Appearance inspection optical device

Abstract

The application provides an appearance detection optical device, comprising: a mounting frame comprising a first mounting assembly and a second mounting assembly spaced apart from each other; a first detection module mounted on the first mounting assembly, comprising a first light source emitting a first light, and used for shooting a first image of a workpiece under irradiation of the first light; and a second detection module mounted on the second mounting assembly, comprising a second light source emitting a second light, and used for shooting a second image of the workpiece under irradiation of the second light, wherein the first light source and the second light source have different structures, so that the first light and the second light have different shapes and / or different wavelengths, thereby making the first image and the second image comprise different appearance features of the workpiece.

Description

Technical Field

[0001] This application relates to the field of workpiece inspection technology, and in particular to an optical device for appearance inspection. Background Technology

[0002] Currently, optical systems for appearance inspection have limited types of light sources and lenses, restrict the types of items that can be inspected, and have fixed application scenarios, resulting in a lack of versatility. Utility Model Content

[0003] This application provides an optical device for appearance inspection, comprising: a mounting frame including a first mounting component and a second mounting component spaced apart from each other; a first detection module mounted on the first mounting component, including a first light source emitting a first light for capturing a first image of a workpiece under the illumination of the first light; and a second detection module mounted on the second mounting component, including a second light source emitting a second light for capturing a second image of the workpiece under the illumination of the second light, wherein the first light source and the second light source have different structures, such that the first light and the second light have different shapes and / or different wavelengths, thereby making the first image and the second image include different appearance features of the workpiece.

[0004] In at least one embodiment of this application, the mounting bracket includes a fixed plate and an extension plate, the edges of the fixed plate and the extension plate are fixedly connected, and the fixed plate is perpendicular to the extension plate; the first mounting component and the second mounting component are spaced apart and disposed on the same surface of the extension plate.

[0005] In at least one embodiment of this application, the first mounting component and / or the second mounting component are detachably disposed on the extension plate.

[0006] In at least one embodiment of this application, the first detection module is detachably mounted on the first mounting assembly; and / or the second detection module is detachably mounted on the second mounting assembly.

[0007] In at least one embodiment of this application, the first detection module further includes a first lens and a first camera, the first lens being located between the first light source and the first camera, and the first camera and the first lens being used to acquire the first image when the first light source emits the first light; the second detection module further includes a second lens and a second camera, the second lens being located between the second light source and the second camera, and the second camera and the second lens being used to acquire the second image when the second light source emits the second light.

[0008] In at least one embodiment of this application, the optical axis of the first lens is parallel to the optical axis of the second lens.

[0009] In at least one embodiment of this application, the first camera has a first photosensitive surface facing the first lens, and the optical axis of the first lens is perpendicular to the first photosensitive surface and passes through the geometric center of the first photosensitive surface; the second camera has a second photosensitive surface facing the second lens, and the optical axis of the second lens is perpendicular to the second photosensitive surface and passes through the geometric center of the second photosensitive surface.

[0010] In at least one embodiment of this application, the second detection module further includes a third light source for emitting third light, and the second camera and the second lens are used to acquire a third image when the third light source emits the third light.

[0011] In at least one embodiment of this application, the first light source is a ring light source, the second light source is a dome light source, and the first light and the second light are white light.

[0012] In at least one embodiment of this application, the resolution of the first camera is less than the resolution of the second camera.

[0013] The aforementioned optical device for appearance inspection includes a first detection module and a second detection module. The first detection module includes a first light source that emits a first light, and the second detection module includes a second light source that emits a second light. The first light source and the second light source have different structures, and / or the first light and the second light have different wavelengths, so that the first detection module and the second detection module can respectively capture a first image and a second image of the workpiece to obtain different appearance features of the workpiece. Therefore, the aforementioned optical device for appearance inspection can meet more inspection needs, adapt to a variety of different inspection scenarios, and has strong versatility. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the appearance inspection optical device according to an embodiment of this application.

[0015] Figure 2 for Figure 1 A three-dimensional structural diagram of the mounting bracket.

