Camera out-of-focus testing machine

Abstract

The utility model provides a camera out-of-focus testing machine which comprises an opening and closing door, a rack, a feeding and discharging mechanism, a temperature control box, a jig, a cover plate, a relay lens and a chart plate. According to the utility model, the rack and the feeding and discharging mechanism are arranged, when the camera needs to be detected, only the temperature control box needs to be moved out through the feeding and discharging mechanism, then the camera is installed in the temperature control box, then the temperature control box is reset, the camera is aligned with the relay lens, and then the temperature in the temperature control box is regulated and controlled; the camera starts to carry out a defocus test; according to the utility model, parts for testing are installed inside the rack, so that the parts are isolated from the external environment, and the detection quality of the camera in the detection process is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of testing equipment, in particular to a camera defocus testing machine. Background Art

[0002] With the advancement of intelligent assisted driving and autonomous driving technologies in the automotive industry, onboard cameras are fundamental to enabling numerous ADAS features such as warning and recognition, serving as the intelligent eyes of intelligent vehicles. A camera's structure primarily consists of two components: a lens and an image sensor. These components are subject to thermal expansion and contraction due to temperature fluctuations, thus affecting the camera's resolution. Because cameras are mounted on vehicles, they are subject to both low and high temperatures. Therefore, ensuring their proper function in these environments requires rigorous testing to ensure reliability. Existing camera testing systems, such as those disclosed in patent application number 201921080556.0, expose most components to the external environment, making them susceptible to external influences during testing. Utility Model Content

[0003] The purpose of the present invention is to design a camera defocus tester to solve the problems raised in the background art. To achieve the above purpose, the present invention provides the following technical solution: it includes a frame with an opening and closing door, a material loading and unloading mechanism installed at the bottom of the frame, and a temperature control box fixed to the top of the material loading and unloading mechanism. The camera is installed inside the temperature control box via a fixture. The top of the temperature control box is provided with a cover with a transparent window. The axis of the fixture is aligned with the axis of the relay mirror fixed to the bottom of the test system. The test system includes a chart board that can move up and down, and the camera is aligned with the chart board.

[0004] Furthermore, the test system further includes a lifting mechanism for driving the chart to move up and down and a support frame fixed to the inside of the rack, and the lifting mechanism is installed on the support frame.

[0005] Furthermore, the rack is provided with an electrical installation chamber, and the electronic components for controlling the temperature control box and the lifting mechanism are all installed in the electrical installation chamber.

[0006] Furthermore, the feeding and discharging mechanism includes a Y-axis moving mechanism slidably connected to the bottom of the frame, a Z-axis moving mechanism fixed to the output plate of the Y-axis moving mechanism, and an X-axis moving mechanism fixed to the output plate of the Z-axis moving mechanism, and the temperature control box is fixed to the output plate of the X-axis moving mechanism.

[0007] Furthermore, the Y-axis moving mechanism includes a slide rail fixed to the bottom of the frame, a slider slidably connected to the slide rail, and a moving plate fixed to the top of the slider, and the Z-axis moving mechanism is fixed to the moving plate.

[0008] Furthermore, a handle is provided on the movable plate, and the handle is aligned with the opening and closing door.

[0009] Furthermore, the Z-axis moving mechanism adopts a Z-axis linear translation stage.

[0010] Furthermore, the X-axis moving mechanism adopts a precision cross slide.

[0011] Furthermore, a leveling component is provided on the output plate of the X-axis moving mechanism, and the leveling component includes

[0012] Furthermore, a fixing plate is provided on a side wall of the movable plate close to the electrical installation chamber, and the fixing plate is fixed to one end of the drag chain.

[0013] Furthermore, the slide rail is fixedly connected to the bottom of the frame through a connecting plate, a positioning block is fixedly connected to the end of the connecting plate facing away from the opening and closing door, the end face of the movable plate is tightly attached to the end face of the positioning block, a limit sensor is fixedly connected to the positioning block, a limit plate is fixedly connected to a side wall of the movable plate facing away from the opening and closing door, and a locking mechanism for locking the limit plate is also fixedly connected to the end of the connecting plate facing away from the opening and closing door, and the locking mechanism is connected to the limit sensor.

[0014] Furthermore, the locking mechanism includes a guide mounting plate fixed to the connecting plate, a cylinder fixed to the guide mounting plate, and a limit pin fixed to the output end of the cylinder. A limit hole is provided on the limit plate, the limit pin passes through the limit hole, and the cylinder is connected to the limit sensor through a controller.

