Flatness detection method and device

Abstract

The present application provides a kind of flatness detection method and device, comprising: multiple light emitting light source;The color of the light of multiple light emitting light source is different, and from different angles to the detection surface, and meet at a point;When the light of different number of light emitting light source meets at a point, the color of the point is different accordingly.The present application utilizes the light of central light source, the light of slant light source to form light spot on the surface of the object to be detected, if different light meets at a point in the same plane, when the surface to be detected is not flat, it will lead to the light beam cannot be gathered, so as to know whether the plane to be measured exists defect by observing the light spot gathering condition (such as color, light spot distribution).

Description

Technical Field

[0001] This invention relates to non-contact flatness testing technology, specifically, to a flatness testing method and apparatus. Background Technology

[0002] For products requiring flatness, such as satellite solar panel substrates, the insulating surface (typically a polyimide film) used to attach solar cells is prone to bumps and pits. Existing inspection methods during production require physical contact with the product. For example, patent document CN113654449A describes a flatness testing mechanism for a cylinder head tester that uses a knife-edge ruler and feeler gauge for inspection.

[0003] However, contact-based flatness inspection methods may cause additional damage to the product during the inspection process and are difficult to operate and observe. Furthermore, for defects smaller than the feeler gauge's range (especially dents), the feeler gauge often cannot pass through the knife-edge ruler during inspection, meaning the defect cannot be detected. Therefore, flatness inspection in this field requires a simpler, more accurate method that is less likely to cause additional damage. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the purpose of this invention is to provide a flatness detection method and apparatus.

[0005] A flatness detection device according to the present invention includes a plurality of light emitting light sources;

[0006] The multiple light emitting sources emit light of different colors and strike the detection surface from different angles, converging at a single point;

[0007] When rays from different numbers of light-emitting sources converge at a single point, the color of that point will be different accordingly.

[0008] Preferably, the color of the emitted light from the light emitting source includes red, yellow, and blue, or includes red, green, and blue.

[0009] Preferably, the plurality of light emitting light sources includes a central light source and an oblique light source;

[0010] The central light source emits light perpendicular to the detection plane;

[0011] The tilted light source emits light rays that form an angle with the detection plane.

[0012] Preferably, it includes: a ring-shaped lamp holder and a lamp holder structure;

[0013] The central light source is located at the geometric center of the ring-shaped lamp holder;

[0014] The tilted light source is mounted on the annular structure of the annular lamp holder;

[0015] The ring-shaped lamp holder is connected to the lamp holder structure.

[0016] Preferably, the tilted light source is slidably fitted into the annular groove of the ring lamp holder via an angle adjustment mechanism.

[0017] According to the planarity detection method provided by the present invention, multiple light emitting light sources illuminate the detection plane, and the light emitting light sources form light spots on the detection plane;

[0018] The multiple light emitting sources emit light of different colors and strike the detection surface from different angles, converging at a single point;

[0019] When different numbers of light rays from an emitting light source converge at a single point, that point will have a different color.

[0020] Preferably, the color of the emitted light from the light emitting source includes red, yellow, and blue, or includes red, green, and blue;

[0021] The multiple light-emitting sources include a central light source and an inclined light source; the central light source emits light perpendicular to the detection plane; the inclined light source emits light at an angle to the detection plane.

[0022] Preferably, the flatness detection device described above is used to perform flatness detection.

[0023] Preferably, it includes:

[0024] Step S1: Adjust the height of the vertical lamp holder structure and the incident angle of the tilted light source among the multiple light emitting light sources so that the incident light from the tilted light source converges into a point on the surface being tested;

[0025] Step S2: Adjust the horizontal extension length of the lamp holder structure or move the rollers of the base of the lamp holder structure to test the flatness at different positions on the test plane;

[0026] Step S3: If all the emitted rays from the multiple light emitting sources converge at a single point, then the plane at that point is considered to have no flatness defect; if there are non-converging light spots, or if the color of the converging light spots is different from the color of the light spots formed by all the emitted rays from the multiple light emitting sources converging at a single point, then the illumination point of the central light source among the multiple light emitting sources on the detection plane is considered to have a flatness defect.

[0027] Preferably, when a flatness defect is considered to exist, the form of the defect is obtained by discretizing light spots:

[0028] If the tilted light source and the light spot of the tilted light source are on the same side relative to the incident light of the central light source, then the defect is considered to be a protrusion;

[0029] If the tilted light source and the light spot of the tilted light source are on different sides relative to the incident light of the central light source, then the defect is considered to be a pit.

[0030] The size of the defect can be determined by measuring the distance of the offset of the light spot from the tilted light source relative to the light spot of the central light source.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] 1. This invention utilizes light emitted from a central light source and an oblique light source to form light spots on the surface of the object being tested. If different light rays intersect at a point on the same plane, the light beams will not converge if the surface being tested is uneven. Therefore, by observing the convergence of the light spots (e.g., color and distribution), it can be determined whether there are defects on the surface being tested. For example, when the incident light is red, green, and blue, if the light rays converge, the light spot will be a white composite light; if the blue light rays cannot converge, the converged light will be yellow.

