CN115810493A - Printing screen equipment of multilayer ceramic capacitor and preparation method thereof - Google Patents

Abstract

The invention provides a printing silk screen device of a multilayer ceramic capacitor and a preparation method thereof, comprising a printing silk screen; distributing at least one product area pattern in the length direction of the printing screen; each product area pattern comprises a capacitor chip area and a cutting line area, and the capacitor chip area comprises a plurality of electrode patterns; the cutting line area is arranged on the outer side of the capacitor chip area; the ceramic film is cut to obtain a laminated body; and matching the cut line region with the laminating machine according to a preset laminating formula, and stacking the laminated body by adopting a matched laminating scheme so as to form a dead area region and a fixed margin region on the laminated body, wherein an invalid electrode region is additionally arranged on one side of the fixed margin region. The invention can adjust the opposite area and has high MLCC production efficiency.

Description

Printing silk screen equipment of multilayer ceramic capacitor and preparation method thereof

Technical Field

The invention relates to the technical field of component manufacturing, in particular to printing screen equipment of a multilayer ceramic capacitor and a preparation method thereof.

Background

The multilayer ceramic capacitor is formed by overlapping ceramic dielectric films printed with electrodes (inner electrodes) in a staggered mode, forming a ceramic chip through one-time high-temperature sintering, and sealing metal layers (outer electrodes) at two ends of the chip to form a structure body similar to a monolithic body, and the multilayer ceramic capacitor is widely applied to various fields by virtue of excellent filtering performance.

At present, the inside of the MLCC is of a multilayer structure, a single-layer electrode comprises an effective facing area part and a blank part, and the facing area part is mainly used for forming an energy storage structure; the margin part is mainly the safety distance between the inner electrode and the outer electrode, so that the abnormity in use is avoided.

According to the difference of the internal structure of the MLCC in the production process according to the product model specification, the number of used printing silk screens is increased due to the difference, so that the production cost is increased, the number of layers of different models is greatly different due to the fact that a plurality of printing silk screens are used for producing the MLCC, and the parasitic parameters of the whole series of the MLCC cannot be effectively controlled.

Disclosure of Invention

Aiming at the defects of the related technologies, the invention provides the silk screen printing equipment of the multilayer ceramic capacitor, which can adjust the dead-against area of the electrode in the MLCC, thereby reducing the number of silk screens used in production, effectively controlling the parasitic parameters of the MLCC and improving the performance of the MLCC.

In order to solve the above technical problem, an embodiment of the present invention provides a printing screen apparatus of a multilayer ceramic capacitor, including a printing screen;

distributing at least one product area pattern on the printing screen in the length direction of the printing screen;

each product area graph comprises a capacitor chip area and a cutting line area;

the capacitor chip area comprises a plurality of electrode patterns, and the electrode patterns are used for forming corresponding product electrodes on the ceramic film through screen printing of electrode slurry;

the cutting line area is arranged on the outer side of the capacitor chip area and used for cutting the ceramic film to obtain a laminated body;

matching the cutting line area through a laminating machine according to a preset laminating formula, and stacking the laminated body by adopting a matched laminating scheme; so that the laminated body is provided with a facing area region and a fixed blank region, and one side of the fixed blank region is additionally provided with an invalid electrode region.

Preferably, the cutting line region comprises four color blocks, and the four color blocks are distributed corresponding to four vertex angles of the capacitor chip region; the color block is provided with a notch for cutting alignment; the notch is a strip-shaped notch, the length direction of the strip-shaped notch is parallel to the X-axis direction, and two ends of the strip-shaped notch penetrate through the color blocks.

Preferably, the two color blocks are distributed in the cutting line region along the X-axis direction, a region between the two color blocks includes a plurality of cutting line filling regions and a plurality of cutting line vacant regions, the plurality of cutting line filling regions are staggered to form the plurality of cutting line vacant regions, the sum of the width of each cutting line filling region and the width of one adjacent cutting line vacant region is b1, the width of each cutting line vacant region is b2, the length of each cutting line vacant region is a2, and the length of each cutting line filling region is a1;

the capacitor chip area comprises 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.

