A printing screen device for multilayer ceramic capacitors and its preparation method

Abstract

The present invention provides a printing screen device for multilayer ceramic capacitors and a method for making the same. The device comprises a printing screen; at least one product area pattern is distributed along the length of the printing screen; each product area pattern includes a capacitor chip area and a cutting line area, the capacitor chip area including multiple electrode patterns; the cutting line area is disposed outside the capacitor chip area; the device is used to cut the ceramic film to form a laminate; the cut is matched with the cutting line area by a laminating machine according to a preset lamination formula, and the laminate is stacked using the matched lamination scheme to form a facing area and a fixed blank area on the laminate, with an inactive electrode area added to one side of the fixed blank area. The present invention can adjust the facing area, and improves MLCC production efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of component manufacturing, and in particular to a printing screen device for a multilayer ceramic capacitor and a preparation method thereof. Background Art

[0002] Multilayer ceramic capacitors are made by stacking ceramic dielectric diaphragms with printed electrodes (inner electrodes) in an offset manner, sintering them at a single high temperature to form a ceramic chip. A metal layer (outer electrode) is then sealed at both ends of the chip to form a monolithic structure. Due to its excellent filtering performance, it is widely used in various fields.

[0003] Nowadays, MLCC has a multi-layer structure. The single-layer electrode contains an effective facing area and a blank area. The facing area is mainly used to form an energy storage structure; the blank area is mainly a safety distance between the inner electrode and the outer electrode to avoid abnormalities during use.

[0004] Due to the differences in the internal structure of MLCC and the differences in product model specifications during the production process, the number of printed screens used will increase due to the differences, thereby increasing production costs. In addition, the use of multiple printed screens to produce MLCC will lead to huge differences in the number of layers of different models, making it impossible to effectively control the parasitic parameters of the entire MLCC series. Summary of the Invention

[0005] In response to the shortcomings of the above-mentioned related technologies, the present invention proposes a printing screen device for multilayer ceramic capacitors that can adjust the facing area of ​​the internal electrodes of MLCC, thereby reducing the number of screens used during production, effectively controlling the parasitic parameters of MLCC, and improving the performance of MLCC.

[0006] In order to solve the above technical problems, an embodiment of the present invention provides a printing screen device for a multilayer ceramic capacitor, including a printing screen;

[0007] On the printing screen, at least one product area graphic is distributed in the length direction of the printing screen;

[0008] Each of the product area graphics includes a capacitor chip area and a cutting line area;

[0009] The capacitor chip area includes a plurality of electrode patterns, and the electrode patterns are used to form corresponding product electrodes by screen printing electrode slurry on the ceramic film;

[0010] The cutting line area is provided outside the capacitor chip area and is used to cut the ceramic film to obtain a laminated body;

[0011] A stacking machine is used to match the cutting line area according to a preset stacking formula, and the stacked body is stacked using the matched stacking scheme; so that a facing area and a fixed blank area are formed on the stacked body, and an invalid electrode area is added to one side of the fixed blank area.

[0012] Preferably, the cutting line area includes four color blocks, and the four color blocks correspond to the four vertex corners of the capacitor chip area; the color block is provided with a notch for cutting alignment; the notch is a long strip notch, the length direction of the long strip notch is parallel to the X-axis direction, and both ends of the long strip notch pass through the color block.

[0013] Preferably, the area between the two color blocks distributed along the X-axis in the cutting line area includes a plurality of cutting line filling areas and a plurality of cutting line vacant areas, wherein the plurality of cutting line filling areas are staggered to form a plurality of cutting line vacant areas, the sum of the width of the cutting line filling area and the width of an adjacent cutting line vacant area is b1, the width of the cutting line vacant area is b2, the length of the cutting line vacant area is a2, and the length of the cutting line filling area is a1;

[0014] The capacitor chip area includes a plurality of capacitor chips, the length of each capacitor chip is b, and the sum of the width of each capacitor chip and the width of the margin of each capacitor chip is a.

