Large-view-field lens stray light test equipment for production line
By designing a lens stray light testing equipment for production line combining a large field of view and a light trap integration sphere, the lens stray light testing problem in the prior art is solved, and high-accuracy stray light testing is achieved, which meets relevant standards and is suitable for production line use.
Patent Information
- Application Number
- CN202420718507.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-09
- Publication Date
- 2025-03-18
- Estimated Expiration
- 2034-04-09
AI Technical Summary
The prior art is difficult to effectively test stray light in lenses, resulting in a decrease in image contrast and affecting optical performance.
A large field of view lens stray light testing equipment for production lines was designed, using a large field of view, a main integral sphere, a light trap integral sphere, an LED light source, a test CCD camera, a rotating platform, a liftable bracket and a replaceable aperture insert. Through the combination of uniform illumination of the integral sphere and a large-size black light trap, high brightness contrast testing is achieved.
It realizes stray light testing of large field of view lenses and contrast ratios of different angles, ensures the accuracy of the test results, complies with GB/T10988 standards, and allows customers to conduct stray light testing and inspection on their own on the production line.
Smart Images
Figure CN222635754U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of lens stray light testing equipment, in particular to a large-field-of-view lens stray light testing equipment for a production line. Background Art
[0002] The image information received by the imaging surface of the optical system does not only come from the image itself, but also includes the stray light generated by the lens and the camera body itself. Stray light will cause the contrast of the image to decrease, and put forward higher requirements on the optical performance of the lens, lens and imaging equipment. Therefore, a large field of view lens stray light test equipment for production lines is needed. Utility Model Content
[0003] In order to solve the problems existing in the above-mentioned prior art, the utility model provides a stray light testing device for a large field of view lens for a production line.
[0004] The technical solution adopted by the utility model to solve its technical problems is:
[0005] A stray light testing device for a large-field-of-view lens for a production line: comprising a main integrating sphere 1 with a large-field-of-view uniform light source, a light trap integrating sphere 2, an LED light source 3, a CCD camera 4 for testing, a rotating platform 5, a liftable bracket 6, a replaceable aperture insert 7, and a fixed frame 8; wherein: the light trap integrating sphere 2 is mounted on the top of the fixed frame 8, the main integrating sphere 1 is mounted on the middle of the fixed frame 8, and the liftable bracket 6 is mounted on the bottom of the fixed frame 8; a replaceable aperture insert 7 is arranged between the light trap integrating sphere 2 and the main integrating sphere 1; a plurality of LED light sources 3 are evenly mounted and fixed on the outer side of the bottom of the main integrating sphere 1; a test sample 9 is mounted and fixed on the bottom of the main integrating sphere 1; a rotating platform 5 is mounted and fixed on the top of the liftable bracket 6, and a CCD camera 4 for testing is mounted and fixed on the rotating platform 5.
[0006] The utility model also has the following additional technical features:
[0007] As a further specific optimization of the technical solution of the utility model: the main integrating sphere 1 with a large field of view and uniform light source is used to provide a uniform flat field and a sufficient field of view.
[0008] As a further specific optimization of the technical solution of the utility model: the light trap integrating sphere 2 is used to provide a sufficiently black spot to form a higher black-white brightness contrast with the flat field.
[0009] As a further specific optimization of the technical solution of the utility model: the LED light source 3 is used to provide flat-field illumination; according to the lens and test requirements, a wide-spectrum or narrow-band light source can be selected, or a visible light or infrared light source can be selected.
[0010] As a further specific optimization of the technical solution of the utility model: the test CCD camera 4 is a large dynamic range camera, which is used to take brightness contrast pictures and calculate the stray light coefficient through the pictures.
[0011] As a further specific optimization of the technical solution of the utility model: the rotating platform 5 is used to provide rotation for the camera when collecting flat-field pictures.
[0012] As a further specific optimization of the technical solution of the utility model: the liftable bracket 6 is used to lift the bracket during testing to send the camera and the test lens into the integrating sphere, and to lower the bracket after the test to replace the sample.
[0013] As a further specific optimization of the technical solution of the utility model: the replaceable aperture multi-insert 7 provides black spots with different apertures according to the field of view range of the test lens.
[0014] Compared with the prior art, the utility model has the following advantages:
[0015] This utility model is a stray light test equipment for large field of view lenses for production lines. It is designed for testing the stray light coefficient of lenses. The system meets the testing requirements of GB / T10988 standard, and can enable customers to test and inspect the products on the production line. The system uses an integrating sphere with uniform illumination and a large-size black light trap to achieve a high brightness contrast and ensure the accuracy of the test results. The patented large field of view uniform light source structure can test the stray light of lenses with large fields of view and different angles of contrast. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 This is a schematic diagram of the structure of the stray light testing equipment of the utility model;
[0017] Figure 2 It is a schematic diagram of the testing process of the stray light testing equipment of the utility model;
[0018] Figure 3 It is a schematic diagram of the installation structure of the replaceable aperture insert 7 of the utility model.
[0019] Explanation of reference numerals: main integrating sphere with large field of view and uniform light source 1; light trap integrating sphere 2; LED light source 3; CCD camera for testing 4; rotating platform 5; liftable bracket 6; replaceable aperture insert 7, fixed frame 8, test sample 9, card slot 10. DETAILED DESCRIPTION
[0020] Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings.