Preferably, the following conditions are satisfied: a = a1= a2, b = b1.

Preferably, the electrode pattern is rectangular.

Preferably, the cutting line area includes a plurality of cutting lines, and the plurality of cutting lines are uniformly distributed on the outer side of the capacitor chip area along the X-axis and Y-axis directions of the printing screen.

In a second aspect, an embodiment of the present invention provides a method for manufacturing a multilayer ceramic capacitor, including:

printing a medium diaphragm according to a preset pattern by using the printing screen equipment of the multilayer ceramic capacitor;

setting a fixed Y-axis direction displacement number to enable the cutting line region graphs to be overlapped;

setting an adjustable dislocation number in the X-axis direction to enable the MLCC internal electrode to reach a preset dead-against area;

after the dislocation numbers in the Y-axis direction and the X-axis direction are set, laminating the printing medium film;

cutting the cutting line at the notch of the color block in the cutting line area;

and obtaining the cut MLCC chip.

Preferably, the printing screen apparatus satisfies the following conditions: a = a1= a2, b = b1, where b is the length of the capacitive chip, a2 is the length of the area where the scribe line is vacant, and a1 is the length of the area where the scribe line is filled; 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.

Preferably, after setting the number of displacements in both the Y-axis and X-axis directions, the method of laminating the printing medium sheets includes:

when the shift number along the X axis is c-b2 during lamination, the area of the opposite surface area is the maximum area;

when the shift number along the X axis is c1 during lamination, the dead area is the minimum area;

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

Compared with the prior art, the invention distributes at least one product area pattern on the printing silk screen in the length direction of the printing silk screen; each product area pattern comprises a capacitor chip area and a cutting line area, the capacitor chip area comprises a plurality of electrode patterns, and the electrode patterns are used for forming corresponding product electrodes on the ceramic film through screen printing of electrode slurry; the cutting line area is arranged on the outer side of the capacitor chip area and used for cutting the ceramic film to obtain a laminated body; matching the cutting line region through a laminating machine according to a preset laminating formula, and stacking the laminated body by adopting a matched laminating scheme so as to form a dead area region and a fixed margin region on the laminated body, wherein an invalid electrode region is additionally arranged on one side of the fixed margin region. After a blank space of the single-layer electrode fixed by the invalid electrode is added at the blank position of the electrode, the number of lamination faults is adjusted in a certain range to change the dead area of the electrode in the MLCC, so that the purpose of reducing the number of silk screens used in production is achieved; the MLCCs are produced by changing the dead area, the internal design of the MLCCs of a series of capacity sections can be fixed as the number of the uniform internal electrode layers, so that the parasitic parameters of the MLCCs can be effectively controlled, and the performance of the MLCCs is improved.

Drawings

The present invention will be described in detail below with reference to the accompanying drawings. The foregoing and other aspects of the invention will become more apparent and more readily appreciated from the following detailed description, taken in conjunction with the accompanying drawings. In the drawings:

FIG. 1 is a schematic view of the construction of a printing screen apparatus for a multilayer ceramic capacitor according to the present invention;

FIG. 2 is a schematic diagram of the internal structure of a conventional MLCC;

FIG. 3 is a schematic diagram of an internal structure of an adjustable dead-front area MLCC according to the invention;

FIG. 4 is a schematic diagram of the internal structure of the adjustable dead-front area MLCC according to the invention when dead-front is applied to the maximum area;

FIG. 5 is a schematic diagram of the internal structure of the adjustable dead-front area MLCC of the present invention facing the minimum area;

FIG. 6 is a schematic view of the screen patterns of the present invention superimposed in a staggered manner along the Y-axis;

FIG. 7 is a schematic view of a screen pattern of the present invention superimposed with a shift in the Y-axis and X-axis;

FIG. 8 is a flow chart of a method of manufacturing a multilayer ceramic capacitor according to the present invention.

