Raw ceramic chip defect detection system and detection method

Abstract

The invention belongs to the technical field of defect detection, and provides a green ceramic chip defect detection system and method.The detection system comprises a parallel surface light source, a light-transmitting carrier substrate, an image acquisition module, a control module and a display screen; the light-transmitting carrier substrate is arranged above the parallel surface light source and is used for placing the green ceramic chip; the image acquisition module is arranged above the light-transmitting loading substrate and is used for acquiring a real-time light-transmitting image of the green ceramic chip; and the control module is used for receiving the real-time light-transmitting image and comparing a brightness value on the real-time light-transmitting image with a brightness value on a standard light-transmitting image so as to judge whether the green ceramic chip is qualified or not. According to the raw ceramic chip defect detection system and detection method provided by the invention, the accuracy of a detection result can be improved, and the operand of image analysis in a detection process is reduced, so that the detection efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of defect detection, and in particular to a green ceramic chip defect detection system and a detection method. Background Art

[0002] In multilayer ceramic electronic components manufactured using multilayer ceramic co-firing technology, raw ceramic sheets are key raw materials, and their quality directly affects the performance and reliability of the final product. After the production of raw ceramic sheets is completed, they are usually subject to quality control to avoid defects such as unevenness, holes, cracks or scratches, which will affect the subsequent processing and use of the ceramic sheets. The traditional inspection method is to place the product under a microscope and observe it manually, which has the problems of complex operation, high inspection intensity and low inspection efficiency.

[0003] In the prior art, the invention with publication number CN118583875A discloses a green ceramic sheet internal defect detection system, and the invention with publication number CN104677276A discloses a green ceramic sheet small hole identification detection method. The above prior art has the following problems:

[0004] 1. The light source is divergent light. The dark size formed by the divergent light passing through the raw porcelain piece does not match the actual size. The projected outline shadow has a large error, which affects the accuracy of the result.

[0005] 2. In some usage scenarios, it is necessary to cut a variety of circular raw porcelain sheets of different specifications and models from the rectangular raw porcelain sheets that are cast. When using the above-mentioned existing technology for defect detection, defect detection is performed on the entire rectangular raw porcelain sheet, which increases the amount of image analysis calculations and leads to low detection efficiency. Summary of the invention

[0006] In view of the defects in the prior art, an object of the present invention is to provide a green ceramic sheet defect detection system and detection method to solve or at least alleviate one or more of the above-mentioned technical problems or other problems existing in the prior art.

[0007] In a first aspect, the present invention provides a raw ceramic sheet defect detection system, comprising: a parallel plane light source; a light-transmitting carrier substrate, arranged above the parallel plane light source, for placing the raw ceramic sheet; an image acquisition module, arranged above the light-transmitting carrier substrate, for acquiring a real-time light-transmitting image of the raw ceramic sheet; a control module, for receiving the real-time light-transmitting image and comparing the brightness value on the real-time light-transmitting image with the brightness value on a standard light-transmitting image to determine whether the raw ceramic sheet is qualified; and a display screen, for displaying the real-time light-transmitting image and the determination result of the control module.

[0008] Furthermore, it also includes at least three first marking devices arranged between the parallel surface light source and the translucent carrier substrate, the at least three first marking devices are distributed around the circumference of the translucent carrier substrate, the first marking devices are used to generate a first optical mark on the raw porcelain sheet, and the first marking device is electrically connected to the control module; the control module is used to receive the real-time translucent image, and determine a circular detection area on the real-time translucent image based on the at least three first optical marks, and then compare the brightness value of the detection area with the brightness value on the standard translucent image to determine whether the raw porcelain sheet is qualified.

[0009] Furthermore, the first marking device includes: a first mounting seat; a first motor, which is arranged on the first mounting seat; a first mounting arm, one end of which is sleeved on the output shaft of the first motor; and a first point light source, which is arranged at the other end of the first mounting arm.

[0010] Furthermore, it also includes a second marking device arranged between the parallel surface light source and the transparent carrier substrate, the second marking device is electrically connected to the control module, the second marking device is used to generate a movable second optical mark, and the second optical mark is used to mark the center position of the detection area.

[0011] Furthermore, the second marking device includes: a second mounting seat; a second motor, which is arranged on the second mounting seat; a second mounting arm, one end of which is sleeved on the output shaft of the second motor; a third motor, which is arranged at the other end of the second mounting arm; a third mounting arm, one end of which is sleeved on the output shaft of the third motor; and a second point light source, which is arranged at the other end of the third mounting arm.