[0015] Preferably, the following conditions are met: a=a1=a2, b=b1.

[0016] Preferably, the electrode pattern is rectangular.

[0017] Preferably, the cutting line area includes a plurality of cutting lines, and the plurality of cutting lines are uniformly distributed outside the capacitor chip area along the X-axis and Y-axis directions of the printing screen.

[0018] In a second aspect, an embodiment of the present invention provides a method for preparing a multilayer ceramic capacitor, comprising:

[0019] Printing a dielectric film according to a preset pattern using the above-mentioned screen printing equipment for the multilayer ceramic capacitor;

[0020] Setting a fixed Y-axis direction shift value so that the cutting line area graphics overlap;

[0021] Set the adjustable offset number in the X-axis direction so that the internal electrodes of the MLCC reach the preset facing area;

[0022] After the offsets in the Y-axis and X-axis directions are set, the printing medium film is laminated;

[0023] cutting the cutting line at the notch of the color block in the cutting line area;

[0024] Obtain the cut MLCC chips.

[0025] Preferably, the printing screen device satisfies the following conditions: a=a1=a2, b=b1, wherein b is the length of the capacitor chip, a2 is the length of the cutting line vacant area, and a1 is the length of the cutting line filling area; a is the sum of the width of the capacitor chip and the width of the margin of the capacitor chip, and b1 is the sum of the width of the cutting line filling area and the width of an adjacent cutting line vacant area.

[0026] Preferably, after the offset numbers in the Y-axis and X-axis directions are set, the printing medium film is laminated, including:

[0027] When the number of shifts along the X axis during stacking is c-b2, the facing area is the largest area;

[0028] When the number of shifts along the X axis during stacking is c1, the facing area is the smallest area;

[0029] Wherein, c is the width of the capacitor chip, c1 is the distance between two adjacent capacitor chips, and b2 is the width of the vacant area of ​​the cutting line of the printing screen equipment.

[0030] Compared with the related art, the present invention distributes at least one product area graphic on the length direction of the printed screen; each product area graphic includes a capacitor chip area and a cutting line area; the capacitor chip area includes a plurality of electrode graphics, and the electrode graphics are used to screen-print the electrode slurry on the ceramic film to form corresponding product electrodes; the cutting line area is arranged on the outside of the capacitor chip area, and is used to cut the ceramic film to obtain a stacked body; the stacking machine is matched with the cutting line area according to a preset stacking formula, and the stacked body is stacked using the matched stacking scheme to form a facing area and a fixed blank area on the stacked body, and an invalid electrode area is added to one side of the fixed blank area. In this way, after adding an ineffective electrode to the blank space of the electrode to fix the blank space of the single-layer electrode, the stacking stagger number is adjusted within a certain range to change the facing area of ​​the electrode inside the MLCC, so as to achieve the purpose of reducing the number of screens used during production; by producing MLCC in a way of changing the facing area, the internal design of MLCC of a series of capacity segments can be fixed to a uniform number of internal electrode layers, so that the parasitic parameters of the MLCC can be effectively controlled and the performance of the MLCC can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The present invention will be described in detail below with reference to the accompanying drawings. The above and other aspects of the present invention will become clearer and easier to understand through the detailed description made with reference to the following drawings. In the accompanying drawings:

[0032] Figure 1 Schematic diagram of the structure of the printing screen equipment of the multilayer ceramic capacitor of the present invention;

[0033] Figure 2 This is a schematic diagram of the internal structure of a commonly used MLCC;

[0034] Figure 3 Schematic diagram of the internal structure of the adjustable facing area MLCC of the present invention;

[0035] Figure 4 Schematic diagram of the internal structure of the adjustable facing area MLCC of the present invention when facing the maximum area;

[0036] Figure 5 Schematic diagram of the internal structure of the adjustable facing area MLCC of the present invention when facing the minimum area;

[0037] Figure 6 This is a schematic diagram of the screen patterns of the present invention after being staggered and superimposed along the Y axis;

[0038] Figure 7 Schematic diagram of the screen pattern of the present invention after being staggered and superimposed along the Y-axis and the X-axis;

[0039] Figure 8 The present invention is a flow chart of a method for preparing a multilayer ceramic capacitor.