In the figure, 1, a product area graph, 11, a first product area graph, 12, a second product area graph, 2, a capacitor chip area, 3, a cutting line area, 4, a facing area, 5, a fixed blank area, 6, an invalid electrode area, 7 and a color block.

Detailed Description

The following detailed description of the embodiments of the invention refers to the accompanying drawings.

The embodiments/examples described herein are specific embodiments of the invention, are intended to be illustrative of the concepts of the invention, are exemplary and explanatory, and should not be construed as limiting the embodiments of the invention and the scope of the invention. In addition to the embodiments described herein, those skilled in the art will be able to employ other technical solutions which are obvious based on the disclosure of the claims and the specification of the present application, and these technical solutions include the technical solutions of making any obvious replacement or modification of the embodiments described herein, and are within the scope of the present invention.

Example one

Referring to fig. 1 to 7, fig. 1 is a schematic view showing a structure of a printing screen apparatus for a multilayer ceramic capacitor according to the present invention; FIG. 2 is a schematic diagram of the internal structure of a conventional MLCC; FIG. 3 is a schematic diagram of an internal structure of an adjustable dead-front area MLCC according to the invention; FIG. 4 is a schematic diagram of the internal structure of the adjustable dead-front area MLCC according to the invention when dead-front is applied to the maximum area; FIG. 5 is a schematic diagram illustrating an internal structure of the adjustable dead-front area MLCC of the invention facing a minimum area; FIG. 6 is a schematic view of a screen pattern of the present invention superimposed with a shift along the Y-axis; fig. 7 is a schematic view of the screen pattern of the present invention superimposed with a shift in the Y-axis and X-axis.

The invention provides a printing silk screen device of a multilayer ceramic capacitor, which comprises a printing silk screen; distributing at least one product area pattern 1 on the printing screen in the length direction of the printing screen; each product area graph 1 comprises a capacitor chip area 2 and a cutting line area 3; the capacitor chip area 2 comprises a plurality of electrode patterns, and the electrode patterns are used for forming corresponding product electrodes on the ceramic film by screen printing electrode slurry; the cutting line region 3 is arranged on the outer side of the capacitor chip region 2 and used for cutting the ceramic film to obtain a laminated body; matching with the cutting line region 3 through a laminating machine according to a preset laminating formula, and stacking the laminated body by adopting a matched laminating scheme so as to form a dead area region 4 and a fixed margin region 5 on the laminated body, wherein an invalid electrode region 6 is additionally arranged on one side of the fixed margin region 5. After the blank space of a single-layer electrode is fixed by adding an invalid electrode area 6 in the electrode blank area, adjusting the number of lamination faults within a certain range to change the dead area of the electrode in the MLCC, thereby achieving the purpose of reducing the number of silk screens used in production; the MLCCs are produced by changing the dead areas, the internal design of the MLCCs of a series of capacity sections can be fixed as the uniform number of layers of the internal electrodes, thus the parasitic parameters of the MLCCs can be effectively controlled, and the performance of the MLCCs is improved.

In this embodiment, the cutting line region 3 includes four color blocks 7, the four color blocks 7 are distributed corresponding to four vertex angles of the capacitor chip region 2, and the color blocks 7 are provided with notches for cutting alignment; the notch is a strip-shaped notch, the length direction of the strip-shaped notch is parallel to the X-axis direction, and two ends of the strip-shaped notch penetrate through the color blocks. And after the product area graph is fixed, cutting the cutting line at the notch. When in lamination, the dislocation layer is firstly dislocated in the Y-axis direction, so that cutting lines between two layers of patterns can be superposed, then the dislocation layer is shifted in the X-axis direction to determine the size of the dead area, and finally the edge identification area of the laminated product is cut (namely, a gap is identified), and the cutting area is exposed.

