A vision system and inspection equipment for detecting defects in optical convex mirrors

Abstract

This invention provides a vision system and device for detecting defects in optical convex lenses, comprising three sets of vision inspection modules. The first and third vision inspection modules are mirror-symmetrical, respectively detecting defects on the left and right edges of the sample. The first vision inspection module includes a first inspection camera and a first inspection light source; the second vision inspection module includes a second inspection camera and a second inspection light source; and the third vision inspection module includes a third inspection camera and a third inspection light source. The first, second, and third inspection cameras are located at the same height above the sample. The first and third inspection light sources are located diagonally above opposite sides of the sample, with the same vertical distance from the sample. The second inspection light source is located diagonally above the sample, with a greater vertical distance from the sample than the first inspection light source. By combining dual-station collaborative inspection with special reflective film optical path optimization technology, full coverage and high-precision detection of surface defects in optical convex lenses are achieved.

Description

Technical Field

[0001] This utility model relates to the field of optics, and in particular to a visual system and detection equipment for detecting defects in optical convex lenses. Background Technology

[0002] Convex lenses, as key optical components, are widely used in microscopes, telescopes, condenser lenses, and other equipment. Their quality is affected by manufacturing and transportation processes, and they are prone to appearance defects such as scratches, bubbles, cracks, and chipping, which directly affect image quality. Traditional manual visual inspection suffers from low efficiency, high subjectivity, and fatigue, making it difficult to meet the high-speed, high-resolution inspection requirements of modern industry. While existing automated optical inspection technologies can partially replace manual inspection with advancements in electronics, image sensing, and computer technology, they still have shortcomings in multi-angle defect detection and high-contrast imaging. Therefore, an improvement measure is urgently needed. Utility Model Content

[0003] This invention provides a vision system and detection equipment for detecting defects in optical convex mirrors. By combining dual-station collaborative detection with special reflective film optical path optimization technology, it achieves full coverage and high-precision detection of surface defects in optical convex mirrors.

[0004] The present invention specifically adopts the following technical solution: a visual system for detecting defects in optical convex lenses, characterized in that it includes a first visual detection module, a second visual detection module, and a third visual detection module sequentially arranged at different workstations. The first visual detection module and the third visual detection module are mirror images of each other and respectively detect defects on the left and right edges of the sample. The first visual detection module includes a first detection camera and a first detection light source. The second visual detection module includes a second detection camera and a second detection light source. The third visual detection module includes a third detection camera and a third detection light source. The first detection camera, the second detection camera, and the third detection camera are located at the same vertical height above the sample. The first detection light source and the third detection light source are located diagonally above opposite sides of the sample and at the same vertical distance from the sample. The second detection light source is located diagonally above the sample and at a greater vertical distance from the sample than the first detection light source.

[0005] As a further improved technical solution, reflective films are respectively provided below the first detection light source, the second detection light source and the third detection light source, and the reflective films are located below the detection sample during detection.

[0006] As a further improved technical solution, the first detection light source, the second detection light source, and the third detection light source are line light sources. The angle between the first detection light source and the central axis of the first detection camera is 25°-45°, the angle between the third detection light source and the central axis of the third detection camera is 25°-45°, and the angle between the second detection light source and the central axis of the second detection camera is 35°-55°.

[0007] As a further improved technical solution, the vertical distance between the lenses of the first detection camera, the second detection camera, and the third detection camera above the detection sample is 220±30mm.

[0008] As a further improved technical solution, the vertical distance between the first detection light source and the third detection light source above the detection sample is 30±30mm.

[0009] As a further improved technical solution, the vertical distance of the second detection light source above the detection sample is 50±30mm.

[0010] As a further improved technical solution, the vertical distance between the reflective film and the test sample is 10±10mm.

[0011] As a further improved technical solution, the reflective film is a coated semi-transparent mirror reflective film.

[0012] An optical convex lens defect detection device includes a machine base, a conveyor line, and the aforementioned defect detection vision system.

[0013] This utility model discloses an optical convex lens defect detection vision system and detection equipment, which is equipped with three vision detection modules. The optical component configuration of the individual and combined modules ensures that the light acts on the product surface with the optimal combination angle and intensity under different detection environments, thereby more effectively stimulating defect features and improving detection accuracy. Moreover, the three different stations integrate both dark field and bright field imaging technologies to detect optical convex lens defects from all angles. Stations one and three adopt low-angle dark field illumination and mirror light source layout to detect defects such as chipped edges and scratches, which appear as bright spots or bright stripes. Station two adopts high-angle bright field illumination to detect defects such as impurities, bubbles, and scratches, which appear as black dots or stripes. This multi-view, multi-modal detection method can more comprehensively and accurately identify various appearance defects, overcome the limitations of single detection methods, and improve imaging quality by combining it with a special reflective film to optimize the optical path and reduce stray light interference, so that even small defects can be captured more clearly. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the visual system of this application.