[0012] Furthermore, it also includes a box with an open top, the parallel surface light source, the first mounting seat and the second mounting seat are arranged in the box, and the light-transmitting carrier substrate is arranged at the open top of the box.

[0013] Further, the first point light source and the parallel surface light source have different colors and / or brightness, and the second point light source and the parallel surface light source have different colors and / or brightness.

[0014] In a second aspect, the present invention provides a method for detecting defects in a green ceramic sheet, comprising the following steps:

[0015] irradiating the green ceramic sheet and generating at least three first optical marks on the surface of the green ceramic sheet;

[0016] Acquire a real-time light transmission image of the green ceramic sheet, wherein the real-time light transmission image includes the at least three first optical markers;

[0017] Based on the at least three first optical markers, determining a circular detection area on the real-time light transmission image;

[0018] The brightness value of the detection area is compared with the brightness value on the standard light transmission image to determine whether the green ceramic sheet is qualified.

[0019] Furthermore, the method further comprises the following steps:

[0020] If the detection result of the green ceramic sheet is qualified, a second optical mark is generated at the center of the detection area.

[0021] Beneficial effects of the present invention:

[0022] 1. A green ceramic chip defect detection system and detection method provided by the present invention utilizes a parallel plane light source to illuminate the green ceramic chip, so that the shadow area on the back of the green ceramic chip under inspection presents high-precision size and clear edge contour contrast, thereby improving the accuracy of the detection result;

[0023] 2. The present invention provides a raw ceramic defect detection system and method, which can quickly determine the detection area by generating a first optical mark through at least three first marking devices, and then only perform comparison and analysis on the image within the detection area, thereby reducing the amount of image analysis calculations and improving detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0025] Figure 1 A three-dimensional diagram of a green ceramic chip defect detection system provided by an embodiment of the present invention;

[0026] Figure 2 for Figure 1 A three-dimensional diagram of a part of the structure;

[0027] Figure 3 for Figure 2 A three-dimensional diagram of some structures in;

[0028] Figure 4 is a schematic structural diagram of a first marking device;

[0029] Figure 5 A flow chart of a green ceramic chip defect detection method provided by one embodiment of the present invention;

[0030] Figure 6A flowchart of a green ceramic chip defect detection method provided by another embodiment of the present invention;

[0031] Figure 7 A flowchart of a green ceramic chip defect detection method provided by another embodiment of the present invention;

[0032] Reference numerals:

[0033] 10. Parallel surface light source; 11. Transparent substrate; 12. Image acquisition module; 13. Box;

[0034] 20. First marking device; 21. First mounting seat; 22. First motor; 23. First mounting arm; 24. First point light source;

[0035] 30. Second marking device; 31. Second mounting seat; 32. Second motor; 33. Second mounting arm; 34. Third motor; 35. Third mounting arm; 36. Second point light source. DETAILED DESCRIPTION

[0036] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0037] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0038] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0039] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0040] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0042] like Figure 1-4 As shown, this embodiment provides a green ceramic defect detection system, including a parallel surface light source 10, a light-transmitting carrier substrate 11, an image acquisition module 12, a control module (not shown in the drawings) and a display screen (not shown in the drawings).

[0043] The parallel surface light source 10 is used to provide a parallel surface light source, the range of which is greater than or equal to the size of the raw porcelain piece to be detected. Preferably, the parallel surface light source 10 is a high-brightness parallel surface light source 10. A light-transmitting carrier substrate 11 is arranged above the parallel surface light source 10. The light-transmitting carrier substrate 11 is used to place the raw porcelain piece. The light-transmitting carrier substrate 11 can be a glass plate. An image acquisition module 12 is arranged above the light-transmitting carrier substrate 11 and is used to collect a real-time light-transmitting image of the raw porcelain piece. The image acquisition module 12 is a camera. The control module is electrically connected to the image acquisition module 12 and is used to receive the real-time light-transmitting image and compare the brightness value on the real-time light-transmitting image with the brightness value on the standard light-transmitting image to determine whether the raw porcelain piece is qualified. The display screen is used to display the real-time light-transmitting image and the judgment result of the control module.

