Scratch defect detection device
By optimizing the design of the cross-line scanning light source, the problem of detecting vertical stripe defects on the surface of highly reflective workpieces has been solved, and more efficient scratch defect detection has been achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-31
- Publication Date
- 2026-03-31
AI Technical Summary
Existing line scan light sources have difficulty effectively detecting vertical stripe defects that are roughly parallel to the direction of workpiece movement when inspecting highly reflective workpieces.
The cross-line scanning light source, including the first, second and third light-emitting components, is adopted. The light axis of the lamp beads is designed to be cross or tilted to ensure that the workpiece surface is illuminated by light from multiple angles. The optimized structure of the cross-line scanning light source improves the light illumination effect.
It improves the detection accuracy and effectiveness of scratch defects on the surface of highly reflective workpieces, enhances the uniformity of light irradiation, and significantly improves the detection effect.
Smart Images
Figure CN224066645U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of machine vision inspection technology, and in particular to a scratch defect detection device. Background Technology
[0002] Machine vision is a technology that uses machines to perform measurement and judgment, replacing human eyes. It is a rapidly developing branch of artificial intelligence. In machine vision inspection, the light source is a crucial component, and its quality directly affects the actual inspection results.
[0003] Current line scan light sources, when detecting scratch defects on the plane of highly reflective workpieces, provide less light along the movement direction of the highly reflective workpiece, thus making it difficult to detect vertical stripe defects that are roughly parallel to the movement direction of the highly reflective workpiece.
[0004] Therefore, it is necessary to design a scratch defect detection device to more accurately detect scratch defects on the surface of highly reflective workpieces.
[0005] The above information is provided as background information only to aid in understanding this disclosure and does not constitute an assertion or admission that any of the above content can be used as prior art relative to this disclosure. Utility Model Content
[0006] This invention provides a scratch defect detection device to more accurately detect scratch defects on the surface of highly reflective workpieces.
[0007] To achieve the above objectives, this utility model provides the following technical solution:
[0008] A scratch defect detection device includes a cross-line scanning light source;
[0009] The cross-line scanning light source includes a first light-emitting component, a second light-emitting component, and a third light-emitting component;
[0010] The first light-emitting component, the second light-emitting component, and the third light-emitting component emit light from the same side, and the second light-emitting component and the third light-emitting component are located on opposite sides of the first light-emitting component;
[0011] The first light-emitting component includes a first circuit board and an array of first LEDs mounted on the first circuit board, wherein the optical axis of the first LEDs is perpendicular to the first circuit board; the optical axis of the second LED in the second light-emitting component is deflected by the optical axis of the first LED, and the optical axis of the third LED in the third light-emitting component is deflected by the optical axis of the first LED.
[0012] Optionally, in the second light-emitting assembly, the optical axes of two adjacent second lamp beads are parallel to each other; in the third light-emitting assembly, the optical axes of two adjacent third lamp beads are parallel to each other.
[0013] Optionally, the optical axis of one of the second LEDs intersects at least the optical axis of one of the first LEDs, and the optical axis of one of the third LEDs intersects at least the optical axis of one of the first LEDs.
[0014] Optionally, the second light-emitting assembly includes at least three second circuit boards mounted at an angle, each second circuit board having a second LED installed on it; the third light-emitting assembly includes at least three third circuit boards mounted at an angle, each third circuit board having a third LED installed on it.
[0015] Optionally, the first circuit board is symmetrically arranged about a symmetrical vertical plane;
[0016] All the first LED beads are divided into a left LED bead group and a right LED bead group, and the left LED bead group and the right LED bead group are symmetrically arranged about the symmetrical vertical plane.
[0017] Optionally, the highest points of the first LED, the second LED, and the third LED are on the same horizontal plane.
[0018] Optionally, the cross-line scan light source further includes a focusing rod installed on the light-emitting side of the first light-emitting component and a diffuser plate installed on the side of the focusing rod away from the first light-emitting component;
[0019] The diffuser plate and the focusing rod are spaced apart.
[0020] Optionally, the scratch defect detection device further includes a three-channel control device, which controls the first light-emitting component, the second light-emitting component, and the third light-emitting component respectively;
[0021] The first light-emitting component can be turned on and off independently, the second light-emitting component can be turned on and off independently, and the third light-emitting component can be turned on and off independently.
[0022] Optionally, the scratch defect detection device further includes a housing and a heat dissipation device, wherein the first light-emitting component, the second light-emitting component and the third light-emitting component are all installed in the housing, and the heat dissipation device is installed on the housing to dissipate heat from the housing.
