CN216284966U - Surface defect detection device - Google Patents
Surface defect detection device Download PDFInfo
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- CN216284966U CN216284966U CN202121476215.2U CN202121476215U CN216284966U CN 216284966 U CN216284966 U CN 216284966U CN 202121476215 U CN202121476215 U CN 202121476215U CN 216284966 U CN216284966 U CN 216284966U
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Abstract
The utility model provides a surface defect detection device, which comprises a camera, a lens and an objective table, wherein the objective table is provided with a plurality of lens holes; the camera, the lens and the objective table are sequentially arranged in the same axial direction; the two sides of the lens on the axial direction are planes; the lens comprises a plurality of shading blocks which are uniformly distributed; when the camera images, if the surface is flat and the light reflected by the surface is vertical to the plane, the formed image is completely the same as the overlook image of the lens, if the surface has defects such as concave, convex and the like, the light reflected by the surface into the lens can be subjected to diffuse reflection, and the formed image is different from the overlook image of the lens due to different refractive indexes of the lens and air for light, the different positions are the positions where the defects exist, and the positions of the defects can be judged through the deformation of the shading blocks when the defects and the background have the same color, so that the positions of the defects can be obtained by obtaining the corresponding images through the camera, and the detection efficiency of the surface defects and the background have the same color is improved.
Description
Technical Field
The utility model relates to the field of defect detection, in particular to a surface defect detection device.
Background
The nanocrystalline is an ideal magnetic conductive and electromagnetic shielding material due to high magnetic conductivity and saturation magnetic induction intensity, and gradually becomes a common material in the wireless charging technology. However, the nanocrystalline has small resistivity and high loss, and the charging efficiency of the material can be reduced in the charging process; therefore, in the actual use process, a broken magnetic process is usually introduced, namely the nanocrystalline is divided into small units and then applied, so that the loss in the charging process is reduced, and the efficiency is improved.
After the nanocrystalline strip is rolled by the broken magnetic roller, a small amount of scrap particles are generated. The nanocrystalline finished product is formed by compounding multiple layers, foreign particles are mixed in the nanocrystalline finished product, surface bulges can appear, and the nanocrystalline particle bulges can pierce an insulating layer of a receiving end coil, so that the charging efficiency is reduced; and battery explosion can be caused in the charging process due to the excessive thickness, so that corresponding detection measures are usually adopted in the production process to avoid the defective products from leaving the factory.
The detection means that uses at present commonly used is that 3D probe detects material thickness to combine 2D camera to detect the material surface badly. However, the 3D probe is point-contact, and the working mode of the 3D probe is to detect the thickness at a certain number of point positions, which has a good effect on the overall material thickness defect, but the bulge defect caused by the foreign particles is randomly and respectively on the material surface, and there is usually no regularity, and at this time, the 3D probe cannot efficiently and thoroughly detect the defect. The 2D camera shoots the surface of the material by using an orthographic projection mode, has a good effect on foreign matters with contrast ratio in color difference, and has a small bulge on the surface of the material, so that the camera cannot detect the difference between the single-color surface bulge and the background from the orthographic projection because the bulge and the material are made of the same material, and the defect cannot be detected.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is as follows: provided is a surface defect detection device capable of accurately detecting a bulge caused by foreign particles.
In order to solve the technical problems, the utility model adopts the technical scheme that:
a surface defect detection device comprises a camera, a lens and an objective table;
the camera, the lens and the objective table are sequentially arranged in the same axial direction;
the two sides of the lens in the axial direction are planes;
the lens comprises a plurality of shading blocks which are uniformly distributed.
Further, the plurality of light shielding blocks are identical.
Further, the shading block is a lighttight cylinder.
Further, the height of the light shielding block is smaller than the thickness of the lens, and the height of the light shielding block is perpendicular to the plane.
Further, the shading blocks are arranged in an array.
Further, the distances between two adjacent light shielding blocks are equal.
Further, still include the camera lens, the camera lens sets up between camera and the lens.
Further, the light source is a coaxial light source.
Further, the camera is a CCD black and white camera.
The utility model has the beneficial effects that: the camera, the lens and the objective table are sequentially arranged in the same axial direction, the objective table is used for placing an object to be measured, two sides of the lens in the axial direction are planes, a plurality of shading blocks which are uniformly distributed are arranged in the lens, when the camera images, if the surface is flat, light reflected by the surface is perpendicular to the planes, the formed image is completely the same as a top-view image of the lens, if the surface has defects of depression, protrusion and the like, the light reflected into the lens from the surface cannot vertically pass through the lens, a diffuse reflection phenomenon can occur on the surface of the shading blocks, due to different light refractive indexes of the lens and air, the formed image is different from the top-view image of the lens, different places are the positions of the bulges, when the bulges and the background have the same color, the positions of the bulges can be judged through deformation of the shading blocks, so that the defect positions can be obtained through the camera, accurate detection of the bulge caused by the foreign particles is achieved.