[0015] Figure 2 This is a schematic diagram of the first vision detection module in this application.

[0016] Figure 3 This is a schematic diagram of the second visual inspection module of this application.

[0017] Figure 4 This is a schematic diagram of the third vision detection module in this application. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure. Example 1

[0019] Reference Figure 1 The optical convex lens defect detection vision system of this embodiment includes a first vision detection module 1, a second vision detection module 2 and a third vision detection module 3 arranged sequentially at different workstations. The first vision detection module 1 and the third vision detection module 3 are mirror-symmetrical and respectively detect defects on the left and right edges of the convex lens sample. The second vision detection module 2 detects defects in the central area of ​​the surface of the convex lens sample. The first visual inspection module 1 includes a first inspection camera 11 and a first inspection light source 12. The second visual inspection module 2 includes a second inspection camera 21 and a second inspection light source 22. The third visual inspection module 3 includes a third inspection camera 31 and a third inspection light source 32. The first inspection light source 12, the second inspection light source 22 and the third inspection light source 32 are all line light sources. The first inspection camera 11, the second inspection camera 12 and the third inspection camera 13 are located at the same vertical height above the inspection sample 4. The first inspection light source 12 and the third inspection light source 32 are located diagonally above the opposite sides of the inspection sample 4 and are at the same vertical distance from the inspection sample 4. The second inspection light source 22 is located diagonally above the inspection sample 4 and is at a greater vertical distance from the inspection sample 4 than the first inspection light source 12 is at the same vertical distance from the inspection sample 4.

[0020] Furthermore, reflective films 3 are respectively provided below the first detection light source 12, the second detection light source 22, and the third detection light source 23. During detection, the reflective films 3 are located below the sample 4, and the vertical distance between the reflective films 3 and the sample 4 is the same at all three detection stations. The reflective film 3 is a coated semi-transparent mirror reflective film, such as a polycrystalline metal film, formed by physical vapor deposition (PVD) of metal elements (such as aluminum, silver, etc.) on a substrate; or a polycrystalline metal oxide film, with metal oxides (such as titanium dioxide, zinc oxide, etc.) as the main component, prepared by chemical vapor deposition (CVD) or sol-gel method, etc.

[0021] Specific references Figure 2 The first visual inspection module 1 serves as the first inspection station. The lens 13 of the first inspection camera 11 and the first inspection light source 12 are positioned above the inspection sample 4 at distances of WD1=220±30mm and LWD1=30±30mm, respectively. The angle α1 between the central axis of the first inspection light source 12 and the first inspection camera 11 is 25°-45°, preferably 35°. The distance D1 between the first inspection light source 12 and the first inspection camera 11 is 10±30mm. Simultaneously, the distance H1 between the special reflective film 3 located below the first inspection light source 12 and the inspection sample 4 is 10±10mm. The first inspection light source 12 illuminates the sample at a low angle, resulting in a "dark field" background. When the inspection sample surface has defects such as scratches, cracks, bumps, bubbles, or chipped edges, the light will be scattered at the defect locations. Some of the scattered light will enter the camera. Since the background is dark and the defect area is bright, the contrast between the defect and the background is very high, and the defect appears as obvious bright spots or bright stripes. The special reflective film at this workstation generates a multiple scattering effect through its microcrystalline structure, which significantly increases the intensity of scattered light at defects (such as scratches and chipped edges) while suppressing background reflected light on smooth surfaces, thereby further improving the detection sensitivity of minute defects.

[0022] Reference Figure 3 The lens 23 of the second inspection camera and the second inspection light source 22 are positioned above the inspection sample 4 at distances of WD2=220±30mm and LWD2=50±30mm, respectively. The angle α2 between the central axis of the second inspection light source and the second inspection camera is 35°-55°, preferably 45°. The distance D2 between the second inspection light source 22 and the second inspection camera 21 is 20±30mm. Simultaneously, the distance H2 between the special reflective film 3 located below the second inspection light source 22 and the inspection sample 4 is 10±10mm. The second visual inspection module 2 forms an optical bright-field inspection as the second inspection station. The second inspection light source 22 directly illuminates the surface of the inspection sample 4 at a high angle. The reflective film 3 below, through its high reflectivity and uniform crystal distribution, reduces local light spots and stray light interference from the light source, ensuring that the light uniformly covers the inspection area. This causes defects such as bubbles and cracks to appear as stable dark spots due to differences in reflectivity, avoiding false detections or missed detections caused by uneven illumination.

