Optical lens appearance inspection optical dark background device

Abstract

This utility model relates to the field of optical inspection technology and discloses an optical dark background device for inspecting the appearance of optical lenses. It includes a dark background device fixing bracket, a fixed reference surface fixedly connected to the upper surface of the bracket, an XY motion platform slidably connected to the upper surface of the reference surface, and a dark background device positioned below the XY motion platform. The dark background device includes a light-absorbing black cloth positioned below the XY motion platform and fixedly connected to the upper surface of the bracket. A lens carrier is fixedly connected to the upper surface of the XY motion platform, and the lens to be tested is fixedly connected to the upper surface of the lens carrier. A support frame is fixedly connected to the outer wall of the XY motion platform. In this utility model, by constructing the light source, the lens to be tested, and the acquisition camera in a coaxial arrangement, combined with the conical dark background device positioned below the lens, lens appearance inspection under dark illumination conditions is achieved.

Description

Technical Field

[0001] This utility model relates to the field of optical inspection technology, and in particular to an optical dark background device for inspecting the appearance of optical lenses. Background Technology

[0002] With the continuous development of optical manufacturing technology, optical lenses are increasingly widely used in high-end fields such as consumer electronics, medical instruments, and precision imaging. To ensure the performance and quality of optical components, lenses must undergo rigorous appearance quality inspection before leaving the factory, including the identification of surface defects such as scratches, bubbles, foreign objects, and ripples. Currently, lens inspection not only needs to meet the requirements of high precision and high efficiency, but also needs to adapt to the changes in different types of optical materials and their surface treatment characteristics. Therefore, developing a reasonably structured and highly accurate optical lens appearance inspection device has become a key technological direction for improving the quality control level of optical components.

[0003] Existing optical lens inspection devices typically employ a combination of uniform frontal illumination and transmitted or reflected light observation. Their basic structure generally consists of a light source, an inspection platform, a lens fixing assembly, and a magnifying observation device. During inspection, the operator must adjust the brightness, angle, and position of the light source to obtain sufficient contrast, thereby visually observing the lens surface for visible defects. However, this optical configuration, which relies primarily on a bright background, suffers from limited imaging contrast when dealing with minute scratches or transparent defects. It is also susceptible to interference from light reflection and refraction, affecting the clarity of the inspection.

[0004] While existing devices can identify some common defects, their detection capabilities are insufficient when dealing with optical lenses with high uniformity and high light transmittance. Especially for small, low-contrast defects such as scratches and dents, they are difficult to distinguish from the lens background against a traditional bright background, resulting in low defect visibility. Relying on manual experience for judgment makes it difficult to guarantee accuracy and consistency. This detection method is not only inefficient but also carries the risk of missed detections or false positives, failing to meet the stringent quality control requirements of current high-end optical manufacturing. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides an optical dark background device for visual inspection of optical lenses, which aims to improve the existing structure's inability to detect minute defects, especially on optical glass with high lens power and high uniformity, where the visibility of defects is low and the efficiency and accuracy of manual inspection are insufficient.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an optical dark background device for inspecting the appearance of optical lenses, comprising a dark background device fixing bracket, a fixing reference surface fixedly connected to the upper surface of the dark background device fixing bracket, an XY motion platform slidably connected to the upper surface of the fixing reference surface, and a dark background device disposed below the XY motion platform.

[0007] The dark background device includes a light-absorbing black cloth, which is placed below the XY motion platform and fixedly connected to the upper surface of the dark background device mounting bracket. A lens carrier is fixedly connected to the upper surface of the XY motion platform, and a lens to be tested is fixedly connected to the upper surface of the lens carrier. A stand is fixedly connected to the outer wall of the XY motion platform, and a fixing plate is fixedly connected to the outer wall of the stand. A light source is fixedly connected to the lower surface of the fixing plate, and a camera is fixedly connected to the outer wall of the stand.

[0008] Furthermore, a fixing buckle is fixedly connected to the upper surface of the light-absorbing black cloth, and a replaceable matte black cover with a different diameter is fixedly connected to the upper surface of the light-absorbing black cloth. A fixing box is fixedly connected to the inner wall of the replaceable matte black cover with a different diameter. A button is slidably connected to the inner wall of the fixing box. A limit block is fixedly connected to one end of the button. A limit rod is fixedly connected to the inner wall of the limit block. A pressing block is fixedly connected to one end of the limit rod. A fixing block is fixedly connected to the outer wall of the pressing block. A spring is fixedly connected to one end of the pressing block.