[0033] 2. This invention detects flatness defects as protrusions or pits by measuring the positional relationship between the tilted light source and the light spot formed on the detection surface relative to the central light source.

[0034] 3. This invention is applicable to products that require flatness, such as satellite solar panel substrates in the aerospace field. Attached Figure Description

[0035] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0036] Figure 1 This is a schematic diagram of the light results for detecting surface protrusions.

[0037] Figure 2 This is a schematic diagram of the light results used to detect the presence of pits on a surface.

[0038] Figure 3 A schematic diagram of the side angle structure constructed with a central light source and a ring light source.

[0039] Figure 4 A schematic diagram of the structure from an upward angle, constructed with a central light source and a ring light source.

[0040] Figure 5 This is a schematic diagram of the ring-shaped lamp holder slide.

[0041] Figure 6 This is a diagram of the structure of a ring-shaped light source group.

[0042] Figure 7 This is a diagram illustrating the effect of the testing device.

[0043] The diagram shows:

[0044] Detailed Implementation

[0045] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0046] The purpose of this invention is to provide a technical solution for flatness detection and to solve the technical problems in the above-mentioned technical background, making the flatness detection process simpler and the results more intuitive and accurate. Compared with existing detection methods, it can perform smaller-scale detection, and the detection equipment and the tested product do not come into contact during the process, thus avoiding additional damage.

[0047] A flatness detection device according to the present invention includes multiple light emitting light sources; the emitted light from the multiple light emitting light sources is of different colors and is incident on the detection surface from different angles, and converges at a point; when the emitted light from different numbers of light emitting light sources converges at a point, the color of that point is correspondingly different. The multiple light emitting light sources include a central light source 1 and tilted light sources.

[0048] The present invention will now be described in detail.

[0049] The central light source 1 is set at the geometric center of the ring lamp holder 3. The incident light direction of the central light source 1 is guaranteed to be perpendicular, that is, the incident light is along the vertical direction, which can be used as a mark of the inspection position.

[0050] The ring light source group 2, comprising a tilted light source, includes: a first light source 201, a second light source 202, a third light source 303, and a fourth light source 204. These light sources are arranged in the ring structure of the ring lamp holder 3 and are evenly distributed circumferentially. The emitted light rays from the ring light source group 2 are at a certain angle to the vertical direction, intersecting with the emitted light rays from the central light source 1 at a single point on the surface being tested. In a variation, the ring lamp holder 3 may have two, three, or more light sources arranged at different angles in the horizontal direction, i.e., at different positions on the ring lamp holder 3. Each light source has a different color, resulting in different colors when different incident light rays converge. The color of the surface being tested is not black, but preferably white.

[0051] A ring-shaped lamp holder 3 is provided, and a ring-shaped light source group 2 is provided on the ring-shaped lamp holder 3. The central light source 1 is fixed at the geometric center of the ring-shaped lamp holder 3.

[0052] The lighting fixture structure includes a ring-shaped light fixture 3 mounted on top of the fixture. The fixture structure comprises a horizontal light fixture 4 and a vertical light fixture 5. The horizontal light fixture 4 connects the ring-shaped light fixture 3 to the vertical light fixture 5, ensuring a horizontal orientation; the vertical light fixture 5 connects to the horizontal light fixture 4, ensuring a vertical orientation.

[0053] The present invention will now be described in more detail with reference to preferred embodiments.

[0054] The light sources in ring light group 2 are all of different colors, and the color effect produced after the light spots are mixed is also different. The presence of defects can be determined by identifying the color of the light spots, such as... Figure 1 , Figure 2 As shown. The incident angles of each light source in the ring light source group 2 can be different, but the incident rays of each light source must intersect at a point on the surface being tested, and the incident ray of the central light source 1 also passes through this point.

[0055] like Figure 5 As shown, the annular lamp holder 3 also includes a sliding groove, allowing each light source in the annular light source group 2 to slide along the groove on the horizontal plane and change position without affecting the angle of incidence between the light source and the surface being tested. This is to avoid situations where the incident light cannot reach the tested plane due to the structure of the specific product. Each light source in the annular light source group 2 has an angle adjustment mechanism, such as... Figure 6 As shown, this is used to adjust the incident angle of each light source. The direction of the light rays forms a 45-degree angle with the vertical direction.

[0056] The horizontal lamp holder 4 also includes a length adjustment mechanism for adjusting the position of the detected plane in the horizontal direction. The vertical lamp holder 5 also includes a length adjustment mechanism for adjusting the height of the annular lamp holder to accommodate different heights of the detected plane. Figure 7 As shown, the lamp holder structure also includes a base 6, and the base also includes casters 7. These are used to move the device during measurement or handling.

