Light source detection device

Abstract

The application discloses a light source detection device for detecting the appearance of a PCB, comprising a box, a coaxial light source assembly, a semi-transparent semi-reflective mirror and a light absorbing member. The box has a receiving cavity, a detection opening and a light outlet opening which are connected to the receiving cavity. The coaxial light source assembly is arranged in the receiving cavity. The semi-transparent semi-reflective mirror is arranged in the receiving cavity and located on the light emitting path of the coaxial light source assembly. The semi-transparent semi-reflective mirror reflects the light emitted by the coaxial light source assembly to the light outlet opening and allows the imaging light returned from the light outlet opening to be transmitted to the detection opening. The light absorbing member is arranged in the receiving cavity and located on the side of the semi-transparent semi-reflective mirror away from the coaxial light source assembly. The light absorbing member absorbs the stray light transmitted through the semi-transparent semi-reflective mirror. The light transmittance of the semi-transparent semi-reflective mirror is greater than its reflectivity.

Description

Technical Field

[0001] This utility model relates to the technical field of light source detection devices, and in particular to a light source detection device. Background Technology

[0002] In the manufacturing process of PCBs (Printed Circuit Boards), automated visual inspection of their appearance is a crucial step in ensuring product quality. Currently, light source inspection devices based on the coaxial illumination principle are widely used in the market. These devices consist of a housing containing a coaxial light source and a semi-reflective mirror. The light emitted by the coaxial light source is reflected by the semi-reflective mirror and then shines perpendicularly onto the surface of the PCB board. The light reflected from the PCB board then passes through the semi-reflective mirror again and is received by a camera above, thus forming an image.

[0003] However, most existing transflective mirrors use a 50:50 (transmittance:reflectance) beam splitting ratio. This results in only 50% of the light used for illumination being utilized, while another 50% of the imaging light returning from the object is lost when it passes through the mirror a second time, ultimately leading to a very weak effective light signal reaching the camera. Furthermore, the portion of light emitted from the light source that passes directly through the transflective mirror (accounting for 50% in a 50:50 beam splitter) becomes the main source of noise. This strong light is reflected multiple times by the inner wall of the enclosed chamber, forming non-uniform background stray light. This stray light, as background noise, is superimposed on the effective image signal, causing a "hazy" appearance, halo effect, and even artifacts and ghosting, reducing the accuracy and reliability of the detection.

[0004] Therefore, a light source detection device is needed to solve the aforementioned problems of clarity and noise, and improve the accuracy and reliability of PCB appearance inspection. Utility Model Content

[0005] This application provides a light source detection device that can improve the accuracy and reliability of PCB appearance inspection.

[0006] This application provides a light source detection device for detecting the appearance of a PCB board, including a housing, a coaxial light source assembly, a semi-transparent mirror, and a light-absorbing component. The housing has a receiving cavity and a light-emitting port and a detection port communicating with the receiving cavity. The coaxial light source assembly is disposed within the receiving cavity. The semi-transparent mirror is disposed within the receiving cavity and located on the light emission path of the coaxial light source assembly, used to reflect the light emitted by the coaxial light source assembly to the light-emitting port, and to allow the imaging light returning from the light-emitting port to be transmitted to the detection port. The light-absorbing component is disposed within the receiving cavity and located on the side of the semi-transparent mirror opposite to the coaxial light source assembly, used to absorb stray light transmitted through the semi-transparent mirror. The transmittance of the semi-transparent mirror is greater than its reflectance.

[0007] In some embodiments, the ratio of transmittance to reflectance of the semi-transparent mirror is (6:4) to (8:2).

[0008] In some embodiments, the ratio of transmittance to reflectance of the semi-transparent mirror is 7:3.

[0009] In some embodiments, the thickness of the semi-transparent and semi-reflective mirror is not less than 0.5 mm and not more than 1 mm.

