A ceramic capacitor detection method and system based on visual nerve

Abstract

The present application discloses a ceramic capacitor detection method and system based on visual nerves. By innovatively designing a transparent test cover and its internal component layout, efficient and comprehensive detection of surface gaps of multilayer ceramic capacitors is achieved. The system utilizes the principle of wedge-point interference fringes and a multi-angle backlight illumination strategy, which not only improves the detection accuracy, but also significantly improves the detection efficiency. Specifically, the specific angle setting of the transparent test cover and the capacitor to be tested, combined with the first detection component, ensures the effective capture of the top surface gap; and the ingenious configuration of the multi-zone backlight panel and the light-transmitting test board makes the gaps on the sides of the capacitor nowhere to hide. In addition, the image analysis capability of the processor further enhances the intelligent level of detection and reduces the need for manual intervention, thereby effectively reducing the product defect rate and improving the overall quality control capability of the production line, which is of great significance for meeting the needs of large-scale production.

Description

Technical Field

[0001] The present application relates to the field of detection technology, and in particular to a ceramic capacitor detection method and system based on visual nerves. Background Art

[0002] As an indispensable passive component in modern electronic devices, multilayer ceramic capacitors (MLCC) are widely used in communication equipment, computer boards, home appliances, automotive electronics and other fields due to their high capacitance, small size, high stability and low distortion. MLCC is made of multiple layers of ceramic dielectrics and metal electrodes stacked alternately. Its surface gaps are common manufacturing defects that directly affect the electrical performance and long-term reliability of the capacitor, and may even cause serious problems such as short circuits and leakage. Therefore, accurate detection of MLCC surface gaps is particularly important.

[0003] Since the gaps may be tiny and hidden, it is difficult to ensure the comprehensiveness and accuracy of the inspection by manual or ordinary visual inspection equipment alone, which increases the risk of product defective rate. Therefore, at present, the inspection of surface gaps of multilayer ceramic capacitors mostly adopts visual inspection. Although this method is intuitive, it has significant defects. Especially for rectangular MLCCs, traditional visual inspection requires checking each surface one by one. The inspection process is cumbersome and inefficient, and it is difficult to meet the rapid inspection needs of large-scale production lines. Summary of the invention

[0004] The purpose of this application is to provide a ceramic capacitor detection method and system based on visual nerves, which can improve the above-mentioned problems.

[0005] The embodiment of the present application is implemented as follows:

[0006] In a first aspect, the present application provides a ceramic capacitor detection system based on visual nerves, comprising:

[0007] A transparent test cover, used to cover the rectangular body of the capacitor to be tested through the opening, wherein the top surface of the transparent test cover is at a first preset angle relative to the top surface of the rectangular body of the capacitor to be tested;

[0008] A first detection component is used to emit a detection beam to the top surface to be detected and capture a first detection picture of the wedge-shaped interference fringes occurring on the top surface;

[0009] At least two backlight panels are fixed to different areas on the side of the transparent test cover and both emit light toward the inside of the transparent test cover, and each backlight panel emits light in a different direction;

[0010] At least four light-transmitting test panels are arranged in the transparent test cover;

[0011] At least two positioning members are fixed on the inner wall of the side surface, and are used to guide the transparent test cover to cover the rectangular body of the capacitor to be tested in a preset posture, so that each test side surface of the rectangular body of the capacitor to be tested can be illuminated by the corresponding backlight panel, and each test side surface is arranged at a second preset angle with the corresponding light-transmitting test plate;

[0012] At least two external cameras, disposed outside the transparent test cover, for capturing a second detection picture of each test side;

[0013] A processor is connected to the first detection component and the external camera, and is used to perform image analysis on the first detection picture and the second detection picture obtained to determine whether there is a gap in the rectangular body of the capacitor to be tested.

[0014] It can be understood that the present application discloses a ceramic capacitor detection system based on visual nerves, which realizes efficient and comprehensive detection of surface gaps of multilayer ceramic capacitors (MLCCs) by innovatively designing a transparent test cover and its internal component layout. The system utilizes the principle of wedge-point interference fringes and a multi-angle backlight illumination strategy, which not only improves the detection accuracy, but also significantly improves the detection efficiency. Specifically, the specific angle setting of the transparent test cover and the capacitor to be tested, combined with the first detection component, ensures the effective capture of the top surface gap; and the ingenious configuration of the multi-zone backlight panel and the light-transmitting test board makes the gaps on the sides of the capacitor nowhere to hide. In addition, the image analysis capability of the processor further enhances the intelligence level of detection and reduces the need for manual intervention, thereby effectively reducing the product defect rate and improving the overall quality control capability of the production line, which is of great significance for meeting the needs of large-scale production.

[0015] In an optional embodiment of the present application, the first detection component includes a light source component and a top camera; the light beam emitted by the light source component is irradiated onto the top surface to be measured of the rectangular body of the capacitor to be measured through the top surface of the transparent test cover, the surface of the top surface close to the top surface to be measured is the first surface, the reflected light of the first surface interferes with the reflected light of the top surface to be measured, and sharp interference fringes are formed on the first surface; the top camera is used to shoot the sharp interference fringes to obtain a first detection screen.

