Appearance inspection device for cambered cover plate

Abstract

The utility model discloses an appearance detection device of cambered surface cover plate for carrying out appearance detection to the cover plate with cambered surface, appearance detection device of cambered surface cover plate includes: imaging device, object table for placing cover plate, light source subassembly is located between imaging device and object table, and the one side of light source subassembly towards object table has the spherical surface recessed to light source subassembly inside, and the spherical surface has multiple first annular stripes and multiple second annular stripes that set up in turn along the radial direction, and the color of first annular stripe and second annular stripe is different, and first annular stripe and second annular stripe set up in turn interval, and light source subassembly has imaging opening, and the light that light source subassembly sent is reflected to form reflected light by cover plate, and imaging device receives reflected light through imaging opening to carry out imaging to cover plate. The device can be only carried out image acquisition, and the detection step is simplified, and the detection efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of testing equipment for mobile phone products, and in particular to an appearance testing device for curved cover plates. Background Technology

[0002] The appearance inspection device for curved mobile phone cover plates in related technologies usually requires lighting from different angles and multiple image acquisitions to cover all areas of the curved surface of the cover plate. This results in low inspection efficiency and complex product structure. Utility Model Content

[0003] This application aims to address at least one of the technical problems existing in the prior art or related technologies.

[0004] In view of this, the present application proposes an appearance inspection device for curved cover plates, used to perform appearance inspection on cover plates with curved surfaces. The appearance inspection device for curved cover plates includes: an imaging device; a stage for placing the cover plate; and a light source assembly located between the imaging device and the stage. The side of the light source assembly facing the stage has a spherical surface that is recessed inward. The spherical surface has a plurality of first annular stripes and a plurality of second annular stripes arranged radially in sequence. The first annular stripes and the second annular stripes are different colors and are arranged alternately in sequence. The light source assembly has an imaging opening. The light emitted by the light source assembly is reflected by the cover plate to form reflected light. The imaging device receives the reflected light through the imaging opening to image the cover plate.

[0005] In some of the technical solutions provided in this application, the imaging opening is located at the center of the sphere, and the distribution areas of the first annular stripe and the second annular stripe extend radially from the edge of the imaging opening to the edge of the sphere.

[0006] In some of the technical solutions provided in this application, the edge of the cover plate has an arc surface, and the projection of the spherical surface on the stage can cover the edge of the cover plate.

[0007] In some of the technical solutions provided in this application, the widths of the first and second annular stripes gradually increase in the direction away from the center of the sphere.

[0008] In some of the technical solutions provided in this application, the light source assembly includes: a cover, with a spherical surface disposed on the side of the cover facing the stage, and an imaging opening disposed on the top of the cover; a mounting plate connected to the edge of the cover facing the stage; and multiple light-emitting elements mounted on the mounting plate, the light-emitting elements being able to emit light.

[0009] In some of the technical solutions provided in this application, the mounting plate extends in a direction away from the center of the sphere, and the vertical projection of the center of the sphere onto the plane where the mounting plate is located is the virtual center. The distance between any of the multiple light-emitting elements and the virtual center is greater than the maximum outer diameter of any first annular stripe and any second annular stripe.

[0010] In some of the technical solutions provided in this application, multiple light-emitting elements are evenly distributed on the mounting plate along the circumference of the sphere.

[0011] In some of the technical solutions provided in this application, the axis of the imaging device coincides with the axis of the light source assembly, and the axis of the imaging device and the axis of the light source assembly are perpendicular to the stage.

[0012] In some of the technical solutions provided in this application, the imaging device is an area array camera.

[0013] In some of the technical solutions provided in this application, the appearance inspection device for the curved cover plate also includes: a support frame, an imaging device and a light source assembly mounted on the support frame.

