PCB soft board detection device based on conical hole air suction platform

Abstract

This invention relates to a PCB flexible board inspection device based on a conical hole suction platform, comprising a worktable, a backlight assembly, and a vision imaging assembly. The upper surface of the worktable is white and semi-transparent, while the lower surface is colorless and transparent. A vacuum cavity inside the worktable is connected to multiple suction holes. The backlight assembly includes a first light path, a second light path, and a third light path facing the worktable. At least one set of second light paths is provided on one side of the first light path, and at least one set of third light paths is provided on the other side of the first light path. The vision imaging assembly generates a visual image of the transparent / semi-transparent substrate area of ​​the PCB flexible board. The first light path illuminates the suction hole location, and the incident light from the second and third light paths, diffused by the white semi-transparent platform, illuminates the area surrounding the suction hole, resulting in similar brightness on the worktable and higher inspection accuracy.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of PCB detection, and particularly relates to a PCB soft board detection device based on a conical hole air suction platform. BACKGROUND

[0002] Printed circuit board is an important electronic component, is the support body of electronic components, and is the carrier of electrical interconnection of electronic components. Since it is made by electronic printing, it is called "printed" circuit board. In the 3C industry, the use amount of PCB is very large, the production process is complex, and the use requirement is high. A small action in the production process and the transportation process can cause damage to the PCB. The first step of the PCB into the whole machine assembly plant is to detect the appearance defects.

[0003] At present, in the PCB soft board detection, a transparent vacuum air suction platform and a backlight light source can be used to detect defects of the PCB soft board. At present, when the PCB soft board is detected on the market, the air suction hole of the transparent vacuum air suction platform will interfere with the detection of the PCB soft board when the backlight light source is used. There is a large brightness difference at the position of the air suction hole during the detection of the PCB soft board, which causes a high risk of defect detection false points and defect detection loss, and the detection precision is poor.

[0004] Therefore, it is necessary to provide a PCB soft board detection device based on a conical hole air suction platform to solve the above problems. SUMMARY

[0005] The present application relates to a PCB soft board detection device based on a conical hole air suction platform. The PCB soft board detection device based on the conical hole air suction platform is provided with a first light path, a second light path and a third light path on the side of the workbench away from the PCB soft board. The first light path can illuminate the air suction hole position, and the second light path and the third light path are obliquely irradiated. Since the workbench is white and translucent, the incident light can illuminate the area around the air suction hole under the scattering effect of the white translucent table surface, so that the brightness on the workbench is similar, the influence of the air suction hole can be eliminated, the imaging quality of the visual imaging assembly is improved, and the detection capability of the transparent / semi-transparent base material area defects of the PCB soft board is effectively improved. The detection precision is higher, and the problem that the detection precision is poor due to the large brightness difference at the position of the air suction hole during the detection of the PCB soft board in the prior art is solved.

[0006] To solve the above problems, the content of the present application is: a PCB soft board detection device based on a conical hole air suction platform, which comprises:

[0007] A workbench, a PCB soft board is placed on the workbench, the upper surface of the workbench is white and translucent, the lower surface of the workbench is colorless and transparent, and a plurality of air suction holes are arranged on the upper surface of the workbench and penetrate the upper surface of the workbench on both sides; a vacuum cavity is arranged in the workbench, and the plurality of air suction holes are in communication with the vacuum cavity; the vacuum cavity is connected with an air suction device to adsorb and fix the PCB soft board by air suction;

[0008] A backlight assembly is arranged on one side of the workbench, which includes a first light path opposite to the workbench, a second light path and a third light path obliquely arranged towards the workbench; at least one group of the second light paths is arranged on one side of the first light path, and at least one group of the third light paths is arranged on the other side of the first light path, and each of the second light paths, the third light paths and the first light path is arranged in cross.

[0009] A visual imaging assembly is arranged on the other side of the workbench, which is used to obtain the light of the first light path, the second light path and the third light path to generate a visual image of the transparent / semi-transparent substrate area of the PCB soft board.

[0010] Further, the air suction hole is arranged in a conical structure, and the end face size of the air suction hole close to one end of the PCB board is smaller than the end face size of the air suction hole close to one end of the backlight assembly.