[0016] The direct configuration of the light source assembly and the top camera can effectively capture the wedge-shaped interference fringes formed by the interference of the top surface to be tested and the reflected light of the first surface, thereby quickly acquiring the test image. This direct shooting method makes the system construction and operation relatively simple, which is very suitable for scenarios that require rapid detection and have certain cost requirements.

[0017] In an optional embodiment of the present application, the first detection component also includes a polarizer, a polarizing reflector and a quarter-wave plate arranged between the light source component and the rectangular body of the capacitor to be tested; the polarizer is used to transmit a light beam in a first polarization direction, and the polarizing reflector is used to transmit a light beam in the first polarization direction and reflect light beams in other polarization directions; the light beam emitted by the light source component outputs a first polarized light beam after passing through the polarizer, the first polarized light beam passes through the polarizing reflector and the quarter-wave plate, and irradiates the top surface to be tested of the rectangular body of the capacitor to be tested, the light beam with the cleaved interference fringes on the first surface is converted into a second polarized light beam in a second polarization direction after passing through the quarter-wave plate again, and the second polarized light beam is reflected to the top camera through the polarizing reflector, so that the top camera captures the cleaved interference fringes to obtain a first detection screen.

[0018] It can be understood that by introducing optical elements such as polarizers, polarizing reflectors and quarter-wave plates, the polarization state of the light beam can be effectively controlled, stray light interference can be reduced, and the top camera can capture the wedge-shaped interference fringes more clearly. In addition, the addition of the above elements can adjust the light path of the light beam, making the light path more compact.

[0019] In an optional embodiment of the present application, the light source assembly includes at least one of the following:

[0020] A laser and a beam shaping device, wherein the beam shaping device is used to shape the output beam of the laser into a light spot that matches the shape of the top surface to be measured;

[0021] Backlit panel.

[0022] In an optional embodiment of the present application, the transparent test cover includes a first side surface, a second side surface, a third side surface and a fourth side surface connected in sequence, and a top surface connected to each side surface; a first backlight panel is fixed to the second side surface, and a second backlight panel is fixed to the fourth side surface; a first clamping piece is arranged on the inner wall of the first side surface, and a second clamping piece is arranged on the inner wall of the third side surface, and under the guidance of the first clamping piece and the second clamping piece, each test side surface of the rectangular body of the capacitor to be tested is set between two adjacent sides of the transparent test cover, and the output light of the first backlight panel can illuminate the first test side surface and the second test side surface of the rectangular body of the capacitor to be tested, and the output light of the second backlight panel can illuminate the third test side surface and the fourth test side surface of the rectangular body of the capacitor to be tested; a first camera is arranged relative to the first side surface, and is used to shoot a second detection picture of the first test side surface and the second test side surface, and a second camera is arranged relative to the third side surface, and is used to shoot a second detection picture of the third test side surface and the fourth test side surface.

[0023] In an optional embodiment of the present application, under the guidance of the first clamping member and the second clamping member, the first test side surface of the rectangular body of the capacitor to be tested forms a 45° angle with the first side surface and the second side surface on both sides, the second test side surface forms a 45° angle with the second side surface and the third side surface on both sides, the third test side surface forms a 45° angle with the third side surface and the fourth side surface on both sides, and the fourth test side surface forms a 45° angle with the fourth side surface and the first side surface on both sides; the first backlight panel emits light directly facing the second side surface, and the second backlight panel emits light directly facing the fourth side surface.

[0024] In an optional embodiment of the present application, a first light transmittance test plate is arranged between the first side surface and the second side surface, the angle between the first light transmittance test plate and the first side surface is greater than 45°, and the angle between the first light transmittance test plate and the second side surface is less than 45°; a second light transmittance test plate is arranged between the second side surface and the third side surface, the angle between the second light transmittance test plate and the second side surface is less than 45°, and the angle between the second light transmittance test plate and the third side surface is greater than 45°; a third light transmittance test plate is arranged between the third side surface and the fourth side surface, the angle between the third light transmittance test plate and the third side surface is greater than 45°, and the angle between the third light transmittance test plate and the fourth side surface is less than 45°; a fourth light transmittance test plate is arranged between the fourth side surface and the first side surface, the angle between the fourth light transmittance test plate and the fourth side surface is less than 45°, and the angle between the fourth light transmittance test plate and the first side surface is greater than 45°.

[0025] In an optional embodiment of the present application, the backlight panel includes a circuit backplane, an LED array, a light blocking layer, and a microlens array; wherein,

[0026] A circuit backplane, comprising a substrate, a driving circuit layer and a flat layer which are stacked, wherein a first contact pad and a second contact pad connected to the driving circuit layer are arranged on the flat layer;

[0027] An LED array, wherein the positive electrode of each LED is welded to the first contact pad, and the negative electrode of the LED is welded to the second contact pad;

[0028] A light blocking layer, covering the circuit back plate and filling between two adjacent LEDs;

[0029] A microlens array, each microlens covers at least one corresponding LED, and is used to narrow the angle of the output light beam of the LED within a preset angle range.