[0009] Furthermore, the outer wall of the extrusion block is slidably connected to the inner wall of the fixed box, and the outer wall of the limiting block is slidably connected to the inner wall of the fixed box.

[0010] Furthermore, the outer wall of the fixing buckle is slidably connected to the inner wall of the fixing box, and the outer wall of the fixing block is slidably connected to the inner wall of the fixing buckle.

[0011] Furthermore, the outer wall of the button is slidably connected to the inner wall of the replaceable diameter matte black top cover, and one end of the spring is fixedly connected to the inner wall of the fixing box.

[0012] Furthermore, the light source is positioned above the lens being tested, and the acquisition camera is positioned above the light source.

[0013] Furthermore, the fixing box is located inside the replaceable diameter matte black top cover, and the fixing block is located inside the fixing box.

[0014] Furthermore, the limiting block is disposed inside the fixing box, which is disposed above the light-absorbing black cloth.

[0015] This utility model has the following beneficial effects:

[0016] 1. In this utility model, by constructing the light source, the lens under test, and the acquisition camera into a coaxial arrangement, and combining it with a cone-shaped dark background device set below the lens, the appearance inspection of the lens under dark lighting conditions is realized. The inner and outer surfaces of the dark background device are covered with light-absorbing black cloth, which effectively absorbs stray light and creates a low-brightness, high-contrast background environment, so that surface defects such as scratches, bubbles, and foreign objects of the lens can be clearly displayed in the dark background, thereby greatly improving the defect recognition rate and image acquisition quality. It is suitable for the inspection of optical lenses with high light transmittance and high consistency requirements.

[0017] 2. In this utility model, the quick-release mechanism composed of buttons, springs, limit blocks, and fixing blocks enables the quick disassembly and assembly of the top cover. This structure can match appropriate detection windows according to different lens specifications, ensuring that the background edge fits the lens, further preventing stray light interference. At the same time, it facilitates operators to quickly replace parts and perform cleaning and maintenance, effectively improving the equipment's adaptability, ease of operation, and long-term stability, and meeting the application needs of rapid detection scenarios for multiple lens specifications. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of an optical dark background device for inspecting the appearance of optical lenses proposed in this utility model;

[0019] Figure 2 This is a schematic diagram of the frame structure of an optical dark background device for inspecting the appearance of optical lenses proposed in this utility model;

[0020] Figure 3 This is a schematic diagram of the light-absorbing black cloth portion of an optical dark background device for inspecting the appearance of optical lenses proposed in this utility model.

[0021] Figure 4 for Figure 3 Enlarged view of point A in the image;

[0022] Figure 5 This is a schematic diagram of the fixing box part of an optical dark background device for inspecting the appearance of optical lenses proposed in this utility model.

[0023] Legend:

[0024] 1. Dark background device mounting bracket; 2. Fixed reference plane; 3. XY motion platform; 4. Lens carrier; 5. Lens under test; 6. Stand; 7. Light source; 8. Fixing plate; 9. Acquisition camera; 10. Light-absorbing black cloth; 11. Replaceable diameter matte black top cover; 12. Fixing buckle; 13. Spring; 14. Button; 15. Fixing box; 16. Limiting block; 17. Limiting rod; 18. Fixing block; 19. Extrusion block. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Reference Figures 1-5 This utility model provides an embodiment of an optical lens appearance inspection dark background device, including a dark background device fixing bracket 1. The dark background device fixing bracket 1 serves as the basic support structure of the entire device, bearing the load and fixing functions of the dark background device and other components, ensuring the overall stability and rigidity of the device. By connecting to a fixed reference surface 2, the installation position of the subsequent motion platform is ensured to be accurate and stable. The fixed reference surface 2 is fixedly connected to the upper surface of the dark background device fixing bracket 1, and an XY motion platform 3 is slidably connected to the upper surface of the fixed reference surface 2. The XY motion platform 3 enables precise movement of the lens carrier 4 and the lens under test 5 in a dual-axis direction on a horizontal plane, allowing each lens to be accurately positioned sequentially in the inspection area, improving the automation and efficiency of the inspection, and avoiding human positioning errors. The dark background device is located below the XY motion platform 3.

