A light source arrangement for visual inspection

Abstract

The application discloses a light source device for visual detection, comprising a shell, a first light source assembly, a beam splitter and a double-lens assembly. The shell has a containing cavity, a detection port and an exit port which are communicated with the containing cavity. The first light source assembly is arranged in the containing cavity. The beam splitter is arranged in the containing cavity and located on the light exit path of the first light source assembly, used for reflecting the light emitted by the first light source assembly to the exit port and allowing the imaging light returned from the exit port to be transmitted to the detection port. The double-lens assembly is arranged between the first light source assembly and the beam splitter and comprises a first lens and a second lens which are coaxially arranged in sequence along the light path direction. The focal length of the first lens is smaller than that of the second lens. The application can provide a linear light band with high uniformity of brightness distribution and improve the image acquisition quality.

Description

Technical Field

[0001] This utility model relates to the field of light source detection device technology, and in particular to a light source device for visual inspection. Background Technology

[0002] In the field of automated visual inspection, the detection of surface defects in large-format roll materials such as flat panel displays, printed materials, and lithium battery separators typically employs a line scan camera combined with a linear light source for high-speed continuous scanning. In such systems, the quality of the illumination scheme is a key factor determining image quality and defect detection rate.

[0003] In related technologies, linear light source schemes typically consist of LED arrays combined with homogenizing plates or ordinary lenses. However, these schemes struggle to create a uniform linear light field over a large width (e.g., 150mm or more), often resulting in "hot spots" (overly bright areas) at the center and "dark areas" (brightness attenuation) at the edges. This non-uniformity leads to distortion of the grayscale values ​​on the surface of the scanned object, easily causing false detections (mistaking normal areas for defects) or missed detections (failing to identify low-contrast defects) in subsequent image processing, severely limiting the performance of high-speed, high-precision detection systems. Utility Model Content

[0004] This application provides a light source device for visual inspection, which can provide a linear light band with highly uniform brightness distribution, thereby improving the quality of image acquisition.

[0005] This application provides a light source device for visual inspection, including a housing, a first light source assembly, a beam splitter, and a dual-lens assembly. The housing has a receiving cavity and a detection port and a light exit port communicating with the receiving cavity. The first light source assembly is disposed within the receiving cavity. The beam splitter is disposed within the receiving cavity and located on the light emission path of the first light source assembly, for reflecting the light emitted by the first light source assembly to the light exit port and allowing the imaging light returning from the light exit port to be transmitted to the detection port. The dual-lens assembly is disposed between the first light source assembly and the beam splitter, and includes a first lens and a second lens arranged sequentially along the optical path direction, wherein the focal length of the first lens is smaller than the focal length of the second lens.

[0006] In some embodiments, the focal length of the first lens is 25mm ± 0.25mm, and the focal length of the second lens is 100mm ± 1mm.

[0007] In some embodiments, it also includes:

[0008] A first fixing plate and a second fixing plate are connected to the housing at intervals and located within the receiving cavity. An installation space is formed between the first fixing plate and the second fixing plate. The first light source assembly and the dual lens assembly are both installed within the installation space.

[0009] In some embodiments, a first fixing groove and a second fixing groove are provided at intervals on the surface of the first fixing plate facing the second fixing plate, and a third fixing groove and a fourth fixing groove are provided at intervals on the surface of the second fixing plate facing the first fixing plate.

[0010] The first lens has its two ends housed in the first fixing groove and the third fixing groove, respectively, and the second lens has its two ends housed in the second fixing groove and the fourth fixing groove, respectively.

[0011] In some embodiments, it also includes:

[0012] The second and third light source components are disposed within the receiving cavity and located below the first light source component. The second and third light source components are symmetrically arranged about the central axis of the detection port, and the light emission direction of the second and third light source components is set at an angle to the height direction.

[0013] In some embodiments, both the second light source assembly and the third light source assembly include a light source element and a diffusion film located in the light emission direction of the light source element;

[0014] The diffusion film is configured to provide a diffusion angle of 60°±0.2° in its length direction and a diffusion angle of 1°±0.2° in its width direction.