[0030] It can be understood that the design of the above-mentioned backlight panel structure has significant advantages, especially the excellent collimation effect of the light beam, which effectively reduces the loss of the light beam irradiated on the rectangular body of the capacitor to be measured. By introducing a microlens array, each microlens is covered on the corresponding at least one LED, and the angle of the LED's outgoing light beam can be accurately gathered within a preset angle range, thereby achieving efficient collimation of the light beam. This design not only improves the utilization rate of the light beam, but also ensures that the light beam irradiated on the rectangular body of the capacitor to be measured is more uniform and concentrated, which helps to improve the accuracy and stability of the detection. In addition, the setting of the light blocking layer effectively fills the gap between two adjacent LEDs, further reducing the scattering and loss of the light beam, making the light beam output of the entire backlight panel more efficient and reliable.

[0031] In an optional embodiment of the present application, the difference between the refractive index of the light-transmitting test plate and the refractive index of the rectangular body of the capacitor to be tested is less than a preset difference.

[0032] It is understandable that the refractive index of the light-transmitting test plate is as close as possible to or directly equal to the refractive index of the capacitor rectangle to be tested. The material of the light-transmitting test plate can use the same material as the capacitor rectangle to be tested, in which case the refractive indexes of the two are naturally the same or similar; of course, other materials that are different from the capacitor rectangle to be tested but have the same refractive index can also be used, and other materials are not limited in this embodiment. Selecting a light-transmitting test plate with the same refractive index as the capacitor rectangle to be tested makes the position where the interference fringes are formed in the detection picture taken by the camera have a higher overlap rate with the test surface of the capacitor rectangle to be tested. In this case, the position of the gap defect can be more accurately determined by image analysis of the detection picture.

[0033] In the second aspect, the present application provides a ceramic capacitor detection method based on visual nerves, which is applied to the ceramic capacitor detection system based on visual nerves as described in any one of the first aspects, including steps S1 to S4, wherein S1, S2, etc. are only step identifiers, and the execution order of the method is not necessarily in the order of numbers from small to large, for example, step S2 may be executed first and then step S1, and the present application does not impose any restrictions.

[0034] S1: Turn on the light source component of the first detection component and each of the backlight panels;

[0035] S2: Acquire a first detection picture captured by the first detection component and a second detection picture captured by each of the external cameras;

[0036] S3: Identify the wedge-shaped interference fringes in the first detection image, and determine the position where the absolute value of the difference between the fringes width and the first preset fringes width is greater than a preset threshold as the gap position of the top surface to be tested;

[0037] S4: Identify the wedge-shaped interference fringes in the second detection image, and determine the position where the absolute value of the difference between the fringes width and the second preset fringes width is greater than a preset threshold as the gap position of the test side.

[0038] It can be understood that the visual nerve-based ceramic capacitor detection method provided by the present application realizes multi-dimensional and high-precision detection of the surface gaps of ceramic capacitors by comprehensively using the first detection component and the light source of multiple backlight panels. This method not only captures the first detection picture of the top surface of the capacitor, but also obtains the second detection picture of each side, thereby ensuring the comprehensiveness and accuracy of the detection. By identifying the sharp interference fringes in the detection picture and comparing them with the preset fringing width, the gap position can be accurately located, significantly improving the detection efficiency and reliability. In summary, the method of the present application effectively solves the cumbersome and inefficient problems of traditional visual detection methods, and provides a new solution for the rapid detection of ceramic capacitors on large-scale production lines, which helps to reduce product defective rates and improve the overall quality control level.

[0039] In an optional embodiment of the present application, the first preset stripe width is calculated by the following formula: ,in, represents the first preset stripe width, represents the wavelength of the light source of the first detection component, represents the refractive index of the air between the top surface of the transparent test cover and the rectangular body of the capacitor to be tested, represents the first preset angle;

[0040] The second preset stripe width is calculated by the following formula: ,in, represents the second preset stripe width, represents the emission wavelength of each of the backlight panels, represents the refractive index of the air between the light-transmitting test plate and the rectangular body of the capacitor to be tested, represents the second preset angle.

[0041] Beneficial effects:

[0042] The present application discloses a ceramic capacitor detection system based on visual nerves. By innovatively designing a transparent test cover and its internal component layout, efficient and comprehensive detection of surface gaps of multilayer ceramic capacitors (MLCCs) is achieved. The system utilizes the principle of wedge-point interference fringes and a multi-angle backlight illumination strategy, which not only improves the detection accuracy, but also significantly improves the detection efficiency. Specifically, the specific angle setting of the transparent test cover and the capacitor to be tested, combined with the first detection component, ensures the effective capture of the top surface gap; and the ingenious configuration of the multi-zone backlight panel and the light-transmitting test board makes the gaps on the sides of the capacitor nowhere to hide. In addition, the image analysis capability of the processor further enhances the intelligence level of detection and reduces the need for manual intervention, thereby effectively reducing the product defect rate and improving the overall quality control capability of the production line, which is of great significance for meeting the needs of large-scale production.