[0011] Further, the extension lines between the two sides of the longitudinal section where the diameter of the air suction hole is located intersect to form a first included angle, the maximum field angle of the visual imaging assembly is a second included angle, and the angle of the first included angle is greater than the angle of the second included angle. When the backlight is incident to the hole wall of the conical air suction hole, the incident light is diffusely reflected on the hole wall surface. Since the angle of the first included angle of the conical air suction hole is greater than the angle of the second included angle of the visual imaging assembly, the diffusely reflected light cannot enter the visual imaging assembly for imaging.

[0012] Further, the central axis of each of the second light paths and the central axis of the corresponding third light paths form a third included angle. The angle of the third included angle is greater than the angle of the first included angle, and the angle of the third included angle is less than 180°, which ensures that enough scattered light enters the visual imaging assembly and improves the imaging quality.

[0013] Further, the intersection point between the central axis of each of the second light paths and the central axis of the corresponding third light paths is located on the side surface of the workbench facing the visual imaging assembly, which improves the uniformity of the surface brightness of the workbench.

[0014] Furthermore, the first optical path includes a first lamp source and a diffuser plate. The central axis of the first lamp source is arranged parallel to the central axis of the air intake, and the diffuser plate is located between the first lamp source and the worktable to improve the diffused light effect.

[0015] Furthermore, the second optical path includes a second lamp source and a focusing element. The second lamp source is arranged laterally so that the light emitted by the second lamp source obliquely illuminates the worktable. The focusing element is arranged between the second lamp source and the worktable, which can collimate or focus the second lamp source, thereby improving the brightness and utilization rate of the second lamp source.

[0016] Furthermore, the second optical path and the third optical path are configured with the same brightness, and the first optical path, the second optical path and the third optical path are all electrically connected to the main control system. The main control system is used to control the brightness of the first optical path, the second optical path and the third optical path, so as to achieve approximately consistent brightness in the entire area of ​​the air intake hole and the air intake platform.

[0017] Furthermore, the backlight assembly also includes light boxes spaced apart on the corresponding sides of the workbench and multiple cooling fans. The first light path, the second light path, and the third light path are spaced apart inside the light boxes. Multiple cooling fans are spaced apart along the length of each of the first light path, the second light path, and the third light path, making assembly and adjustment convenient and improving heat dissipation.

[0018] Furthermore, the upper surface of the workbench is made of white acrylic or white translucent resin material, and the lower surface of the workbench is made of colorless acrylic, colorless glass, or transparent resin material.

[0019] This invention, employing the aforementioned PCB flexible board inspection device based on a conical hole suction platform, offers the following advantages compared to existing technologies: The invention relates to a PCB flexible board inspection device based on a conical hole suction platform, comprising a worktable, a backlight assembly, and a vision imaging assembly. The PCB flexible board to be inspected is placed on the worktable. The upper surface of the worktable is white and semi-transparent, while the lower surface is colorless and transparent. Multiple suction holes are spaced apart on the upper surface of the worktable, penetrating both sides. A vacuum chamber is provided inside the worktable, and the suction holes communicate with this chamber. The vacuum chamber is connected to a suction device to suction and adhere the PCB flexible board. The backlight assembly is located on one side of the worktable and includes a first light path facing the worktable, a second light path tilted towards the worktable, and a third light path. At least one set of second light paths is provided on one side of the first light path, and at least one set of third light paths is provided on the other side of the first light path. Each second light path, each third light path, and the first light path are intersected. A visual imaging component is located on the other side of the worktable. This component acquires scattered light from the first, second, and third optical paths to generate a visual image of the transparent / semi-transparent substrate area of ​​the PCB flexible board. The first, second, and third optical paths are located on the side of the worktable facing away from the PCB flexible board. The first optical path illuminates the suction hole location, while the second and third optical paths illuminate at an angle. Because the upper surface of the worktable is white and semi-transparent, the incident light, under the scattering effect of the white semi-transparent surface, can illuminate the area around the suction hole, thus making the brightness on the worktable similar. This eliminates the influence of the suction hole, improves the imaging quality of the visual imaging component, and effectively enhances the detection capability of defects in the substrate area of ​​the PCB flexible board, resulting in higher detection accuracy. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments are briefly introduced below. The drawings described below are only the corresponding drawings of some embodiments of the present invention.

[0021] Figure 1 This is a side view of an embodiment of the workbench and backlight assembly of the PCB flexible board inspection device based on the conical hole suction platform of the present invention.

[0022] Figure 2 This is a schematic diagram of the worktable and backlight assembly of the PCB flexible board inspection device based on the conical hole suction platform of the present invention.

[0023] Figure 3 This is a schematic planar structure diagram of an embodiment of the PCB flexible board inspection device based on a conical hole suction platform of the present invention.

