Appearance defect detection combined light source and machine vision detection device
Through combined light source design, efficient and accurate appearance detection of complex workpieces is achieved, and the problems of complex equipment and long time in traditional detection methods are solved, and the detection accuracy and efficiency are improved.
Patent Information
- Application Number
- CN202421296814.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-06
- Publication Date
- 2025-07-29
- Estimated Expiration
- 2034-06-06
AI Technical Summary
The traditional appearance detection method requires multiple workstations to be inspected due to the complex structure of the workpiece and the variety of defects, resulting in complex equipment, high cost and long inspection time.
The combined light source design of a coaxial light source, the first arc light source, the second arc light source and the third arc light source are adopted. Efficient and accurate detection is achieved through refined light source configuration. The light source partition is equipped with a diffusing plate, a film sheet and a light concentrating rod. The tilt angle of the light source is adjustable and integrated in a detection station for multi-angle detection.
It reduces the space occupied by the mechanism, shortens the detection time, improves the detection accuracy and efficiency, and reduces the complexity and cost of equipment.
Smart Images
Figure CN223166570U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of machine vision detection, in particular to a combined light source for appearance defect detection and a machine vision detection device. Background Art
[0002] In the current manufacturing and detection fields, for products such as Bluetooth headsets, headset cases, and mobile phone middle frames with special workpiece structures and numerous defect detection items, the appearance detection process usually faces a series of challenges. Due to the complexity of the workpiece structure and the diversity of the types of defects to be detected, traditional detection methods often require lighting devices to be set up at multiple different workstations in order to achieve comprehensive and detailed detection, resulting in a significant increase in the occupation of institutional space.
[0003] In addition, this multi-station detection method not only increases the complexity and cost of the equipment, but also makes the entire detection process time-consuming because the workpiece needs to be moved and fly-shot at each workstation (i.e., the workpiece is photographed during the rapid movement). Specifically, although the moving fly-shot technology improves the detection efficiency, due to the need to frequently move the workpiece between multiple workstations, the cycle time CT (Cycle Time, that is, the time required to complete a complete production cycle) of the production line is significantly extended.
[0004] In order to address these challenges, improve the detection efficiency and reduce the production cost, it is particularly necessary to improve the existing technology.
[0005] The above information is given as background information only to assist in understanding the present disclosure, and does not determine or admit whether any of the above content can be used as the prior art relative to the present disclosure. Summary of the Utility Model
[0006] The utility model provides a combined light source for appearance defect detection and a machine vision detection device to solve the problems existing in the prior art.
[0007] To achieve the above object, the utility model provides the following technical solutions:
[0008] In the first aspect, the utility model provides a combined light source for appearance defect detection, including a coaxial light source, a first arc light source, a second arc light source, and a third arc light source; wherein,
[0009] The arc-shaped light-emitting surface of the first arc light source faces downward, and the first arc light source is provided with an avoidance hole; the arc-shaped light-emitting surface of the first arc light source and the avoidance hole are located in the same vertical plane;
[0010] The coaxial light source is arranged above the first arc light source, and the light-emitting surface of the coaxial light source faces the avoidance hole;
[0011] The second arc-shaped light source is located on one side of the first arc-shaped light source, and the arc-shaped light-emitting surface of the second arc-shaped light source is inclined downward toward the lower part of the first arc-shaped light source;
[0012] The third arc-shaped light source is located on the opposite side of the first arc-shaped light source, and the arc-shaped light-emitting surface of the third arc-shaped light source is inclined downward toward the lower part of the first arc-shaped light source;
[0013] The first arc-shaped light source includes two independently controlled light source partitions. A diffuser plate is arranged on the light-emitting surface of one of the light source partitions, and a film is arranged on the light-emitting surface of the other light source partition;
[0014] A condenser rod is arranged on the arc-shaped light-emitting surface of the second arc-shaped light source;
[0015] The third arc-shaped light source is a combined light source formed by overlapping two arc-shaped light sources.
[0016] Furthermore, the appearance defect detection combined light source further includes a housing;
[0017] The coaxial light source, the first arc-shaped light source, the second arc-shaped light source, and the third arc-shaped light source are all arranged in the housing;
[0018] The housing is provided with a vision acquisition opening corresponding to the position of the imaging hole of the coaxial light source.