[0040] In the figure, 1. Product area graphic, 11. First product area graphic, 12. Second product area graphic, 2. Capacitor chip area, 3. Cutting line area, 4. Facing area, 5. Fixed blank area, 6. Invalid electrode area, 7. Color block. DETAILED DESCRIPTION

[0041] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0042] The specific embodiments / examples described herein are specific embodiments of the present invention and are used to illustrate the concept of the present invention. They are illustrative and exemplary and should not be construed as limiting the embodiments of the present invention or the scope of the present invention. In addition to the examples described herein, those skilled in the art can also adopt other obvious technical solutions based on the claims and the disclosure of the specification. These technical solutions, including any obvious replacements and modifications of the embodiments described herein, are all within the scope of protection of the present invention.

[0043] Example 1

[0044] Please see the attached Figure 1-7 As shown, Figure 1 Schematic diagram of the structure of the printing screen equipment of the multilayer ceramic capacitor of the present invention; Figure 2 This is a schematic diagram of the internal structure of a commonly used MLCC; Figure 3 Schematic diagram of the internal structure of the adjustable facing area MLCC of the present invention; Figure 4 Schematic diagram of the internal structure of the adjustable facing area MLCC of the present invention when facing the maximum area; Figure 5 Schematic diagram of the internal structure of the adjustable facing area MLCC of the present invention when facing the minimum area; Figure 6 This is a schematic diagram of the screen patterns of the present invention after being staggered and superimposed along the Y axis; Figure 7 It is a schematic diagram of the screen patterns of the present invention after being staggered and superimposed along the Y-axis and the X-axis.

[0045] The present invention provides a printing screen device for a multilayer ceramic capacitor, comprising a printing screen; on the printing screen, at least one product area graphic 1 is distributed in the longitudinal direction of the printing screen; each of the product area graphics 1 includes a capacitor chip area 2 and a cutting line area 3; the capacitor chip area 2 includes a plurality of electrode graphics, and the electrode graphics are used to screen-print electrode slurry on a ceramic film to form corresponding product electrodes; the cutting line area 3 is arranged outside the capacitor chip area 2, and is used to cut the ceramic film to obtain a stacked body; a stacking machine is used to match the cutting line area 3 according to a preset stacking formula, and the stacked body is stacked using the matched stacking scheme, so that a facing area area 4 and a fixed blank area 5 are formed on the stacked body, and an invalid electrode area 6 is added to one side of the fixed blank area 5. By adding an invalid electrode area 6 in the electrode blank area to fix the blank space of the single-layer electrode, the stacking stagger number is adjusted within a certain range to change the facing area of ​​the electrode inside the MLCC, so as to achieve the purpose of reducing the number of silk screens used during production; by producing MLCC in a way of changing the facing area, the internal design of MLCC of a series capacity segment can be fixed to a uniform number of internal electrode layers, so that the parasitic parameters of the MLCC can be effectively controlled and the performance of the MLCC can be improved.

[0046] In this embodiment, the cutting line area 3 includes four color blocks 7, and the four color blocks 7 are distributed corresponding to the four vertex corners of the capacitor chip area 2. The color blocks 7 are provided with notches for cutting alignment; the notches are long strip notches, the length direction of the long strip notches is parallel to the X-axis direction, and the two ends of the long strip notches pass through the color blocks. When the product area pattern is fixed, the cutting line at the notch is cut. When stacking, the dislocation layer is first dislocated in the Y-axis direction so that the cutting lines between the two layers of graphics can overlap, and then the dislocation layer is shifted in the X-axis direction to determine the size of the facing area. Finally, the identification area on the edge of the stacked product is cut (i.e., the identification notch) to reveal the cutting area.