[0015] Furthermore, a guide block is fixed to the middle of the guide mounting plate, the limit pin is clearance-matched with the guide block, the limit pin passes through the guide block and the bottom of the limit pin is connected to the output end of the cylinder.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The utility model is provided with a frame and a feeding and discharging mechanism. When the camera needs to be tested, it is only necessary to move the temperature control box out through the feeding and discharging mechanism, and then install the camera inside the temperature control box. Then, the temperature control box is reset, and the camera is aligned with the relay mirror. Then, the temperature inside the temperature control box is controlled, and the camera starts to perform a defocus test. Therefore, the utility model installs the test components inside the frame, thereby isolating them from the external environment, thereby ensuring the detection quality of the camera during the detection process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0020] Figure 2 This is a partial cross-sectional diagram of the temperature control box after it is hidden;

[0021] Figure 3 It is the overall structural diagram of the temperature control box;

[0022] Figure 4 It is a partially enlarged schematic diagram of the present invention.

[0023] Among them: 1. Rack; 2. Opening and closing door; 3. Electrical installation chamber; 4. Cover; 5. Camera; 6. Temperature control box; 7. Fixture; 8. Transparent window; 9. Lifting mechanism; 10. Test system; 11. Relay mirror; 12. Support frame; 13. Feeding and unloading mechanism; 14. Handle; 15. Z-axis moving mechanism; 16. Slider; 17. Moving plate; 18. Slide rail; 19. Connecting plate; 20. Positioning block; 21. Limit sensor; 22. Guide mounting plate; 23. Guide block; 24. Limit pin; 25. Drag chain; 26. Limit plate; 27. X-axis moving mechanism; 28. Fixed plate. DETAILED DESCRIPTION

[0024] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the following is a detailed description of the specific implementation method, structure, characteristics and effects of the present invention in combination with the accompanying drawings and preferred embodiments.

[0025] Example: Please refer to Figure 1-4A camera defocus tester includes a frame 1 with an opening and closing door 2, an inlet and outlet mechanism 13 installed at the bottom of the frame 1, and a temperature control box 6 fixed to the top of the inlet and outlet mechanism 13. A camera 5 is installed inside the temperature control box 6 through a fixture 7. The top of the temperature control box 6 is provided with a cover 4 with a transparent window 8. The axis of the fixture 7 is aligned with the axis of the relay mirror 11 fixed to the bottom of the test system 10. The test system 10 includes a chart board that can be moved up and down. The camera 5 is aligned with the chart board. 6 is connected to the temperature control system to control the temperature inside the temperature control box 6, which is relatively conventional and will not be described in detail here; and the way in which the camera 5 is installed on the fixture 7 is achieved by pressing the camera 5 with the fixture 7 bottom plate and the fixture 7 flip cover, which is relatively conventional and will not be described in detail here; when the camera 5 needs to be tested, the opening and closing door 2 is opened first, and then the temperature control box 6 is moved to the opening and closing door 2 through the feeding and discharging mechanism 13, and then the cover 4 is opened, and the camera 5 is installed in the temperature control box 6 through the fixture 7, and then the cover The upper cover 4 aligns the camera 5 with the relay lens 11 through the feeding and discharging mechanism 13, and then the temperature control system controls the temperature inside the temperature control box 6 to the test temperature, and then the camera 5 is powered on and takes pictures to take pictures; wherein, the chart plate is lifted and lowered during this process, that is, the chart will lift and lower, thereby changing the clarity of the camera 5, that is, the motion simulation object distance changes from near to far, and the clarity is captured at multiple object distances, and an MTF value is obtained according to the clarity value of the chart, and a clarity curve is obtained by continuously collecting multiple MTF values, and the peak position of the clarity curve is obtained to obtain the object distance corresponding to the clearest time; thereby, the image distance corresponding to the clearest time is obtained from the working height relationship of the chart, and then the image distance is compared with the focal length to obtain the defocus amount, and then the change in the influence of the external temperature change on the camera 5 is obtained; therefore, the present invention installs the test components inside the frame 1, thereby isolating them from the external environment, and ensuring the detection quality of the camera 5 during the detection process.

