A printing screen for quickly detecting a creepage distance, an MLCC and a detection method thereof

Abstract

The application discloses a printing screen for quickly detecting a creepage distance, an MLCC and a detection method thereof. The printing screen comprises a screen body, and a plurality of parallel and staggered internal electrode patterns are arranged on the screen body. The screen body is provided with a plurality of detection buried points for detecting the creepage distance. The screen body is provided with a plurality of cutting lines, and each detection buried point is arranged on the cutting line. The detection buried point connects at least two groups of adjacent internal electrode patterns on the two sides of the cutting line. Thus, the detection of the creepage distance in the long direction of the MLCC can be realized, the product does not need to be disassembled for detection, the detection efficiency is improved, and the detection difficulty is reduced.

Description

Technical Field

[0001] This invention relates to an MLCC, and more particularly to a printing screen for rapid detection of creepage distance, an MLCC, and a detection method thereof. Background Technology

[0002] MLCC is an abbreviation for Multilayer Ceramic Chip Capacitor. It is made by stacking ceramic dielectric films with printed electrodes (internal electrodes) in a staggered manner, sintering them at high temperature in one go to form a ceramic chip, and then sealing the two ends of the chip with metal layers (external electrodes), thus forming a monolithic structure, hence it is also called a monolithic capacitor.

[0003] Creepage distance determines the withstand voltage performance of a product. During the MLCC cutting process, the creepage distance along the long direction of the product needs to be sampled and inspected to confirm the cutting quality. Existing inspection methods require destroying the product before inspection. Not only does the testing require additional tools, but the operation is also complex and time-consuming, making the inspection inconvenient. Summary of the Invention

[0004] The purpose of this invention is to provide a printing screen, MLCC and its detection method for rapid detection of creepage distance. By using this structure and method, the convenience and efficiency of detecting creepage distance in the long direction of the product are improved.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: a printing screen for rapid detection of creepage distance, comprising a screen body, wherein the screen body is provided with a plurality of parallel and intersecting inner electrode patterns, the screen body is provided with a plurality of detection embedding points for creepage distance detection, the screen body is provided with a plurality of cutting lines, and each of the detection embedding points is disposed on the cutting line; the detection embedding points connect at least two adjacent sets of inner electrode patterns on both sides of the cutting line.

[0006] In the above technical solution, the detection embedding point includes a connecting mark graphic and two sets of side mark graphics. The two sets of side mark graphics are respectively set on both sides of the cutting line. The connecting mark graphic connects the two sets of side mark graphics, and the middle part of the connecting mark graphic is set on the cutting line.

[0007] In the above technical solution, the side marking graphic includes two adjacent sets of inner electrode graphics along the length direction of the mesh body, and the two adjacent sets of inner electrode graphics are connected.

[0008] In the above technical solution, the two ends of the connection between the connecting mark graphic and the side mark graphic are respectively provided with concave corners, and the concave corners are provided on the side wall of the side mark graphic.

[0009] In the above technical solution, the distance between the concave corner and the cutting line is twice the distance between the side marking graphic and the cutting line.

[0010] In the above technical solution, the concave corner is a square or rectangular concave corner.

[0011] To achieve the above objectives, this invention employs an MLCC, which uses the aforementioned printing screen for rapid detection of creepage distance to print internal electrodes and detection points.

[0012] To achieve the above objectives, this invention employs a method for detecting the creepage distance of MLCCs, the steps of which are as follows:

[0013] ① Based on the internal electrode pattern and the detection embedding points, print the internal electrode and the detection embedding points on the ceramic film;

[0014] ② The ceramic films are repeatedly stacked, and after reaching the preset number of layers, they are cut along the cutting line to form a ceramic chip;

[0015] ③ The detection points will be exposed on the side of the cut ceramic chip, and the creepage distance of the ceramic chip in the long direction can be detected directly through the detection points;

[0016] ④ During the testing process, ceramic chips with detection embedding points are identified and discarded.

[0017] In the above technical solution, in step ④, the side marking pattern in the detection point is connected by two sets of adjacent electrodes along the longitudinal direction. During the creepage distance test, a short circuit effect will occur, which can directly eliminate it.

[0018] In the above technical solution, in step ④, if the ceramic chip with the detection embedded point is not removed, after subsequent electroplating, its surface will have an external plating phenomenon, which can be directly detected by visual inspection and removed.

[0019] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0020] 1. In this invention, multiple detection points are set on the printing screen, and the detection points are all set on the cutting line at the position where the product needs to be cut. After the product is cut, the inner electrode at the detection point will be directly exposed on the side of the product at the cut. The long-direction creepage distance of the product can be detected directly through this exposed inner electrode, which improves the convenience of detection, improves the efficiency of detection, reduces the difficulty of detection, and eliminates the need to disassemble the product for inspection.

[0021] 2. In this invention, the side marking pattern in the detection embedding point connects two sets of adjacent inner electrode patterns along the longitudinal direction. This will create a short circuit effect, which allows products with detection embedding points to be directly identified and rejected in subsequent testing stations, thereby improving the product qualification rate.