[0015] In some embodiments, at least one of the first light source assembly, the second light source assembly, and the third light source assembly includes a heat sink base and an LED circuit board, wherein the LED circuit board is attached to the heat sink base, and the heat sink base is provided with a heat dissipation channel.

[0016] The light source device for visual inspection also includes an interface connected to the heat dissipation channel for connecting to an external cooling device.

[0017] In some embodiments, both the second light source assembly and the third light source assembly include a heat sink base, an LED circuit board, a mounting base, a diffusion film, and a light-transmitting pressure plate. The mounting base is mounted on the heat sink base and together with the heat sink base defines a mounting groove. The LED circuit board is disposed in the mounting groove. The light-transmitting pressure plate is connected to the mounting base to press and fix the diffusion film onto the opening of the mounting groove.

[0018] In some embodiments, the angle formed by the light emission direction of the second light source component and the light emission direction of the third light source component with the height direction is not greater than 35° and not less than 20°.

[0019] In some embodiments, at least one of the second light source assembly and the third light source assembly is provided with an angle adjustment structure between itself and the housing;

[0020] The second light source component or the third light source component adjusts its illumination angle through the angle adjustment structure.

[0021] In the light source device based on the embodiments of this application, during operation, the light emitted by the first light source component first passes through the first lens. Because the first lens has a short focal length, it possesses strong converging ability, enabling preliminary collimation of light with a certain divergence angle, forming a beam with high collimation. This beam then enters the second lens. The second lens has a longer focal length, and its optical function is to further collimate and shape the initially collimated beam, expanding and projecting the beam over a larger area (such as a 155mm wide field of view) with a larger focal length. This optical design allows the first light source component to be relatively small in size, effectively reducing system power consumption and heat generation while achieving large-area uniform illumination, and contributing to a more compact device structure. Ultimately, a linear light band with highly uniform brightness distribution and no central hot spots or edge dark areas can be formed on the target detection plane, improving image acquisition quality. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0023] Figure 1 A first structural schematic diagram of a light source device for visual inspection provided in an embodiment of this application;

[0024] Figure 2 A second structural schematic diagram of a light source device for visual inspection provided in an embodiment of this application;

[0025] Figure 3 An exploded view of a light source device for visual inspection provided in an embodiment of this application;

[0026] Figure 4 A schematic diagram of the light path of a light source device for visual inspection provided in an embodiment of this application;

[0027] Figure 5 This is a third structural schematic diagram of a light source device for visual inspection provided in an embodiment of this application.

[0028] Explanation of icon numbers:

[0029] 1. Light source device; 10. Housing; 10a. Receiving cavity; 10b. Detection port; 10c. Light emission port; 11. Top plate; 12. Side plate; 13. End cap; 14. First fixing plate; 141. Installation space; 142. First fixing groove; 143. Second fixing groove; 15. Second fixing plate; 151. Third fixing groove; 152. Fourth fixing groove; 20. First light source assembly; 21. Heat dissipation base; 211. Heat dissipation channel; 22. LED circuit board; 3 0. Beam splitter; 40. Dual-lens assembly; 41. First lens; 42. Second lens; 50. Second light source assembly; 51. Mounting base; 52. Diffuser film; 53. Light-transmitting pressure plate; 54. Mounting slot; 60. Third light source assembly; 70. Interface; 80. Angle adjustment structure; 81. Mounting hole; 82. Assembly hole; 83. First adjustment hole; 84. Second adjustment hole; 90. Glass cover plate; XX, Length direction; YY, Width direction; ZZ, Height direction.

[0030] The realization of the purpose, functional features and advantages of this utility model will be further explained with reference to the accompanying drawings and embodiments. Detailed Implementation

[0031] To make the objectives, technical solutions and advantages of this utility model clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0032] Where the following description relates to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this invention. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this invention as detailed in the appended claims.

[0033] In the description of this utility model, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances. Furthermore, in the description of this utility model, unless otherwise stated, "multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0035] Please see Figures 1 to 3 This application provides a light source device 1 for visual inspection, which includes a housing 10, a first light source assembly 20, a beam splitter 30, and a dual-lens assembly 40. The housing 10 has a receiving cavity 10a, and the housing 10 is provided with a detection port 10b and a light output port 10c communicating with the receiving cavity 10a. The first light source assembly 20, the beam splitter 30, and the dual-lens assembly 40 are all disposed within the receiving cavity 10a.