[0014] Compared with the prior art, the present invention has at least the following beneficial effects: By setting first and second annular stripes of different colors on the spherical surface of the light source assembly, the patterns of the first and second annular stripes can be projected onto the curved surface of the cover plate. The shape changes of the projected first and second annular stripes on the curved surface can then be used to determine whether the curved surface of the cover plate has defects. An imaging device images the cover plate, and the imaging results allow for more accurate appearance inspection. Compared to traditional inspection devices, the appearance inspection device proposed in this application does not require multi-angle lighting or controlling the imaging device to rotate around the center for multiple image acquisitions, simplifying the inspection process, improving inspection efficiency, and having fewer components, thus simplifying the product structure and reducing product cost. Attached Figure Description

[0015] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 This application provides a schematic diagram of the appearance inspection device for an arc-shaped cover plate according to one embodiment. Figure 2 This is a second schematic diagram of the appearance inspection device for an arc-shaped cover plate according to an embodiment of the present application; Figure 3This application provides a third schematic diagram of the appearance inspection device for an arc-shaped cover plate according to one embodiment. Figure 4 This application provides a schematic diagram of the structure of a light source assembly according to one embodiment. Figure 5 A second schematic diagram of the structure of a light source assembly according to an embodiment of this application is shown; Figure 6 The third schematic diagram shows the structure of a light source assembly according to an embodiment of this application.

[0016] in, Figures 1 to 6 The correspondence between the reference numerals and component names in the attached drawings is as follows: 100. Appearance inspection device for curved cover plate; 110. Imaging device; 120. Stage; 130. Light source assembly; 131. Cover body; 132. Mounting plate; 133. Light-emitting element; 134. First annular stripe; 135. Second annular stripe; 136. Imaging opening; 200. Cover plate. Detailed Implementation

[0017] To better understand the above technical solutions, the technical solutions of the embodiments of this application will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of this application and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this application, rather than limitations on the technical solutions of this application. In the absence of conflict, the embodiments of this application and the technical features in the embodiments can be combined with each other.

[0018] The following reference Figures 1 to 6 Description of an appearance inspection device 100 for an arc-shaped cover plate provided according to some embodiments of the present invention.

[0019] In one embodiment according to this application, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, this application proposes an appearance inspection device 100 for curved cover plates 200, used for appearance inspection of curved cover plates 200. The appearance inspection device 100 for curved cover plates includes: an imaging device 110; a stage 120 for placing the cover plate 200; and a light source assembly 130 located between the imaging device 110 and the stage 120. The side of the light source assembly 130 facing the stage 120 has a spherical surface that is recessed inward. The spherical surface has a plurality of first annular stripes 134 and a plurality of second annular stripes 135 arranged radially in sequence. The first annular stripes 134 and the second annular stripes 135 are different colors and are arranged alternately in sequence. The light source assembly 130 has an imaging opening 136. The light emitted by the light source assembly 130 is reflected by the cover plate 200 to form reflected light. The imaging device 110 receives the reflected light through the imaging opening 136 to image the cover plate 200.

[0020] The appearance inspection device 100 for curved cover plates proposed in this application is used to perform appearance inspection on a cover plate 200 with a curved surface. The cover plate 200 can be a mobile phone cover plate or a cover plate for other electronic devices, such as a tablet computer. The appearance inspection device 100 for curved cover plates includes an imaging device 110, a stage 120, and a light source assembly 130. The stage 120 is used to place the cover plate 200. The light source assembly 130 can emit light and project a regular image from within the light source assembly 130 onto the cover plate 200. The cover plate 200 reflects the light to the imaging device 110, which images the cover plate 200. Based on the imaging result of the imaging device 110, the appearance of the cover plate 200 can be inspected.