[0026] In this embodiment, the test system 10 also includes a lifting mechanism 9 for driving the chart plate to move up and down and a support frame 12 fixed to the inside of the frame 1, the lifting mechanism 9 is installed on the support frame 12, wherein the lifting mechanism 9 can adopt a screw nut mechanism, wherein the chart plate is connected to the screw nut seat in the screw nut mechanism, and when the screw rotates, the chart plate can be moved up and down; and the frame 1 is provided with an electrical installation chamber 3, and the electronic components of the temperature control box 6, the feeding and discharging mechanism 13 and the lifting mechanism 9 are all installed in the electrical installation chamber 3, thereby realizing the control of the temperature of the temperature control box 6 and the opening of the lifting mechanism 9; and the feeding and discharging mechanism 13 includes a bottom portion connected to the frame 1. The Y-axis moving mechanism is slidably connected, the Z-axis moving mechanism 15 is fixed on the output plate of the Y-axis moving mechanism, and the X-axis moving mechanism 27 is fixed on the output plate of the Z-axis moving mechanism 15. The temperature control box 6 is fixed on the output plate of the X-axis moving mechanism 27, thereby realizing the movement of the temperature control box 6. The Y-axis moving mechanism includes a slide rail 18 fixed to the bottom of the frame 1, a slider 16 slidably connected to the slide rail 18, and a moving plate 17 fixed to the top of the slider 16. The Z-axis moving mechanism 15 is fixed on the moving plate 17. A handle 14 is provided on the moving plate 17. The handle 14 is aligned with the opening and closing door 2. When it is necessary to move out the temperature control box 6, it is only necessary to pull the handle 14 to pull the moving plate 17 to move. Thereby, the temperature control box 6 is moved out; in addition, the Z-axis moving mechanism 15 adopts a common Z-axis linear translation table, and the X-axis moving mechanism 27 adopts a common precision cross slide, which will not be described in detail here; in addition, a fixed plate 28 is provided on the side wall of the moving plate 17 close to the electrical installation chamber 3, and the fixed plate 28 is fixed to one end of the drag chain 25 to facilitate the aggregation of the wires of the temperature control box 6; and the slide rail 18 is fixed to the bottom of the frame 1 through the connecting plate 19, and the end of the connecting plate 19 facing away from the closing door 2 is fixed with a positioning block 20, the end face of the moving plate 17 is in close contact with the end face of the positioning block 20, the positioning block 20 is fixed with a limit sensor 21, and the moving plate 17 is fixed on the side wall facing away from the closing door 2 The limit plate 26 and the end of the connecting plate 19 facing away from the closing door 2 are also fixed with a locking mechanism for locking the limit plate 26. The locking mechanism is connected to the limit sensor 21. The locking mechanism includes a guide mounting plate 22 fixed to the connecting plate 19, a cylinder fixed to the guide mounting plate 22, and a limit pin 24 fixed to the output end of the cylinder. A limit hole is provided on the limit plate 26, and the limit pin 24 passes through the limit hole. The cylinder is connected to the limit sensor 21 through a controller. When the movable plate 17 touches the limit sensor 21, the limit sensor 21 will send a signal to the controller, and the controller will control the cylinder to start, so that the limit pin 24 extends and passes through the limit hole, thereby achieving locking of the movable plate 17.A guide block 23 is fixed to the middle of the guide mounting plate 22. A limit pin 24 is loosely fitted with the guide block 23. The limit pin 24 penetrates the guide block 23, and the bottom of the limit pin 24 is connected to the output end of the cylinder, thereby ensuring the accuracy of the movement of the limit pin 24 and the quality of locking the movable plate 17.

[0027] How it works

[0028] When the camera 5 needs to be tested, first open the opening and closing door 2, then pull the handle 14 to move the temperature control box 6 to the opening and closing door 2, then open the cover 4, install the camera 5 in the temperature control box 6 through the fixture 7, then cover the cover 4, push the handle 14 to reset the temperature control box 6, when the movable plate 17 touches the limit sensor 21, the limit sensor 21 will send a signal to the controller, and the controller will control the cylinder to start, so that the limit pin 24 extends and passes through the limit hole, thereby locking the movable plate 17, and then the temperature control system controls the temperature inside the temperature control box 6 to the test temperature, and then the camera 5 is powered on and takes pictures to obtain images; during the picture-taking process, the chart plate will rise and fall, that is, the chart The chart will rise and fall, thereby changing the clarity of the image taken by the camera 5, that is, the motion simulates the change of the object distance from near to far, and the clarity of the images is captured at multiple object distances. An MTF value is obtained according to the clarity value of the chart, and a clarity curve is obtained by continuously collecting multiple MTF values ​​and performing curve fitting. The peak position of the clarity curve is taken to obtain the object distance corresponding to the clearest state; thus, the image distance corresponding to the clearest state is obtained from the working height relationship of the chart, and then the image distance is compared with the focal length to obtain the defocus amount, and then the change in the influence of the external temperature change on the camera 5 is obtained; therefore, the present invention installs the test components inside the frame 1, thereby isolating them from the external environment, thereby ensuring the detection quality of the camera 5 during the detection process.

