Coaxial light source device for workpiece appearance detection

Abstract

The utility model discloses a coaxial light source device for workpiece appearance detection, which comprises a shell, the shell comprises a cavity penetrating through the front end and the rear end of the shell, the rear end of the cavity is aligned with a preset industrial camera, the front end of the cavity is aligned with a workpiece to be detected, a translucent mirror is arranged in the cavity, and the translucent mirror is arranged in the shell. The semi-permeable mirror is obliquely arranged between two opposite angles of the cavity, the industrial camera shoots an image of a workpiece to be detected through the semi-permeable mirror, a light source module is arranged on the side portion of the shell, the light emitting side of the light source module faces the reflecting face of the semi-permeable mirror, and the light emitting side of the light source module faces the reflecting face of the semi-permeable mirror. And light emitted by the light source module is reflected by the semitransparent mirror and then irradiates a workpiece to be detected. According to the utility model, the defect characteristics on the surface of the workpiece can be clearly imaged, the camera is helped to acquire more image information, and the appearance detection accuracy can be effectively improved.

Description

Technical Field

[0001] This utility model relates to a workpiece visual inspection device, and more particularly to a coaxial light source device for workpiece appearance inspection. Background Technology

[0002] In visual inspection systems, industrial cameras are typically used in conjunction with light sources for image capture and inspection. A light source is a device or object that generates light radiation, making the surrounding environment visible. In industrial inspection, selecting a suitable light source is crucial for generating stable and clear images, facilitating optimal separation of the target from the background, thereby reducing image processing complexity and improving system accuracy and reliability. Currently, in workpiece surface defect inspection, light sources are generally placed close to the industrial environment, typically employing bright-field or dark-field illumination. However, for certain defect types, the image clarity is significantly affected by the range of the bright-field or dark-field optical path, failing to meet the defect inspection needs of different scenarios and thus limiting the inspection performance of appearance inspection equipment. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a coaxial light source device that can clearly image the surface defect features of workpieces, help the camera to collect more image information, and improve the accuracy of appearance inspection, in order to address the shortcomings of the existing technology.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution.

[0005] A coaxial light source device for workpiece appearance inspection includes a housing with cavities extending through its front and rear ends. The rear end of the cavity is aligned with a preset industrial camera, and the front end of the cavity is aligned with the workpiece to be inspected. A semi-transparent lens is disposed within the cavity, and the semi-transparent lens is obliquely disposed between two opposite corners of the cavity. The industrial camera captures an image of the workpiece to be inspected through the semi-transparent lens. A light source module is disposed on the side of the housing, with the light-emitting side of the light source module facing the reflective surface of the semi-transparent lens. The light emitted by the light source module is reflected by the semi-transparent lens and then illuminates the workpiece to be inspected.

[0006] Preferably, the shell is a cuboid shell.

[0007] Preferably, the housing includes a left side shell and a right side shell arranged symmetrically, and the left side shell and the right side shell are respectively provided with oblique slots, and the edge of the semi-transparent lens is engaged in the oblique slots.

[0008] Preferably, a mirror frame is fixed to the rear end of the housing, and a lens is embedded in the mirror frame.

[0009] Preferably, the side of the housing is provided with a light source support plate, and the light source module is fixed between the light source support plate, the left side housing and the right side housing.

[0010] Preferably, a light-diffusing plate is fixed between the light source support plate, the left side shell, and the right side shell. The light-diffusing plate covers the light-emitting side of the light source module, and a preset distance is formed between the light-diffusing plate and the light source module.

[0011] Preferably, the light source module includes a driver board, an LED light source array is provided on the front side of the driver board, a thermally conductive silicone grease layer is attached to the back side of the driver board, and a heat sink is attached to the side of the thermally conductive silicone grease layer facing away from the driver board.