[0027] The dark background device includes a light-absorbing black cloth 10, which covers the inner and outer surfaces of a cone-shaped structure inside the device. The black cloth 10 absorbs ambient light and stray light, forming a low-brightness, non-reflective pure black background, significantly improving image contrast and detection sensitivity. The black cloth 10 is positioned below the XY motion platform 3 and is fixedly connected to the upper surface of the dark background device mounting bracket 1. A lens carrier 4 is fixedly connected to the upper surface of the XY motion platform 3, supporting multiple test lenses 5 to ensure the stability of the lenses on the motion platform. To prevent the lens from shaking or shifting during movement and to ensure the clarity and repeatability of the detection image, the lens carrier 4 has the lens to be tested 5 fixedly connected to its upper surface. The XY motion platform 3 has a stand 6 fixedly connected to its outer wall. The stand 6 has a fixed plate 8 fixedly connected to its outer wall. The fixed plate 8 connects the stand 6 and the light source 7, ensuring the stability and correctness of the position of the light source 7 and fixing the illumination angle and distance to avoid the light source 7 from being affected by vibration or positional displacement. The fixed plate 8 has the light source 7 fixedly connected to its lower surface. The stand 6 has a camera 9 fixedly connected to its outer wall.

[0028] Reference Figures 1-5A fixing buckle 12 is fixedly connected to the upper surface of the light-absorbing black cloth 10. The fixing buckle 12 is installed between the light-absorbing black cloth 10 and the fixing box 15, serving as a quick-fixing component for the replaceable matte black top cover 11. It cooperates with the fixing block 18 to achieve installation positioning and secure locking. The replaceable matte black top cover 11 is fixedly connected to the upper surface of the light-absorbing black cloth 10. The fixing box 15 is fixedly connected to the inner wall of the replaceable matte black top cover 11. A button 14 is slidably connected to the inner wall of the fixing box 15. One end of the button 14 is fixedly connected to a limit block 16. The limit block 16 cooperates with the pressing block 19 to control the locking state of the fixing block 18, ensuring the stable fixation of the top cover in the installation position. A limit rod 17 is fixedly connected to the inner wall of the limit block 16. One end of the limit rod 17 is fixedly connected to the pressing block 19. A fixing block 18 is fixedly connected to the outer wall of the compression block 19. A spring 13 is fixedly connected to one end of the compression block 19. The spring 13 provides elastic support for the movement of the button 14 and the fixing block 18, so that the limiting mechanism can achieve automatic reset and stable fixation, ensuring smooth installation and disassembly. The outer wall of the compression block 19 is slidably connected to the inner wall of the fixing box 15. The outer wall of the limiting block 16 is slidably connected to the inner wall of the fixing box 15. The outer wall of the fixing buckle 12 is slidably connected to the inner wall of the fixing box 15. The outer wall of the fixing block 18 is slidably connected to the inner wall of the fixing buckle 12. The outer wall of the button 14 is slidably connected to the inner wall of the replaceable diameter matte black top cover 11. The replaceable diameter matte black top cover 11 is installed on the top of the dark background device to adapt to lenses of different diameters, control the incident light aperture, and prevent light scattering and stray light interference. The matte black material reduces reflection and ensures a clean background. One end of the spring 13 is fixedly connected to the inner wall of the fixing box 15. The light source 7 is positioned above the lens 5 under test, and the acquisition camera 9 is positioned above the light source 7. The light source 7 is located directly above the lens 5 under test, providing uniform and stable ring illumination. Its uniform illumination can clearly show the defects on the lens surface in the image, improving the accuracy of defect identification. The fixing box 15 is located inside the replaceable diameter matte black top cover 11. The fixing block 18 is located inside the fixing box 15. The fixing block 18 cooperates with the fixing buckle 12. The action of the squeezing block 19 realizes the locking and releasing of the replaceable diameter matte black top cover 11, ensuring that the top cover is stably installed and easy to disassemble. The limiting block 16 is located inside the fixing box 15, and the fixing box 15 is positioned above the light-absorbing black cloth 10.

[0029] Working principle: A fixed reference surface 2 is set on the fixed bracket 1 of the dark background device, and an XY motion platform 3 is installed on it to achieve precise movement of the lens in the X and Y directions. The platform is equipped with a lens carrier 4 to carry multiple lenses 5 to be tested. During each test, the platform moves to align a single lens 5 to be tested with the detection area above. The dark background device is located below the XY motion platform 3 and is a conical structure with an open top and closed bottom. The inner and outer surfaces are covered with light-absorbing black cloth 10 to provide a non-reflective, low-brightness background and improve image contrast. The light-absorbing black cloth 10 is fixedly connected to the fixed bracket 1 of the dark background device to keep the background stable. A stand 6 is fixed on the XY motion platform 3, on which a fixed plate 8, a ring light source 7 and a acquisition camera 9 are installed in sequence. The three and the lens 5 to be tested form an upper-middle-lower three-axis alignment structure to ensure uniform illumination of the light source 7 and stable image acquisition. The acquisition camera 9 acquires the image of the light source 7 after passing through the lens. The background is always a pure black area, which effectively improves the ability to identify surface defects and is suitable for the inspection of optical lenses with high light transmittance and high consistency.