[0010] In some embodiments, a fixing plate is further included, which is disposed in the receiving cavity and located on the side of the semi-transparent mirror away from the coaxial light source assembly. The fixing plate has a fixing groove on the side facing the semi-transparent mirror, and at least a portion of the semi-transparent mirror is engaged in the fixing groove.

[0011] The light-absorbing element is mounted on the fixed plate.

[0012] In some embodiments, the light-absorbing element is a light-absorbing fabric.

[0013] In some embodiments, a first reinforcing light source assembly is further included, wherein the first reinforcing light source assembly is disposed within the receiving cavity and located below the coaxial light source assembly;

[0014] The angle between the emitted light direction of the first reinforcing light source component and the vertical direction is not greater than 30° and not less than 5°.

[0015] In some embodiments, the light source further includes two second supplementary light source components, which are disposed below the first supplementary light source component and located on opposite sides of the central axis of the light outlet.

[0016] The second reinforcing light source component is configured to emit light of at least two different wavelengths, including visible light and invisible light.

[0017] In some embodiments, the coaxial light source assembly, the first supplementary light source assembly, and the second supplementary light source assembly all include light-emitting elements, and the emission angle of the light-emitting elements is not greater than 60°.

[0018] In some embodiments, at least one of the first and second reinforcing light source components is provided with an angle adjustment structure between itself and the housing;

[0019] The angle adjustment structure includes mounting holes and assembly holes provided on the reinforcing light source assembly, as well as fixing holes and adjustment holes provided on the housing.

[0020] The mounting hole and the fixing hole are fixedly connected by fasteners, and the assembly hole and the adjustment hole are connected by fasteners. By changing the connection position of the fastener in the adjustment hole, the illumination angle of the reinforcing light source assembly can be adjusted.

[0021] The light source detection device based on the embodiments of this application effectively solves the technical problems of poor image signal-to-noise ratio and low contrast caused by low optical path efficiency and stray light interference in traditional coaxial light source devices by adopting a semi-transparent mirror with a transmittance greater than its reflectance and a light-absorbing component. The specific working process is as follows: The light emitted by the coaxial light source component shines on the semi-transparent mirror. Since the transmittance of the semi-transparent mirror (e.g., 70%) is higher than its reflectance (e.g., 30%), most of the light will pass directly through and be absorbed by the light-absorbing component behind it. However, a certain intensity (30%) of the light is still reflected and shines perpendicularly onto the PCB board surface. When the imaging light carrying surface information reflected by the PCB board passes through the semi-transparent mirror again, due to its high transmittance characteristics, most (70%) of the effective signal light can penetrate the mirror and be captured by the industrial camera above, significantly improving the efficiency of the imaging optical path. At the same time, the light-absorbing component can completely absorb the directly transmitted strong light, eliminating the possibility of it repeatedly reflecting and forming background stray light in the chamber. This embodiment achieves the dual effects of enhancing imaging signals and suppressing background noise while ensuring illumination brightness, thereby obtaining high-quality images with clean backgrounds and clear details, which greatly improves the detection accuracy and reliability of PCB appearance defects (such as scratches, contamination, poor soldering, etc.). 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 This is a schematic diagram of the structure of a light source detection device provided in an embodiment of this application;

[0024] Figure 2 This is an exploded view of a light source detection device provided in an embodiment of this application;

[0025] Figure 3 This is a cross-sectional schematic diagram of a light source detection device provided in an embodiment of this application;

[0026] Figure 4 This is a schematic diagram of the light path of a light source detection device provided in an embodiment of this application;

[0027] Figure 5 This is a schematic diagram of an angle adjustment structure provided in an embodiment of this application.