[0012] In the coaxial light source device for workpiece appearance inspection disclosed in this utility model, the housing serves as the outer shell of the light source, with a through-light path between its front and rear ends. An inclined semi-lens is disposed within the housing. To avoid affecting the direction of the emitted and reflected light, the semi-lens is inclined between two opposite corners of the cavity. The light source module is disposed on the side of the housing and faces the reflective surface of the semi-lens. When the light source module emits light, the light is reflected by the semi-lens and illuminates the workpiece to be inspected, thus achieving illumination. Simultaneously, the industrial camera captures an image of the workpiece through the semi-lens. Therefore, the light source module constitutes a coaxial light source for the industrial camera. Based on the above light path arrangement, this utility model can clearly image the surface defect features of the workpiece, helping the camera to acquire more image information and effectively improving the accuracy of appearance inspection. Attached Figure Description

[0013] Figure 1 The three-dimensional coaxial light source device for workpiece appearance inspection according to this utility model Figure 1 ;

[0014] Figure 2 The three-dimensional coaxial light source device for workpiece appearance inspection according to this utility model Figure 2 ;

[0015] Figure 3 This is an exploded view of the coaxial light source device for workpiece appearance inspection according to this utility model;

[0016] Figure 4 This is an exploded view of the light source module. Detailed Implementation

[0017] The present invention will now be described in more detail with reference to the accompanying drawings and embodiments.

[0018] This utility model discloses a coaxial light source device for workpiece appearance inspection, combined with... Figures 1 to 4As shown, it includes a housing 1, which includes cavities 2 extending through its front and rear ends. The rear end of the cavity 2 is aligned with a preset industrial camera, and the front end of the cavity 2 is aligned with the workpiece to be inspected. A semi-transparent lens 3 is provided inside the cavity 2, and the semi-transparent lens 3 is obliquely positioned between two opposite corners of the cavity 2. The industrial camera captures an image of the workpiece to be inspected through the semi-transparent lens 3. A light source module 4 is provided on the side of the housing 1, with the light-emitting side of the light source module 4 facing the reflective surface of the semi-transparent lens 3. The light emitted by the light source module 4 is reflected by the semi-transparent lens 3 and then illuminates the workpiece to be inspected.

[0019] In the above structure, the housing 1 serves as the outer shell of the light source, with a through-light path between its front and rear ends. An inclined semi-transparent lens 3 is disposed within the housing 1. To avoid affecting the direction of the emitted and reflected light, the semi-transparent lens 3 is inclined between two opposite corners of the cavity 2. The light source module 4 is disposed on the side of the housing 1 and faces the reflective surface of the semi-transparent lens 3. When the light source module 4 emits light, the light is reflected by the semi-transparent lens 3 and illuminates the workpiece to be inspected, thus achieving illumination. Simultaneously, the industrial camera captures an image of the workpiece through the semi-transparent lens 3. Therefore, the light source module 4 constitutes a coaxial light source for the industrial camera. Based on the above light path arrangement, this invention enables clear imaging of surface defect features of the workpiece, helps the camera acquire more image information, and effectively improves the accuracy of appearance inspection.

[0020] As a preferred method, please refer to Figure 1 and Figure 2 The shell 1 is a rectangular parallelepiped shell. For details, please refer to... Figure 2 The housing 1 includes a left shell 10 and a right shell 11 arranged symmetrically. The left shell 10 and the right shell 11 are respectively provided with oblique slots 12, and the edge of the semi-transparent lens 3 is engaged in the oblique slots 12.

[0021] In the above structure, by providing the oblique slot 12 on the left shell 10 and the right shell 11, the semi-transparent lens 3 can be fixed in place. At the same time, the oblique slot 12 extends along the diagonal direction of the left shell 10 and the right shell 11, thereby limiting the tilt direction of the semi-transparent lens 3.

[0022] For a preferred structure, please refer to Figure 3 The rear end of the housing 1 is fixed with a mirror frame 5, and a lens 6 is embedded in the mirror frame 5.