[0016] Explanation of main component symbols

[0017] Appearance inspection optical device: 1; Second camera bracket: 134; Mounting frame: 10; Second fixing part: 1341; Vertical plate: 11; Second mounting part: 1342; Fixing plate: 111; U-shaped hole: 14; Extension plate: 112; First inspection module: 20; First fixing hole: 113; First light source: 21; Second fixing hole: 114; First lens: 22; First mounting assembly: 12; First camera: 23; First light source bracket: 121; First photosensitive surface: 231; Lens bracket: 122; Second detection module: 30; First camera bracket: 123; Second light source: 31; First fixing part: 1231; Third light source: 32; First mounting part: 1232; Second lens: 33; Second mounting assembly: 13; Second camera: 34; Second light source bracket: 131; Second photosensitive surface: 341; Third light source bracket: 132; Openings: 1211, 1221, 1311, 1321, 1331; Second lens bracket: 133.

[0018] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this application. Detailed Implementation

[0019] This application provides an optical device for appearance inspection, including at least two detection optical paths with different structures. The at least two detection optical paths are used to capture different images of the workpiece to obtain different appearance features of the workpiece. Therefore, the optical device for appearance inspection of this application can be adapted to a variety of different inspection scenarios.

[0020] Please see Figure 1 The appearance inspection optical device 1 of this application embodiment includes a mounting frame 10, a first inspection module 20, and a second inspection module 30. The first inspection module 20 and the second inspection module 30 are respectively disposed at intervals on the mounting frame 10. The first inspection module 20 is used to acquire a first image of a workpiece (not shown), and the second inspection module 30 is used to acquire a second image of the workpiece. By using different light sources to illuminate the workpiece, the first image and the second image can present different appearance features of the workpiece.

[0021] Please see Figure 2The mounting bracket 10 includes a vertical plate 11, a first mounting component 12, and a second mounting component 13, which are disposed on the vertical plate 11. In this embodiment, the vertical plate 11 includes a fixing plate 111 and an extension plate 112. The fixing plate 111 and the extension plate 112 are fixedly connected at their edges and are perpendicular to each other. The fixing plate 111 and the extension plate 112 each have a hollowed-out area. The fixing plate 111 can be used to fix the appearance inspection optical device 1 as a whole to other mechanisms on the production line. The first mounting component 12 and the second mounting component 13 are spaced apart and connected to the same surface of the extension plate 112. In this embodiment, the first mounting component 12 and the second mounting component 13 are detachably connected to the same surface of the extension plate 112.

[0022] The first mounting assembly 12 includes a first light source bracket 121, a first lens bracket 122, and a first camera bracket 123 spaced apart, with the first lens bracket 122 located between the first light source bracket 121 and the first camera bracket 123. The first light source bracket 121 has an opening 1211, and the first lens bracket 122 has an opening 1221. In this embodiment, both openings 1211 and 1221 are circular, and the line connecting the centers of the two openings is parallel to the fixing plate 111. The first camera bracket 123 is generally an "L"-shaped bracket. That is, the first camera bracket 123 includes an integrally formed first fixing part 1231 and a first mounting part 1232, both of which are thin plate structures and perpendicular to each other. The first fixing part 1231 is parallel to and connected to the extension plate 112, and the first mounting part 1232 is parallel to the fixing plate 111.

[0023] In this embodiment, the first light source bracket 121, the first lens bracket 122, and the first camera bracket 123 are all detachably connected to the extension plate 112. In other embodiments of this application, the first light source bracket 121, the first lens bracket 122, and the first camera bracket 123 may be partially detachably connected to the extension plate 112, and the other part may be fixedly connected to the extension plate 112. For example, in at least one embodiment of this application, the first light source bracket 121 and the first lens bracket 122 are detachably connected to the extension plate 112, while the first camera bracket 123 is fixedly connected to the extension plate 112.

[0024] The second mounting assembly 13 includes a second light source bracket 131, a third light source bracket 132, a second lens bracket 133, and a second camera bracket 134 arranged at intervals, with the third light source bracket 132, second light source bracket 131, second lens bracket 133, and second camera bracket 134 arranged sequentially. The second light source bracket 131 has an opening 1311, the third light source bracket 132 has an opening 1321, and the second lens bracket 133 has an opening 1331. In this embodiment, openings 1311, 1321, and 1331 are all circular openings, and the centers of openings 1311, 1321, and 1331 are on a straight line, with the line connecting the centers of openings 1311, 1321, and 1331 parallel to the fixing plate 111. The second camera bracket 134 is generally an "L"-shaped bracket. That is, the second camera bracket 134 includes an integrally formed second fixing part 1341 and a second mounting part 1342. Both the second fixing part 1341 and the second mounting part 1342 are thin plate structures and are perpendicular to each other. The second fixing part 1341 is parallel to and connected to the extension plate 112, and the second mounting part 1342 is parallel to the fixing plate 111.