[0022] 3. In this invention, since the detection points are set on the cutting line, after the products are printed and stacked, the inner electrode at the detection point will be exposed after the products are cut along the cutting line. In this way, even if it is not detected and rejected during short circuit detection, it will be externally plated during the subsequent electroplating process. It can be manually inspected for secondary rejection, which plays a double insurance role and ensures the product qualification rate.

[0023] 4. In this invention, by setting a concave angle in the detection embedded point, the area prone to diffusion during printing is avoided. The connection point of the connecting mark graphic and the side mark graphic is far away from the connection point of the inner electrode during the printing process, so that the inner electrode of the product cutting surface is clear, avoiding misjudgment of creepage distance detection due to diffusion, improving detection accuracy and ensuring detection quality. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure in Embodiment 1 of the present invention;

[0025] Figure 2 This is a schematic diagram of the detection embedding point in Embodiment 1 of the present invention;

[0026] Figure 3 This is a schematic diagram of the short circuit of the inner electrode at the detection embedding point of the product after both sides of the product are powered on in Embodiment 1 of the present invention.

[0027] The components are: 1. Mesh body; 2. Inner electrode pattern; 3. Detection embedding point; 4. Cutting line; 5. Connection mark pattern; 6. Side mark pattern; 7. Concave corner. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0029] Example 1: See Figures 1-3 As shown, a printing screen for rapid detection of creepage distance includes a screen body 1, on which multiple parallel and intersecting inner electrode patterns 2 are provided, and multiple detection embedding points 3 for creepage distance detection are provided on the screen body. Multiple sets of cutting lines 4 are provided on the screen body, and each detection embedding point is set on the cutting line; the detection embedding point connects at least two adjacent sets of inner electrode patterns on both sides of the cutting line.

[0030] In this embodiment, the internal electrode pattern and detection points are printed onto a ceramic diaphragm via the screen printing body. This results in the internal electrodes being printed on the ceramic diaphragm, and the detection points are also considered internal electrodes. The cutting line is aligned with the area of ​​the product to be cut. After the product is printed and stacked, cutting it along the cutting line exposes the internal electrodes at the detection points on the side of the product, specifically the longitudinal internal electrodes. This allows for creepage distance measurement along the product's longitudinal direction using these detection points, eliminating the need for destructive testing, thus improving testing efficiency, convenience, and reducing testing difficulty.

[0031] See Figure 1 , 2 As shown, the detection embedding point includes a connecting marker graphic 5 and two sets of side marker graphics 6. The two sets of side marker graphics are respectively set on both sides of the cutting line. The connecting marker graphic connects the two sets of side marker graphics, and the middle part of the connecting marker graphic is set on the cutting line.

[0032] The side marking graphic includes two adjacent sets of inner electrode graphics along the length of the mesh body, and the two adjacent sets of inner electrode graphics are connected.

[0033] In this embodiment, the cutting line on the screen printing body is a virtual cutting line. After the product is printed with internal electrodes through the screen printing body, this cutting line corresponds to the position of the product, which is where the product needs to be cut. The side marking graphic is formed by connecting two adjacent internal electrode graphics with opposite longitudinal directions. The connecting marking graphic is located on the cutting line. After the product printing is completed, after cutting along the cutting line, the internal electrode at the connecting marking graphic will be exposed on the side of the product. That is, the internal electrodes in the longitudinal direction of the product are connected. It is not necessary to damage the product to test the creepage distance in the longitudinal direction. The creepage distance in the longitudinal direction of the product can be detected through this exposed internal electrode on the side, which has high detection efficiency, good convenience, fast detection speed, and lower detection difficulty.

[0034] In this embodiment, since the side marking graphic includes two adjacent longitudinal inner electrode graphics, the two adjacent longitudinal inner electrodes printed on the product will connect. This creates a short circuit when the product is powered on from both sides. Therefore, after the creepage distance test is completed, products with the printed detection point are directly rejected based on this short circuit (this area is only for creepage distance testing; the product itself is unqualified), ensuring product quality. Furthermore, if any products with the printed detection point are missed during the power-on test, there will be over-plating during the subsequent electroplating process. Subsequent manual visual inspection or industrial camera inspection allows for a second sampling inspection, removing unqualified products and providing double protection to ensure a high product pass rate. Currently, it can reject 100% of products with the printed detection point.

[0035] See Figure 1 , 2 As shown, the two ends of the connection between the connecting logo and the side logo are respectively provided with concave corners 7, which are located on the side wall of the side logo. The concave corners are square or rectangular, and are straight concave corners.

[0036] Furthermore, the distance between the concave corner and the cutting line is twice the distance between the side marking graphic and the cutting line. The distance between the cutting line and the side marking graphic is 0.1 mm, and the distance between the cutting line and the inner side of the concave corner is 0.2 mm.