[0028] Explanation of icon numbers:

[0029] 1. Light source detection device; 10. Housing; 10a. Receiving cavity; 10b. Detection port; 10c. Light output port; 11. Top plate; 12. Bottom plate; 13. Side plate; 14. Cover plate; 15. Fixing plate; 151. Fixing groove; 20. Coaxial light source assembly; 30. Semi-transparent mirror; 40. Light absorber; 50. First reinforcing light source assembly; 60. Second reinforcing light source assembly; 61. First supplementary light module; 62. Second supplementary light module; 70. Diffuser assembly; 71. Diffuser; 80. Angle adjustment structure; 81. Mounting hole; 82. Assembly hole; 83. Fixing hole; 84. Adjustment hole; 91. Signal interface; 92. Cooling fan.

[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 detection device 1 for detecting the appearance of a PCB board. The device includes a housing 10, a coaxial light source assembly 20, a semi-transparent mirror 30, and a light-absorbing component 40. A receiving cavity 10a is formed inside the housing 10, within which the coaxial light source assembly 20, the semi-transparent mirror 30, and the light-absorbing component 40 are all disposed. The housing 10 has a detection port 10b and a light-emitting port 10c communicating with the receiving cavity 10a. The semi-transparent mirror 30 is located in the light emission path of the coaxial light source assembly 20, reflecting the light emitted by the coaxial light source assembly 20 to the light-emitting port 10c, while allowing the imaging light returning from the light-emitting port 10c to be transmitted to the detection port 10b. The detection port 10b is used for imaging detection by an industrial camera (not shown). The reflected imaging light returns from the light-emitting port 10c and passes through the detection port 10b, where it is captured by the industrial camera. The light-absorbing element 40 is disposed on the side of the semi-transparent mirror 30 facing away from the coaxial light source assembly 20. Its function is to absorb stray light transmitted through the semi-transparent mirror 30, thereby reducing the interference of stray light on imaging. It should be noted that in this embodiment, the transmittance of the semi-transparent mirror 30 is greater than its reflectance.

[0036] The light source detection device 1 based on the embodiments of this application solves the technical problems of poor image signal-to-noise ratio and low contrast caused by low optical path efficiency and stray light interference in traditional coaxial light source devices by adopting a semi-transparent mirror 30 with a transmittance greater than reflectance and a light absorber 40. The specific working process is as follows: The light emitted by the coaxial light source assembly 20 shines on the semi-transparent mirror 30. Since the transmittance (e.g., 70%) of the semi-transparent mirror 30 is higher than the reflectance (e.g., 30%), most of the light will pass directly through and be absorbed by the light absorber 40 behind it. However, a certain intensity (30%) of the light is still reflected and shines vertically onto the surface of the PCB board. When the imaging light carrying surface information reflected by the PCB board passes through the semi-transparent mirror 30 again, due to its high transmittance characteristics, most (70%) of the effective signal light can penetrate the mirror and be captured by the industrial camera above, which significantly improves the efficiency of the imaging optical path. At the same time, the light absorber 40 can absorb the directly transmitted strong light and eliminate the possibility of it repeatedly reflecting and forming background stray light in the housing 10. This embodiment achieves both enhanced imaging signal and suppressed background noise while ensuring illumination brightness, thereby obtaining high-quality images with clean backgrounds and clear details, which greatly improves the detection accuracy and reliability of PCB appearance defects (such as scratches, contamination, poor soldering, etc.).

[0037] In some embodiments, the ratio of transmittance to reflectance of the semi-transparent mirror 30 ranges from (6:4) to (8:2). This configuration allows for high transmission efficiency in the imaging optical path while preserving sufficient light energy for the illumination optical path. If the ratio of transmittance to reflectance of the semi-transparent mirror 30 is greater than 8:2, it can easily lead to insufficient light reflected onto the PCB board, thus affecting the imaging effect.