[0019] Furthermore, in the appearance defect detection combined light source, the coaxial light source is a high-brightness coaxial light source.
[0020] Furthermore, in the appearance defect detection combined light source, the coaxial light source is a coaxial light source of red, green, blue, and white four colors.
[0021] Furthermore, in the appearance defect detection combined light source, the first arc-shaped light source and the second arc-shaped light source are both white light arc-shaped light sources;
[0022] The third arc-shaped light source is two white light arc-shaped light sources.
[0023] Furthermore, in the appearance defect detection combined light source, the inclination angles of the second arc-shaped light source and the third arc-shaped light source are adjustable.
[0024] Furthermore, in the appearance defect detection combined light source, the adjustable inclination angle range of the second arc-shaped light source and the third arc-shaped light source is greater than 0° and less than 60°.
[0025] In a second aspect, the present invention provides a machine vision detection device, including a camera and the appearance defect detection combined light source provided in the first aspect as described above;
[0026] The camera is located above the coaxial light source and is directly opposite the imaging hole of the coaxial light source.
[0027] Compared with the prior art, the utility model has the following beneficial effects:
[0028] An appearance defect detection combined light source and a machine vision detection device provided by the utility model organically combine a coaxial light source, a first arc light source, a second arc light source, and a third arc light source. That is, the coaxial light source and the first arc light source are arranged up and down, and the second arc light source and the third arc light source are respectively located on both sides of the first arc light source and inclined downward toward the lower part of the first arc light source. The first arc light source is provided with two independently controlled light source partitions. A diffuser plate is arranged on the light emitting surface of one of the light source partitions, and a film is arranged on the light emitting surface of the other light source partition. A condenser rod is arranged on the arc-shaped light emitting surface of the second arc light source, and the third arc light source is a combined light source formed by overlapping two arc light sources. This enables each detection item to be integrated at one detection station. When the mechanism grabs the workpiece and moves for flying shooting, only the workpiece needs to be moved to the detection position and rotated to the specified detection angle, and each light source is exposed in sequence to cooperate with the detection of corresponding defects, which helps to reduce the occupation of the mechanism space, shorten the detection time, and improve the detection accuracy and efficiency.
[0029] The utility model has other characteristics and advantages, which will be obvious from the accompanying drawings incorporated herein and the subsequent detailed description, or will be described in detail in the accompanying drawings incorporated herein and the subsequent detailed description. These accompanying drawings and detailed description are jointly used to explain the specific principles of the utility model. BRIEF DESCRIPTION OF THE DRAWINGS
[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the following-described accompanying drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other accompanying drawings can be obtained based on these drawings without creative efforts.
[0031] Figure 1 It is a (three-dimensional) structure schematic diagram of an appearance defect detection combined light source provided by Embodiment 1 of the present utility model;
[0032] Figure 2 It is a (three-dimensional) structure schematic diagram of an appearance defect detection combined light source (with a housing) provided by Embodiment 1 of the present utility model;
[0033] Figure 3 It is a (bottom view) structure schematic diagram of an appearance defect detection combined light source provided by Embodiment 1 of the present utility model;
[0034] Figure 4 It is a structural (three-dimensional) schematic diagram of the first arc light source, the second arc light source, and the third arc light source provided in the first embodiment of the present utility model;
[0035] Figure 5 It is a structural (front view) schematic diagram of a machine vision detection device provided in the second embodiment of the present utility model.
[0036] Reference numerals:
[0037] Coaxial light source 1, first arc light source 2, second arc light source 3, third arc light source 4, avoidance hole 5, housing 6, vision acquisition opening 7, camera 8. Specific implementation manners
[0038] To describe in detail the possible application scenarios, technical principles, specific implementable solutions, achievable purposes and effects, etc. of the present application, the following is described in detail in combination with the listed specific embodiments and with reference to the accompanying drawings. The embodiments described herein are only used to more clearly illustrate the technical solutions of the present application, and therefore are only used as examples and cannot be used to limit the protection scope of the present application.