[0023] Optionally, the scratch defect detection device also includes a detection camera;
[0024] The vertical distance between the lens of the detection camera and the workpiece surface is 272±10mm, and the angle between the center line of the lens of the detection camera and the workpiece surface is 70°±1°.
[0025] The vertical distance between the cross-line scanning light source and the workpiece surface is 55±10mm, and the angle between the center line of the cross-line scanning light source and the workpiece surface is 55°±5°.
[0026] Compared with the prior art, the present invention has the following beneficial effects:
[0027] The scratch defect detection device provided by this utility model optimizes the structure of the cross-scan light source, so that the first light-emitting component emits light along the first direction, the second light-emitting component emits light at an angle relative to the first direction, and the third light-emitting component emits light at an angle relative to the first direction. Furthermore, the optical axis of the second lamp in the second light-emitting component is deflected by the optical axis of the first lamp, and the optical axis of the third lamp in the third light-emitting component is deflected by the optical axis of the first lamp. This allows the workpiece surface to receive better light illumination, effectively improving the scratch defect detection effect of workpieces, especially highly reflective workpieces.
[0028] This invention has other features and advantages that will be apparent from or will be set forth in detail in the accompanying drawings and the following detailed description, which together serve to explain the particular principles of this invention. Attached Figure Description
[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 these drawings without creative effort.
[0030] Figure 1 This is a schematic diagram of the installation structure of the cross-line scanning light source provided in an embodiment of this utility model;
[0031] Figure 2 This is a cross-sectional structural schematic diagram of the cross-line scanning light source provided in this embodiment of the utility model;
[0032] Figure 3 This is a schematic diagram showing the installation positions of the detection camera and the cross-line scanning light source provided in this embodiment of the utility model.
[0033] Reference numerals in the attached figures: 1. Cross-line scanning light source; 11. First light-emitting assembly; 111. First circuit board; 112. First LED; 12. Second light-emitting assembly; 121. Second circuit board; 122. Second LED; 13. Third light-emitting assembly; 131. Third circuit board; 132. Third LED; 14. Focusing rod; 15. Diffuser plate; 2. Housing; 3. Heat dissipation device; 4. Three-channel control device; 5. Detection camera. Detailed Implementation
[0034] To illustrate the possible application scenarios, technical principles, implementable specific solutions, and achievable objectives and effects of this application in detail, the following description, in conjunction with the listed specific embodiments and accompanying drawings, provides a detailed explanation. The embodiments described herein are merely illustrative of the technical solutions of this application and are therefore intended to limit the scope of protection of this application.
[0035] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.
[0036] Unless otherwise defined, the technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit this application.
[0037] In the description of this application, the term "and / or" is used to describe the logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and A and B exist simultaneously. Additionally, the character " / " in this document generally indicates that the preceding and following objects have an "or" logical relationship.
[0038] In this application, terms such as “first” and “second” are used only to distinguish one entity or operation from another, and do not necessarily require or imply any actual quantity, hierarchy or order relationship between these entities or operations.
[0039] Unless otherwise specified, the use of terms such as “comprising,” “including,” “having,” or other similar expressions in this application is intended to cover non-exclusive inclusion, which does not exclude the presence of additional elements in a process, method, or product that includes the stated elements, such that a process, method, or product that includes a list of elements may include not only those defined elements but also other elements not expressly listed, or elements inherent to such a process, method, or product.
[0040] Similar to the understanding in the Examination Guidelines, in this application, expressions such as "greater than," "less than," and "exceeding" are understood to exclude the stated number; expressions such as "above," "below," and "within" are understood to include the stated number. Furthermore, in the description of the embodiments in this application, "multiple" means two or more (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups" and "multiple times," unless otherwise explicitly specified.
[0041] In the description of the embodiments of this application, the space-related expressions used, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or drawings. They are only for the purpose of describing the specific embodiments of this application or for the reader's understanding, and do not indicate or imply 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, they should not be construed as limitations on the embodiments of this application.
[0042] Unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," "fixing," and "setting," as used in the description of the embodiments of this application, should be interpreted broadly. For example, "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 connection of two components or the interaction between two components. For those skilled in the art to which this application pertains, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.
[0043] In view of the deficiencies of existing scratch detection devices, the applicant, based on years of practical experience and professional knowledge in the design and manufacture of such products, and in conjunction with the application of theoretical principles, actively researched and innovated in order to create a device that could overcome the shortcomings of the existing technology and make the scratch defect detection device more practical. After continuous research, design, and repeated prototype production and improvement, this utility model with real practical value was finally created.