[0038] Optionally, the transmittance to reflectance ratio of the semi-transparent mirror 30 is set to 7:3. After conducting multiple experiments on the transmittance ratio of the mirror, a pattern was observed: the higher the transmittance ratio, the more significant the defects. For example, this is particularly pronounced when the transmittance to reflectance ratio reaches 9:1. However, excessively high transmittance leads to excessively low reflectance, resulting in a significant increase in noise. In contrast, when the transmittance to reflectance ratio of the semi-transparent mirror 30 is 7:3, the imaging effect can be maintained at a relatively stable level.

[0039] In some embodiments, the thickness of the semi-transparent mirror 30 is not less than 0.5 mm and not more than 1 mm, such as 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, etc. Controlling the thickness of the semi-transparent mirror 30 to be not less than 0.5 mm in this embodiment ensures that the lens has sufficient structural strength and rigidity, making it less prone to breakage or deformation during installation, use, and transportation. Controlling its thickness to be not more than 1 mm shortens the propagation path of light in the glass medium, reduces geometric aberrations such as spherical aberration caused by the lens thickness, improves image resolution and edge sharpness, and makes details clearer and more discernible.

[0040] Please see Figure 2 and Figure 3 In some embodiments, the housing 10 is composed of a top plate 11, a bottom plate 12, two side plates 13, and two cover plates 14. The top plate 11 and the bottom plate 12 are arranged parallel in the vertical direction, and the two side plates 13 and the two cover plates 14 are installed between the top plate 11 and the bottom plate 12. These plates enclose each other to form a receiving cavity 10a.

[0041] Please see Figure 2 and Figure 3 The top plate 11 has a detection port 10b communicating with the receiving cavity 10a. The bottom plate 12 has a light emission port 10c communicating with the receiving cavity 10a. Optionally, the top plate 11 may be composed of two sub-top plates with a gap between them, forming the detection port 10b; the bottom plate 12 may be composed of two sub-bottom plates with a gap between them, forming the light emission port 10c. In other embodiments, the top plate 11 and the bottom plate 12 may each be a single piece, with the detection port 10b and the light emission port 10c formed by machining openings on the plates.

[0042] Please see Figure 2 and Figure 3 In some embodiments, the coaxial light source assembly 20 includes a base, a light-emitting element, and a light-diffusing plate. The base consists of a heat sink and two mounting plates. The light-emitting element includes a circuit board and LEDs mounted on the circuit board. The light-emitting element is mounted on the heat sink, and the two mounting plates are mounted on the heat sink and located on opposite sides of the light-emitting element. A fixing groove 151 is provided on the inner side of the mounting plate, and the light-diffusing plate is fixed in the direction of the light emitted by the light-emitting element through the fixing groove 151. After the light emitted by the light-emitting element passes through the light-diffusing plate, it can form a uniform surface light. This uniform surface light can provide stable and uniform illumination for the PCB board, avoiding differences in brightness in the detection image due to uneven light, thereby improving the quality of the detection image and making the detection results more accurate and reliable.

[0043] Please see Figure 2 and Figure 3In some embodiments, the housing 10 further includes a fixing plate 15, which is connected to the top plate 11 and is disposed within the receiving cavity 10a, located on the side of the semi-transparent mirror 30 facing away from the coaxial light source assembly 20. A fixing groove 151 is provided on the side of the fixing plate 15 facing the semi-transparent mirror 30, and at least a portion of the semi-transparent mirror 30 is engaged within this fixing groove 151. This installation method ensures the stability of the semi-transparent mirror 30's position, reduces light reflection and transmission deviations caused by factors such as vibration, and guarantees the accuracy of the optical path during the detection process. A light-absorbing element 40 is disposed on the fixing plate 15. In some embodiments, the light-absorbing element 40 is a light-absorbing cloth. The light-absorbing cloth can be black velvet, which has good light absorption performance and can effectively absorb stray light transmitted through the semi-transparent mirror 30, reducing stray light interference with imaging, further improving the signal-to-noise ratio and contrast of the image, making the detected image clearer, and facilitating accurate identification of appearance defects on the PCB board. In other embodiments, the light-absorbing element 40 may also be in the form of light-absorbing foam, carbon fiber light-absorbing plate, vanadium oxide light-absorbing film, etc. This embodiment does not limit the specific form of the light-absorbing element 40.