[0024] In the figure: 1. PCB flexible board inspection device based on conical hole suction platform; 2. Worktable; 21. Suction hole; a. First included angle; 22. Vacuum chamber; 31. First optical path; 311. First lamp source; 312. Diffuser plate; 32. Second optical path; 321. Second lamp source; 322. Focusing element; 33. Third optical path; 34. Lamp box; 35. Heat sink; 36. Cooling fan; c. Third included angle; 4. Visual imaging component; 41. Camera; 42. Lens; b. Second included angle. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] The directional terms mentioned in this invention, such as "up", "down", "front", "back", "left", "right", "inner", "outer", "side", "top" and "bottom", are only for reference to the orientation of the accompanying drawings. The directional terms used are for the purpose of explaining and understanding this invention, and are not intended to limit this invention.

[0027] In the diagram, units with similar structures are represented by the same labels.

[0028] Please refer to Figure 1 , Figure 2 , Figure 3In this embodiment, the PCB flexible board inspection device 1 based on a conical hole suction platform includes a worktable 2, a backlight assembly, and a vision imaging assembly 4. The PCB flexible board to be inspected is placed on the worktable 2. The upper surface of the worktable 2 is white and semi-transparent, while the lower surface is colorless and transparent. Multiple suction holes 21 are spaced apart on the upper surface of the worktable 2, penetrating both sides of the upper surface. A vacuum chamber 22 is provided inside the worktable 2, and the multiple suction holes 21 are connected to the vacuum chamber 22. The vacuum chamber 22 is connected to a suction device to suction and adhere the PCB flexible board. Specifically, the suction device can be a suction pump structure. The suction pump is located on the side of the worktable 2 and draws air from the vacuum chamber 22 and all the suction holes 21, thereby firmly adhering the flexible PCB board to the worktable 2 and improving the accuracy of the inspection. This suction device is not shown in the figure. A backlight assembly is disposed on one side of the worktable 2, comprising a first light path 31 facing the worktable 2, a second light path 32 tilted towards the worktable 2, and a third light path 33. At least one set of second light paths 32 is disposed on one side of the first light path 31, and at least one set of third light paths 33 is disposed on the other side of the first light path 31. Each second light path 32, each third light path 33, and the first light path 31 are arranged intersectingly. A vision imaging assembly 4 is disposed on the other side of the worktable 2. The vision imaging assembly 4 is used to acquire the scattered light from the first light path 31, the second light path 32, and the third light path 33 to generate a visual image of the transparent / semi-transparent substrate area of ​​the PCB flexible board.

[0029] In this setup, a flexible PCB is placed on a worktable 2. The first optical path 31, the second optical path 32, and the third optical path 33 are activated. The incident light from the first optical path 31 can directly exit through the suction hole 21, thus mapping the position of the suction hole 21. The incident light from the second optical path 32 and the third optical path 33 is diffused through the white semi-transparent surface of the upper surface of the worktable 2, illuminating the non-suction hole 21 area on the upper surface of the worktable 2. This makes the brightness of the suction hole 21 on the worktable 2, acquired by the visual imaging component 4, similar to the brightness of the non-suction hole 21 area, thereby improving image uniformity and eliminating the influence of uneven brightness between the suction hole 21 and its surrounding area. Consequently, the illumination intensity of each area of ​​the flexible PCB is the same. The light transmitted through the transparent / semi-transparent substrate area of ​​the flexible PCB enters the visual imaging component 4. The visual imaging component 4 generates an image based on the received light transmitted through the transparent / semi-transparent substrate area of ​​the flexible PCB. Based on the image, it can determine whether there are defects in the substrate portion of the flexible PCB, resulting in higher detection accuracy. The upper surface of the workbench 2 is a white semi-transparent structure. The upper surface of the workbench 2 can be made of white acrylic or white semi-transparent resin, with white acrylic being preferred. The lower surface of the workbench 2 is a colorless transparent structure. The lower surface of the workbench 2 can be made of colorless acrylic, colorless glass, or transparent resin, with colorless glass being preferred.

[0030] In this embodiment, the first optical path 31 includes a first light source 311 and a diffuser plate 312. The central axis of the first light source 311 is arranged parallel to the central axis of the air intake 21, and the diffuser plate 312 is located between the first light source 311 and the worktable 2 to improve the diffused light effect.