[0036] The beam splitter 30 is tilted and positioned in the light emission path of the first light source assembly 20. It reflects the light emitted from the first light source assembly 20 to the light exit port 10c, while allowing the imaging light returning from the light exit port 10c to be transmitted to the detection port 10b. The detection port 10b is used for imaging and detection by an industrial camera. The reflected imaging light returns from the light exit port 10c and passes through the detection port 10b, where it is captured by the industrial camera. The beam splitter 30 has a reflective surface and a transmittant surface arranged opposite to each other. The reflective surface reflects light, and the transmittant surface transmits light.

[0037] The dual-lens assembly 40 is disposed between the first light source assembly 20 and the beam splitter 30, and includes a first lens 41 and a second lens 42 arranged coaxially along the optical path, wherein the focal length of the first lens 41 is smaller than the focal length of the second lens 42.

[0038] In some embodiments, the focal length of the first lens 41 is 25mm ± 0.25mm, and the focal length of the second lens 42 is 100mm ± 1mm. Both the first lens 41 and the second lens 42 can be Fresnel lenses to reduce the system thickness and weight while achieving the desired optical functions.

[0039] In some embodiments, the light source device 1 further includes a glass cover plate 90, which is connected to the housing and seals the detection port 10b. At least one optical surface of the glass cover plate 90 is coated with an antireflective film, which may be made of magnesium fluoride material, for example, to reduce interface reflection and improve light transmittance.

[0040] In the light source device 1 of this embodiment, during operation, the light emitted by the first light source component 20 first passes through the first lens 41. Because the first lens 41 has a short focal length, it possesses strong converging ability, enabling preliminary collimation of light with a certain divergence angle, forming a beam with high collimation. This beam then enters the second lens 42. The second lens 42 has a longer focal length, and its optical function is to further collimate and shape the initially collimated beam, expanding and projecting it over a larger area (such as a 155mm wide field of view) with a larger focal length. This optical design allows the first light source component 20 to be relatively small in size, effectively reducing system power consumption and heat generation while achieving large-area uniform illumination, and contributing to a more compact device structure. Ultimately, a linear light band with highly uniform brightness distribution and no central hot spots or edge dark areas can be formed on the target detection plane, significantly improving image acquisition quality.

[0041] Please refer to the following: Figure 1 as well as Figure 4 The light source device 1 of this embodiment is defined as having two mutually perpendicular directions: length XX, width YY, and height ZZ. The detection port 10b and the light output port 10c are aligned along the height direction ZZ, and the beam splitter 30 is installed at a 45° angle between the detection port 10b and the light output port 10c. The light output direction of the first light source assembly 20 is perpendicular to the imaging optical path between the detection port 10b and the light output port 10c. The light source device 1 is a linear light source structure, extending in the length direction XX. Both the first light source assembly 20 and the detection port 10b are rectangular, and their length direction XX is consistent with the length direction of the housing 10.

[0042] The housing 10 consists of a top plate 11, a side plate 12, and two end caps 13. The side plate 12 is connected to one side of the top plate 11 along the width direction YY, and the two end caps 13 are respectively sealed to the two ends of the top plate 11 and the side plate 12 along the length direction XX. The top plate 11, the side plate 12, and the end caps 13 together form a receiving cavity 10a. A detection port 10b is opened on the top plate 11, and a light outlet 10c is formed between the top plate 11 and the side plate 12.

[0043] Please see Figure 3 and Figure 4In some embodiments, the light source device 1 further includes a first fixing plate 14 and a second fixing plate 15 spaced apart in the height direction. The first fixing plate 14 is closer to the top plate 11, and the second fixing plate 15 is located below it, with the two being parallel to each other and spaced apart. The first fixing plate 14 is connected to the inner side of the top plate 11, and the two ends of the second fixing plate 15 are respectively connected to the inner walls of the two end caps 13. An installation space 141 is formed between the first fixing plate 14 and the second fixing plate 15, and the first light source assembly 20 and the dual lens assembly 40 are both installed in the installation space 141. This dual fixing plate structure provides a stable installation reference for the first light source assembly 20 and the dual lens assembly 40, ensuring the alignment accuracy between the optical axis of the first light source assembly 20 and the optical axis of the dual lens assembly 40, reducing assembly errors, and enhancing overall mechanical stability and vibration resistance.