[0044] Please refer to Figures 1 to 3 This utility model provides a scratch defect detection device, characterized in that it includes a cross-line scanning light source 1; the cross-line scanning light source 1 includes a first light-emitting component 11, a second light-emitting component 12, and a third light-emitting component 13; the first light-emitting component 11, the second light-emitting component 12, and the third light-emitting component 13 emit light from the same side, and the second light-emitting component 12 and the third light-emitting component 13 are located on opposite sides of the first light-emitting component 11; the first light-emitting component 11 includes a first circuit board 111 and an array of first LED beads 112 mounted on the first circuit board 111, and the optical axis of the first LED beads 112 is perpendicular to the first circuit board 111; the optical axis of the second LED beads 122 in the second light-emitting component 12 is deflected by the optical axis of the first LED beads 112, and the optical axis of the third LED beads 132 in the third light-emitting component 13 is deflected by the optical axis of the first LED beads 112.
[0045] The scratch defect detection device provided in this embodiment optimizes the structure of the cross-scan light source so that the first light-emitting component 11 emits light along the first direction, the second light-emitting component 12 emits light at an angle relative to the first direction, and the third light-emitting component 13 emits light at an angle relative to the first direction. Furthermore, the optical axis of the second lamp bead 122 in the second light-emitting component 12 is deflected by the optical axis of the first lamp bead 112, and the optical axis of the third lamp bead 132 in the third light-emitting component 13 is deflected by the optical axis of the first lamp bead 112. This allows the workpiece surface to receive better light illumination, effectively improving the scratch defect detection effect of workpieces, especially highly reflective workpieces.
[0046] It should be added that the workpiece surface will be illuminated by light from three different angles, which makes it easier for the inspection camera 5 to detect scratches on the workpiece surface in various directions.
[0047] Optionally, in the second light-emitting assembly 12, the optical axes of two adjacent second lamp beads 122 are parallel to each other; in the third light-emitting assembly 13, the optical axes of two adjacent third lamp beads 132 are parallel to each other, thereby effectively improving the uniformity of illumination.
[0048] Optionally, the optical axis of a second LED 122 intersects at least the optical axis of a first LED 112, and the optical axis of a third LED 132 intersects at least the optical axis of a first LED 112. This allows more light to converge on the surface of the workpiece, and the intersecting light rays can make scratches more clearly visible.
[0049] Optionally, the second light-emitting assembly 12 includes at least three second circuit boards 121 mounted at an angle, each second circuit board 121 having a second LED 122 mounted on it; the third light-emitting assembly 13 includes at least three third circuit boards 131 mounted at an angle, each third circuit board 131 having a third LED 132 mounted on it. Figure 1 As shown, the second circuit board 121 and the third circuit board 131 are both inclined, and two adjacent second circuit boards 121 are arranged in parallel with a gap, and two adjacent third circuit boards 131 are arranged in parallel with a gap.
[0050] Preferably, the first LED 112 includes two LEDs with different light-emitting colors, and an LED with another light-emitting color is arranged between the two LEDs with the same light-emitting color, so as to meet the detection needs of workpieces with different colors.
[0051] Optionally, the first circuit board 111 is arranged symmetrically about the vertical plane; all the first LEDs 112 are divided into a left LED group and a right LED group, which are arranged symmetrically about the vertical plane to improve the uniformity of illumination.
[0052] Optionally, the highest points of the first LED 112, the second LED 122, and the third LED 132 are on the same horizontal plane to improve the uniformity of illumination and to help reduce the total height of the cross-scan light source 1.
[0053] Optionally, the cross-line scan light source 1 also includes a focusing rod 14 installed on the light-emitting side of the first light-emitting component 11 and a diffuser plate 15 installed on the side of the focusing rod 14 away from the first light-emitting component 11; the diffuser plate 15 and the focusing rod 14 are spaced apart.
[0054] Optionally, the scratch defect detection device further includes a three-channel control device 4, which controls the first light-emitting component 11, the second light-emitting component 12, and the third light-emitting component 13 respectively. The first light-emitting component 11, the second light-emitting component 12, and the third light-emitting component 13 can be turned on and off independently. Specifically, in this embodiment, the cross-line scan light source 1 can turn on the first light-emitting component 11 alone, thus forming a normal line scan light source, or two of the first light-emitting component 11, the second light-emitting component 12, and the third light-emitting component 13 can be turned on to provide different lighting effects.
[0055] Optionally, the scratch defect detection device also includes a housing 2 and a heat dissipation device 3. The first light-emitting component 11, the second light-emitting component 12 and the third light-emitting component 13 are all installed in the housing 2, and the heat dissipation device 3 is installed on the housing 2 to dissipate heat from the housing 2.