[0021] Specifically, the light source assembly 130 is placed between the imaging device 110 and the stage 120. The side of the light source assembly 130 facing the stage 120 has a spherical surface, which is recessed inwards, giving the light source assembly 130 a dome-shaped structure. The spherical surface has multiple stripes arranged radially in sequence. Specifically, the multiple stripes include multiple first annular stripes 134 and multiple second annular stripes 135. The first annular stripes 134 and second annular stripes 135 have different colors and are arranged alternately along the radial direction of the spherical surface. In one possible embodiment, the first annular stripes 134 are black, and the second annular stripes 135 are white. When the light source assembly 130 projects onto the cover plate 200, the patterns of the first annular stripes 134 and the second annular stripes 135 on the spherical surface are projected onto the cover plate 200. Since the cover plate 200 has a curved surface, the projection shapes of the first annular stripes 134 and the second annular stripes 135 on the curved surface of the cover plate 200 change with the curved surface. If the curved surface changes regularly, the projections of the first annular stripes 134 and the second annular stripes 135 will also show regular shapes. If the curved surface has defects such as bumps or indentations, the projections of the first annular stripes 134 and the second annular stripes 135 will show abrupt changes or bends. By imaging the cover plate 200 through the imaging device 110, the projection shapes of the first annular stripes 134 and the second annular stripes 135 can be observed, thereby realizing the appearance inspection of the cover plate 200.

[0022] Furthermore, the light source assembly 130 has an imaging opening 136, which allows light reflected from the cover plate 200 to propagate to the imaging device 110, enabling the imaging device 110 to image the cover plate 200. Specifically, the imaging opening 136 is located at the top center of the light source assembly 130. Light emitted from the light source assembly 130 is reflected by the cover plate 200 to form reflected light, which propagates through the imaging opening 136 to the imaging device 110. The imaging device 110 receives the reflected light through the imaging opening 136 to image the cover plate 200.

[0023] By setting first annular stripes 134 and second annular stripes 135 of different colors on the spherical surface of the light source assembly 130, the patterns of the first annular stripes 134 and second annular stripes 135 can be projected onto the arc surface of the cover plate 200. The shape changes of the projections of the first annular stripes 134 and second annular stripes 135 on the arc surface can then be used to determine whether the arc surface of the cover plate 200 has defects. The imaging device 110 images the cover plate 200, and the imaging results allow for more accurate appearance inspection of the cover plate 200. Compared to traditional inspection devices, the appearance inspection device proposed in this application does not require multi-angle lighting or controlling the imaging device 110 to rotate around the center for multiple image acquisitions, simplifying the inspection steps, improving inspection efficiency, and having fewer components, thus simplifying the product structure and reducing product costs.

[0024] In some embodiments, the imaging opening 136 is optionally located at the center of the sphere, and the distribution area of ​​the first annular stripe 134 and the second annular stripe 135 extends radially from the edge of the imaging opening 136 to the edge of the sphere.

[0025] In this embodiment, the structure of the light source assembly 130 is further defined. The light source assembly 130 has an imaging opening 136 for imaging, which is located at the center of the spherical surface of the light source assembly 130. The distribution area of ​​the first annular stripe 134 and the second annular stripe 135 extends radially from the edge of the imaging opening 136 to the edge of the spherical surface, that is, the first annular stripe 134 and the second annular stripe 135 are distributed on the entire spherical surface. This increases the distribution area of ​​the first annular stripe 134 and the second annular stripe 135, thereby increasing the projected area of ​​the first annular stripe 134 and the second annular stripe 135 on the cover plate 200, making the light source assembly 130 suitable for larger size cover plates 200, and expanding the size range of cover plates 200 that the appearance inspection device 100 for curved cover plates can detect.

[0026] In some embodiments, the edge of the cover plate 200 is optionally curved, and the projection of the spherical surface onto the stage 120 can cover the edge of the cover plate 200.

[0027] In this embodiment, the dimensional relationship between the spherical surface and the cover plate 200 is defined. The edge of the cover plate 200 has an arc surface, and the projection of the spherical surface onto the stage 120 can cover the edge of the cover plate 200. That is, the entire cover plate 200 is located within the projection range of the spherical surface onto the stage 120. When the cover plate 200 is inspected by the appearance inspection device 100 for the arc-surface cover plate, there is no need to move the imaging device 110 or the cover plate 200 multiple times; only one image acquisition is required, which further simplifies the inspection steps and improves the inspection efficiency.

[0028] In some embodiments, optionally, the widths of the first annular stripe 134 and the second annular stripe 135 gradually increase in the direction away from the center of the sphere.