[0043] The ceramic capacitor detection method based on visual nerves provided by the present application realizes multi-dimensional and high-precision detection of the surface gaps of ceramic capacitors by comprehensively using the first detection component and the light source of multiple backlight panels. This method not only captures the first detection picture of the top surface of the capacitor, but also obtains the second detection picture of each side, thereby ensuring the comprehensiveness and accuracy of the detection. By identifying the sharp interference fringes in the detection picture and comparing them with the preset fringing width, the gap position can be accurately located, significantly improving the detection efficiency and reliability. In summary, the method of the present application effectively solves the cumbersome and inefficient problems of traditional visual detection methods, provides a new solution for the rapid detection of ceramic capacitors on large-scale production lines, helps to reduce product defective rates, and improves the overall quality control level.

[0044] In order to make the above-mentioned objects, features and advantages of the present application more obvious and understandable, optional embodiments are specifically listed below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0046] Figure 1 It is a structural schematic diagram of a ceramic capacitor detection system based on visual nerve provided by the present application;

[0047] Figure 2 yes Figure 1 A bottom view of the visual nerve-based ceramic capacitor detection system shown;

[0048] Figure 3 yes Figure 1 The dashed cross-sectional view of the ceramic capacitor detection method and system based on visual nerve is shown;

[0049] Figure 4 It is a structural schematic diagram of a backlight panel provided in this application. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0051] In a first aspect, the present application provides a ceramic capacitor detection system based on visual nerves, which includes: a transparent test cover, a first detection component, at least two backlight panels, at least four light-transmitting test boards, at least two positioning members, at least two external cameras and a processor (not shown in the figure).

[0052] The transparent test cover is used to cover the rectangular body of the capacitor to be tested through the opening, and the top surface of the transparent test cover is at a first preset angle relative to the top surface of the rectangular body of the capacitor to be tested. Figure 1 and 3 In the ceramic capacitor detection system shown in the figure, the transparent test cover 10 covers the rectangular body 100 of the capacitor to be tested, and the top surface 11 of the transparent test cover 10 and the top surface 101 of the rectangular body 100 of the capacitor to be tested are at a first preset angle. .

[0053] The first detection component is used to emit a detection light beam to the top surface to be detected and to capture a first detection image of the wedge-shaped interference fringes occurring on the top surface.

[0054] In an optional embodiment of the present application, the first detection component includes a light source component and a top camera 22; the light beam emitted by the light source component is irradiated to the top surface to be measured of the rectangular body of the capacitor to be measured through the top surface of the transparent test cover, the surface of the top surface close to the top surface to be measured is the first surface, and the reflected light of the first surface interferes with the reflected light of the top surface to be measured, forming a wedge-shaped interference fringe on the first surface; the top camera 22 is used to shoot the wedge-shaped interference fringe to obtain a first detection picture. It can be immediately, through the direct configuration of the light source component and the top camera 22, the wedge-shaped interference fringe formed by the interference of the top surface to be measured and the reflected light of the first surface can be efficiently captured, so as to quickly obtain the detection picture. This direct shooting method makes the system construction and operation relatively simple, which is very suitable for scenes that require rapid detection and have certain requirements on cost.

[0055] In an optional embodiment of the present application, Figure 1 and Figure 3 As shown, in addition to the light source component 21 and the top camera 22, the first detection component 20 also includes a polarizer 23, a polarizing reflector 24 and a quarter-wave plate 25 arranged between the light source component 21 and the capacitor rectangular body 100 to be tested; the polarizer 23 is used to transmit the light beam in the first polarization direction, and the polarizing reflector 24 is used to transmit the light beam in the first polarization direction and reflect the light beams in other polarization directions; the light beam emitted by the light source component 21 outputs a first polarized light beam after passing through the polarizer 23, the first polarized light beam passes through the polarizing reflector 24 and the quarter-wave plate 25, and irradiates the top surface to be tested of the capacitor rectangular body 100 to be tested, the light beam with the cleaved interference fringes on the first surface is converted into a second polarized light beam in the second polarization direction after passing through the quarter-wave plate 25 again, and the second polarized light beam is reflected to the top camera 22 through the polarizing reflector 24, so that the top camera 22 captures the cleaved interference fringes to obtain a first detection screen. It can be understood that by introducing optical elements such as the polarizer 23, the polarizing reflector 24 and the quarter wave plate 25, the polarization state of the light beam can be effectively controlled, the stray light interference can be reduced, and the top camera 22 can capture the wedge-shaped interference fringes more clearly. In addition, the addition of the above elements can adjust the light path of the light beam, making the light path more compact.