[0025] In this embodiment, the second light source bracket 131, the third light source bracket 132, the second lens bracket 133, and the second camera bracket 134 are all detachably connected to the extension plate 112. In other embodiments of this application, the second light source bracket 131, the third light source bracket 132, the second lens bracket 133, and the second camera bracket 134 may be partially detachably connected to the extension plate 112, and the other part may be fixedly connected to the extension plate 112. For example, in at least one embodiment of this application, the second light source bracket 131, the third light source bracket 132, and the second lens bracket 133 are detachably connected to the extension plate 112, while the second camera bracket 134 is fixedly connected to the extension plate 112.

[0026] Please refer to the following: Figure 1 and Figure 2The first detection module 20 is mounted on the first mounting assembly 12. The first detection module 20 includes a first light source 21, a first lens 22, and a first camera 23. The first light source 21 is mounted in the opening 1211 of the first light source bracket 121, the first lens 22 is mounted in the opening 1221 of the first lens bracket 122, and the first camera 23 is mounted on the first mounting portion 1232 of the first camera bracket 123. The first camera 23 has a first photosensitive surface 231. When the first camera 23 is mounted on the first camera bracket 123, the first photosensitive surface 231 faces the first lens 22 and is perpendicular to the fixing plate 111 and the extension plate 112. The optical axis of the first lens 22 is perpendicular to the first photosensitive surface 231 and passes through the geometric center of the first photosensitive surface 231 (when the first photosensitive surface 231 is rectangular, the geometric center is the intersection of the diagonals; when the photosensitive surface is circular, the geometric center is the center of the circle) and the center of the opening 1211.

[0027] In this embodiment, the first light source 21 is detachably installed in the opening 1211 of the first light source bracket 121, the first lens 22 is detachably installed in the opening 1221 of the first lens bracket 122, and the first camera 23 is detachably installed on the first mounting part 1232.

[0028] In this embodiment, the first light source 21 is an overall ring light source, used to emit first light towards the center of the ring, and the first light is white light. The workpiece located within the illumination range of the first light can reflect the first light. The first lens 22 is used to collect the first light reflected by the workpiece onto the first photosensitive surface 231 of the first camera 23. The first camera 23 generates a first image based on the first light from the first lens 22.

[0029] During the operation of the first detection module 20, the workpiece is placed at the center of the first light source 21, so that the annular first light source 21 can illuminate the workpiece from a 360° direction. In this embodiment, the first camera 23 is used to acquire four first images of the workpiece from four directions (e.g., 0°, 90°, 180°, and 270° angular directions), thereby obtaining the complete appearance features of the workpiece surface.

[0030] The second detection module 30 is mounted on the second mounting assembly 13. The second detection module 30 includes a second light source 31, a third light source 32, a second lens 33, and a second camera 34. The second light source 31 is mounted in the opening 1311 of the second light source bracket 131, the third light source 32 is mounted in the opening 1321 of the third light source bracket 132, the second lens 33 is mounted in the opening 1331 of the second lens bracket 133, and the second camera 34 is mounted on the second mounting portion 1342 of the second camera bracket 134. The second camera 34 has a second photosensitive surface 341. When the second camera 34 is mounted on the second camera bracket 134, the second photosensitive surface 341 faces the second lens 33 and is perpendicular to the fixing plate 111 and the extension plate 112. The optical axis of the second lens 33 is perpendicular to the second photosensitive surface 341 and passes through the geometric center of the second photosensitive surface 341 (when the second photosensitive surface 341 is rectangular, the geometric center is the intersection of the diagonals; when the photosensitive surface is circular, the geometric center is the center of the circle), the center of the opening 1311, and the center of the opening 1321.

[0031] In this embodiment, the second light source 31 is detachably installed in the opening 1311 of the second light source bracket 131, the third light source 32 is detachably installed in the opening 1321 of the third light source bracket 132, the second lens 33 is detachably installed in the opening 1331 of the second lens bracket 133, and the second camera 34 is detachably installed in the second mounting part 1342.

