Prism imaging device for visual inspection of outer side wall of workpiece

Abstract

The utility model discloses a prism imaging device for visual inspection of an outer side wall of a workpiece, comprising a camera assembly which comprises a camera and a lens, the lens is connected with the camera, and the camera assembly is used for shooting a side wall image of the workpiece; the multiple light source mechanisms are arranged in the circumferential direction of the workpiece, and the light source mechanisms are used for conducting all-directional illumination on the workpiece when the camera assembly shoots the side wall image of the workpiece; and the prism module is located between the camera assembly and the light source mechanism, the center line of the prism module coincides with the center line of the camera assembly, and the prism module is used for guiding the light reflected by the workpiece to be capable of being received by the camera assembly so as to achieve one-time imaging. Through structural improvement, the number of cameras is remarkably reduced, a complete image of the side wall of a workpiece can be obtained at a time through one camera, the structural complexity is reduced, the cost is reduced, the visual detection efficiency is improved, and the debugging time of the camera is shortened.

Description

Technical Field

[0001] The utility model relates to the technical field of vision detection, and particularly relates to a prism imaging device for visual detection of the outer side wall of a workpiece. Background Art

[0002] With the rapid development of different industries, people's requirements for product quality are becoming increasingly strict. Visual detection is one of the important means to improve product quality, reduce production costs, and enhance the competitiveness of enterprises. For some small and complex-shaped workpieces, imaging of the side wall area of the workpiece has become a difficult problem. At present, the existing method is to use eight cameras for visual imaging detection of the side wall of the workpiece. The existing method uses a large number of cameras, resulting in a relatively complex overall structure of the prism imaging device for visual detection of the outer side wall of the workpiece, and also increasing the difficulty in spatial layout and cost control. After the number of cameras increases, the debugging process becomes more complex. Each camera needs to be debugged, and when imaging, the images collected by the eight cameras also need to be fused and processed, and the imaging processing steps are relatively complex. Therefore, it is necessary to improve the prism imaging device for visual detection of the outer side wall of the workpiece. Summary of the Utility Model

[0003] In order to solve the technical problems existing in the prior art, the utility model provides a prism imaging device for visual detection of the outer side wall of a workpiece.

[0004] The technical solution adopted by the utility model to solve its technical problems is: a prism imaging device for visual detection of the outer side wall of a workpiece, comprising:

[0005] A camera assembly, comprising a camera and a lens, the lens is connected to the camera, and the camera assembly is used for taking a side wall image of the workpiece;

[0006] A plurality of light source mechanisms, the plurality of light source mechanisms are arranged circumferentially around the workpiece, and the light source mechanisms are used for illuminating the workpiece omnidirectionally when the camera assembly takes a side wall image of the workpiece;

[0007] A prism module, the prism module is located between the camera assembly and the light source mechanism, the center line of the prism module coincides with the center line of the camera assembly, and the prism module is used for guiding the light reflected by the workpiece to be received by the camera assembly to achieve one-time imaging.

[0008] Further, the prism module includes at least one prism.

[0009] Further, the prism module includes: a cylindrical housing, and a first prism and a second prism disposed within the cylindrical housing. The first prism is configured to reflect the light reflected by the workpiece to the second prism, and the second prism is configured to reflect the light reflected by the first prism to the lens.

[0010] Further, the first prism and the second prism have different shapes.

[0011] Further, the irradiation angle of the light source mechanism is adjustable.

[0012] Further, the number of the light source mechanisms is eight.

[0013] Further, when the cross-section of the workpiece is circular, the eight light source mechanisms are evenly distributed circumferentially around the workpiece.

[0014] Further, when the cross-section of the workpiece is a rounded rectangle, four of the light source mechanisms are respectively aligned with the four long sides of the workpiece, and the other four light source mechanisms are respectively aligned with the four rounded corners of the workpiece.

[0015] Further, the light source mechanism includes at least one light source.

[0016] Further, the light source mechanism includes two light sources, and the irradiation angles of the two light sources on the workpiece are different.

[0017] The beneficial effects of the present utility model are as follows. The prism imaging device for visual inspection of the outer sidewall of a workpiece according to the present utility model, through structural improvement, only uses one camera, and the light reflected by the workpiece is guided to the lens through the prism module. A plurality of light source mechanisms are arranged around the workpiece to illuminate the workpiece, which is beneficial to improving the imaging quality. Through structural improvement, the present utility model significantly reduces the number of cameras. A complete image of the sidewall of the workpiece can be obtained at one time through one camera, which is beneficial to reducing the structural complexity, reducing the cost, improving the visual inspection efficiency, and reducing the debugging time of the camera. Description of the Drawings

[0018] The following further illustrates the present utility model in conjunction with the drawings and embodiments.

[0019] Figure 1 is a simplified schematic diagram of the prism imaging device for visual inspection of the outer sidewall of a workpiece according to the present utility model.