[0039] Referring to "embodiment" herein means that the specific features, structures or characteristics described in connection with the embodiment may be included in at least one embodiment of the present application. The term "embodiment" appearing at various positions in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or relevance to other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, the technical features mentioned in each embodiment can be combined in any way to form the corresponding implementable technical solutions.
[0040] Unless otherwise defined, the meanings of the technical terms used herein are the same as those generally understood by those skilled in the technical field to which the present application belongs; the use of the relevant terms herein is only for describing specific embodiments and is not intended to limit the present application.
[0041] In the description of the present application, the term "and / or" is an expression used to describe the logical relationship between objects, indicating that three relationships may exist. For example, A and / or B means: there is A, there is B, and there is both A and B at the same time. In addition, the character " / " herein generally represents an "or" logical relationship between the associated objects before and after.
[0042] In the present application, terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual quantity, primary or secondary, or order relationship between these entities or operations.
[0043] Without further limitations, in this application, the terms "comprising", "including", "having" or other similar expressions used in a statement are intended to cover non-exclusive inclusion. These expressions do not exclude the possibility that there may be additional elements in a process, method or product that includes the said elements. Thus, a process, method or product that includes a series of elements may include not only those defined elements, but also other elements not explicitly listed, or elements inherent to such a process, method or product.
[0044] Similar to the understanding in the Examination Guidelines, in this application, expressions such as "greater than", "less than", "exceeding" are understood not to include the relevant number; expressions such as "above", "below", "within" are understood to include the relevant number. In addition, in the description of the embodiments of this application, the meaning of "a plurality of" is two or more (including two). Similar expressions related to "many", such as "multiple groups", "multiple times", etc., are understood in the same way, unless otherwise specifically and clearly defined.
[0045] In the description of the embodiments of this application, the spatially related expressions used, such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "perpendicular", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiment or the drawings. This is only for the convenience of describing the specific embodiments of this application or for the reader's understanding, rather than indicating or implying that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, it should not be construed as a limitation on the embodiments of this application.
[0046] Unless otherwise clearly specified or limited, in the description of the embodiments of this application, the terms "installed", "connected", "joined", "fixed", "set", etc. should be understood in a broad sense. For example, the said "connection" can be a fixed connection, a detachable connection, or an integral setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art to which this application pertains, the specific meanings of the above terms in the embodiments of this application can be understood according to specific circumstances.
[0047] Embodiment 1
[0048] In view of the defects existing in the above-mentioned prior art, the applicant, based on rich practical experience and professional knowledge in the design and manufacture of such products for many years, and in cooperation with the application of theory, actively conducts research and innovation in the hope of creating a technology that can solve the defects in the prior art. After continuous research, design, and repeated sample making and improvement, a practical and valuable utility model has finally been created.
[0049] Please refer to Figures 1-4 , an appearance defect detection combined light source device has been carefully designed in the embodiment of the present utility model. This device combines various light source types such as coaxial light sources and arc light sources, aiming to achieve efficient and accurate detection of workpiece appearance defects through refined light source configuration. Specifically, this device includes a coaxial light source 1, a first arc light source 2, a second arc light source 3, and a third arc light source 4.
[0050] The design of the first arc light source 2 is particularly unique. Its arc-shaped light-emitting surface is arranged downward, and an avoidance hole 5 is ingeniously opened in its structure. This avoidance hole 5 and the arc-shaped light-emitting surface of the first arc light source 2 are located in the same vertical plane, providing convenience for subsequent light source configuration.
[0051] The coaxial light source 1 is accurately set directly above the first arc light source 2, and its light-emitting surface is directly aligned with the avoidance hole 5 below. This configuration enables the light of the coaxial light source 1 to be accurately projected onto a specific area of the workpiece to be detected, ensuring the accuracy and efficiency of the detection process.
[0052] The second arc light source 3 is located on one side of the first arc light source 2. Its arc-shaped light-emitting surface is not simply parallel to the first arc light source 2, but is inclined downward towards the lower part of the first arc light source 2. This inclined design enables the second arc light source 3 to cover areas that are difficult for the first arc light source 2 to reach, thereby achieving more comprehensive detection.