[0029] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "upper," "lower," "left," "right," "front," "rear," and similar expressions used herein are for illustrative purposes only.

[0030] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A camera defocus tester, characterized by: The invention comprises a frame (1) provided with an opening and closing door (2), a material feeding and discharging mechanism (13) installed at the bottom of the frame (1), and a temperature control box (6) fixed to the top of the material feeding and discharging mechanism (13); a camera (5) is installed inside the temperature control box (6) through a fixture (7); a cover plate (4) with a transparent window (8) is provided on the top of the temperature control box (6); the axis of the fixture (7) is aligned with the axis of a relay mirror (11) fixed to the bottom of a test system (10); the test system (10) comprises a chart plate that can be moved up and down, and the camera (5) is aligned with the chart plate.

2. The camera defocus tester according to claim 1, characterized in that: The test system (10) further comprises a lifting mechanism (9) for driving the chart to move up and down, and a support frame (12) fixedly connected to the inside of the frame (1), wherein the lifting mechanism (9) is mounted on the support frame (12).

3. The camera defocus tester according to claim 2, characterized in that: The frame (1) is provided with an electrical installation chamber (3), and electronic components for controlling the temperature control box (6) and the lifting mechanism (9) are all installed in the electrical installation chamber (3).

4. The camera defocus tester according to claim 1, wherein: The feeding and discharging mechanism (13) comprises a Y-axis moving mechanism slidably connected to the bottom of the frame (1), a Z-axis moving mechanism (15) fixedly connected to the output plate of the Y-axis moving mechanism, and an X-axis moving mechanism (27) fixedly connected to the output plate of the Z-axis moving mechanism (15); the temperature control box (6) is fixedly connected to the output plate of the X-axis moving mechanism (27).

5. The camera defocus tester according to claim 4, characterized in that: The Y-axis moving mechanism comprises a slide rail (18) fixed to the inner bottom of the frame (1), a slider (16) slidably connected to the slide rail (18), and a moving plate (17) fixed to the top of the slider (16); the Z-axis moving mechanism (15) is fixed to the moving plate (17).

6. The camera defocus tester according to claim 4, characterized in that: The Z-axis moving mechanism (15) adopts a Z-axis linear displacement stage.

7. The camera defocus tester according to claim 4, characterized in that: The X-axis moving mechanism (27) adopts a precision cross slide.

8. The camera defocus tester according to claim 5, characterized in that: A fixing plate (28) is provided on a side wall of the movable plate (17) close to the electrical installation chamber (3), and the fixing plate (28) is fixed to one end of the drag chain (25).

9. The camera defocus tester according to claim 5, characterized in that: The slide rail (18) is fixedly connected to the bottom of the frame (1) through a connecting plate (19); a positioning block (20) is fixedly connected to the end of the connecting plate (19) away from the opening and closing door (2); the end surface of the movable plate (17) is in close contact with the end surface of the positioning block (20); a limit sensor (21) is fixedly connected to the positioning block (20); a limit plate (26) is fixedly connected to a side wall of the movable plate (17) away from the opening and closing door (2); a locking mechanism for locking the limit plate (26) is also fixedly connected to the end of the connecting plate (19) away from the opening and closing door (2); and the locking mechanism is connected to the limit sensor (21).

10. The camera defocus tester according to claim 9, characterized in that: The locking mechanism comprises a guide mounting plate (22) fixedly connected to the connecting plate (19), a cylinder fixedly connected to the guide mounting plate (22), and a limit pin (24) fixedly connected to the output end of the cylinder. A limit hole is provided on the limit plate (26), and the limit pin (24) passes through the limit hole. The cylinder is connected to the limit sensor (21) through a controller.

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