[0020] Figure 2 is a schematic diagram of the distribution of the light source mechanism on the circular sidewall according to the present utility model.

[0021] Figure 3 is a schematic diagram of the distribution of the light source mechanism on the rounded rectangular sidewall according to the present utility model.

[0022] Figure 4 This is a specific structural schematic diagram of the prism imaging device for visual inspection of the outer side wall of a workpiece in the present utility model.

[0023] Figure 5 This is a specific structural schematic diagram of the prism module of the present utility model.

[0024] In the figure: 1, camera; 2, lens; 3, prism module; 4, first light source; 5, second light source; 31, cylindrical housing; 32, first prism; 33, second prism. Specific embodiments

[0025] Now, the present utility model will be further described in detail with reference to the accompanying drawings. These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present utility model in a schematic manner, so they only show the components related to the present utility model.

[0026] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the present utility model. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more.

[0027] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0028] Such as Figures 1 to 3As shown in the figure, the prism imaging device for visual inspection of the outer side wall of a workpiece of the present utility model includes: a camera assembly, a plurality of light source mechanisms, and a prism module 3. The camera assembly includes a camera 1 and a lens 2, and the lens 2 is connected to the camera 1. The camera assembly is used to capture the side wall image of the workpiece. The plurality of light source mechanisms are arranged circumferentially around the workpiece, and the light source mechanisms are used to perform omnidirectional illumination on the workpiece when the camera assembly captures the side wall image of the workpiece. The prism module 3 is located between the camera assembly and the light source mechanisms, and the center line of the prism module 3 coincides with the center line of the camera assembly. The prism module 3 is used to guide the light reflected by the workpiece to be received by the camera assembly to achieve one-time imaging.

[0029] That is to say, the prism imaging device for visual inspection of the outer side wall of a workpiece of the present utility model only uses one camera 1. The prism module 3 guides the light reflected by the workpiece to be received by the lens 2. The plurality of light source mechanisms are arranged around the workpiece to illuminate the workpiece, which is beneficial to improving the imaging quality. Through structural improvement, the present utility model significantly reduces the number of cameras 1. A complete image of the workpiece can be obtained at one time through one camera 1 (saving the image fusion step), which is beneficial to reducing the structural complexity, reducing the cost, and improving the visual inspection efficiency.

[0030] In the present utility model, the workpiece mainly refers to a component with a side wall, and the shape of the side wall can be cylindrical, cubic, etc. For example, the workpiece is a micro camera or a nut on the back cover of a mobile phone. During visual inspection, the side wall of the micro camera or the side wall of the nut needs to be presented. These workpieces are relatively small in size. During visual inspection, the workpiece is placed on a stage. The camera assembly, the prism module 3, and the light source mechanisms are all fixed on a frame (not shown in the figure), and the irradiation angle of the light source mechanisms is adjustable (the angle adjustment structure can adopt structures such as a motor and a connecting block, for example. The light source is fixed on the connecting block, and the connecting block is connected to the output shaft of the motor. When the output shaft of the motor rotates, the irradiation angle of the light source can be changed. Of course, it can also be other structures that can achieve angle adjustment, which is not limited here).

[0031] In the present utility model, the function of the prism module 3 is to reflect the light irradiated on the workpiece to the camera assembly to achieve one-time imaging. The prism structure used in the prism module 3 can be set according to the shape of the workpiece to be detected currently. For example, the prism structure can adopt a polyhedron prism structure, and the reflecting surface of the prism can be vertical or inclined. In actual application, the prism module 3 can use only one prism, or a combination of two prisms with different shapes.

[0032] For example, in this embodiment, the number of light source mechanisms is eight. The eight light source mechanisms are arranged around the workpiece to ensure that the workpiece can be illuminated omnidirectionally. Of course, in practical applications, the number of light source mechanisms can be adjusted according to the working conditions. For example, when the cross-section of the workpiece is circular, the eight light source mechanisms are evenly distributed circumferentially around the workpiece. When the cross-section of the workpiece is a rounded rectangle, four light source mechanisms are respectively aligned with the four long sides of the workpiece, and the other four light source mechanisms are respectively aligned with the four rounded corners of the workpiece.

[0033] For example, the number of light sources included in the light source mechanism can be one or multiple, and can be set according to the shape of the workpiece and actual requirements. For example, when the light source mechanism includes two light sources, the irradiation angles of the two light sources on the workpiece are different.