[0029] In this embodiment, the first annular stripe 134 and the second annular stripe 135 are further defined. The plurality of first annular stripes 134 and the plurality of second annular stripes 135 in this application are not stripe patterns of equal width. Specifically, the widths of the first annular stripes 134 and the second annular stripes 135 gradually increase in the direction away from the center of the sphere. Understandably, the cover plate 200 is a 2.5D cover plate, and the arc surface at the edge of the cover plate 200 is not formed according to a fixed curvature. Near the edge of the cover plate 200, the slope of the tangent of the arc surface increases rapidly. If the plurality of first annular stripes 134 and the plurality of second annular stripes 135 were stripes of equal width, then near the edge of the cover plate 200, the stripe width projected onto the arc surface by the first annular stripes 134 and the second annular stripes 135 would be very small, making observation difficult and resulting in poor detection performance.

[0030] To avoid the aforementioned problems, this application sets the multiple first annular stripes 134 and multiple second annular stripes 135 to a variable width shape, that is, in the direction away from the center of the sphere, the width of the first annular stripes 134 and the second annular stripes 135 gradually increases. This ensures that the stripe widths formed by the projection of the multiple first annular stripes 134 and the multiple second annular stripes 135 at various positions on the cover plate 200 tend to be the same, thereby making it easier to observe defects and improving the accuracy of the detection results.

[0031] In some embodiments, optionally, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the light source assembly 130 includes: a cover 131 with a spherical surface on the side of the cover 131 facing the stage 120, and an imaging opening 136 on the top of the cover 131; a mounting plate 132 connected to the edge of the cover 131 facing the stage 120; and a plurality of light-emitting elements 133 mounted on the mounting plate 132, the light-emitting elements 133 being able to emit light.

[0032] In this embodiment, the structure of the light source assembly 130 is defined. The light source assembly 130 includes a cover 131, a mounting plate 132, and a plurality of light-emitting elements 133. The mounting plate 132 is connected to the cover 131, and the light-emitting elements 133 are mounted on the mounting plate 132. The cover 131 has a dome-shaped structure, and the cover 131 is recessed inward to form a spherical surface, which is located on the side of the cover 131 facing the stage 120. An imaging opening 136 is located on the top of the cover 131. Specifically, the imaging opening 136 is located at the center of the cover 131, and the center of the imaging opening 136 coincides with the axis of the cover 131. The axis of the cover 131 coincides with the axis of the light source assembly 130.

[0033] Furthermore, the mounting plate 132 is located on the side of the cover 131 facing the stage 120. Specifically, the mounting plate 132 is connected to the edge of the cover 131 facing the stage 120, and the mounting plate 132 is a ring-shaped plate structure. Multiple light-emitting elements 133 are mounted on the mounting plate 132. Because the mounting plate 132 is close to the stage 120, the light emitted by the light-emitting elements 133 can be more concentrated on the cover 131. The light-emitting elements 133 can be LED beads.

[0034] In some embodiments, optionally, the mounting plate 132 extends in a direction away from the center of the sphere, and the vertical projection of the center of the sphere onto the plane where the mounting plate 132 is located is a virtual center, and the distance between any of the plurality of light-emitting elements 133 and the virtual center is greater than the maximum outer diameter of any first annular stripe 134 and any second annular stripe 135.

[0035] In this embodiment, the relationship between the light-emitting element 133 and the first annular stripe 134 and the second annular stripe 135 is defined. The mounting plate 132 extends in a direction away from the center of the sphere, that is, the mounting plate 132 extends outward from the cover 131. The vertical projection of the center of the sphere onto the plane where the mounting plate 132 is located is a virtual center. The distance between any of the multiple light-emitting elements 133 and the virtual center is greater than the maximum outer diameter of any first annular stripe 134 and any second annular stripe 135. That is, the light-emitting element 133 avoids the first annular stripe 134 and the second annular stripe 135, preventing occlusion of the first annular stripe 134 and the second annular stripe 135, thereby improving the projection effect and imaging effect.