[0053] Corresponding to the second arc light source 3, the third arc light source 4 is located on the other side of the first arc light source 2. Its design principle is the same as that of the second arc light source 3, and it also adopts the method of an arc-shaped light-emitting surface inclined downward to ensure non-blind detection of different areas of the workpiece.
[0054] Furthermore, the first arc light source 2 has been innovatively divided in its structure, including two independently controlled light source zones. The light-emitting surface of one light source zone is equipped with a diffuser plate, while the light-emitting surface of the other light source zone is installed with a film. This configuration enables the first arc light source 2 to flexibly adjust the light intensity and irradiation range according to different detection requirements, achieving more refined detection.
[0055] The arc-shaped light-emitting surface of the second arc-shaped light source 3 is equipped with a light condensing rod. This design can enhance the concentration and brightness of the light, ensuring accurate detection of even the smallest defects on the surface of the workpiece.
[0056] The third arc-shaped light source 4 adopts a more unique design. It is formed by superimposing two arc-shaped light sources, forming a more powerful light source combination. This design enables the third arc-shaped light source 4 to provide more uniform and stable light, ensuring comprehensive and detailed detection of the workpiece.
[0057] In summary, through the carefully designed combined light source device in the embodiment of the present utility model, efficient and accurate detection of the appearance defects of the workpiece is achieved. This device not only has the advantages of a compact structure and simple operation, but also can greatly improve the detection accuracy and efficiency, bringing greater economic benefits and market competitiveness to the enterprise.
[0058] Please refer again to Figure 2 In this embodiment, the combined light source for appearance defect detection is further optimized and improved. Specifically, the combined light source is increased with a well-designed housing 6. This housing not only provides stable support and protection for the internal light source components, but also realizes the integrated design of the entire detection system.
[0059] Specifically, the coaxial light source 1, the first arc-shaped light source 2, the second arc-shaped light source 3, and the third arc-shaped light source 4 are all cleverly arranged inside the housing 6. This layout not only ensures the stability and safety of the light source, but also makes the entire system more compact, easier to install and maintain.
[0060] In addition, to meet the requirements of visual acquisition, a visual acquisition opening 7 is specially opened at the image-taking hole position of the housing 6 corresponding to the coaxial light source 1. This design enables the visual acquisition device to directly capture the light projected by the coaxial light source 1 onto the object to be detected through the opening 7, thereby realizing clear imaging and accurate detection of the defects on the surface of the object.
[0061] In this embodiment, the combined light source for appearance defect detection is further optimized. In particular, the coaxial light source 1 is selected as a high-brightness coaxial light source. This selection is based on a comprehensive consideration of the moving speed of the workpiece to be detected and the requirements for the brightness of the light source.
[0062] In the actual detection process, due to the relatively fast moving speed of the workpiece to be detected, the conventional coaxial light source may cause ghosting during imaging due to relatively weak brightness, which will affect the accuracy and efficiency of defect detection. To overcome this problem, a high-brightness coaxial light source is selected in this embodiment. The high-brightness coaxial light source can provide higher brightness, ensuring that the light source can still maintain sufficient brightness when the workpiece is moving at high speed, making the imaging clearer and effectively avoiding the generation of ghosting.
[0063] By adopting a high-brightness coaxial light source, the appearance defect detection combined light source system in this embodiment not only improves the accuracy and efficiency of detection, but also further enhances the stability and reliability of the system.
[0064] In this embodiment, the appearance defect detection combined light source has been further optimized, especially in the design of the coaxial light source. Specifically, the coaxial light source 1 is designed as a coaxial light source with red, green, blue, and white lights, and this design aims to meet the detection requirements of workpieces with different colors and backgrounds.
[0065] During the detection process, the coaxial light source 1 is mainly used to detect defects such as scratches on the plane. However, due to the diverse colors of some workpiece styles and the interference of background colors, a single white light source may not meet all detection requirements. Therefore, this embodiment selects a coaxial light source with red, green, blue, and white lights so that different colors of light sources can be switched according to needs during the detection process.