[0044] In this embodiment, a parallel surface light source 10 is used to illuminate the raw porcelain sheet, so that the shadow area on the back of the inspected raw porcelain sheet presents high-precision size and clear edge contour contrast, thereby improving the accuracy of the detection result. Image capture technology and optical processing technology are then used to process and screen the back optical information, thereby better screening out qualified raw porcelain sheets.

[0045] In one embodiment, at least three first marking devices 20 are further provided between the parallel plane light source 10 and the light-transmitting substrate 11, and the at least three first marking devices 20 are distributed around the circumference of the light-transmitting substrate 11. The first marking device 20 is used to generate a first optical mark on the raw ceramic sheet, and the first marking device 20 is electrically connected to the control module. The control module is used to receive the real-time light-transmitting image, and determine a circular detection area on the real-time light-transmitting image according to the at least three first optical marks, and then compare the brightness value of the detection area with the brightness value on the standard light-transmitting image to determine whether the raw ceramic sheet is qualified.

[0046] In this embodiment, the at least three first optical marks are generated under the control of the control unit, so that a circular detection area is determined by at least three first optical marks, and the imaging size of the first optical mark should be as small as possible, so that the range of the detection area will be more accurate. The size of the detection area matches the size of the circular raw porcelain piece to be cut in the subsequent process, that is, the diameter of the detection area is equal to or slightly larger than the diameter of the circular raw porcelain piece to be cut in the subsequent process. Through the above settings, the detection area can be quickly determined first, and then only the image in the detection area is compared and analyzed, thereby reducing the amount of image analysis calculations and improving detection efficiency.

[0047] In one embodiment, the first marking device 20 includes a first mounting seat 21, a first motor 22, a first mounting arm 23 and a first point light source 24. The first motor 22 is fixedly mounted on the first mounting seat 21, and the axis of the output shaft of the first motor 22 extends in the vertical direction. One end of the first mounting arm 23 is sleeved on the output shaft of the first motor 22, so that the first mounting arm 23 swings back and forth in the horizontal plane under the drive of the first motor 22. The first point light source 24 is fixedly mounted on the other end of the first mounting arm 23. The first point light source 24 can be a laser light source, which can provide a light source with high brightness and high contrast.

[0048] In this embodiment, the first marking device 20 has a simple structure and can change the position of the first point light source 24, thereby changing the imaging position of the first optical mark, so that detection areas of different sizes can be generated accordingly.

[0049] In the above-mentioned first marking device 20, under the illumination of the parallel surface light source 10, the device body (such as a shell) of the first point light source 24 and the above-mentioned other end of the first mounting arm 23 will produce a shadow around the first optical mark. Such a shadow may cause misjudgment of the defect recognition in the detection area. Therefore, it is preferred that the first point light source 24 is tilted at the above-mentioned other end of the first mounting arm 23. Specifically, the upper end of the first point light source 24 is tilted in a direction away from the above-mentioned one end of the first mounting arm 23, and the lower end is tilted in a direction close to the above-mentioned one end of the first mounting arm 23, so that the light path of the first point light source 24 is tilted upward, and finally the above-mentioned shadow does not exist around the first optical mark, thereby avoiding the interference of the above-mentioned shadow on the recognition of defects in the detection area.

[0050] In one embodiment, it also includes a second marking device 30 disposed between the parallel plane light source 10 and the light-transmitting substrate 11, the second marking device 30 is electrically connected to the control module, and the second marking device 30 is used to generate a movable second optical mark, and the second optical mark is used to mark the center position of the detection area. Specifically, after the control module compares the brightness value of the detection area with the brightness value on the standard light-transmitting image, if the raw ceramic sheet is judged to be qualified, the control module controls the second marking device 30 to work, so that the second marking device 30 generates a second optical mark at the center position of the detection area, and then the worker can make a mark on the upper surface of the raw ceramic sheet with a marker pen according to the indication of the second optical mark, so as to cut out a circular raw ceramic sheet according to the marked center position in the subsequent process. Of course, the worker can also make a mark on the upper surface of the raw ceramic sheet with a marker pen according to the indication of the first optical mark, and in the subsequent process, according to these three marks, combined with the marked center position, the entire circular area to be cut can be more accurately determined.