[0044] Please see Figure 3 and Figure 4 In some embodiments, the surface of the first fixing plate 14 facing the second fixing plate 15 is provided with a first fixing groove 142 and a second fixing groove 143, and the surface of the second fixing plate 15 facing the first fixing plate 14 corresponds to a third fixing groove 151 and a fourth fixing groove 152. The two ends of the first lens 41 are respectively accommodated in the first fixing groove 142 and the third fixing groove 151, and the two ends of the second lens 42 are respectively accommodated in the second fixing groove 143 and the fourth fixing groove 152. This mounting structure ensures that the optical axes of the first lens 41 and the second lens 42 are aligned, improving beam quality.

[0045] Preferably, the connection between the first fixing plate 14 and the top plate 11, and the connection between the second fixing plate 15 and the end cap 13, are both achieved using M2 or M3 hex socket screws to ensure connection strength and detachability. Silicone or rubber damping pads are provided between each connection contact surface to absorb vibration and prevent direct contact and wear between metal surfaces.

[0046] The first fixing plate 14 and the second fixing plate 15 can be made of aluminum alloy, which is anodized after extrusion or precision machining to improve wear resistance and corrosion resistance; or engineering plastics (such as PEEK or PA66+GF30) can be used to integrally mold them through injection molding to reduce weight and cost. The fixing groove is precision milled by CNC or EDM to ensure dimensional accuracy and geometric tolerances.

[0047] Please refer to it again. Figure 3 and Figure 4In some embodiments, the light source device 1 further includes a second light source assembly 50 and a third light source assembly 60, both disposed within the receiving cavity 10a and located below the first light source assembly 20. The second light source assembly 50 and the third light source assembly 60 are symmetrically distributed about the central axis of the detection port 10b, wherein the central axis of the detection port 10b is collinear with the principal optical axis of the imaging light. The light emission directions of the second light source assembly 50 and the third light source assembly 60 are set at an angle to the height direction.

[0048] Please continue reading. Figure 3 and Figure 4 In some embodiments, both the second light source assembly 50 and the third light source assembly 60 include a light source element and a diffusion film 52 disposed in its light emission direction. The light source element may be an LED circuit board 22 with an array of LED beads. The diffusion film 52 may be a linear diffusion film 52 (LSD film), providing a diffusion angle of 60°±0.2° in its length direction and a diffusion angle of 1°±0.2° in its width direction, thereby forming a uniformly distributed linear light field in the irradiation area.

[0049] Please see Figure 3 and Figure 4 In some embodiments, at least one of the first light source assembly 20, the second light source assembly 50, and the third light source assembly 60 includes a heat sink 21 and an LED circuit board 22 mounted thereon. The heat sink 21 has a heat dissipation channel 211 inside, and the light source device 1 also has an interface 70 communicating with the heat dissipation channel 211 for connecting to external air-cooling or liquid-cooling equipment to improve heat dissipation efficiency. In a specific embodiment of this invention, the first light source assembly 20, the second light source assembly 50, and the third light source assembly 60 are all equipped with a heat sink 21 and an LED circuit board 22.

[0050] The first light source assembly 20, the second light source assembly 50, and the third light source assembly 60 are fixedly connected to the housing 10 via their respective heat dissipation bases 21. Specifically, the heat dissipation base 21 of the first light source assembly 20 is connected to the first fixing plate 14, the second fixing plate 15, and the end cap 13, while the heat dissipation bases 21 of the second light source assembly 50 and the third light source assembly 60 are fixed to the two end caps 13, respectively.

[0051] Please see Figure 3 and Figure 4In some embodiments, both the second light source assembly 50 and the third light source assembly 60 further include a mounting base 51 and a light-transmitting pressure plate 53. The mounting base 51 is fixed to the heat sink 21 and together with the heat sink 21, forms a mounting groove 54. The LED circuit board 22 is disposed within the mounting groove 54. The light-transmitting pressure plate 53 is connected to the mounting base 51 and presses and fixes the diffusion film 52 to the opening of the mounting groove 54. In this example, the light-transmitting pressure plate 53 can ensure the flatness and stability of the diffusion film 52, avoid optical distortion, and facilitate daily maintenance and replacement. The light-transmitting pressure plate 53 can be a light-diffusing plate. After the light emitted by the LED circuit board 22 passes through the light-diffusing plate, it can form a uniform surface light, improving the quality of the detected image.