[0044] Please see Figure 3 and Figure 4 In some embodiments, the light source detection device 1 further includes a first reinforcing light source assembly 50. This first reinforcing light source assembly 50 is disposed within the receiving cavity 10a and located below the coaxial light source assembly 20. The angle formed between its emitted light direction and the vertical direction is not less than 5° and not greater than 30°. In this example, the first reinforcing light source assembly 50 can enhance the light intensity, and the light emitted within this specific angle range provides better detection of the hole walls of PCB board holes, resulting in clearer hole wall images.

[0045] Please see Figure 3 and Figure 4 In some embodiments, the light source detection device 1 further includes two second supplementary light source components 60. These two second supplementary light source components 60 are mounted below the first supplementary light source component 50 and are located on opposite sides of the central axis of the light outlet 10c. The second supplementary light source components 60 are designed to emit light of at least two different wavelengths, including at least visible light and invisible light. The visible light can be white light, and the invisible light can be infrared light.

[0046] In this example, because white light contains multiple wavelengths, it can comprehensively illuminate the ink surface, making defects such as uneven ink color and peeling more clearly visible due to differences in light reflection, facilitating accurate identification by the detection system. White light also effectively enhances the overall brightness of the detection light, improving the accuracy and reliability of the detection. Infrared light can help illuminate hidden scratches. Infrared light has unique penetrating and reflecting properties; even if scratches are small or obscured by other materials, infrared light can penetrate obstacles and reflect back to the detection system. By analyzing the reflected infrared light signals, the detection system can accurately locate hidden scratches, achieving effective detection of such concealed defects on PCB boards. The combination of white and infrared light enables efficient and accurate detection of different types of defects on PCB boards, greatly improving the quality and efficiency of the detection.

[0047] Please see Figure 3 and Figure 4 In some embodiments, both second supplementary light source assemblies 60 adopt a modular design, including a first supplementary light module 61 and a second supplementary light module 62. Specifically, the first supplementary light module 61 is stably mounted on the base plate 12, and the second supplementary light module 62 is mounted at an angle above the first supplementary light module 61. The light emission directions of both the first supplementary light module 61 and the second supplementary light module 62 are precisely oriented towards the light outlet 10c to ensure that the light can be concentrated and effectively projected onto the detection area.

[0048] Please see Figure 3 and Figure 4 The light source detection device 1 includes a diffuser plate assembly 70, which comprises two diffuser plates 71 disposed within the receiving cavity 10a. These two diffuser plates 71 are located on opposite sides of the central axis of the light outlet 10c, and are set at a certain angle to the horizontal direction. Their function is to diffuse the light, making the light more evenly illuminate the PCB board, avoiding localized over-brightness or under-brightness, thereby improving the imaging effect.

[0049] The reinforcing light source assembly provides omnidirectional, multi-angle enhanced light. When used in conjunction with the diffuser assembly 70, the diffuser assembly 70 can uniformly scatter the light, greatly improving the overall brightness of the light source and thus enhancing the brightness of the light reflected from subsequent materials. This not only helps improve the quality of subsequent appearance image acquisition, making the images clearer and more accurate, but also effectively improves the accuracy of appearance inspection and reduces inspection errors.

[0050] The second supplementary lighting modules 62 in the two second supplementary light source assemblies 60 can both emit visible and invisible light. The second supplementary lighting modules 62 can flexibly adjust the light type according to different detection needs. For example, visible light is used when detecting surface defects, and invisible light is used when detecting hidden defects. The first supplementary lighting module 61 can only include visible light and is mainly used to provide basic ambient lighting to ensure that there is enough light in the detection area for preliminary observation and detection.