[0056] In an optional embodiment of the present application, the light source assembly 21 includes at least one of the following: a laser and a beam shaping device, the beam shaping device being used to shape the output beam of the laser into a light spot matching the shape of the top surface to be measured; and a backlight panel.

[0057] The at least two backlight panels are fixed to different areas on the side of the transparent test cover and emit light toward the inside of the transparent test cover. The light emitting direction of each backlight panel is different.

[0058] The at least two locking members are fixed on the inner wall of the side surface, and are used to guide the transparent test cover 10 to cover the rectangular body of the capacitor to be tested in a preset posture, so that each test side surface of the rectangular body of the capacitor to be tested can be illuminated by the corresponding backlight panel, and each test side surface is set at a second preset angle with the corresponding transparent test board.

[0059] The at least four light-transmitting test panels are arranged in a transparent test cover.

[0060] The at least two external cameras are arranged outside the transparent test cover 10 and are used to capture the second detection picture of each test side.

[0061] In an optional embodiment of the present application, Figure 2As shown, the transparent test cover 10 includes a first side surface 12, a second side surface 13, a third side surface 14 and a fourth side surface 15 connected in sequence, and a top surface 11 connected to each side surface; a first backlight panel 31 is fixed to the second side surface 13, and a second backlight panel 32 is fixed to the fourth side surface 15; a first clamping member 41 is arranged on the inner wall of the first side surface 12, and a second clamping member 42 is arranged on the inner wall of the third side surface 14. Under the guidance of the first clamping member 41 and the second clamping member 42, each test side surface of the capacitor rectangular body 100 to be tested is set on two adjacent side surfaces of the transparent test cover 10. The output light of the first backlight panel 31 can illuminate the first test side 102 and the second test side 103 of the rectangular body of the capacitor to be tested, and the output light of the second backlight panel 32 can illuminate the third test side 104 and the fourth test side 105 of the rectangular body of the capacitor to be tested; the first camera 51 is arranged relative to the first side 12, and is used to shoot the second test screen of the first test side 102 and the second test side 103, and the second camera 52 is arranged relative to the third side 14, and is used to shoot the second test screen of the third test side 104 and the fourth test side 105.

[0062] In an optional embodiment of the present application, under the guidance of the first retaining member 41 and the second retaining member 42, the first test side 102 of the capacitor rectangular body 100 to be tested forms a 45° angle with the first side 12 and the second side 13 on both sides, the second test side 103 forms a 45° angle with the second side 13 and the third side 14 on both sides, the third test side 104 forms a 45° angle with the third side 14 and the fourth side 15 on both sides, and the fourth test side 105 forms a 45° angle with the fourth side 15 and the first side 12 on both sides; the first backlight panel 31 emits light facing the second side 13, and the second backlight panel 32 emits light facing the fourth side 15.

[0063] In an optional embodiment of the present application, a first light transmittance test plate 61 is arranged between the first side surface 12 and the second side surface 13, the angle between the first light transmittance test plate 61 and the first side surface 12 is greater than 45°, and the angle between the first light transmittance test plate 61 and the second side surface 13 is less than 45°; a second light transmittance test plate 62 is arranged between the second side surface 13 and the third side surface 14, the angle between the second light transmittance test plate 62 and the second side surface 13 is less than 45°, and the angle between the second light transmittance test plate 62 and the third side surface 14 is greater than 45°; a third light transmittance test plate 63 is arranged between the third side surface 14 and the fourth side surface 15, the angle between the third light transmittance test plate 63 and the third side surface 14 is greater than 45°, and the angle between the third light transmittance test plate 63 and the fourth side surface 15 is less than 45°; a fourth light transmittance test plate 64 is arranged between the fourth side surface 15 and the first side surface 12, the angle between the fourth light transmittance test plate 64 and the fourth side surface 15 is less than 45°, and the angle between the fourth light transmittance test plate 64 and the first side surface 12 is greater than 45°.

[0064] The processor is connected to the first detection component and the external camera, and is used to perform image analysis on the acquired first detection picture and the second detection picture to determine whether there is a gap in the rectangular body of the capacitor to be tested.

[0065] It should be understood that in the embodiments of the present invention, the processor referred to may be a central processing unit (CPU), and the processor may also be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0066] It can be understood that the present application discloses a ceramic capacitor detection system based on visual nerves, which realizes efficient and comprehensive detection of surface gaps of multilayer ceramic capacitors (MLCCs) by innovatively designing a transparent test cover and its internal component layout. The system utilizes the principle of wedge-point interference fringes and a multi-angle backlight illumination strategy, which not only improves the detection accuracy, but also significantly improves the detection efficiency. Specifically, the specific angle setting of the transparent test cover and the capacitor to be tested, combined with the first detection component, ensures the effective capture of the top surface gap; and the ingenious configuration of the multi-zone backlight panel and the light-transmitting test board makes the gaps on the sides of the capacitor nowhere to hide. In addition, the image analysis capability of the processor further enhances the intelligence level of detection and reduces the need for manual intervention, thereby effectively reducing the product defect rate and improving the overall quality control capability of the production line, which is of great significance for meeting the needs of large-scale production.