[0032] In this embodiment, the second light source 31 is a dome light source used to emit a second light, which is white light. Workpieces located within the illumination range of this second light can reflect it. The second lens 33 is used to collect the second light reflected from the workpiece onto the second photosensitive surface 341 of the second camera 34. The second camera 34 generates a second image based on the second light from the second lens 33.

[0033] In this embodiment, the third light source 32 is a UV light source used to emit a third light, which is UV light. Workpieces located within the illumination range of this third light can reflect it. The second lens 33 is used to collect the third light reflected from the workpiece onto the second photosensitive surface 341 of the second camera 34. The second camera 34 generates a third image based on the third light from the second lens 33.

[0034] In this embodiment, the first light source 21, the second light source 31 and the third light source 32 all include light-emitting diodes as light-emitting elements.

[0035] During the operation of the second detection module 30, the workpiece is placed on the side of the third light source 32 away from the second light source 31. The second light source 31 and the third light source 32 are turned on in a time-sharing manner, so that the second light and the third light illuminate the workpiece in a time-sharing manner, so that the second camera 34 can capture the second image and the third image in a time-sharing manner.

[0036] In this embodiment, the first light source bracket 121, the first mounting part 1232, the second light source bracket 131, the third light source bracket 132, and the second mounting part 1342 are all connected to the extension plate 112 through multiple U-shaped holes 14. The length extension direction of each U-shaped hole 14 is parallel to the optical axis of the first lens 22 and the second lens 33, so that the first light source bracket 121 and the first camera bracket 123 can move up and down along the optical axis of the first lens 22, and the second light source bracket 131, the third light source bracket 132, and the second camera bracket 134 can move up and down along the optical axis of the second lens 33, thereby driving the first light source 21 and the first camera 23 to move up and down along the optical axis of the first lens 22, and the second light source 31, the third light source 32, and the second camera 34 to move up and down along the optical axis of the second lens 33.

[0037] In this embodiment, the extension plate 112 also has a plurality of first fixing holes 113 and second fixing holes 114. At least some of the first fixing holes 113 are arranged sequentially at intervals along the optical axis of the first lens 22. Therefore, when the first lens bracket 122 is connected to the extension plate 112 through the first fixing holes 113 at different heights, the position of the first lens 22 is different. At least some of the second fixing holes 114 are arranged sequentially at intervals along the optical axis of the second lens 33. Therefore, when the second lens bracket 133 is connected to the extension plate 112 through the second fixing holes 114 at different heights, the position of the second lens 33 is different.

[0038] In this embodiment, under the first light illumination, the appearance features of the acquired first image include at least the height features of the workpiece surface, which can be used to assess whether there are pits, scratches, etc. on the workpiece surface. Under the second light illumination, the appearance features of the acquired second image include at least the planar features of the workpiece surface. Under the third light illumination, the acquired third image includes at least the dispensing features of the workpiece surface.

[0039] In this embodiment, the optical axes of the first lens 22 and the second lens 33 are parallel, and the first camera 23 and the second camera 34 are oriented in the same direction. Therefore, the workpiece can be placed on the same side of the first detection module 20 and the second detection module 30. By simply moving the workpiece, the first image, the second image and the third image can be captured respectively.

[0040] In this embodiment, the resolution requirement for the first image is lower than that for the second and third images. Therefore, the first camera 23 has a lower resolution than the second camera 34. In this embodiment, the first detection module 20 requires a larger field of view than the second detection module 30. Therefore, the first lens 22 and the second lens 33 have different operating parameters (including magnification, field of view, etc.).

[0041] In other embodiments of this application, the second mounting component 13 may include only one of the second light source bracket 131 and the second light source bracket 131. Correspondingly, the second detection module 30 may include only one of the second light source 31 and the third light source 32, for capturing a second image or a third image.

[0042] In other embodiments of this application, the number of light sources included in the first detection module 20 and the second detection module 30 may be different. Correspondingly, the number of light source supports included in the first mounting assembly 12 and the second mounting assembly 13 may be different. In other embodiments of this application, the appearance inspection optical device 1 may include a greater number of detection optical paths and mounting assemblies.

[0043] In other embodiments of this application, the structural configuration of the first light source 21, the second light source 31, and the third light source 32 may differ from that in this embodiment. One of the first light source 21, the second light source 31, and the third light source 32 may be a white ring light source, one may be a white dome light source, and the other may be a UV light source. In other embodiments of this application, light sources with other structures may also be selected based on the required appearance features of the workpiece.