In this embodiment, the two color patches 7 distributed in the cutting line region 3 along the X-axis direction, a region between the two color patches 7 includes a plurality of cutting line filling regions and a plurality of cutting line vacancy regions, the plurality of cutting line filling regions are staggered to form the plurality of cutting line vacancy regions, a sum of a width of the cutting line filling region and a width of an adjacent cutting line vacancy region is b1, a width of the cutting line vacancy region is b2, a length of the cutting line vacancy region is a2, and a length of the cutting line filling region is a1;

the capacitor chip area 2 comprises 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.

In the present embodiment, the following conditions are satisfied: a = a1= a2, b = b1. By setting a = a1= a2, the color blocks 7 in the scribe line region 3 need to be provided with blank alignment scribe points for cutting the scribe lines after lamination, so as to expose the corresponding scribe points, thereby facilitating pattern cutting.

In this embodiment, the electrode pattern is rectangular. The main purpose of the through-type square structure is to ensure the communication between the two ends of the long shaft.

In this embodiment, the cutting line region 3 includes a plurality of cutting lines, and the plurality of cutting lines are uniformly distributed on the outer side of the capacitor chip region 2 along the X-axis and Y-axis directions of the printing screen.

Example two

Referring to fig. 8, fig. 8 is a flowchart illustrating a method for manufacturing a multilayer ceramic capacitor according to the present invention. The embodiment of the invention provides a preparation method of a multilayer ceramic capacitor, which comprises the following steps:

s1, printing a medium diaphragm according to a preset pattern by utilizing the printing screen equipment of the multilayer ceramic capacitor in the first embodiment;

s2, setting a fixed Y-axis direction displacement number to enable the cutting line area 3 to be overlapped in a graph mode;

s3, setting an adjustable dislocation number in the X-axis direction to enable the MLCC internal electrode to reach a preset dead-against area;

s4, after the dislocation numbers in the Y-axis direction and the X-axis direction are set, laminating the printing medium film;

s5, cutting a cutting line at the notch of the color block 7 in the cutting line area 3;

and S6, obtaining the cut MLCC chip.

Specifically, according to a special pattern printing medium membrane, a fixed Y-axis direction shift number a is set to enable the cutting line area 3 to be subjected to pattern superposition, an adjustable X-axis direction dislocation number is set to enable the MLCC internal electrode to reach an ideal opposite area, the printing medium membrane is laminated → the cutting line is cut at a color block 7 gap in the cutting line area 3 after the dislocation numbers in the two directions are set, and finally, a cutting machine is used for cutting the MLCC chip. The MLCCs are produced by changing the dead area, the internal design of the MLCCs of a series of capacity sections can be fixed as the number of the uniform internal electrode layers, so that the parasitic parameters of the MLCCs can be effectively controlled, and the performance of the MLCCs is improved.

In this embodiment, the printing screen apparatus satisfies the following conditions: a = a1= a2, b = b1, where b is the length of the capacitor chip, a2 is the length of the vacant region of the cutting line, and a1 is the length of the region filled with the cutting line; 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.

In this embodiment, after setting the number of displacements in both the Y-axis and X-axis directions, laminating the print medium film sheets includes:

when the shift number along the X axis is c-b2 during lamination, the area directly opposite to the area region 4 is the maximum area;

when the number of shifts along the X axis during lamination is c1, the dead area region 4 is the minimum 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.

The facing area region 4 is the maximum area when the number of shifts along the X-axis at the time of lamination is c-b 2. When the number of shifts along the X axis during lamination is c1, the dead area region 4 is the minimum area; wherein c is defined as the length of the capacitor chip, and c1 is the distance between two adjacent capacitor chips. Different dead area areas 4 can be obtained through setting different shift numbers, the MLCC is produced by changing the dead area, the internal design of the MLCC of a series of capacity sections can be fixed as the number of uniform internal electrode layers, and therefore the parasitic parameters of the MLCC can be effectively controlled, and the performance of the MLCC is improved.