[0051] In one embodiment, the second marking device 30 includes a second mounting seat 31, a second motor 32, a second mounting arm 33, a third motor 34, a third mounting arm 35 and a second point light source 36. The second motor 32 is fixedly mounted on the second mounting seat 31, the output shaft of the second motor 32 extends in the vertical direction, one end of the second mounting arm 33 is sleeved on the output shaft of the second motor 32, the other end of the second mounting arm 33 is mounted with the third motor 34, the output shaft of the third motor 34 extends in the vertical direction, one end of the third mounting arm 35 is sleeved on the output shaft of the third motor 34, the other end of the third mounting arm 35 is provided with a second point light source 36, the second point light source 36 can be the same laser light source as the first point light source 24, of course, the color of the second point light source 36 can be different from that of the first point light source 24.

[0052] In this embodiment, the second mounting arm 33 is driven to swing by the second motor 32, and the third mounting arm 35 is driven to swing by the third motor 34, so as to realize the movement of the second point light source 36, and the above-mentioned second marking device 30 has a large moving range. When there is no need to generate the second optical mark, the second point light source 36, the third mounting arm 35, the third motor 34, the second mounting arm 33 and the second motor 32 are all located outside the irradiation range of the parallel surface light source 10, which will not interfere with the defect detection of the raw ceramic sheet.

[0053] Preferably, the number of the first marking devices 20 is three, and the three first marking devices 20 and the second marking devices 30 are evenly distributed around the circumference of the light-transmitting carrier substrate 11, that is, the angle between adjacent ones is 90°.

[0054] In one embodiment, a box 13 with an open top is further included, wherein the parallel surface light source 10, the first mounting seat 21 and the second mounting seat 31 are arranged in the box 13, and the light-transmitting carrier substrate 11 is arranged at the open top of the box 13. The box 13 can prevent the parallel surface light source 10 from leaking light, and also provide a basis for the installation and fixation of the first mounting seat 21 and the second mounting seat 31.

[0055] In one embodiment, the color and / or brightness of the first point light source 24 is different from that of the parallel surface light source 10, and the color and / or brightness of the second point light source 36 is different from that of the parallel surface light source 10. The color or brightness of the first point light source 24 and the second point light source 36 may be the same or different. Through the above arrangement, it is convenient for the control module to identify the first optical mark and the second optical mark.

[0056] like Figure 5 As shown, this embodiment provides a green ceramic sheet defect detection method, which is implemented based on the green ceramic sheet defect detection system, and includes the following steps:

[0057] S101, irradiating the green ceramic sheet and generating at least three first optical marks on the surface of the green ceramic sheet;

[0058] S102, obtaining a real-time light transmission image of the green ceramic sheet, wherein the real-time light transmission image includes at least three first optical markers;

[0059] S103, determining a circular detection area on the real-time light transmission image based on the at least three first optical markers;

[0060] S104, comparing the brightness value of the detection area with the brightness value on the standard light transmission image to determine whether the green ceramic sheet is qualified.

[0061] In one embodiment, Figure 6 As shown, after step S104, the following steps are also included:

[0062] S105: If the detection result of the green ceramic sheet is qualified, a second optical mark is generated at the center of the detection area.

[0063] In one embodiment, Figure 7 As shown, after step S104, the following steps are also included:

[0064] S106. If the inspection result of the raw porcelain sheet is unqualified, determine whether there is a circular area to be cut that does not contain defects on the entire real-time light transmission image of the raw porcelain sheet. If so, generate at least three third optical marks and one fourth optical mark, wherein the at least three third optical marks are used to indicate the edges of the area to be cut, and the fourth optical mark is used to indicate the center of the area to be cut. If not, the final inspection result of the raw porcelain sheet is determined to be unqualified.

[0065] In the above-mentioned embodiment, the center of the detection area and the center area of ​​the raw porcelain sheet are usually overlapped, so that the first optical mark and the second optical mark are easier to confirm. However, if there are defects in the detection area determined based on this rule, that is, the detection result of the raw porcelain sheet is unqualified, then in this embodiment, the control module analyzes the entire real-time light transmission image of the raw porcelain sheet, that is, determines whether there is a circular area to be cut that does not contain defects on the entire real-time light transmission image of the raw porcelain sheet. Among them, the size of the area to be cut can be the size that the raw porcelain sheets of this batch need to be processed in the subsequent process, or it can be a size smaller than the size to be processed in this batch, as long as the size meets the size requirements of other batches of raw porcelain sheets in the subsequent processing. For example, the specifications of the circular raw porcelain sheets to be cut are 320mm, 310mm, 300mm, 290mm and 280mm. In a certain detection, the diameter of the detection area is 300mm, then the diameter of the area to be cut re-determined can be 300mm, or it can be 290mm or 280mm. If there is an area to be cut that meets the requirements, a third optical mark is generated by the first marking device 20, and a fourth optical mark is generated by the second marking device 30. The worker makes corresponding marks on the raw porcelain sheet according to the indications of the third and fourth optical marks to facilitate the subsequent clarification of the cutting range.

