the X-axis motor (501) drives the Y-axis motor (502) to move in the X-axis direction via a screw rod; the Y-axis motor (5021) drives the Z-axis motor (503) to move in the Y-axis direction via a screw rod; the Z-axis motor (503) drives the lens sample (8) to be tested to move in the Z-axis direction via a screw rod; the X-axis motor (501) and the Y-axis motor (502) can align the lens sample (8) to be tested with a light source in the X-direction and the Y-direction; the Z-axis motor (503) is used for focusing the camera (6) and the lens sample (8) to be tested.

6. The optical lens ghost and stray light distribution test and analysis system according to claim 1, characterized in that: The crosshair collimated light source (1) is imaged on the camera (6) after passing through the lens to be tested, and the distance between the camera (6) and the lens to be tested is adjusted by a three-dimensional movable sample stage (5) to perform automatic focusing; the circular collimated light source (2) can be a halogen lamp or an LED light source, and the circular collimated light source rotating structure (3) is used to rotate the light source to provide parallel light required during the test; the circular collimated light source rotating structure (3) can rotate the circular collimated light source (2) to a required test position; the two-dimensional sample rotating structure (4) can rotate the rotating sample and the camera (6) to a required test position; The three-dimensional movable sample stage (5) is used to adjust the distance between the camera (6) and the sample to be tested to achieve automatic focusing; the camera (6) forms an image after the light passes through the lens to be tested.

7. The optical lens ghost and stray light distribution test and analysis system according to claim 1, characterized in that: The housing (7) is used to protect the crosshair collimated light source (1), the circular collimated light source (2), the circular collimated light source rotating structure (3), the two-dimensional sample rotating structure (4), the three-dimensional movable sample stage (5) and the camera (6) inside, and to provide a darkroom environment.

Images