[0047] In this embodiment, the area between the two color blocks 7 distributed along the X-axis in the cutting line area 3 includes a plurality of cutting line filling areas and a plurality of cutting line vacant areas. The plurality of cutting line filling areas are staggered to form a plurality of cutting line vacant areas. The sum of the width of the cutting line filling area and the width of an adjacent cutting line vacant area is b1, the width of the cutting line vacant area is b2, the length of the cutting line vacant area is a2, and the length of the cutting line filling area is a1.

[0048] The capacitor chip area 2 includes a plurality of capacitor chips, the length of each capacitor chip is b, and the sum of the width of each capacitor chip and the width of the margin of each capacitor chip is a.

[0049] In this embodiment, the following conditions are met: a = a1 = a2, b = b1. By setting a = a1 = a2, the color block 7 in the cutting line area 3 needs to be provided with a blank alignment cutting point for cutting the cutting line after lamination, exposing the corresponding cutting point to facilitate pattern cutting.

[0050] In this embodiment, the electrode pattern is a rectangle. The main purpose of the through-type square structure is to ensure the connectivity between the two ends of the long axis.

[0051] In this embodiment, the cutting line area 3 includes a plurality of cutting lines, and the plurality of cutting lines are uniformly distributed outside the capacitor chip area 2 along the X-axis and Y-axis directions of the printing screen.

[0052] Example 2

[0053] like Figure 8 As shown, Figure 8 The flowchart of the method for preparing a multilayer ceramic capacitor of the present invention is as follows. The embodiment of the present invention provides a method for preparing a multilayer ceramic capacitor, comprising:

[0054] S1. Printing a dielectric film according to a preset pattern using the screen printing device for the multilayer ceramic capacitor in the first embodiment;

[0055] S2, setting a fixed Y-axis direction shift value so that the cutting line area 3 graphics overlap;

[0056] S3. Set the adjustable offset number in the X-axis direction so that the internal electrodes of the MLCC reach the preset facing area;

[0057] S4, after the offset numbers in the Y-axis and X-axis directions are set, the printing medium film is laminated;

[0058] S5, cutting the cutting line at the notch of the color block 7 in the cutting line area 3;

[0059] S6. Obtain the cut MLCC chips.

[0060] Specifically, based on the special pattern printed on the dielectric film, a fixed Y-axis shift value a is set to achieve pattern overlap in the cutting line area 3. The adjustable X-axis offset value is then set to achieve the ideal facing area for the MLCC internal electrodes. After the offset values ​​are set in both directions, the printed dielectric film is laminated, and the cutting line is cut at the notch of the color block 7 in the cutting line area 3. Finally, a cutting machine is used to cut the MLCC chip. By varying the facing area during MLCC production, the internal design of MLCCs within a series of capacity segments can be fixed to a uniform number of internal electrode layers, effectively controlling the MLCC's parasitic parameters and improving its performance.

[0061] In this embodiment, the printing screen device satisfies the following conditions: a=a1=a2, b=b1, where b is the length of the capacitor chip, a2 is the length of the cutting line empty area, and a1 is the length of the cutting line filling area; a is the sum of the width of the capacitor chip and the width of the margin of the capacitor chip, and b1 is the sum of the width of the cutting line filling area and the width of an adjacent cutting line empty area.

[0062] In this embodiment, after the offset numbers in the Y-axis and X-axis directions are set, the printing medium film is laminated, including:

[0063] When the number of shifts along the X axis during stacking is c-b2, the facing area 4 is the largest area;

[0064] When the number of shifts along the X axis during stacking is c1, the facing area region 4 has the smallest area;

[0065] Wherein, c is the width of the capacitor chip, c1 is the distance between two adjacent capacitor chips, and b2 is the width of the vacant area of ​​the cutting line of the printing screen equipment.

[0066] When the number of shifts along the X-axis during stacking is c-b2, the facing area 4 has the largest area. When the number of shifts along the X-axis during stacking is c1, the facing area 4 has the smallest area; where c is defined as the length of the capacitor chip and c1 is the distance between two adjacent capacitor chips. By setting different shift numbers, different facing areas 4 can be obtained. By varying the facing area during MLCC production, the internal design of MLCCs within a series of capacity segments can be fixed to a uniform number of internal electrode layers. This effectively controls the parasitic parameters of the MLCC and improves its performance.