[0037] In this embodiment, if the connecting mark graphic is directly connected to the side mark graphic, the connection point is a right angle. During subsequent printing of the inner electrode, the right angle printing will have a diffusion area, causing the printed inner electrode edges to spread and potentially reach the product cutting interface. This can lead to misjudgments during the long-direction creepage distance detection. Therefore, by setting a concave corner, the distance between the connection point of the connecting mark graphic and the side mark graphic and the cutting line is increased. This prevents diffusion even if it occurs, ensuring that it will not spread to the product cutting interface. This makes the inner electrode at the product cutting interface clear, preventing misjudgments in creepage distance detection caused by diffusion, and thus ensuring the accuracy and stability of the detection.

[0038] To achieve the above objectives, the present invention employs an MLCC, which uses a printing screen as described above to print internal electrodes and detection points for rapid creepage distance detection.

[0039] To achieve the above objectives, this invention employs a method for detecting the creepage distance of MLCCs, the steps of which are as follows:

[0040] ① Based on the internal electrode pattern and the detection embedding points, print the internal electrode and the detection embedding points on the ceramic film;

[0041] ② The ceramic films are repeatedly stacked, and after reaching the preset number of layers, they are cut along the cutting line to form a ceramic chip;

[0042] ③ The detection points will be exposed on the side of the cut ceramic chip, and the creepage distance of the ceramic chip in the long direction can be detected directly through the detection points;

[0043] ④ During the testing process, ceramic chips with detection embedding points are identified and discarded.

[0044] In step ④, the side marking pattern in the detection point is connected by two sets of adjacent electrodes along the longitudinal direction. During the creepage distance test, a short circuit effect will occur, which can directly eliminate it.

[0045] In step ④, if the ceramic chip with the detection embedded point is not removed, its surface will have an external plating phenomenon after subsequent electroplating, which can be directly detected by visual inspection and removed.

[0046] In this embodiment, the inner electrode pattern and detection points on the screen printing body are used to print the inner electrode and the inner electrode at the detection points on the ceramic diaphragm. This allows the inner electrode to be exposed on the side of the product cut, facilitating the detection of the product's long-direction creepage distance. At the same time, since the two sets of inner electrodes adjacent in the long direction at the detection point are connected, a short circuit will occur when the product is powered on from both sides. This allows products with the inner electrode printed at the detection point to be detected and rejected, thus ensuring the product pass rate.

[0047] In this embodiment, 144 detection points are evenly distributed on the screen printing body. This allows for monitoring of the product cutting quality and ensures cutting quality. The number of detection points can be selected based on the size of the screen printing body and the actual situation of the product; the number can be increased or decreased depending on the specific product and screen printing body. The multiple detection points enable monitoring of the cutting process, improving cutting quality and shortening the cutting cycle to approximately 80% compared to previous methods. This increases cutting efficiency and product production efficiency, thereby reducing production costs.

Claims

1. A printing screen for rapid detection of creepage distance, comprising a screen body, wherein the screen body is provided with a plurality of parallel and interlaced internal electrode patterns, characterized in that: The mesh body is provided with multiple detection points for creepage distance detection, and the mesh body is provided with multiple sets of cutting lines, with each detection point set on the cutting line; The detection embedding point connects at least two adjacent sets of internal electrode patterns on both sides of the cutting line; The detection embedding point includes a connecting mark graphic and two sets of side mark graphics. The two sets of side mark graphics are respectively set on both sides of the cutting line. The connecting mark graphic connects the two sets of side mark graphics, and the middle part of the connecting mark graphic is set on the cutting line. The side marking graphic includes two adjacent sets of inner electrode graphics along the length of the mesh body, and the two adjacent sets of inner electrode graphics are connected. The two ends of the connection between the connecting logo and the side logo are respectively provided with concave corners, and the concave corners are provided on the side wall of the side logo.

2. The printing screen for rapid detection of creepage distance according to claim 1, characterized in that: The distance between the concave corner and the cutting line is twice the distance between the side marking graphic and the cutting line.

3. The printing screen for rapid detection of creepage distance according to claim 2, characterized in that: The concave corner is a square or rectangular concave corner.

4. An MLCC, characterized in that: The printing plate used for rapid detection of creepage distance is used to print internal electrodes and detection points.

5. A method for detecting the creepage distance of an MLCC as described in claim 4, comprising the following steps: ① Based on the internal electrode pattern and the detection embedding points, print the internal electrode and the detection embedding points on the ceramic film; ② The ceramic films are repeatedly stacked, and after reaching the preset number of layers, they are cut along the cutting line to form a ceramic chip; ③ The detection points will be exposed on the side of the cut ceramic chip, and the creepage distance of the ceramic chip in the long direction can be detected directly through the detection points; ④ During the testing process, ceramic chips with detection embedding points are identified and discarded.

6. The method for detecting MLCC creepage distance according to claim 5, characterized in that: In step ④, the side marking pattern in the detection point is connected by two sets of adjacent electrodes along the longitudinal direction. During the creepage distance test, a short circuit effect will occur, which can directly eliminate it.

7. The method for detecting MLCC creepage distance according to claim 5, characterized in that: In step ④, if the ceramic chip with the detection embedded point is not removed, its surface will have an external plating phenomenon after subsequent electroplating, which can be directly detected by visual inspection and removed.

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