[0023] In this embodiment, a light source support plate 7 is provided on the side of the housing 1, and the light source module 4 is fixed between the light source support plate 7, the left side housing 10, and the right side housing 11. The light source support plate 7, in addition to supporting the light source module 4, can also support a light-diffusing plate 8. Specifically, a light-diffusing plate 8 is fixed between the light source support plate 7, the left side housing 10, and the right side housing 11. The light-diffusing plate 8 covers the light-emitting side of the light source module 4, and a predetermined distance is formed between the light-diffusing plate 8 and the light source module 4.

[0024] For the preferred structure of the light source module 4, please refer to [link / reference]. Figure 4 The light source module 4 includes a driver board 40, with an LED light source array on the front side of the driver board 40. A thermally conductive silicone grease layer 41 is attached to the back side of the driver board 40, and a heat sink 42 is attached to the side of the thermally conductive silicone grease layer 41 facing away from the driver board 40. The thermally conductive silicone grease layer 41 can improve the heat transfer efficiency between the heat sink 42 and the driver board 40.

[0025] In a preferred embodiment of this utility model, the light source module is composed of 46 LED strip light sources. Each light source is connected to the peripheral driving circuit, which can realize independent control of each strip light source. The range of the dark field and bright field light path can be flexibly adjusted according to actual needs, so that the camera can capture clear and recognizable image information. In addition, the back of the light source is coated with thermal grease and fixed on the aluminum block. A heat dissipation metal plate is connected to the back of the aluminum block to increase the heat dissipation area.

[0026] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. All modifications, equivalent substitutions or improvements made within the technical scope of the present utility model should be included within the scope of protection of the present utility model.

Claims

1. A coaxial light source device for workpiece appearance inspection, characterized in that, The device includes a housing (1), which includes cavities (2) extending through its front and rear ends. The rear end of the cavity (2) is aligned with a preset industrial camera, and the front end of the cavity (2) is aligned with the workpiece to be inspected. A semi-transparent lens (3) is provided inside the cavity (2), and the semi-transparent lens (3) is tilted between two opposite corners of the cavity (2). The industrial camera captures an image of the workpiece to be inspected through the semi-transparent lens (3). A light source module (4) is provided on the side of the housing (1), with the light-emitting side of the light source module (4) facing the reflecting surface of the semi-transparent lens (3). The light emitted by the light source module (4) is reflected by the semi-transparent lens (3) and then illuminates the workpiece to be inspected.

2. The coaxial light source device for workpiece appearance inspection as described in claim 1, characterized in that, The shell (1) is a rectangular shell.

3. The coaxial light source device for workpiece appearance inspection as described in claim 1, characterized in that, The housing (1) includes a left shell (10) and a right shell (11) arranged symmetrically. The left shell (10) and the right shell (11) are respectively provided with oblique slots (12), and the edge of the semi-transparent lens (3) is engaged in the oblique slots (12).

4. The coaxial light source device for workpiece appearance inspection as described in claim 1, characterized in that, The rear end of the housing (1) is fixed with a mirror frame (5), and a lens (6) is embedded in the mirror frame (5).

5. The coaxial light source device for workpiece appearance inspection as described in claim 3, characterized in that, The side of the housing (1) is provided with a light source support plate (7), and the light source module (4) is fixed between the light source support plate (7), the left side housing (10) and the right side housing (11).

6. The coaxial light source device for workpiece appearance inspection as described in claim 5, characterized in that, A light-diffusing plate (8) is fixed between the light source support plate (7), the left side shell (10) and the right side shell (11). The light-diffusing plate (8) covers the light-emitting side of the light source module (4), and a preset distance is formed between the light-diffusing plate (8) and the light source module (4).

7. The coaxial light source device for workpiece appearance inspection as described in claim 1, characterized in that, The light source module (4) includes a driver board (40), an LED light source array is provided on the front side of the driver board (40), a thermally conductive silicone grease layer (41) is attached to the back side of the driver board (40), and a heat sink (42) is attached to the side of the thermally conductive silicone grease layer (41) facing away from the driver board (40).

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