[0051] To further explain, since the transmittance of the semi-transparent mirror 30 in this embodiment is greater than its reflectance, the light reflected back after the first reinforcing light source component 50, the second reinforcing light source component 60, and the third reinforcing light source component illuminate the PCB board can pass through the semi-transparent mirror 30 to a greater extent, thereby making the image clearer and higher definition.

[0052] Please see Figure 3 and Figure 4 The first and second supplementary light source components 50 and 60 can be configured similarly to the coaxial light source component 20, meaning they can each include a base, light-emitting elements, and a light-diffusing plate. The emission angle of the light-emitting elements in the coaxial light source component 20, the first supplementary light source component 50, and the second supplementary light source component 60 is no greater than 60°. This allows for more concentrated light projection onto the target area, reducing ineffective light scattering and improving light utilization and illumination brightness in the target area.

[0053] The coaxial light source assembly 20, the first reinforcing light source assembly 50, the second reinforcing light source assembly 60, and the third reinforcing light source assembly can be fixed to the two cover plates 14 with screws. Specifically, holes can be drilled in the base (heat sink) for installation and fixation. Please refer to [link to relevant documentation]. Figure 5 In some embodiments, at least one of the first reinforcing light source assembly 50 and the second reinforcing light source assembly 60 is provided with an angle adjustment structure 80 between itself and the housing 10. As an example, both the first supplementary lighting module 61 and the second supplementary lighting module 62 of the two second reinforcing light source assemblies 60 are provided with an angle adjustment structure 80 between themselves and the housing 10. This angle adjustment structure 80 includes mounting holes 81 and assembly holes 82 on the reinforcing light source assembly, and corresponding fixing holes 83 and adjustment holes 84 on the housing 10. The mounting holes 81 and assembly holes 82 can be located on the base, while the fixing holes 83 and adjustment holes 84 are located on the cover plate 14. The mounting holes 81 and fixing holes 83 are fixedly connected by fasteners, and the assembly holes 82 and adjustment holes 84 are connected by fasteners. By changing the connection position of the fasteners in the adjustment hole 84, the illumination angle of the reinforcing light source assembly can be adjusted, thereby flexibly adjusting the light illumination direction according to different detection needs and improving the accuracy and adaptability of the detection.

[0054] Please see Figure 5 In some structural forms, the adjustment hole 84 can be an arc-shaped hole. An arc-shaped hole provides a relatively smooth and continuous angle adjustment range, allowing the operator to freely adjust the position of the fastener within a certain arc range, achieving fine adjustment of the light illumination angle. The adjustment hole 84 can also be a long, narrow hole. Long, narrow holes have a simple structure and are 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 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. The operator can select appropriate holes to connect according to actual needs, achieving relatively precise angle positioning.

[0055] To facilitate the installation of the semi-transparent mirror 30 and the two diffuser plates 71, the two cover plates 14 are provided with corresponding mounting slots (not shown in the figure). The opposite sides of the semi-transparent mirror 30 and the two diffuser plates 71 can be inserted into the corresponding slots. This design makes the installation process simpler and faster, and can ensure the stability and accuracy of the installation.

[0056] Please see Figure 3 and Figure 4 To effectively address the heat dissipation problem generated during the operation of the light source, this embodiment also includes multiple cooling fans 92. These cooling fans 92 are mounted on the side plate 13 and accelerate airflow to promptly dissipate the heat generated by the light source during operation within the housing cavity 10a, thereby maintaining a suitable temperature environment within the housing cavity 10a and preventing the light source performance from degrading or being damaged due to overheating.

[0057] In some embodiments, the coaxial light source assembly 20, the first supplementary light source assembly 50, and the first supplementary light module 61 and the second supplementary light module 62 in the two second supplementary light source assemblies 60 all have independent control capabilities. This means that each light source module can be turned on, off, or have its brightness adjusted independently 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.