[0034] As Figures 4 to 5 shown, in one embodiment, the light source mechanism includes a first light source 4 and a second light source 5. The number of both the first light source 4 and the second light source 5 is eight. One first light source 4 and one second light source 5 form a light source mechanism. For example, the first light source 4 is located above the second light source 5. The angle between the light emitted by the first light source 4 and the horizontal plane is 37°, and the light emitted by the second light source 5 is parallel to the horizontal plane. The first light source 4 serves as the main irradiation light source, and the second light source 5 serves as the supplementary irradiation light source to ensure the irradiation effect on the workpiece surface, thereby improving the imaging quality. In this embodiment, the prism module 3 includes: a cylindrical housing 31, and a first prism 32 and a second prism 33 disposed in the cylindrical housing 31. The first prism 32 is used to reflect the light reflected by the workpiece to the second prism 33, and the second prism 33 is used to reflect the light reflected by the first prism 32 to the lens 2. The first prism 32 is located below the second prism 33. For example, the number of both the first prism 32 and the second prism 33 is octahedron. In a vertical direction, there is one light source mechanism, one reflecting surface of the first prism 32, and one reflecting surface of the second prism 33. Among them, the angles of the reflecting surfaces of the first prism 32 and the second prism 33 are different.

[0035] For example, the angle between the reflecting surface of the first prism 32 and the horizontal plane is 78°, and the angle between the reflecting surface of the second prism 33 and the horizontal plane is 107°. The light emitted by the light source irradiates on the workpiece, is reflected by the workpiece surface to the first prism 32, and the first prism 32 then reflects the light to the opposite second prism 33, and then the second prism 33 reflects the light to the lens 2. For example, the working distance of the lens 2 is 300 mm; the camera 1 uses a 65-megapixel color camera, and the exposure time is set to 10000 μs.

[0036] In summary, for the prism imaging device for visual inspection of the outer side wall of a workpiece according to the present utility model, through structural improvement, only one camera 1 is adopted, and the light reflected by the workpiece is guided to the lens 2 through the prism module 3. A plurality of light source mechanisms are arranged around the workpiece to illuminate the workpiece, which is beneficial to improving the imaging quality. Through structural improvement, the present utility model significantly reduces the number of cameras 1. The complete image of the workpiece can be obtained at one time through one camera 1, which is beneficial to reducing the structural complexity, reducing the cost, improving the visual inspection efficiency, and reducing the debugging time of the camera 1.

[0037] Inspired by the above ideal embodiments of the present utility model, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of the present utility model. The technical scope of the present utility model is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A prism imaging device for visual inspection of the outer wall of a workpiece, characterized in that: include: A camera assembly, comprising a camera (1) and a lens (2), wherein the lens (2) is connected to the camera (1), and the camera assembly is used to capture an image of a side wall of a workpiece; A plurality of light source mechanisms, wherein the plurality of light source mechanisms are arranged circumferentially around the workpiece, and the light source mechanisms are used to illuminate the workpiece in all directions when the camera assembly captures an image of the side wall of the workpiece; A prism module (3), wherein the prism module (3) is located between the camera assembly and the light source mechanism, the center line of the prism module (3) coincides with the center line of the camera assembly, and the prism module (3) is used to guide the light reflected by the workpiece to a point where it can be received by the camera assembly to achieve one-time imaging.

2. The prism imaging device for visual inspection of the outer wall of a workpiece according to claim 1, characterized in that: The prism module (3) comprises at least one prism.

3. The prism imaging device for visual inspection of the outer wall of a workpiece according to claim 1, characterized in that: The prism module (3) comprises: a cylindrical shell (31), and a first prism (32) and a second prism (33) arranged in the cylindrical shell (31), wherein the first prism (32) is used to reflect light reflected by a workpiece to the second prism (33), and the second prism (33) is used to reflect light reflected by the first prism (32) to the lens (2).

4. The prism imaging device for visual inspection of the outer wall of a workpiece according to claim 3, characterized in that: The first prism (32) and the second prism (33) have different shapes.

5. The prism imaging device for visual inspection of the outer wall of a workpiece according to claim 1, characterized in that: The irradiation angle of the light source mechanism is adjustable.

6. The prism imaging device for visual inspection of the outer wall of a workpiece according to claim 1, characterized in that: The number of the light source mechanisms is eight.

7. The prism imaging device for visual inspection of the outer wall of a workpiece according to claim 6, characterized in that: When the cross section of the workpiece is circular, the eight light source mechanisms are evenly distributed around the circumference of the workpiece.

8. The prism imaging device for visual inspection of the outer wall of a workpiece according to claim 6, characterized in that: When the cross section of the workpiece is a rounded rectangle, four of the light source mechanisms are respectively aligned with the four long sides of the workpiece, and the other four light source mechanisms are respectively aligned with the four arc corners of the workpiece.

9. The prism imaging device for visual inspection of the outer wall of a workpiece according to claim 1, characterized in that: The light source mechanism comprises at least one light source.

10. The prism imaging device for visual inspection of the outer wall of a workpiece according to claim 9, characterized in that: The light source mechanism comprises two light sources, and the two light sources have different irradiation angles on the workpiece.

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