[0066] In this embodiment, when the inspection result of the inspection area on the raw porcelain sheet is unqualified, other areas are searched on the raw porcelain sheet. If there is an area that meets the requirements, the raw porcelain sheet is still qualified. This can reduce the number of defective raw porcelain sheets and reduce the company's production and processing costs.

[0067] In the description of the present invention, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A green ceramic chip defect detection system, characterized in that: include: Parallel surface light source(10); A light-transmitting carrier substrate (11) is arranged above the parallel surface light source (10) and is used for placing the green ceramic sheet; An image acquisition module (12) is arranged above the light-transmitting carrier substrate (11) and is used to acquire a real-time light-transmitting image of the green ceramic sheet; A control module, configured to receive the real-time light transmission image and compare the brightness value on the real-time light transmission image with the brightness value on the standard light transmission image to determine whether the green ceramic sheet is qualified; as well as A display screen is used to display the real-time light transmission image and the judgment result of the control module.

2. The green ceramic sheet defect detection system according to claim 1, characterized in that: It also includes at least three first marking devices (20) arranged between the parallel surface light source (10) and the light-transmitting carrier substrate (11), the at least three first marking devices (20) being distributed around the circumference of the light-transmitting carrier substrate (11), the first marking devices (20) being used to generate a first optical mark on the green ceramic sheet, and the first marking devices (20) being electrically connected to the control module; The control module is used to receive the real-time light transmission image, and determine a circular detection area on the real-time light transmission image based on the at least three first optical marks, and then compare the brightness value of the detection area with the brightness value on the standard light transmission image to determine whether the raw ceramic sheet is qualified.

3. The green ceramic sheet defect detection system according to claim 2, characterized in that: The first marking device (20) comprises: A first mounting seat (21); A first motor (22) is arranged on the first mounting seat (21); A first mounting arm (23), one end of which is sleeved on the output shaft of the first motor (22); and A first point light source (24) is arranged at the other end of the first mounting arm (23).

4. The green ceramic sheet defect detection system according to claim 3, characterized in that: It also includes a second marking device (30) arranged between the parallel surface light source (10) and the light-transmitting carrier substrate (11), the second marking device (30) being electrically connected to the control module, the second marking device (30) being used to generate a movable second optical mark, the second optical mark being used to mark the center position of the detection area.

5. The green ceramic sheet defect detection system according to claim 4, characterized in that: The second marking device (30) comprises: A second mounting seat (31); A second motor (32) is arranged on the second mounting seat (31); A second mounting arm (33), one end of which is sleeved on the output shaft of the second motor (32); a third motor (34), arranged at the other end of the second mounting arm (33); A third mounting arm (35), one end of which is sleeved on the output shaft of the third motor (34); and The second point light source (36) is arranged at the other end of the third mounting arm (35).

6. The green ceramic sheet defect detection system according to claim 5, characterized in that: It also comprises a box body (13) with an open top, wherein the parallel surface light source (10), the first mounting seat (21) and the second mounting seat (31) are arranged in the box body (13), and the light-transmitting carrier substrate (11) is arranged at the open top of the box body (13).

7. The green ceramic sheet defect detection system according to claim 5, characterized in that: The first point light source (24) has a different color and / or brightness from the parallel surface light source (10), and the second point light source (36) has a different color and / or brightness from the parallel surface light source (10).

8. A method for detecting defects in green ceramic sheets, characterized in that: The steps include: irradiating the green ceramic sheet and generating at least three first optical marks on the surface of the green ceramic sheet; Acquire a real-time light transmission image of the green ceramic sheet, wherein the real-time light transmission image includes the at least three first optical markers; Based on the at least three first optical markers, determining a circular detection area on the real-time light transmission image; The brightness value of the detection area is compared with the brightness value on the standard light transmission image to determine whether the green ceramic sheet is qualified.

9. The green ceramic sheet defect detection method according to claim 8, characterized in that: The following steps are also included: If the detection result of the green ceramic sheet is qualified, a second optical mark is generated at the center of the detection area.

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