[0067] Of course, the number of product area graphics 1 on the printed screen needs to be adjusted according to the actual capacitor processing requirements.

[0068] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be encompassed within the scope of the claims.

Claims

1. A printing screen device for multilayer ceramic capacitors, characterized in that: Includes printing screen; On the printing screen, at least one product area graphic is distributed in the length direction of the printing screen; Each of the product area graphics includes a capacitor chip area and a cutting line area; The capacitor chip area includes a plurality of electrode patterns, and the electrode patterns are used to form corresponding product electrodes by screen printing electrode slurry on the ceramic film; The cutting line area is provided outside the capacitor chip area and is used to cut the ceramic film to obtain a laminated body; A stacking machine is used to match the cutting line area according to a preset stacking formula, and the stacked body is stacked using the matched stacking scheme, so that a facing area and a fixed blank area are formed on the stacked body, and an inactive electrode area is added to one side of the fixed blank area; The cutting line area includes four color blocks, which are distributed corresponding to the four vertex corners of the capacitor chip area; each color block is provided with a notch for cutting alignment; the notch is a long strip notch, the length direction of the long strip notch is parallel to the X-axis direction, and the two ends of the long strip notch pass through the color block; Two color blocks are distributed along the X-axis in the cutting line area, and the area between the two color blocks includes a plurality of cutting line filling areas and a plurality of cutting line vacant areas, wherein the plurality of cutting line filling areas are staggered to form a plurality of cutting line vacant areas, the sum of the width of the cutting line filling area and the width of an adjacent cutting line vacant area is b1, the width of the cutting line vacant area is b2, the length of the cutting line vacant area is a2, and the length of the cutting line filling area is a1; The capacitor chip area includes a plurality of capacitor chips, the length of each capacitor chip is b, and the sum of the width of each capacitor chip and the width of the margin of each capacitor chip is a; The following conditions are met: a=a1=a2, b=b1.

2. The printing screen device for multilayer ceramic capacitors according to claim 1, wherein: The electrode pattern is a rectangle.

3. The printing screen device for multilayer ceramic capacitors according to claim 1, wherein: The cutting line area includes a plurality of cutting lines, and the plurality of cutting lines are uniformly distributed outside the capacitor chip area along the X-axis and Y-axis directions of the printing screen.

4. A method for preparing a multilayer ceramic capacitor, characterized in that: include: Printing a dielectric film according to a preset pattern using a printing screen device for a multilayer ceramic capacitor according to any one of claims 1 to 3; Setting a fixed Y-axis direction shift value so that the cutting line area graphics overlap; Set the adjustable offset number in the X-axis direction so that the internal electrodes of the MLCC reach the preset facing area; After the offsets in the Y-axis and X-axis directions are set, the printing medium film is laminated; cutting the cutting line at the notch of the color block in the cutting line area; Obtain the cut MLCC chips.

5. The method for preparing a multilayer ceramic capacitor according to claim 4, wherein: The printing screen device satisfies the following conditions: a=a1=a2, b=b1, where b is the length of the capacitor chip, a2 is the length of the cutting line vacant area, and a1 is the length of the cutting line filling area; a is the sum of the width of the capacitor chip and the width of the margin of the capacitor chip, and b1 is the sum of the width of the cutting line filling area and the width of an adjacent cutting line vacant area.

6. The method for preparing a multilayer ceramic capacitor according to claim 5, wherein: After the offsets in the Y-axis and X-axis directions are set, the printing medium film is laminated, including: When the number of shifts along the X axis during stacking is c-b2, the facing area is the largest area; When the number of shifts along the X axis during stacking is c1, the facing area is the smallest area; Wherein, c is the width of the capacitor chip, c1 is the distance between two adjacent capacitor chips, and b2 is the width of the vacant area of ​​the cutting line of the printing screen equipment.

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