[0036] In some embodiments, optionally, a plurality of light-emitting elements 133 are evenly distributed on the mounting plate 132 along the circumference of the sphere.

[0037] In this embodiment, the distribution of the multiple light-emitting elements 133 is defined. Specifically, the multiple light-emitting elements 133 are evenly distributed on the mounting plate 132 along the circumference of the sphere. This allows the light to illuminate the cover 131 more evenly, avoiding uneven light intensity at different positions on the cover 131, improving the imaging effect, and thus improving the accuracy of the detection.

[0038] In some embodiments, the axis of the imaging device 110 coincides with the axis of the light source assembly 130, and the axes of the imaging device 110 and the light source assembly 130 are perpendicular to the stage 120.

[0039] In this embodiment, the positional relationship between the imaging device 110, the light source assembly 130, and the stage 120 is further defined. Specifically, the axis of the imaging device 110 coincides with the axis of the light source assembly 130, and the axes of the imaging device 110 and the light source assembly 130 are perpendicular to the stage 120. This allows the imaging device 110 to uniformly receive light reflected from all positions of the cover plate 200, improving the imaging effect and avoiding uneven imaging of the cover plate 200, making it easier to observe defects on the surface of the cover plate 200, thereby improving the accuracy of the detection results.

[0040] In some embodiments, the imaging device 110 may be an area array camera.

[0041] In this embodiment, the imaging device 110 is defined as an area scan camera. Area scan cameras are characterized by capturing the entire two-dimensional image at once and have high color fidelity. By using an area scan camera as the imaging device 110, a single image acquisition can be performed to inspect the cover plate 200, eliminating the need for multiple image acquisitions and improving inspection efficiency.

[0042] In some embodiments, the appearance inspection device 100 for the curved cover plate may optionally include a support frame, an imaging device 110 and a light source assembly 130 mounted on the support frame.

[0043] In this embodiment, the structure of the appearance inspection device 100 for curved cover plates is further defined. The appearance inspection device 100 for curved cover plates also includes a support frame, on which the imaging device 110 and the light source assembly 130 are mounted to achieve the installation and fixation of the imaging device 110 and the light source assembly 130.

[0044] In one possible embodiment, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, the appearance inspection device 100 for curved cover plates includes an area scan camera (i.e., imaging device 110), a specific dome-shaped stripe light source (i.e., light source assembly 130), a transmission structure, and a frame support structure (i.e., support frame). The area scan camera and the dome-shaped stripe light source are installed at a specified angle and distance. The inspection product (i.e., cover 131) is placed on a stage 120, which is placed on the transmission structure. When the transmission structure moves the inspection product to the imaging area via the stage 120, the dome-shaped stripe light source is illuminated, and the area scan camera takes a picture; both occur simultaneously. The bright and dark lines of the dome-shaped stripe light source (i.e., the first annular stripe 134 and the second annular stripe 135) are reflected into the area scan camera through the curved area of ​​the 2.5D cover plate (i.e., cover plate 200). The curved area of ​​the 2.5D cover plate will image alternating bright and dark lines. If there are concave or convex points or indentation defects in this area, the lines will deform. The defect features are extracted by judging the deformation of the lines. Traditional inspection methods for detecting dents and indentations on 2.5D curved surfaces require lighting at different angles and multiple image acquisitions to cover the entire 360° area of ​​the 2.5D curved surface, or rely on an electric device to rotate the camera around the center for image acquisition. Therefore, the advantage of the curved surface cover plate appearance inspection device 100 proposed in this application is that it can cover the detection of dents and indentations in the entire 360° area of ​​the 2.5D curved surface with only one image acquisition, which can greatly improve the inspection efficiency. In one possible embodiment, the imaging device 110 can be an area array camera and an FA lens.