[0021] Example 1
[0022] A stray light testing device for a large-field-of-view lens for a production line comprises a main integrating sphere 1 with a large-field-of-view uniform light source, a light trap integrating sphere 2, an LED light source 3, a CCD camera 4 for testing, a rotating platform 5, a liftable bracket 6, a replaceable aperture insert 7, and a fixed frame 8; wherein: the light trap integrating sphere 2 is mounted on the top of the fixed frame 8, the main integrating sphere 1 is mounted on the middle of the fixed frame 8, and the liftable bracket 6 is mounted on the bottom of the fixed frame 8; a replaceable aperture insert 7 is arranged between the light trap integrating sphere 2 and the main integrating sphere 1; a plurality of LED light sources 3 are evenly mounted and fixed on the outer side of the bottom of the main integrating sphere 1; a test sample 9 is mounted and fixed on the bottom of the main integrating sphere 1; a rotating platform 5 is mounted and fixed on the top of the liftable bracket 6, and a CCD camera 4 for testing is mounted and fixed on the rotating platform 5.
[0023] The main integrating sphere 1 with a large field of view and uniform light source is used to provide a uniform flat field and a sufficient field of view. The light trap integrating sphere 2 is used to provide a sufficiently dark black spot to form a high black-white brightness contrast with the flat field. The dual integrating sphere structure of the main integrating sphere 1 with a large field of view and uniform light source and the light trap integrating sphere 2 achieves a high light-dark contrast.
[0024] LED light source 3 is used to provide flat field illumination, and LED light source 3 can realize visible and near-infrared light source illumination. According to the lens and test requirements, a wide spectrum or narrow band light source can be selected, or a visible light or infrared light source can be selected. The CCD camera 4 for testing is a large dynamic range camera, which is used to take brightness contrast pictures, and calculate the stray light coefficient through the pictures to ensure the test accuracy. The rotating platform 5 is used to provide rotation for the camera when collecting flat field pictures. The liftable bracket 6 is used to lift the bracket during testing, send the camera and test lens into the integrating sphere, and lower the bracket after the test to replace the sample. The replaceable aperture multi-insert 7 provides different aperture black spots according to the field of view of the test lens.
[0025] In actual use, the CCD camera used is ACA2440-20GC produced by Basler. The rotating platform is driven by a motor to rotate the turntable. The lifting bracket is driven by a motor to drive the upper slider of the lead screw to achieve up and down one-dimensional movement. The aperture insert is a round hole on the iron plate. According to the test needs, multiple iron plates are made and round holes of different apertures are opened on them. A slot is provided between the main integrating sphere and the light trap integrating sphere. The aperture insert 7 can be manually inserted into the slot 10, and the aperture insert can be manually replaced to achieve black round spots of different apertures.
[0026] Example 2
[0027] The testing process of the stray light test equipment for large field of view lenses for production lines:
[0028] Step 1: Turn on the main integrating sphere light source and adjust the brightness of the light source. Step 2: Use the detector to read the brightness of the light source. Step 3: Rotate the camera with the lens sample to face the uniform sphere wall. Step 4: After adjusting the gain and exposure time, obtain a flat field image for flat field correction. Step 5: When testing the stray light coefficient, the sample and the camera rise together, and the sample is located at the opening of the main integrating sphere. Step 6: Light up the light source at the same brightness and use the detector to confirm the brightness of the light source again. Step 7: Use the same gain and exposure time to take pictures of the light spots of the main integrating sphere and the light trap. Step 8: Call the flat field correction, and the software performs analysis and calculation to obtain the stray light coefficient.
[0029] 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. A stray light testing device for a large field of view lens for a production line, characterized by: The invention comprises a main integrating sphere (1) with a large field of view uniform light source, a light trap integrating sphere (2), an LED light source (3), a CCD camera for testing (4), a rotating platform (5), a liftable bracket (6), a replaceable aperture insert (7), and a fixed frame (8); wherein: the light trap integrating sphere (2) is mounted on the top of the fixed frame (8), the main integrating sphere (1) is mounted on the middle of the fixed frame (8), and the liftable bracket (6) is mounted on the bottom of the fixed frame (8); a replaceable aperture insert (7) is arranged between the light trap integrating sphere (2) and the main integrating sphere (1); a plurality of LED light sources (3) are uniformly fixedly mounted on the outer side of the bottom of the main integrating sphere; a test sample (9) is fixedly mounted on the bottom of the main integrating sphere; a rotating platform (5) is fixedly mounted on the top of the liftable bracket (6), and a CCD camera for testing (4) is fixedly mounted on the rotating platform (5).
2. The stray light testing equipment for a large field of view lens for a production line according to claim 1, characterized in that: The LED light source (3) can be a broad spectrum or narrow band light source.
3. The stray light testing equipment for a large field of view lens for a production line according to claim 1, characterized in that: The CCD camera (4) used for testing is a camera with a large dynamic range.
4. The stray light testing equipment for a large field of view lens for a production line according to claim 1, characterized in that: The replaceable aperture multi-insert piece (7) provides black spots with different apertures according to the field of view range of the test lens.