[0052] Please see Figure 3 and Figure 4 In some embodiments, the angle formed by the light emission direction of the second light source component 50 and the light emission direction of the third light source component 60 with the height direction is not greater than 35° and not less than 20°. This angle range can provide low-angle illumination, which is suitable for dark-field imaging and can highlight the microscopic texture and contour features of the object surface.

[0053] Please see Figure 5 In some embodiments, at least one of the second light source assembly 50 and the third light source assembly 60 is provided with an angle adjustment structure 80 between itself and the housing 10. This angle adjustment structure 80 includes a mounting hole 81 and an assembly hole 82 on the light source assembly, and a first adjustment hole 83 and a second adjustment hole 84 correspondingly provided on the housing 10. The mounting hole 81 and the assembly hole 82 can be located on the heat dissipation base 21, while the first adjustment hole 83 and the second adjustment hole 84 are located on the end cover 13. The mounting hole 81 and the first adjustment hole 83 are connected by a first fastener, and the assembly hole 82 and the second adjustment hole 84 are connected by a second fastener. By changing the fixing position of the first fastener in the first adjustment hole 83, or changing the fixing position of the second fastener in the second adjustment hole 84, or simultaneously changing both the fixing positions of the first fastener in the first adjustment hole 83 and the second fastener in the second adjustment hole 84, the illumination angle of the second light source assembly 50 and / or the third light source assembly 60 can be adjusted flexibly according to different detection requirements, thereby improving the accuracy and adaptability of the detection.

[0054] Please see Figure 5In some structural configurations, the first adjustment hole 83 or the second adjustment hole 84 can be an arc-shaped hole. Arc-shaped holes provide a smoother and more continuous angle adjustment range, allowing operators to freely adjust the position of the fastener within a certain arc range, achieving precise adjustment of the light illumination angle. Alternatively, the first adjustment hole 83 or the second adjustment hole 84 can be a long, narrow hole. Long, narrow holes are simple in structure and easy to manufacture, providing angle adjustment within a certain length range. This is suitable for detection scenarios where the angle adjustment accuracy requirement is not particularly high, but rapid adjustment of the light direction is needed. Furthermore, the first adjustment hole 83 or the second adjustment hole 84 can also be multiple discrete holes distributed in a fan shape. By setting multiple holes at different positions, multiple fixed selection points for angle adjustment are provided. Operators can select appropriate holes for connection according to actual needs, achieving relatively precise angle positioning. The first and second fasteners can be in the form of screws, clips, etc.

[0055] In some embodiments, the first light source assembly 20, the second light source assembly 50, and the third light source assembly 60 are all independently controllable. This means that each light source module can be individually turned on, off, or have its brightness adjusted according to actual detection needs, without being interfered with by other light source modules. Furthermore, these light source modules support both constant-on and strobe modes. The constant-on mode is suitable for detection scenarios requiring continuous and stable illumination, while the strobe mode can capture clear images through rapidly flashing light in specific situations, such as the detection of high-speed moving objects, thereby improving detection accuracy and efficiency.

[0056] Based on the light source device 1 of this embodiment, the first light source component 20 provides bright-field illumination in a vertical or near-vertical direction to represent the overall color and uniformity characteristics of the object surface; the second light source component 50 and the third light source component 60, symmetrically arranged below it, can provide low-angle illumination (such as a default angle of 32°, with the ability to adjust downwards by 10°), suitable for dark-field imaging that highlights contours and textures. By controlling the above light sources independently or in combination, this device can realize multiple illumination modes such as bright-field, dark-field, and mixed-field without relying on external light source switching, significantly improving the integration of detection functions and ease of operation.