[0067] In an optional embodiment of the present application, the first backlight panel 31, the second backlight panel 32 and the backlight panel in the first detection component can all adopt the same backlight panel structure, such as Figure 4As shown, the circuit backplane 71, the LED array, the light-blocking layer 74, and the microlens array. The circuit backplane 71 includes a stacked substrate 711, a driving circuit layer 712, and a flat layer 713, on which the first touch pad and the second touch pad connected to the driving circuit layer 712 are arranged; in the LED array, the positive electrode of each LED 72 is welded on the first touch pad, and the negative electrode of the LED 72 is welded on the second touch pad; the light-blocking layer 74 covers the circuit backplane 71 and fills between two adjacent LEDs 72; in the microlens array, each microlens 73 covers at least one corresponding LED 72, and is used to gather the angle of the emitted light beam of the LED 72 within a preset angle range.

[0068] It can be understood that the design of the above-mentioned backlight panel structure has significant advantages, especially the excellent collimation effect of the light beam, which effectively reduces the loss of the light beam irradiated on the rectangular body of the capacitor to be measured. By introducing a microlens array, each microlens is covered on the corresponding at least one LED, and the angle of the LED's outgoing light beam can be accurately gathered within a preset angle range, thereby achieving efficient collimation of the light beam. This design not only improves the utilization rate of the light beam, but also ensures that the light beam irradiated on the rectangular body of the capacitor to be measured is more uniform and concentrated, which helps to improve the accuracy and stability of the detection. In addition, the setting of the light blocking layer 74 effectively fills the gap between two adjacent LEDs, further reducing the scattering and loss of the light beam, making the light beam output of the entire backlight panel more efficient and reliable.

[0069] In an optional embodiment of the present application, the difference between the refractive index of the light-transmitting test plate and the refractive index of the rectangular body of the capacitor to be measured is less than a preset difference. It is understandable that the refractive index of the light-transmitting test plate is as close to or directly equal to the refractive index of the rectangular body of the capacitor to be measured as possible. The material of the light-transmitting test plate can use the same material as the rectangular body of the capacitor to be measured, in which case the refractive indexes of the two are naturally the same or similar; of course, other materials that are different from the rectangular body of the capacitor to be measured but have the same refractive index can also be used, and other materials are not limited in this embodiment. Selecting a light-transmitting test plate with the same refractive index as the rectangular body of the capacitor to be measured makes the position where the interference fringes are formed in the detection picture taken by the camera have a higher overlap rate with the test surface of the rectangular body of the capacitor to be measured. In this case, the position of the gap defect can be more accurately determined by image analysis of the detection picture.

[0070] In the second aspect, the present application provides a ceramic capacitor detection method based on visual nerves, which is applied to the ceramic capacitor detection system based on visual nerves of any one of the first aspects, including steps S1 to S4, wherein S1, S2, etc. are only step identifiers, and the execution order of the method is not necessarily in the order of numbers from small to large, for example, step S2 may be executed first and then step S1, and the present application does not impose any restrictions.

[0071] S1: Turn on the light source assembly of the first detection assembly and each backlight panel;

[0072] S2: Acquire a first detection picture captured by the first detection component and a second detection picture captured by each external camera;

[0073] S3: Identify the wedge-shaped interference fringes in the first detection image, and determine the position where the absolute value of the difference between the fringes width and the first preset fringes width is greater than a preset threshold as the gap position of the top surface to be tested;

[0074] S4: Identify the wedge-shaped interference fringes in the second detection image, and determine the position where the absolute value of the difference between the fringes width and the second preset fringes width is greater than a preset threshold as the gap position of the test side.

[0075] It can be understood that the visual nerve-based ceramic capacitor detection method provided by the present application realizes multi-dimensional and high-precision detection of the surface gaps of ceramic capacitors by comprehensively using the first detection component and the light source of multiple backlight panels. This method not only captures the first detection picture of the top surface of the capacitor, but also obtains the second detection picture of each side, thereby ensuring the comprehensiveness and accuracy of the detection. By identifying the sharp interference fringes in the detection picture and comparing them with the preset fringing width, the gap position can be accurately located, significantly improving the detection efficiency and reliability. In summary, the method of the present application effectively solves the cumbersome and inefficient problems of traditional visual detection methods, and provides a new solution for the rapid detection of ceramic capacitors on large-scale production lines, which helps to reduce product defective rates and improve the overall quality control level.

[0076] In an optional embodiment of the present application, the first preset stripe width is calculated by the following formula: ,in, represents the first preset stripe width, represents the wavelength of the light source of the first detection component, Represents the refractive index of the air between the top surface of the transparent test cover and the rectangular body of the capacitor to be tested, represents the first preset angle;

[0077] The second preset stripe width is calculated by the following formula: ,in, represents the second preset stripe width, represents the emission wavelength of each backlight panel, Represents the refractive index of the air between the light-transmitting test plate and the rectangular body of the capacitor to be tested, Represents the second preset angle.