[0066] By selecting light with a suitable wavelength band, the interference of the corresponding background color can be eliminated, making the effect of slight scratches more prominent. This design of multi-color light sources not only improves the accuracy and reliability of detection, but also enhances the adaptability and flexibility of the system. Whether in the detection of workpieces with a single color or in the case of interference from complex background colors, the coaxial light source 1 in this embodiment can provide efficient and accurate detection results.
[0067] In this embodiment, in order to further improve the comprehensiveness and accuracy of appearance defect detection, the first arc light source 2 and the second arc light source 3 are both designed as white light arc light sources;
[0068] The third arc light source 4 is two white light arc light sources.
[0069] The white light arc light source is widely used in various surface detection fields due to its uniform and soft lighting effect. In this embodiment, the arc-shaped light-emitting surfaces of the first arc light source 2, the second arc light source 3, and the third arc light source 4 face different directions to form a multi-angle and all-round lighting layout. This layout can ensure that all areas of the surface of the object to be detected are fully illuminated, so as to more accurately detect potential defects.
[0070] At the same time, due to the stable lighting effect and easy control of the white light arc light source, the brightness and angle of the light source can be adjusted according to actual needs during the detection process to obtain the best detection effect. In addition, the white light arc light source also has a long service life and low maintenance cost, and can meet the detection needs of long hours and high intensity.
[0071] In this embodiment, in order to further enhance the flexibility and adaptability of the appearance defect detection combined light source system, the tilt angles of the second arc light source 3 and the third arc light source 4 are designed to be adjustable. This design allows users to adjust the tilt angles of the light sources according to specific detection requirements and workpiece characteristics to optimize the lighting effect and detection accuracy.
[0072] Specifically, the adjustable tilt angle range of the second arc light source 3 and the third arc light source 4 is set to be greater than 0° and less than 60°. This angle range covers most common detection scenarios, and users can make fine adjustments according to the actual situation. For example, when there are complex textures or shadows on the surface of the workpiece to be detected, by adjusting the tilt angle of the light source, these interference factors can be eliminated, making it easier to detect defects.
[0073] In addition, the adjustable tilt angle also enables the system to adapt to workpieces of different sizes and shapes. For larger workpieces, the lighting range can be expanded by increasing the tilt angle of the light source; for smaller workpieces, the tilt angle can be reduced to concentrate the lighting. This flexibility greatly improves the versatility and ease of use of the system.
[0074] Although terms such as coaxial light source, first arc light source, second arc light source, and third arc light source are used more frequently in this application, the possibility of using other terms is not excluded. Using these terms is only for more conveniently describing and explaining the essence of the present utility model; interpreting them as any additional limitation is contrary to the spirit of the present utility model.
[0075] A combined light source for appearance defect detection provided by the present utility model organically combines a coaxial light source, a first arc light source, a second arc light source, and a third arc light source. That is, the coaxial light source and the first arc light source are arranged vertically, and the second arc light source and the third arc light source are respectively located on both sides of the first arc light source and inclined downward towards the first arc light source. The first arc light source is provided with two independently controlled light source zones. A diffuser plate is arranged on the light emitting surface of one of the light source zones, and a film is arranged on the light emitting surface of the other light source zone. A condenser rod is arranged on the arc-shaped light emitting surface of the second arc light source. The third arc light source is a combined light source formed by overlapping two arc light sources, so that each detection item is integrated at a detection station. When the mechanism grabs the workpiece and moves for flying shooting, only the workpiece needs to be moved to the detection position and rotated to the specified detection angle, and each light source is exposed in sequence to cooperate with the detection of corresponding defects, which helps to reduce the occupation of the mechanism space, shorten the detection time, and improve the detection accuracy and efficiency.
[0076] Embodiment 2
[0077] Please refer to Figure 5, an embodiment of the present utility model provides a machine vision detection device, which includes a camera 8 and an appearance defect detection combined light source provided in the above-mentioned first embodiment;
[0078] The camera 8 is located above the coaxial light source 1 and is directly opposite the imaging hole of the coaxial light source 1.
[0079] It should be noted that such a layout ensures that the camera 8 can directly capture the light projected by the coaxial light source 1 onto the surface of the workpiece and obtain clear and accurate image data through the imaging hole.