[0056] Optionally, the scratch defect detection device also includes a detection camera 5; the detection camera 5 is used to photograph the workpiece to detect scratch defects. The vertical distance from the lens of the detection camera 5 to the workpiece surface is 272±10mm, and the angle between the center line of the lens of the detection camera 5 and the workpiece surface is 70°±1°; the vertical distance from the cross-line scanning light source 1 to the workpiece surface is 55±10mm, and the angle between the center line of the cross-line scanning light source 1 and the workpiece surface is 55°±5°. Based on actual detection results, the detection effect is significantly better under the above installation structure.
[0057] Finally, it should be noted that although the above embodiments have been described in the text and drawings of this application, this should not limit the scope of patent protection of this application. Any technical solutions that are based on the essential concept of this application and utilize the content described in the text and drawings of this application, resulting in equivalent structural or procedural substitutions or modifications, as well as the direct or indirect application of the technical solutions of the above embodiments to other related technical fields, are all included within the scope of patent protection of this application.
Claims
1. A scratch defect detection apparatus characterized by comprising: The cross-line scanning light source (1) comprises a first light-emitting component (11), a second light-emitting component (12) and a third light-emitting component (13); The first light-emitting component (11), the second light-emitting component (12) and the third light-emitting component (13) emit light on the same side, and the second light-emitting component (12) and the third light-emitting component (13) are located on the opposite sides of the first light-emitting component (11); The first light-emitting component (11) comprises a first circuit board (111) and a first lamp bead (112) arrayed on the first circuit board (111), and the optical axis of the first lamp bead (112) is perpendicular to the first circuit board (111); the optical axis of a second lamp bead (122) in the second light-emitting component (12) is inclined to the optical axis of the first lamp bead (112), and the optical axis of a third lamp bead (132) in the third light-emitting component (13) is inclined to the optical axis of the first lamp bead (112). In the second light-emitting component (12), the optical axes of two adjacent second lamp beads (122) are parallel to each other; in the third light-emitting component (13), the optical axes of two adjacent third lamp beads (132) are parallel to each other.
2. The scratch defect detection apparatus according to claim 1, characterized by The optical axis of one second lamp bead (122) intersects with at least one optical axis of the first lamp bead (112), and the optical axis of one third lamp bead (132) intersects with at least one optical axis of the first lamp bead (112).
3. The scratch defect detection apparatus according to claim 1, characterized by The second light-emitting component (12) comprises at least three second circuit boards (121) installed obliquely, and each second circuit board (121) is provided with a second lamp bead (122); the third light-emitting component (13) comprises at least three third circuit boards (131) installed obliquely, and each third circuit board (131) is provided with a third lamp bead (132).
4. The scratch defect detection apparatus according to claim 1, characterized by The first circuit board (111) is symmetrically arranged about a symmetric vertical plane; 5. The scratch defect detection apparatus according to claim 1, wherein All the first lamp beads (112) are divided into a left lamp bead group and a right lamp bead group, and the left lamp bead group and the right lamp bead group are symmetrically arranged about the symmetric vertical plane. The highest points of the first lamp bead (112), the second lamp bead (122) and the third lamp bead (132) are on the same horizontal plane.
6. The scratch defect detection apparatus according to claim 1, wherein The cross-line scanning light source (1) further comprises a light collecting rod (14) installed on the light-emitting side of the first light-emitting component (11) and a diffusion plate (15) installed on the side of the light collecting rod (14) away from the first light-emitting component (11); 7. The scratch defect detection apparatus according to claim 1, wherein The diffusion plate (15) and the light collecting rod (14) are arranged in a spaced manner. A three-channel control device (4) is further included, which controls the first light-emitting component (11), the second light-emitting component (12) and the third light-emitting component (13) respectively; 8. The scratch defect detection apparatus according to claim 1, wherein The first light-emitting component (11) can be independently turned on and off, the second light-emitting component (12) can be independently turned on and off, and the third light-emitting component (13) can be independently turned on and off. 9. The scratch defect detection apparatus according to claim 1, wherein The shell (2) and the heat dissipation device (3) are further included, the first light emitting assembly (11), the second light emitting assembly (12) and the third light emitting assembly (13) are all installed in the shell (2), and the heat dissipation device (3) is installed on the shell (2) to dissipate heat for the shell (2).
10. The scratch defect detection apparatus according to claim 1, wherein A detection camera (5) is further included. The vertical distance range of the lens of the detection camera (5) to the workpiece surface is 272±10mm, and the included angle range of the lens center line of the detection camera (5) and the workpiece surface is 70°±1°. The vertical distance range of the cross line scanning light source (1) to the workpiece surface is 55±10mm, and the included angle range of the center line of the cross line scanning light source (1) and the workpiece surface is 55°±5°.