[0030] In addition, to accommodate lenses of different diameters and ensure a clean image background, the dark background device is equipped with a replaceable matte black top cover 11. The top cover is installed using a limiting mechanism driven by button 14 for quick replacement: the operator presses button 14 to compress spring 13, causing the fixing block 18 to retract, inserts the new replaceable matte black top cover 11 with fixing buckle 12, and then releases button 14. Spring 13 rebounds, causing the fixing block 18 to automatically snap into fixing buckle 12 to complete the installation. The above process is repeated for quick replacement during disassembly. The overall structure of the device adopts a conical design with a smaller top and a larger bottom. The top opening size is close to the four-sided length of the lens carrier, and the bottom is close to the edge of the XY platform, which maximizes the fit with the lens edge, blocks stray light, and avoids motion interference. The cone and the bottom surface form an angle of about 60°, which provides good light blocking depth while maintaining a compact structure, effectively blocking ambient light, improving the light extinction effect, and enhancing the quality and stability of the detected image.

[0031] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An optical dark background device for inspecting the appearance of optical lenses, comprising a dark background device fixing bracket (1), characterized in that: The upper surface of the fixed bracket (1) of the dark background device is fixedly connected to a fixed reference surface (2), and the upper surface of the fixed reference surface (2) is slidably connected to an XY motion platform (3). The dark background device is set below the XY motion platform (3). The dark background device includes a light-absorbing black cloth (10), which is placed below the XY motion platform (3). The light-absorbing black cloth (10) is fixedly connected to the upper surface of the dark background device fixing bracket (1). A lens carrier (4) is fixedly connected to the upper surface of the XY motion platform (3). A test lens (5) is fixedly connected to the upper surface of the lens carrier (4). A stand (6) is fixedly connected to the outer wall of the XY motion platform (3). A fixing plate (8) is fixedly connected to the outer wall of the stand (6). A light source (7) is fixedly connected to the lower surface of the fixing plate (8). A camera (9) is fixedly connected to the outer wall of the stand (6).

2. The optical dark background device for inspecting the appearance of optical lenses according to claim 1, characterized in that: The light-absorbing black cloth (10) is fixedly connected to a fixing buckle (12) on its upper surface. A replaceable matte black cover (11) with a different diameter is fixedly connected to the upper surface of the light-absorbing black cloth (10). A fixing box (15) is fixedly connected to the inner wall of the replaceable matte black cover (11). A button (14) is slidably connected to the inner wall of the fixing box (15). A limit block (16) is fixedly connected to one end of the button (14). A limit rod (17) is fixedly connected to the inner wall of the limit block (16). A squeezing block (19) is fixedly connected to one end of the limit rod (17). A fixing block (18) is fixedly connected to the outer wall of the squeezing block (19). A spring (13) is fixedly connected to one end of the squeezing block (19).

3. The optical dark background device for inspecting the appearance of optical lenses according to claim 2, characterized in that: The outer wall of the extrusion block (19) is slidably connected to the inner wall of the fixed box (15), and the outer wall of the limiting block (16) is slidably connected to the inner wall of the fixed box (15).

4. The optical dark background device for inspecting the appearance of optical lenses according to claim 2, characterized in that: The outer wall of the fixing buckle (12) is slidably connected to the inner wall of the fixing box (15), and the outer wall of the fixing block (18) is slidably connected to the inner wall of the fixing buckle (12).

5. The optical dark background device for inspecting the appearance of optical lenses according to claim 2, characterized in that: The outer wall of the button (14) is slidably connected to the inner wall of the replaceable diameter matte black top cover (11), and one end of the spring (13) is fixedly connected to the inner wall of the fixing box (15).

6. The optical dark background device for inspecting the appearance of optical lenses according to claim 2, characterized in that: The light source (7) is positioned above the lens (5) being tested, and the acquisition camera (9) is positioned above the light source (7).

7. The optical dark background device for inspecting the appearance of optical lenses according to claim 2, characterized in that: The fixing box (15) is located inside the replaceable diameter matte black top cover (11), and the fixing block (18) is located inside the fixing box (15).

8. The optical dark background device for inspecting the appearance of optical lenses according to claim 2, characterized in that: The limiting block (16) is set inside the fixing box (15), which is set above the light-absorbing black cloth (10).

Images