[0080] A machine vision detection device provided by the present utility model organically combines a coaxial light source, a first arc light source, a second arc light source, and a third arc light source. That is, the coaxial light source and the first arc light source are arranged up and down, and the second arc light source and the third arc light source are respectively located on both sides of the first arc light source and inclined downward toward the first arc light source. The first arc light source includes two independently controlled light source partitions. A diffuser plate is provided on the light emitting surface of one of the light source partitions, and a film is provided on the light emitting surface of the other light source partition. A condenser rod is provided on the arc-shaped light emitting surface of the second arc light source. The third arc light source is a combined light source formed by overlapping two arc light sources. This enables each detection item to be integrated at one detection station. When the mechanism grabs the workpiece and moves for flying shooting, only the workpiece needs to be moved to the detection position and rotated to the specified detection angle, and the light sources are exposed in sequence to cooperate with the detection of corresponding defects, which helps to reduce the occupation of the mechanism space, shorten the detection time, and improve the detection accuracy and efficiency.
[0081] Finally, it should be noted that although the above-mentioned embodiments have been described in the text and drawings of the specification of the present application, the patent protection scope of the present application cannot be limited thereby. Any technical solutions obtained by equivalent structure or equivalent process substitution or modification based on the essential concept of the present application and using the content recorded in the text and drawings of the specification of the present application, as well as those directly or indirectly implementing the technical solutions of the above embodiments in other related technical fields, are all included in the patent protection scope of the present application.
Claims
1. A combined light source for appearance defect detection, characterized in that, It includes a coaxial light source (1), a first arc light source (2), a second arc light source (3), and a third arc light source (4); wherein, The arc-shaped light-emitting surface of the first arc light source (2) faces downward, and the first arc light source (2) is provided with an avoidance hole (5); the arc-shaped light-emitting surface of the first arc light source (2) and the avoidance hole (5) are located in the same vertical plane; The coaxial light source (1) is arranged above the first arc light source (2), and the light-emitting surface of the coaxial light source (1) faces the avoidance hole (5); The second arc light source (3) is located on one side of the first arc light source (2), and the arc-shaped light-emitting surface of the second arc light source (3) is inclined downward towards the lower part of the first arc light source (2); The third arc light source (4) is located on the opposite side of the first arc light source (2), and the arc-shaped light-emitting surface of the third arc light source (4) is inclined downward towards the lower part of the first arc light source (2); The first arc light source (2) includes two independently controlled light source partitions, wherein a diffuser plate is arranged on the light-emitting surface of one of the light source partitions, and a film is arranged on the light-emitting surface of the other light source partition; A condenser rod is arranged on the arc-shaped light-emitting surface of the second arc light source (3); The third arc light source (4) is a combined light source formed by stacking two arc light sources.
2. The combined light source for appearance defect detection according to claim 1, wherein It further includes a housing (6); The coaxial light source (1), the first arc light source (2), the second arc light source (3), and the third arc light source (4) are all arranged inside the housing (6); The housing (6) is provided with a visual acquisition opening (7) corresponding to the position of the image-taking hole of the coaxial light source (1).
3. The combined light source for appearance defect detection according to claim 1, wherein The coaxial light source (1) is a high-brightness coaxial light source.
4. The combined light source for appearance defect detection according to claim 1 or 3, characterized in that The coaxial light source (1) is a coaxial light source of red, green, blue, and white four colors.
5. The appearance defect detection combined light source according to claim 1, characterized in that, Both the first arc light source (2) and the second arc light source (3) are white light arc light sources; The third arc light source (4) is two white light arc light sources.
6. The appearance defect detection combined light source according to claim 1, characterized in that, The inclination angles of the second arc light source (3) and the third arc light source (4) are adjustable.
7. The appearance defect detection combined light source according to claim 6, wherein The adjustable inclination angle range of the second arc light source (3) and the third arc light source (4) is greater than 0° and less than 60°.
8. A machine vision detection device, characterized in that, It includes a camera (8) and an appearance defect detection combined light source as described in any one of claims 1-7; The camera (8) is located above the coaxial light source (1) and faces the image-taking hole of the coaxial light source (1).