[0078] In a third aspect, the present invention provides a computer-readable storage medium storing a computer program, wherein the computer program includes program instructions, and when the program instructions are executed by a processor, the steps of any method of the second aspect are implemented.

[0079] The computer-readable storage medium may be an internal storage unit of the terminal device of any of the aforementioned embodiments, such as a hard disk or memory of the terminal device. The computer-readable storage medium may also be an external storage device of the terminal device, such as a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), etc. equipped on the terminal device. Furthermore, the computer-readable storage medium may also include both an internal storage unit of the terminal device and an external storage device. The computer-readable storage medium is used to store the computer program and other programs and data required by the terminal device. The computer-readable storage medium may also be used to temporarily store data that has been output or is to be output.

[0080] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0081] In the several embodiments provided in the present application, it should be understood that the disclosed terminal device and method can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the above units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, or it can be an electrical, mechanical or other form of connection.

[0082] The units described above as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the embodiments of the present invention.

[0083] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0084] If the above-mentioned integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0085] The expressions "first", "second", "the first" or "the second" used in various embodiments of the present disclosure may modify various components regardless of order and / or importance, but these expressions do not limit the corresponding components. The above expressions are only configured for the purpose of distinguishing an element from other elements. For example, a first user device and a second user device represent different user devices, although both are user devices. For example, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element without departing from the scope of the present disclosure.

[0086] When one element (e.g., a first element) is referred to as being "(operably or communicatively) coupled" or "(operably or communicatively) coupled to" or "connected to" another element (e.g., a second element), it is understood that the one element is directly connected to the other element or the one element is indirectly connected to the other element via yet another element (e.g., a third element). Conversely, it is understood that when an element (e.g., a first element) is referred to as being "directly connected" or "directly coupled" to another element (the second element), no element (e.g., a third element) is interposed between the two.

[0087] It should be noted that, in this article, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "includes a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element. In addition, components, features, and elements with the same name in different embodiments of the present application may have the same meaning or different meanings, and their specific meanings need to be determined by their explanation in the specific embodiment or further combined with the context of the specific embodiment.

[0088] The above description is only an optional embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above invention concept. For example, the above features are replaced with the technical features with similar functions disclosed in this application (but not limited to) by each other.

[0089] As used herein, the words "if" and "if" may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0090] The above description is only an optional embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above invention concept. For example, the above features are replaced with the technical features with similar functions disclosed in this application (but not limited to) by each other.

[0091] The above description is only an optional embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A ceramic capacitor detection system based on visual nerves, characterized in that: include: A transparent test cover, used to cover the rectangular body of the capacitor to be tested through the opening, wherein the top surface of the transparent test cover is at a first preset angle relative to the top surface of the rectangular body of the capacitor to be tested; A first detection component is used to emit a detection beam to the top surface to be detected and capture a first detection picture of the wedge-shaped interference fringes occurring on the top surface; At least two backlight panels are fixed to different areas on the side of the transparent test cover and emit light toward the inside of the transparent test cover, and each backlight panel emits light in a different direction; At least four light-transmitting test panels are arranged in the transparent test cover; At least two positioning members are fixed on the inner wall of the side surface, and are used to guide the transparent test cover to cover the rectangular body of the capacitor to be tested in a preset posture, so that each test side surface of the rectangular body of the capacitor to be tested can be illuminated by the corresponding backlight panel, and each test side surface is arranged at a second preset angle with the corresponding light-transmitting test plate; At least two external cameras, disposed outside the transparent test cover, for capturing a second detection picture of each test side; A processor connected to the first detection component and the external camera, and configured to perform image analysis on the first detection picture and the second detection picture to determine whether there is a gap in the rectangular body of the capacitor to be tested; The first detection component includes a light source component and a top camera; the light beam emitted by the light source component is irradiated to the top surface to be tested of the rectangular body of the capacitor to be tested through the top surface of the transparent test cover, the surface of the top surface close to the top surface to be tested is the first surface, the reflected light of the first surface interferes with the reflected light of the top surface to be tested, and a wedge-shaped interference fringe is formed on the first surface; the top camera is used to shoot the wedge-shaped interference fringe to obtain a first detection picture; The first detection component also includes a polarizer, a polarization reflector and a quarter wave plate arranged between the light source component and the rectangular body of the capacitor to be tested; the polarizer is used to transmit the light beam in the first polarization direction, and the polarization reflector is used to transmit the light beam in the first polarization direction and reflect the light beams in other polarization directions; The light beam emitted by the light source assembly outputs a first polarized light beam after passing through the polarizer. The first polarized light beam passes through the polarizing reflector and the quarter-wave plate, and irradiates the top surface to be measured of the rectangular body of the capacitor to be measured. The light beam with the wedge-shaped interference fringes on the first surface is converted into a second polarized light beam in a second polarization direction after passing through the quarter-wave plate again. The second polarized light beam is reflected by the polarizing reflector to the top camera, so that the top camera can capture the wedge-shaped interference fringes to obtain a first detection screen.