[0057] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the 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 element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this utility model. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0058] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A light source device (1) for visual inspection, characterized in that, include: The housing (10) has a receiving cavity (10a) and a detection port (10b) and a light output port (10c) communicating with the receiving cavity (10a). The first light source assembly (20) is disposed within the receiving cavity (10a); A beam splitter (30) is disposed within the receiving cavity (10a) and located on the light emission path of the first light source assembly (20). It reflects the light emitted by the first light source assembly (20) to the light exit port (10c) and allows the imaging light returning from the light exit port (10c) to be transmitted to the detection port (10b). A dual-lens assembly (40) is disposed between the first light source assembly (20) and the beam splitter (30), and includes a first lens (41) and a second lens (42) arranged coaxially along the optical path, wherein the focal length of the first lens (41) is smaller than the focal length of the second lens (42).

2. The light source device (1) for visual inspection as described in claim 1, characterized in that, The focal length of the first lens (41) is 25mm ± 0.25mm, and the focal length of the second lens (42) is 100mm ± 1mm; And / or, the first lens (41) and the second lens (42) are both Fresnel lenses.

3. The light source device (1) for visual inspection as described in claim 1, characterized in that, Also includes: The first fixing plate (14) and the second fixing plate (15) are connected to the housing (10) at intervals and located in the receiving cavity (10a). An installation space (141) is formed between the first fixing plate (14) and the second fixing plate (15). The first light source assembly (20) and the dual lens assembly (40) are both installed in the installation space (141).

4. The light source device (1) for visual inspection as described in claim 3, characterized in that, The first fixing plate (14) has a first fixing groove (142) and a second fixing groove (143) spaced apart on the surface facing the second fixing plate (15), and the second fixing plate (15) has a third fixing groove (151) and a fourth fixing groove (152) spaced apart on the surface facing the first fixing plate (14). The first lens (41) has its two ends housed in the first fixing groove (142) and the third fixing groove (151), respectively, and the second lens (42) has its two ends housed in the second fixing groove (143) and the fourth fixing groove (152), respectively.

5. A light source device (1) for visual inspection as described in any one of claims 1 to 4, characterized in that, Also includes: The second light source assembly (50) and the third light source assembly (60) are disposed in the receiving cavity (10a) and located below the first light source assembly (20). The second light source assembly (50) and the third light source assembly (60) are symmetrically arranged about the central axis of the detection port (10b), and the light emission direction of the second light source assembly (50) and the third light source assembly (60) are set at an angle to the height direction.

6. The light source device (1) for visual inspection as described in claim 5, characterized in that, The second light source assembly (50) and the third light source assembly (60) both include a light source element and a diffusion film (52) located in the light emission direction of the light source element. The diffusion film (52) is configured to provide a diffusion angle of 60°±0.2° in its length direction and a diffusion angle of 1°±0.2° in its width direction.

7. The light source device (1) for visual inspection as described in claim 6, characterized in that, At least one of the first light source assembly (20), the second light source assembly (50) and the third light source assembly (60) includes a heat sink base (21) and an LED circuit board (22), wherein the LED circuit board (22) is attached to the heat sink base (21), and a heat dissipation channel (211) is provided in the heat sink base (21). The light source device (1) also includes an interface (70) connected to the heat dissipation channel (211) for connecting to an external cooling device.

8. The light source device (1) for visual inspection as described in claim 6, characterized in that, The second light source assembly (50) and the third light source assembly (60) both include a heat sink base (21), an LED circuit board (22), a mounting base (51), a diffusion film (52), and a light-transmitting pressure plate (53). The mounting base (51) is mounted on the heat sink base (21) and together with the heat sink base (21) defines a mounting groove (54). The LED circuit board (22) is disposed in the mounting groove (54). The light-transmitting pressure plate (53) is connected to the mounting base (51) to press and fix the diffusion film (52) onto the opening of the mounting groove (54).

9. A light source device (1) for visual inspection as described in claim 5, characterized in that, The angle between the light emission direction of the second light source component (50) and the light emission direction of the third light source component (60) and the height direction is not greater than 35° and not less than 20°.

10. A light source device (1) for visual inspection as described in claim 9, characterized in that, An angle adjustment structure (80) is provided between the second light source assembly (50) and the third light source assembly (60) and the housing (10). The second light source assembly (50) or the third light source assembly (60) adjusts its illumination angle through the angle adjustment structure (80).

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