[0031] In this embodiment, the second optical path 32 includes a second light source 321 and a focusing element 322. The second light source 321 is arranged laterally so that the light emitted by the second light source 321 obliquely illuminates the worktable 2. The focusing element 322 is arranged between the second light source 321 and the worktable 2, which can collimate or focus the second light source 321, thereby improving the brightness and utilization rate of the second light source 321. The focusing element 322 can be a cylindrical lens, a light guide fiber, or other structures.

[0032] The third light path 33 has the same structure as the second light path 32, resulting in lower cost and easier control over the brightness of both light paths 32 and 33. The first light source 311 and the second light source 321 can be configured as LED light sources or halogen lamps, etc.

[0033] Preferably, the brightness of the second optical path 32 and the third optical path 33 is set to be the same, and the first optical path 31, the second optical path 32 and the third optical path 33 are all electrically connected to the main control system. The main control system is used to control the brightness of the first optical path 31, the second optical path 32 and the third optical path 33, which can achieve approximately consistent brightness in the entire platform area of ​​the air intake 21 and the worktable 2, with high control efficiency and stronger compatibility.

[0034] Among them, the brightness of the first optical path 31, the second optical path 32 and the third optical path 33 can be controlled independently.

[0035] When the first optical path 31 is activated alone, the light beam emitted from the first optical path 31 directly enters the visual imaging component 4 through the air intake 21 of the worktable 2, resulting in a brighter image at the air intake 21 location. However, at other locations on the worktable 2, the light beam emitted from the first optical path 31 first passes through the worktable 2 and is diffused; only a small portion of the diffused light enters the visual imaging component 4, resulting in a darker image in the non-air intake 21 area of ​​the worktable 2.

[0036] When the second optical path 32 and the third optical path 33 are activated individually, the light beams emitted from the second optical path 32 and the third optical path 33 are diffused through the stage 2. The diffused light enters the visual imaging component 4 for imaging, and the image in the non-suction hole 21 area of ​​the stage 2 is brighter. However, in the suction hole 21 area, since the light beam cannot enter the visual imaging component 4 for imaging through the suction hole 21, only a very small amount of diffused light enters, and the image in the suction hole 21 area is darker.

[0037] When the first light path 31, the second light path 32 and the third light path 33 are turned on at the same time, the brightness of the entire platform area of ​​the worktable 2 can be approximated by setting the brightness of each group of light sources.

[0038] In this embodiment, please refer to Figure 1 , Figure 2 The backlight assembly also includes light boxes 34 spaced apart on corresponding sides of the workbench 2, multiple heat sinks 35, and multiple cooling fans 36. The first light path 31, second light path 32, and third light path 33 are spaced apart within the light box 34. The backplates of the light sources in the first light path 31, second light path 32, and third light path 33 are all equipped with heat sinks 35. Multiple cooling fans 36 are spaced apart along the length of each of the first light path 31, second light path 32, and third light path 33, facilitating assembly and adjustment and improving heat dissipation. The heat dissipation methods for the first light path 31, second light path 32, and third light path 33 include, but are not limited to, cooling fan cooling, such as water cooling.

[0039] Since the maximum field of view of the visual imaging component 4 is determined by the machine precision, camera 41, and lens 42, the tilt of the second optical path 32 and the third optical path 33 can be adjusted according to the actual maximum field of view of the visual imaging component 4, resulting in stronger compatibility. When the maximum field of view increases, the tilt of the second optical path 32 and the third optical path 33 can be reduced, thereby adjusting the illumination intensity of the area outside the air intake 21.

[0040] In this embodiment, please refer to Figure 2 , Figure 3 The air intake 21 is designed with a tapered structure, and the end face size of the air intake 21 near the PCB board is smaller than the end face size of the air intake 21 near the backlight assembly.

[0041] Preferably, the extended lines between the two sides of the longitudinal section containing the diameter of the air intake 21 intersect to form a first included angle α, and the maximum field of view of the visual imaging component 4 is a second included angle β, where the angle of the first included angle α is greater than the angle of the second included angle β. When the light from the first light path 31, the second light path 32, and the third light path 33 is incident on the wall of the conical air intake 21, the incident light undergoes diffuse reflection on the surface of the wall. Since the angle of the first included angle α of the conical air intake 21 is greater than the angle of the second included angle β of the visual imaging component 4, the diffusely reflected light cannot enter the visual imaging component 4 to form an image. Only the light emitted from the end face of the air intake 21 by the first light path 31 can enter the visual imaging component 4 to form an image, thereby avoiding excessive brightness in the area of ​​the air intake 21 and facilitating the balance of illumination on the worktable 2.