2. The visual nerve-based ceramic capacitor detection system according to claim 1, characterized in that: The transparent test cover comprises a first side surface, a second side surface, a third side surface and a fourth side surface which are connected in sequence, and a top surface connected to each side surface; a first backlight panel is fixed to the second side surface, and a second backlight panel is fixed to the fourth side surface; A first clamping piece is arranged on the inner wall of the first side surface, and a second clamping piece is arranged on the inner wall of the third side surface. Under the guidance of the first clamping piece and the second clamping piece, each test side surface of the rectangular body of the capacitor to be tested is arranged between two adjacent side surfaces of the transparent test cover, and the light emitted by the first backlight panel can illuminate the first test side surface and the second test side surface of the rectangular body of the capacitor to be tested, and the light emitted by the second backlight panel can illuminate the third test side surface and the fourth test side surface of the rectangular body of the capacitor to be tested; The first camera is arranged relative to the first side, and is used to capture the second detection screen of the first test side and the second test side. The second camera is arranged relative to the third side, and is used to capture the second detection screen of the third test side and the fourth test side.

3. The ceramic capacitor detection system based on visual nerve according to claim 2 is characterized in that: Under the guidance of the first clamping member and the second clamping member, the first test side surface of the rectangular body of the capacitor to be tested forms a 45° angle with the first side surface and the second side surface on both sides, the second test side surface forms a 45° angle with the second side surface and the third side surface on both sides, the third test side surface forms a 45° angle with the third side surface and the fourth side surface on both sides, and the fourth test side surface forms a 45° angle with the fourth side surface and the first side surface on both sides; The first backlight panel emits light facing the second side surface, and the second backlight panel emits light facing the fourth side surface.

4. The visual nerve-based ceramic capacitor detection system according to claim 3, characterized in that: A first light transmittance test plate is disposed between the first side surface and the second side surface, wherein an angle between the first light transmittance test plate and the first side surface is greater than 45°, and an angle between the first light transmittance test plate and the second side surface is less than 45°; A second light transmittance test plate is disposed between the second side surface and the third side surface, wherein an angle between the second light transmittance test plate and the second side surface is less than 45°, and an angle between the second light transmittance test plate and the third side surface is greater than 45°; A third light transmittance test plate is disposed between the third side surface and the fourth side surface, wherein an angle between the third light transmittance test plate and the third side surface is greater than 45°, and an angle between the third light transmittance test plate and the fourth side surface is less than 45°; A fourth light transmittance test plate is arranged between the fourth side surface and the first side surface, and an angle between the fourth light transmittance test plate and the fourth side surface is less than 45°, and an angle between the fourth light transmittance test plate and the first side surface is greater than 45°.

5. The ceramic capacitor detection system based on visual nerve according to any one of claims 1 to 4, characterized in that: The backlight panel comprises: A circuit backplane, comprising a substrate, a driving circuit layer and a flat layer which are stacked, wherein a first contact pad and a second contact pad connected to the driving circuit layer are arranged on the flat layer; An LED array, wherein the positive electrode of each LED is welded to the first contact pad, and the negative electrode of the LED is welded to the second contact pad; A light blocking layer, covering the circuit back plate and filling between two adjacent LEDs; A microlens array, each microlens covers at least one corresponding LED, and is used to narrow the angle of the output light beam of the LED within a preset angle range.

6. The ceramic capacitor detection system based on visual nerve according to any one of claims 1 to 4, The difference between the refractive index of the light-transmitting test plate and the refractive index of the rectangular body of the capacitor to be tested is less than a preset difference.

7. A ceramic capacitor detection method based on visual nerves, applied to the ceramic capacitor detection system based on visual nerves according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1: Turn on the light source component of the first detection component and each of the backlight panels; S2: Acquire a first detection picture captured by the first detection component and a second detection picture captured by each of the external cameras; S3: Identify the wedge-shaped interference fringes in the first detection image, and determine the position where the absolute value of the difference between the fringes width and the first preset fringes width is greater than a preset threshold as the gap position of the top surface to be tested; S4: Identify the wedge-shaped interference fringes in the second detection image, and determine the position where the absolute value of the difference between the fringes width and the second preset fringes width is greater than a preset threshold as the gap position of the test side.

8. The ceramic capacitor detection method according to claim 7, comprising: The first preset stripe width is calculated by the following formula: ,in, represents the first preset stripe width, represents the wavelength of the light source of the first detection component, represents the refractive index of the air between the top surface of the transparent test cover and the rectangular body of the capacitor to be tested, represents the first preset angle; The second preset stripe width is calculated by the following formula: ,in, represents the second preset stripe width, represents the emission wavelength of each of the backlight panels, represents the refractive index of the air between the light-transmitting test plate and the rectangular body of the capacitor to be tested, represents the second preset angle.

Images