[0045] The imaging device 110 employs a 2500W resolution color area scan camera paired with a 35mm focal length FA lens. The cover plate 200 is placed horizontally, with the angle between the area scan camera and the vertical direction being 0°, and the working distance between the area scan camera and the cover plate 200 being 232mm. The axis of the dome-shaped fringe light source has an angle of 0° with the vertical direction, and the working distance between the dome-shaped fringe light source and the cover plate 200 is 5mm. The central axis of the dome-shaped fringe light source coincides with the central axis of the FA lens, and the cover plate 200 is positioned at the center of the dome-shaped fringe light source.

[0046] The dome-shaped striped light source uses a specially customized light source. On the basis of the dome light source, black stripes are painted on it. The width and spacing of the stripes gradually increase from the center of the dome to the outer edge of the dome.

[0047] The product under test (i.e., cover plate 200) is placed directly below the dome stripe light source and the area scan camera, and centered in the field of view of the area scan camera. After the dome stripe light source is lit, the curved area of ​​the 2.5D cover plate of the mobile phone will reflect the black and white stripes on the dome into the area scan camera. In the image of the area scan camera, multiple black and white stripes will appear on the curved area. If there are defects such as bumps or indentations in this area, the stripes will be deformed. The shape of the stripes can be used to determine whether there are defects such as bumps or indentations.

[0048] In this utility model, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "install," "connect," "join," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "join" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0049] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0050] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0051] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A device for inspecting the appearance of an arc-shaped cover plate, characterized in that, The device for visually inspecting curved cover plates includes: Imaging devices; A stage for placing the cover plate; A light source assembly is located between the imaging device and the stage. The side of the light source assembly facing the stage has a spherical surface that is recessed inward. The spherical surface has a plurality of first annular stripes and a plurality of second annular stripes arranged radially in sequence. The first annular stripes and the second annular stripes are different colors and are arranged alternately in sequence. The light source assembly has an imaging opening. The light emitted by the light source assembly is reflected by the cover plate to form reflected light. The imaging device receives the reflected light through the imaging opening to image the cover plate.

2. The appearance inspection device for arc-shaped cover plates according to claim 1, characterized in that, The imaging opening is located at the center of the sphere, and the distribution areas of the first annular stripe and the second annular stripe extend radially from the edge of the imaging opening to the edge of the sphere.

3. The appearance inspection device for the arc-shaped cover plate according to claim 2, characterized in that, The edge of the cover plate has an arc surface, and the projection of the spherical surface onto the platform can cover the edge of the cover plate.

4. The appearance inspection device for the arc-shaped cover plate according to claim 1, characterized in that, The widths of the first and second annular stripes gradually increase in the direction away from the center of the sphere.

5. The appearance inspection device for arc-shaped cover plates according to claim 1, characterized in that, The light source assembly includes: The cover has a spherical surface on the side of the cover facing the stage, and the imaging opening is located on the top of the cover. Mounting plate, connected to the edge of the cover facing the platform; Multiple light-emitting elements are mounted on the mounting plate, and the light-emitting elements are capable of emitting light.

6. The appearance inspection device for arc-shaped cover plates according to claim 5, characterized in that, The mounting plate extends in a direction away from the center of the sphere, and the vertical projection of the center of the sphere onto the plane where the mounting plate is located is a virtual center. The distance between any of the plurality of light-emitting elements and the virtual center is greater than the maximum outer diameter of any of the first annular stripes and any of the second annular stripes.

7. The appearance inspection device for arc-shaped cover plates according to claim 5, characterized in that, Multiple light-emitting elements are evenly distributed on the mounting plate along the circumference of the spherical surface.

8. The appearance inspection device for the arc-shaped cover plate according to any one of claims 1 to 7, characterized in that, The axis of the imaging device coincides with the axis of the light source assembly, and the axis of the imaging device and the axis of the light source assembly are perpendicular to the stage.

9. The appearance inspection device for the arc-shaped cover plate according to any one of claims 1 to 7, characterized in that, The imaging device is an area array camera.

10. The appearance inspection device for the arc-shaped cover plate according to any one of claims 1 to 7, characterized in that, Also includes: The imaging device and the light source assembly are mounted on the support frame.

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