[0058] To achieve independent control of each light source module, please refer to [link / reference]. Figure 3 and Figure 4This embodiment also includes multiple signal interfaces 91. Each light source module is independently connected to a signal interface 91 to ensure the stability and accuracy of signal transmission. Through these signal interfaces 91, the control system can precisely send control commands to each light source module to adjust its working state and mode, thereby meeting the needs of different detection tasks. All of the signal interfaces 91 are located on the top plate 11.

[0059] 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.

[0060] 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 detection device (1) for detecting the appearance of a PCB board, 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). A coaxial light source assembly (20) is disposed within the receiving cavity (10a); A semi-transparent mirror (30) is disposed within the receiving cavity (10a) and located on the light emission path of the coaxial light source assembly (20). It is used to reflect the light emitted by the coaxial light source assembly (20) to the light emission port (10c) and to allow the imaging light returning from the light emission port (10c) to be transmitted to the detection port (10b); and A light-absorbing element (40) is disposed in the receiving cavity (10a) and located on the side of the semi-transparent mirror (30) away from the coaxial light source assembly (20), for absorbing stray light transmitted through the semi-transparent mirror (30). The transmittance of the semi-transparent mirror (30) is greater than its reflectance.

2. The light source detection device (1) as described in claim 1, characterized in that, The ratio of transmittance to reflectance of the semi-transparent and semi-reflective mirror (30) is (6:4) to (8:2).

3. The light source detection device (1) as described in claim 2, characterized in that, The ratio of transmittance to reflectance of the semi-transparent and semi-reflective mirror (30) is 7:

3.

4. The light source detection device (1) as described in claim 1, characterized in that, The thickness of the semi-transparent and semi-reflective mirror (30) is not less than 0.5 mm and not more than 1 mm.

5. The light source detection device (1) as described in claim 1, characterized in that, It also includes a fixing plate (15), which is disposed in the receiving cavity (10a) and located on the side of the semi-transparent mirror (30) away from the coaxial light source assembly (20). The fixing plate (15) has a fixing groove (151) on the side facing the semi-transparent mirror (30), and at least a portion of the semi-transparent mirror (30) is engaged in the fixing groove (151). The light-absorbing element (40) is disposed on the fixed plate (15).

6. The light source detection device (1) as described in claim 5, characterized in that, The light-absorbing element (40) is a light-absorbing cloth.

7. The light source detection device (1) as described in claim 1, characterized in that, It also includes a first reinforcing light source assembly (50), which is disposed in the receiving cavity (10a) and located below the coaxial light source assembly (20); The angle between the emitted light direction of the first reinforcing light source component (50) and the vertical direction is not greater than 30° and not less than 5°.

8. The light source detection device (1) as described in claim 7, characterized in that, It also includes two second supplementary light source components (60), which are disposed below the first supplementary light source component (50) and are located on opposite sides of the central axis of the light outlet (10c); The second reinforcing light source component (60) is configured to emit light of at least two different wavelengths, including visible light and invisible light.

9. The light source detection device (1) as described in claim 8, characterized in that, The coaxial light source assembly (20), the first reinforcing light source assembly (50) and the second reinforcing light source assembly (60) all include light-emitting elements, and the emission angle of the light-emitting elements is not greater than 60°.

10. The light source detection device (1) as described in claim 8, characterized in that, An angle adjustment structure (80) is provided between at least one of the first reinforcing light source assembly (50) and the second reinforcing light source assembly (60) and the housing (10). The angle adjustment structure (80) includes a mounting hole (81) and an assembly hole (82) provided on the reinforcing light source assembly, and a fixing hole (83) and an adjustment hole (84) provided on the housing (10). The mounting hole (81) and the fixing hole (83) are fixedly connected by fasteners, and the assembly hole (82) and the adjustment hole (84) are connected by fasteners. By changing the connection position of the fastener in the adjustment hole (84), the illumination angle of the reinforcing light source assembly can be adjusted.

Images