[0042] Preferably, a third angle c is formed between the central axis of each second optical path 32 and the central axis of the corresponding third optical path 33. The angle c is greater than the first angle a and less than 180°, ensuring that enough scattered light enters the visual imaging component 4 to improve image quality. However, if the third angle c is too large, only a small portion of the scattered light from the second optical path 32 and the third optical path 33 will enter the visual imaging component 4 after passing through the worktable 2. This results in a darker brightness on the remaining surface of the worktable 2 (excluding the air intake 21), which is insufficient to compensate for the color difference between the air intake 21 and the worktable surface caused by the first optical path 31. The user can adjust the third angle c within the above range according to the brightness requirements. For example, if the worktable 2 is dark, the angle can be decreased; if the worktable 2 is bright, the angle can be increased.

[0043] Specifically, each second optical path 32 is correspondingly provided with a third optical path 33, and they are symmetrically arranged along the first optical path 31, making the scattered light distribution more uniform and eliminating the color difference between the position of the air intake 21 and the other positions on the worktable 2. In this embodiment, the second optical path 32 and the third optical path 33 are each set as a pair, and the included angle between the second optical path 32 and the third optical path 33 is the third included angle c.

[0044] The intersection point between the central axis of each second optical path 32 and the central axis of the corresponding third optical path 33 is located on the side surface of the worktable 2 facing the vision imaging component 4, thereby improving the uniformity of the surface brightness of the worktable 2.

[0045] Before use, the PCB flexible board inspection device 1 based on the conical hole suction platform adjusts the third angle c between the second optical path 32 and the third optical path 33 based on the maximum field of view of the visual imaging component 4 and the first included angle α of the conical suction hole 21. This ensures that more scattered light can enter the visual imaging component 4, improving the brightness of the non-suction hole 21 area of ​​the worktable 2 and the brightness uniformity between the suction hole 21 area and the non-suction hole 21 area. During the inspection process, the first optical path 31, the second optical path 32, and the third optical path 33 are activated simultaneously, with the brightness of the second optical path 32 and the third optical path 33 set to the same level. The light from the first optical path 31 enters the visual imaging component 4 through the diffuser plate 312 and the suction hole 21, while the light from the second optical path 32 and the third optical path 33 enters the visual imaging component 4 after being scattered by the white semi-transparent worktable 2. Because the suction hole 21 on the worktable 2 is designed with a conical structure, the diffuse reflected light from the second optical path 32 and the third optical path 33 can be reduced from directly entering the vision imaging component 4 through the suction hole 21. This also prevents the enhancement of scattered light from the first optical path 31, ensuring that the brightness of the area around the suction hole 21 is not as high as the brightness of the area around the suction hole 21 on the worktable surface. This guarantees that the illumination of the entire surface of the worktable 2 facing the PCB flexible board is consistent and uniform. The vision imaging component 4 uses a camera 41 with a corresponding lens 42 to acquire the image of the PCB flexible board substrate generated by the scattered light from the worktable 2. Therefore, the main control system uses this image to identify various defects in the substrate of the PCB flexible board, improving the accuracy and efficiency of the detection.

[0046] In this embodiment, the present invention relates to a PCB flexible board inspection device based on a conical hole suction platform, comprising a worktable, a backlight assembly, and a vision imaging assembly. The PCB flexible board to be inspected is placed on the worktable. The upper surface of the worktable is white and semi-transparent, while the lower surface is colorless and transparent. Multiple suction holes are spaced apart on the upper surface of the worktable, penetrating both sides of the upper surface. A vacuum chamber is provided inside the worktable, and the multiple suction holes are connected to the vacuum chamber. The vacuum chamber is connected to a suction device to suction and fix the PCB flexible board. The backlight assembly is disposed on one side of the worktable and includes a first light path facing the worktable, a second light path tilted towards the worktable, and a third light path. At least one set of second light paths is provided on one side of the first light path, and at least one set of third light paths is provided on the other side of the first light path. Each second light path, each third light path, and the first light path are arranged intersectingly. A visual imaging component is located on the other side of the worktable. This component acquires scattered light from the first, second, and third optical paths to generate a visual image of the transparent / semi-transparent substrate area of ​​the PCB flexible board. The first, second, and third optical paths are located on the side of the worktable facing away from the PCB flexible board. The first optical path illuminates the suction hole location, while the second and third optical paths illuminate at an angle. Because the upper surface of the worktable is white and semi-transparent, the incident light, under the scattering effect of the white semi-transparent surface, can illuminate the area around the suction hole, thus making the brightness on the worktable similar. This eliminates the influence of the suction hole, improves the imaging quality of the visual imaging component, and effectively enhances the detection capability of defects in the substrate area of ​​the PCB flexible board, resulting in higher detection accuracy.