Drawings
FIG. 1 is a front view of a surface defect detecting apparatus according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view of a lens according to an embodiment of the utility model;
FIG. 3 is a top view of a lens according to an embodiment of the utility model;
FIG. 4 is a schematic diagram of a bump image according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a defect detection apparatus according to an embodiment of the present invention;
description of reference numerals:
1. a CCD black and white camera; 2. a lens; 3. a coaxial light source; 4. a lens; 5. an object stage.
Detailed Description
In order to explain technical contents, achieved objects, and effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
Referring to fig. 1, a surface defect detecting apparatus includes a camera, a lens and an object stage;
the camera, the lens and the objective table are sequentially arranged in the same axial direction;
the two sides of the lens in the axial direction are planes;
the lens comprises a plurality of shading blocks which are uniformly distributed.
From the above description, the beneficial effects of the present invention are: the camera, the lens and the objective table are sequentially arranged in the same axial direction, the objective table is used for placing an object to be measured, two sides of the lens in the axial direction are planes, a plurality of shading blocks which are uniformly distributed are arranged in the lens, when the camera images, if the surface is flat, light reflected by the surface is perpendicular to the planes, the formed image is completely the same as a top-view image of the lens, if the surface has defects of depression, protrusion and the like, the light reflected into the lens from the surface cannot vertically pass through the lens, a diffuse reflection phenomenon can occur on the surface of the shading blocks, due to different light refractive indexes of the lens and air, the formed image is different from the top-view image of the lens, different places are the positions of the bulges, when the bulges and the background have the same color, the positions of the bulges can be judged through deformation of the shading blocks, so that the defect positions can be obtained through the camera, accurate detection of the bulge caused by the foreign particles is achieved.
Further, the plurality of light shielding blocks are identical.
As can be seen from the above description, the same light shielding blocks are provided, so that the size and shape of the dark portion on the top view taken by the camera are the same, which facilitates the discovery of the problem of irregular arrangement of the dark portion caused by surface defects.
Further, the shading block is a lighttight cylinder.
As can be seen from the above description, the cylinder is used as the light shielding block, and the top surface of the cylinder is circular, so that the difference from the side surface is large, which is convenient for finding the distortion phenomenon from the image, and is beneficial to efficiently finding the surface defect.
Further, the height of the light shielding block is smaller than the thickness of the lens, and the height of the light shielding block is perpendicular to the plane.
From the above description, it can be seen that the height of the light shielding block is perpendicular to the plane of the lens, and only the bottom projection of the light shielding block appears in the image obtained by the surface leveling camera, so that the distortion corresponding to the defect position can be conveniently found through comparison.
Further, the shading blocks are arranged in an array.
According to the description, the effective detection range can be enlarged to the maximum efficiency by the light shielding blocks arranged in the array, and irregular positions caused by defects are easy to find and position by the light shielding blocks arranged regularly.
Further, the distances between two adjacent light shielding blocks are equal.
As can be seen from the above description, the distances between two adjacent light shielding blocks are equal, so that the detection accuracy in different directions is the same, and the situation that some defects of a certain size that can be found at some positions cannot be found at another position is avoided.
Further, still include the camera lens, the camera lens sets up between camera and the lens.
The above description shows that the lens assists the camera in imaging, can adjust the focal length, the aperture and the like to ensure the clarity of the obtained image, and is easy for subsequent analysis and identification.
Further, still include the light source, the light source sets up between camera lens and the plane refraction prism.
As can be seen from the above description, the light source is arranged to illuminate the stage through the lens to provide sufficient brightness for the stage to facilitate exposure of the defect portion in the final image.
Further, the light source is a coaxial light source.
According to the description, the coaxial light source is arranged to emit the parallel light, so that the phenomenon that light rays are not vertical to the objective table when external irradiation light is not vertical to the plane and the diffuse reflection judgment of the surface defect part is interfered is avoided, and the accuracy of the detection result of the defect is improved.
Further, the camera is a CCD black and white camera.
According to the description, the CCD black-and-white camera is small in size, is not influenced by a magnetic field, is suitable for a complex production environment, can eliminate the interference of environmental colors to a certain extent, and improves the accuracy of a defect detection result.