Of course, the number of product area patterns 1 on the printing screen needs to be adjusted according to the actual capacitor processing requirements.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any tampering, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims (9)

1. A printing screen apparatus of a multilayer ceramic capacitor, comprising a printing screen;

distributing at least one product area pattern on the printing screen in the length direction of the printing screen;

each product area graph comprises a capacitor chip area and a cutting line area;

the capacitor chip area comprises a plurality of electrode patterns, and the electrode patterns are used for forming corresponding product electrodes on the ceramic film through screen printing of electrode slurry;

the cutting line area is arranged on the outer side of the capacitor chip area and used for cutting the ceramic film to obtain a laminated body;

matching the cutting line area through a laminating machine according to a preset laminating formula, and stacking the laminated body by adopting a matched laminating scheme; so that the laminated body is provided with a facing area region and a fixed blank region, and one side of the fixed blank region is additionally provided with an invalid electrode region.

2. The apparatus of claim 1, wherein the cut line region comprises four color blocks, four of the color blocks corresponding to four apex angles of the capacitor chip region; the color block is provided with a notch for cutting alignment; the notch is a strip-shaped notch, the length direction of the strip-shaped notch is parallel to the X-axis direction, and two ends of the strip-shaped notch penetrate through the color blocks.

3. The printing screen apparatus of a multilayer ceramic capacitor as claimed in claim 2, wherein two of the color patches of the scribe line region are arranged in the X-axis direction, a region between the two color patches includes a plurality of scribe line filling regions and a plurality of scribe line clearance regions, the plurality of scribe line filling regions are alternately arranged to form the plurality of scribe line clearance regions, a sum of a width of the scribe line filling region and a width of an adjacent scribe line clearance region is b1, a width of the scribe line clearance region is b2, a length of the scribe line clearance region is a2, and a length of the scribe line filling region is a1;

the capacitor chip area comprises 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.

4. The printing screen apparatus of a multilayer ceramic capacitor as claimed in claim 3, characterized in that the following conditions are satisfied: a = a1= a2, b = b1.

5. The printing screen apparatus of a multilayer ceramic capacitor according to claim 1, wherein the electrode pattern is rectangular.

6. The printing screen apparatus of a multilayer ceramic capacitor as claimed in claim 1, wherein the cutting line region includes a plurality of cutting lines, and the plurality of cutting lines are uniformly distributed outside the capacitor chip region in both X-axis and Y-axis directions of the printing screen.

7. A method of making a multilayer ceramic capacitor, comprising:

printing the dielectric sheet according to a predetermined pattern using a printing screen apparatus of the multilayer ceramic capacitor as claimed in any one of claims 1 to 6;

setting a fixed Y-axis direction displacement number to enable the cutting line region graphs to be overlapped;

setting an adjustable dislocation number in the X-axis direction to enable the MLCC internal electrode to reach a preset dead-against area;

after the dislocation numbers in the Y axis direction and the X axis direction are set, laminating the printing medium film;

cutting the cutting line at the notch of the color block in the cutting line area;

and obtaining the cut MLCC chip.

8. The method of manufacturing a multilayer ceramic capacitor according to claim 7, wherein the printing screen apparatus satisfies the following condition: a = a1= a2, b = b1, where b is the length of the capacitor chip, a2 is the length of the vacant region of the cutting line, and a1 is the length of the region filled with the cutting line; 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.

9. The method of manufacturing a multilayer ceramic capacitor according to claim 8, wherein the laminating the printed dielectric sheets after setting the number of displacements in both the Y-axis and X-axis directions includes:

when the shift number along the X axis is c-b2 during lamination, the area of the opposite surface area is the maximum area;

when the shift number along the X axis is c1 during lamination, the dead area is the minimum 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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