[0047] In summary, although the present invention has been disclosed above with reference to preferred embodiments, the above preferred embodiments are not intended to limit the present invention. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope defined in the claims.

Claims

1. A PCB flexible board inspection device based on a conical hole suction platform, characterized in that, include: A workbench is provided, on which a PCB flexible board is placed. The upper surface of the workbench is white and semi-transparent, while the lower surface is colorless and transparent. The upper surface of the workbench is provided with multiple suction holes that penetrate both sides of the upper surface. A vacuum chamber is provided inside the workbench, and the multiple suction holes are connected to the vacuum chamber. The vacuum chamber is connected to a suction device to suction and fix the PCB flexible board. A backlight assembly, disposed on one side of the worktable, includes a first optical path facing the worktable, a second optical path obliquely directed toward the worktable, and a third optical path; at least one set of the second optical path is disposed on one side of the first optical path, and at least one set of the third optical path is disposed on the other side of the first optical path; each second optical path, each third optical path, and the first optical path are intersected; the second optical path and the third optical path are symmetrically arranged relative to the first optical path; and... A visual imaging component is disposed on the other side of the worktable. The visual imaging component is used to acquire the scattered light from the first optical path, the second optical path and the third optical path to generate a visual image of the transparent / semi-transparent substrate area of ​​the PCB flexible board. The air intake hole is configured as a tapered structure, and the end face size of the air intake hole near the PCB flexible board is smaller than the end face size of the air intake hole near the backlight assembly. The extended lines between the two sides of the longitudinal section containing the diameter of the air intake hole intersect to form a first included angle, and a third included angle is formed between the central axis of each second optical path and the central axis of the corresponding third optical path; the angle of the third included angle is greater than the angle of the first included angle, and the angle of the third included angle is less than 180°; The first, second, and third optical paths are activated. The incident light from the first optical path can be directly emitted through the air intake hole, thus mapping the position of the air intake hole. The incident light from the second and third optical paths is diffused through the white semi-transparent table surface on the upper surface of the worktable, illuminating the non-air intake hole area on the upper surface of the worktable.

2. The PCB flexible board inspection device based on a conical hole suction platform according to claim 1, characterized in that, The maximum field of view of the visual imaging component is the second included angle, and the angle of the first included angle is greater than the angle of the second included angle.

3. The PCB flexible board inspection device based on a conical hole suction platform according to claim 1, characterized in that, The intersection point between the central axis of each of the second optical paths and the central axis of the corresponding third optical path is located on the side surface of the worktable facing the visual imaging component.

4. The PCB flexible board inspection device based on a conical hole suction platform according to claim 1, characterized in that, The first optical path includes a first lamp source and a diffuser plate; the central axis of the first lamp source is arranged parallel to the central axis of the air intake hole, and the diffuser plate is located between the first lamp source and the worktable.

5. The PCB flexible board inspection device based on a conical hole suction platform according to claim 1, characterized in that, The second optical path includes a second lamp source and a focusing element. The second lamp source is arranged laterally so that the light emitted by the second lamp source obliquely illuminates the worktable. The focusing element is arranged between the second lamp source and the worktable.

6. The PCB flexible board inspection device based on a conical hole suction platform according to claim 1, characterized in that, The second optical path and the third optical path have the same brightness setting, and the first optical path, the second optical path and the third optical path are all electrically connected to the main control system. The main control system is used to control the brightness of the first optical path, the second optical path and the third optical path.

7. The PCB flexible board inspection device based on a conical hole suction platform according to claim 1, characterized in that, The backlight assembly also includes a light box and multiple cooling fans spaced apart on the corresponding side of the workbench. The first light path, the second light path, and the third light path are spaced apart inside the light box, and multiple cooling fans are spaced apart along the length of each of the first light path, the second light path, and the third light path.

8. The PCB flexible board inspection device based on a conical hole suction platform according to claim 1, characterized in that, The upper surface of the workbench is made of white acrylic or white translucent resin material, and the lower surface of the workbench is made of colorless acrylic, colorless glass or transparent resin material.

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