[0023] Reference Figure 4The lens 33 of the third inspection camera 31 and the third inspection light source 32 are positioned above the inspection sample 4 at distances of WD3=220±30mm and LWD3=30±30mm, respectively. The angle α3 between the central axis of the first inspection light source and the first inspection camera is 25°-45°, preferably 35°. The distance D3 between the third inspection light source 32 and the third inspection camera 31 is 10±30mm, and the distance H2 between the special reflective film 3 located below the third inspection light source 32 and the inspection sample 4 is 10±10mm. The third vision inspection module 3 serves as the third inspection station and is configured identically to the first vision inspection module 1. The third inspection light source 32 and the first inspection light source 12 are mirror-symmetrically positioned. For example, the light source setup of the third inspection station ensures that the left edge of the inspection sample has a better effect according to the direction of movement, while the right edge defect contrast is lower. The first inspection station is the opposite. Therefore, through the coordinated work of the first and third inspection stations, comprehensive inspection of defects on both sides of the optical convex lens can be ensured, avoiding omissions. Example 2

[0024] An optical convex lens defect detection device includes a machine base, a conveyor line, and the defect detection vision system of Embodiment 1 above. Through multi-station collaborative detection in dark and bright fields, combined with a mirror light source layout, it achieves full coverage and high-precision detection of surface defects of optical convex lenses.

[0025] Furthermore, the above embodiments are only used to illustrate the present utility model and are not intended to limit the technical solutions described in the present utility model. The understanding of this specification should be based on those skilled in the art. Although the present utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still make modifications or equivalent substitutions to the present utility model. All technical solutions and improvements that do not depart from the spirit and scope of the present utility model should be covered within the scope of the claims of the present utility model.

Claims

1. A vision system for detecting defects in optical convex lenses, characterized in that: The system includes a first vision inspection module, a second vision inspection module, and a third vision inspection module sequentially arranged at different workstations. The first and third vision inspection modules are mirror images of each other and are used to inspect defects on the left and right edges of the sample, respectively. The first vision inspection module includes a first inspection camera and a first inspection light source. The second vision inspection module includes a second inspection camera and a second inspection light source. The third vision inspection module includes a third inspection camera and a third inspection light source. The first, second, and third inspection cameras are located at the same vertical height above the sample. The first and third inspection light sources are located diagonally above opposite sides of the sample and at the same vertical distance from the sample. The second inspection light source is located diagonally above the sample and at a greater vertical distance from the sample than the first inspection light source.

2. The optical convex lens defect detection vision system according to claim 1, characterized in that: A reflective film is provided below the first detection light source, the second detection light source and the third detection light source respectively, and the reflective film is located below the detection sample during detection.

3. The optical convex lens defect detection vision system according to claim 1, characterized in that: The first detection light source, the second detection light source, and the third detection light source are line light sources. The angle between the first detection light source and the central axis of the first detection camera is 25°-45°, the angle between the third detection light source and the central axis of the third detection camera is 25°-45°, and the angle between the second detection light source and the central axis of the second detection camera is 35°-55°.

4. The optical convex lens defect detection vision system according to claim 1, characterized in that: The vertical distance between the lenses of the first detection camera, the second detection camera, and the third detection camera above the sample is 220±30mm.

5. The optical convex lens defect detection vision system according to claim 1, characterized in that: The vertical distance between the first detection light source and the third detection light source above the detection sample is 30±30mm.

6. The optical convex lens defect detection vision system according to claim 1, characterized in that: The second detection light source is 50±30mm above the detection sample.

7. The optical convex lens defect detection vision system according to claim 2, characterized in that: The vertical distance between the reflective film and the test sample is 10±10mm.

8. The optical convex lens defect detection vision system according to claim 7, characterized in that: The reflective film is a coated semi-transparent mirror reflective film.

9. An optical convex mirror defect detection device, characterized in that: It includes a machine, a conveyor line, and a defect detection vision system as described in any one of claims 1-6.

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