[0044] In other embodiments of this application, the parameters of the first lens 22 and the second lens 33 may be the same, and the parameters of the first camera 23 and the second camera 34 may also be the same. Lenses and cameras with different parameters and types can be used for different workpieces and different detection scenarios. Lens parameters include magnification and field of view, while camera parameters include resolution.

[0045] In at least one modified embodiment of this application, the appearance inspection optical device 1 can be used to detect surface dents, scratches, UV adhesive, etc. on the shielding frame.

[0046] The aforementioned optical device 1 for appearance inspection includes a first detection module 20 and a second detection module 30. The first detection module 20 includes a first light source 21 that emits first light, and the second detection module 30 includes a second light source 31 that emits second light. The first light source 21 and the second light source 31 have different structures (one is a ring light source, and the other is a dome light source) to emit first light and second light of different forms (one is ring light, and the other is dome light), so that the first detection module 20 and the second detection module 30 can respectively capture first images and second images of the workpiece to obtain different appearance features of the workpiece. Therefore, the optical device 1 for appearance inspection of this application embodiment can meet more inspection needs and can adapt to a variety of different inspection scenarios.

[0047] Based on this, the embodiments of this application, by setting a U-shaped hole 14, a first fixing hole 113 and a second fixing hole 114, allow for up-and-down adjustment along the optical axis of the lens, which helps the appearance inspection optical device 1 to meet more inspection needs and adapt to more inspection scenarios.

[0048] Those skilled in the art should recognize that the above embodiments are only used to illustrate this application and are not intended to limit this application. Any appropriate changes and variations made to the above embodiments within the essential spirit and scope of this application fall within the scope of protection claimed by this application.

Claims

1. An optical device for appearance inspection, characterized in that, include: The mounting bracket includes a fixed plate, an extension plate, a first mounting component, and a second mounting component. The edges of the fixed plate and the extension plate are fixedly connected, and the fixed plate is perpendicular to the extension plate. The first mounting component and the second mounting component are spaced apart on the same surface of the extension plate. A first detection module is installed on the first mounting assembly and includes a first light source that emits first light for capturing a first image of a workpiece under the illumination of the first light. as well as The second detection module, installed on the second mounting assembly, includes a second light source that emits a second light for capturing a second image of the workpiece under the illumination of the second light. The first light source and the second light source have different structures, so that the first light and the second light have different shapes and / or different wavelengths, thereby making the first image and the second image include different appearance features of the workpiece.

2. The appearance inspection optical device as described in claim 1, characterized in that, The first mounting component and / or the second mounting component are detachably mounted on the extension plate.

3. The appearance inspection optical device as described in claim 1, characterized in that, The first detection module is detachably mounted on the first mounting assembly; and / or The second detection module is detachably mounted on the second mounting assembly.

4. The appearance inspection optical device as described in claim 1, characterized in that, The first detection module further includes a first lens and a first camera. The first lens is located between the first light source and the first camera. When the first light source emits the first light, the first camera and the first lens are used to acquire the first image. The second detection module further includes a second lens and a second camera. The second lens is located between the second light source and the second camera. When the second light source emits the second light, the second camera and the second lens are used to acquire the second image.

5. The appearance inspection optical device as described in claim 4, characterized in that, The optical axis of the first lens is parallel to the optical axis of the second lens.

6. The appearance inspection optical device as described in claim 4, characterized in that, The first camera has a first photosensitive surface facing the first lens, and the optical axis of the first lens is perpendicular to the first photosensitive surface and passes through the geometric center of the first photosensitive surface; The second camera has a second photosensitive surface facing the second lens, and the optical axis of the second lens is perpendicular to the second photosensitive surface and passes through the geometric center of the second photosensitive surface.

7. The appearance inspection optical device as described in claim 4, characterized in that, The second detection module further includes a third light source for emitting third light, and the second camera and the second lens are used to acquire a third image when the third light is emitted by the third light source.

8. The appearance inspection optical device as described in claim 4, characterized in that, The first light source is a ring light source, the second light source is a dome light source, and both the first light and the second light are white light.

9. The appearance inspection optical device as described in claim 8, characterized in that, The resolution of the first camera is smaller than that of the second camera.

Images