[0057] This invention utilizes optical principles and employs a non-contact method, avoiding additional friction and scratches to the plane caused by contact during the inspection process; and by using different colors, it is easier to identify defects in flatness and their types; the size of the defect can be obtained by measuring the offset of the light spot using the matching measuring device.

[0058] The present invention also provides a flatness detection method, based on the flatness detection device, comprising:

[0059] Step 1. Adjust the height of the vertical lamp holder and the incident angle of the ring light source so that the incident light from each light source converges into a single point on the surface being tested.

[0060] Step 2. Adjust the extension length of the horizontal lamp holder or move the rollers to check the flatness at different positions.

[0061] Step 3. If the plane is free of defects, the light rays emitted by each light source will converge at a point on the plane being inspected. Therefore, if there are non-converging light spots, it indicates that there is a defect in the flatness.

[0062] Step 4. Different colors of light produce different color effects when they converge. Therefore, if there are light rays that do not converge, the result can be easily observed through the color of the light spots.

[0063] Step 5. When flatness defects exist, the form of the defects can be obtained by discretizing light spots, such as... Figure 1 As shown, if the light spot corresponding to the ring light source is on the same side as the incident light from the central light source, then the defect is a convex shape; as... Figure 2 As shown, if the ring light source and its corresponding spot are on different sides relative to the incident light from the central light source, then the defect is a pit.

[0064] Step 6. Measure the distance of the light spot offset using the matching distance measuring device to determine the size of the defect.

[0065] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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, they should not be construed as limitations on this application.

[0066] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A flatness detection device, characterized in that, Includes multiple light-emitting sources; The multiple light emitting sources emit light of different colors and strike the detection surface from different angles, converging at a single point; When the emitted rays from different numbers of light-emitting sources converge at a single point, the color of that point will be different. If all the emitted rays from the multiple light-emitting sources converge at a single point, then the plane at that point is considered to have no flatness defect. If there are non-converging light spots, or if the color of the converging light spots is different from the color of the light spots formed by all the emitted rays from the multiple light-emitting sources converging at a single point, then the illumination point of the central light source among the multiple light-emitting sources on the detection plane is considered to have a flatness defect. Multiple light-emitting sources include a central light source and tilted light sources; The central light source emits light perpendicular to the detection plane; The tilted light source emits light rays that form an angle with the detection plane.

2. The flatness detection device according to claim 1, characterized in that, The colors of the light emitted by a light source can be red, yellow, and blue, or include red, green, and blue.

3. The flatness detection device according to claim 1, characterized in that, include: Circular lamp holder, lamp holder structure; The central light source is located at the geometric center of the ring-shaped lamp holder; The tilted light source is mounted on the annular structure of the annular lamp holder; The ring-shaped lamp holder is connected to the lamp holder structure.

4. The flatness detection device according to claim 3, characterized in that, The tilted light source slides into the annular groove of the ring lamp holder via an angle adjustment mechanism.

5. A method for detecting flatness, characterized in that, Using any one of the flatness detection devices according to claims 1 to 4, a plurality of light emitting light sources illuminate the detection plane, and the light emitting light sources form light spots on the detection plane; The multiple light emitting sources emit light of different colors and strike the detection surface from different angles, converging at a single point; When different numbers of light rays from an emitting light source converge at a single point, that point will have a different color.

6. The flatness detection method according to claim 5, characterized in that, The colors of the light emitted by a light source can be red, yellow, and blue, or include red, green, and blue. The multiple light-emitting sources include a central light source and an inclined light source; the central light source emits light perpendicular to the detection plane; the inclined light source emits light at an angle to the detection plane.

7. The flatness detection method according to claim 5, characterized in that, include: Step S1: Adjust the height of the vertical lamp holder structure and the incident angle of the tilted light source among the multiple light emitting light sources so that the incident light from the tilted light source converges into a point on the surface being tested; Step S2: Adjust the horizontal extension length of the lamp holder structure or move the rollers of the base of the lamp holder structure to test the flatness at different positions on the test plane; Step S3: If all the emitted rays from the multiple light emitting sources converge at a single point, then the plane at that point is considered to have no flatness defect; if there are non-converging light spots, or if the color of the converging light spots is different from the color of the light spots formed by all the emitted rays from the multiple light emitting sources converging at a single point, then the illumination point of the central light source among the multiple light emitting sources on the detection plane is considered to have a flatness defect.

8. The flatness detection method according to claim 7, characterized in that, When flatness defects are assumed to exist, the form of the defects is obtained through optical spot discretization: If the tilted light source and the light spot of the tilted light source are on the same side relative to the incident light of the central light source, then the defect is considered to be a protrusion; If the tilted light source and the light spot of the tilted light source are on different sides relative to the incident light of the central light source, then the defect is considered to be a pit. The size of the defect can be determined by measuring the distance of the offset of the light spot from the tilted light source relative to the light spot of the central light source.

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