The plane defect detection device is suitable for the detection environment with the requirement on surface flatness, such as the surface detection of a multilayer composite nanocrystalline finished product, and is described by the following specific embodiments:
referring to fig. 1 to fig. 3, a first embodiment of the present invention is:
a surface defect detection device comprises a camera 1, a lens 2, a light source 3, a lens 4 and an objective table 5;
the camera 1, the lens 2, the light source 3, the lens 4 and the objective table 5 are sequentially arranged in the same axial direction, namely, light rays emitted by the light source 3 irradiate an object to be measured on the objective table through the lens 4, and the camera 1 receives light rays reflected by the object to be measured on the objective table 5 through the lens 4;
the two sides of the lens on the axial direction are planes; the lens comprises a plurality of shading blocks which are uniformly distributed, the height of each shading block is smaller than the thickness of the lens, and the height of each shading block is vertical to a plane;
in an optional embodiment, the light shielding blocks are arranged in an array, and may also be arranged in other uniform arrangement modes such as a spiral arrangement mode;
referring to fig. 2 and fig. 3, in an alternative embodiment, the light shielding block is an opaque cylinder, the cylinders are arranged in an array in the lens, and the distance between two adjacent cylinders is equal, and the distance can be set according to different precision requirements;
in an alternative embodiment, the light source is a coaxial light source, and the camera is a CCD (Charge Coupled Device) black and white camera;
the working principle of the surface defect detection device in the embodiment is as follows: the coaxial light source emits coaxial light which is vertical to the plane of the lens, the light can not be refracted when passing through the two planes of the lens and vertically enters the object to be measured on the object stage below, if the surface of the object to be measured is flat, the incident light is reflected back to the lens, and the incident light is perpendicular to the plane of the lens, so that the camera can only shoot the bottom surface of the shading block in the lens when shooting, the obtained shading block image is the same as the shading block image in the top view of the lens, if the surface of the object to be measured has bulges, the light reflected by the light after being incident on the surface of the object to be measured can not be vertical to the plane of the lens, so that the light reflected by the surface of the object to be measured is reflected on the surface of the light shielding block in the lens, and finally the light is not vertical to the plane of one side of the lens close to the camera when passing out of the lens, the light rays are refracted in the lens, so that the image obtained by the camera is distorted compared with the top view of the lens;
specifically, referring to fig. 5, an included angle S1 exists between the upward light reflected by the surface of the bulge and the normal line, the light can be emitted to the surface of the cylinder and reflected to the collecting camera through the surface of the cylinder, the false appearance of inclination of the cylinder can appear after light interference synthesis, and the same applies to the concave points, so that the bulge and the concave points on the uneven surface of the material can be judged from the final imaging of the camera;
for example, referring to fig. 4, the circular portion is a schematic diagram of the bulge, and in the actual camera shooting, since the bulge is shot from the front side and the bulge is made of the same material as other portions of the background, the color of the bulge is also the same as other portions of the background, and the bulge cannot be seen.
In summary, the surface defect detecting device provided by the present invention is provided with two lenses with opposite planes, and a light shielding block is arranged in the lens, and meanwhile, light emitted by a coaxial light source passes through the lens to reach an object to be measured on the surface of an object stage, and an image received by a camera is formed after the light reflected by the surface of the object to be measured passes through the lens, if the surface is flat, since the light all passes through the two planes of the lens vertically in the whole course, the distribution of the light shielding block on the obtained image is the same as the top view of the lens, and if the surface is bulged, the light is diffusely reflected on the surface, so that the light reflected by the surface of the object to be measured is refracted after entering the lens, thereby affecting the shape of the light shielding block in the image obtained by the final camera, and it can be calculated according to the light refraction principle that the cylinders around the bulges/bulges expand outwards and the cylinders around the depressions gather inwards, the flatness of the surface of the object to be detected is obtained by detecting the deformation state of the detection cylinder, and particularly, the surface defect of the object to be detected can be efficiently found under the condition that the surface defect and the background have the same color.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to the related technical fields, are included in the scope of the present invention.
Claims (10)
1. A surface defect detection device is characterized by comprising a camera, a lens and an objective table;
the camera, the lens and the objective table are sequentially arranged in the same axial direction;
the two sides of the lens in the axial direction are planes;
the lens comprises a plurality of shading blocks which are uniformly distributed.
2. A surface defect detecting apparatus according to claim 1, wherein said plurality of said light shielding blocks are identical.
3. A surface defect detecting device as claimed in claim 1 or 2, wherein said light shielding block is a light-tight cylinder.
4. A surface defect detecting apparatus according to claim 1 or 2, wherein the height of the light shielding block is smaller than the thickness of the lens, and the height of the light shielding block is perpendicular to the plane.
5. The apparatus of claim 4, wherein the light shielding blocks are arranged in an array.
6. A surface defect detecting device according to claim 4, wherein the distance between two adjacent light shielding blocks is equal.
7. A surface defect detecting apparatus according to claim 1 or 2, further comprising a lens, said lens being disposed between said camera and said lens.
8. The apparatus of claim 6, further comprising a light source disposed between the lens and the lens.
9. A surface defect inspection apparatus as claimed in claim 6, wherein said light source is a coaxial light source.
10. A surface defect inspection apparatus as claimed in claim 1, wherein said camera is a CCD black and white camera.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121476215.2U CN216284966U (en) | 2021-06-30 | 2021-06-30 | Surface defect detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121476215.2U CN216284966U (en) | 2021-06-30 | 2021-06-30 | Surface defect detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216284966U true CN216284966U (en) | 2022-04-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121476215.2U Active CN216284966U (en) | 2021-06-30 | 2021-06-30 | Surface defect detection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216284966U (en) |
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2021
- 2021-06-30 CN CN202121476215.2U patent/CN216284966U/en active Active
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