JPH053126B2 - - Google Patents

Description

Detailed Description of the Invention <Industrial Application Field> The present invention mainly relates to a method for manufacturing a laminated dielectric ceramic sheet used in manufacturing a laminated ceramic capacitor, and a dielectric material directly used in this method. Regarding porcelain sheets.

<Prior Art> Printing methods and sheet methods are well known as methods for manufacturing multilayer ceramic capacitors, but the present invention provides an electrode forming method for manufacturing ceramic capacitors by the sheet method. This is related to.

When manufacturing a laminated ceramic capacitor by the sheet method, conventionally, as shown in FIG. 1, an unfired dielectric ceramic sheet 2 on which an electrode pattern 1 is printed in a predetermined pattern on one surface, Two types of unfired dielectric porcelain sheets are prepared, and another unfired dielectric porcelain sheet 4 is printed with an electrode pattern 3 that overlaps with the electrode pattern 1 on the dielectric porcelain sheet 2. Overlapping electrodes of a multilayer capacitor were formed by alternately overlapping several of the two types of unfired dielectric ceramic sheets 2 and 4 so that the electrode patterns 1 and 3 faced each other.

<Problems to be Solved by the Invention> However, according to the conventional manufacturing method described above, at least two types of unfired dielectric porcelain sheets 2 and 4 with different electrode printing patterns are required, so that the plate making of the dielectric porcelain sheets is difficult. The process requires at least two steps, which makes the process inefficient, and due to errors in the alignment accuracy of the two types of dielectric ceramic sheets 2 and 4, the opposing overlapping area of the electrode patterns 1 and 3 changes, and the obtained capacitance fluctuates. Therefore, there are difficulties in that it is difficult to obtain a capacitance with high accuracy.

Therefore, the object of the present invention is to eliminate the above-mentioned conventional drawbacks, only need to provide one type of unfired dielectric porcelain sheet, and therefore to greatly improve the efficiency of the plate-making process and lamination process of the dielectric porcelain sheet. Moreover, it is possible to reduce the positional deviation between electrode patterns during the lamination process, suppress variations in the electrode overlap area, and the resulting fluctuations in the acquired capacitance.
An object of the present invention is to provide a method for manufacturing a laminated dielectric ceramic sheet that can efficiently manufacture a high-precision laminated ceramic capacitor, and a dielectric ceramic sheet that can be directly used in the implementation.

<Means for Solving the Problems> In order to solve the above-mentioned problems, the present invention provides a method for manufacturing a laminated dielectric ceramic sheet for a ceramic capacitor, which includes a step of laminating a plurality of unfired dielectric ceramic sheets having electrode patterns. In each of the green dielectric ceramic plates, the electrode pattern includes a first electrode pattern and a second electrode pattern, and the first electrode pattern and the second electrode pattern include a first electrode pattern and a second electrode pattern. The electrode patterns are arranged on both sides of a vertically imaginary reference line on the surface of the dielectric ceramic sheet, and the first electrode pattern includes a plurality of electrodes and is arranged on the surface of the dielectric ceramic sheet. Assuming horizontal rows and vertical columns, the electrodes are arranged in n rows and m columns (n, m>
2), the second electrode pattern includes a plurality of electrodes, and the electrodes are separated from each other by a gap at positions symmetrical to the first electrode pattern with respect to the reference line. The first electrode pattern and the second electrode pattern constitute a pattern with p rows and m columns (p>2), and the gap separating the electrodes in the vertical direction belongs to the other electrode pattern. The unfired dielectric ceramic sheets are arranged so as to be located approximately at the center of the electrode, and the plurality of unfired dielectric ceramic sheets are stacked with the reference lines aligned while being alternately reversed by 180 degrees.

The dielectric ceramic sheet according to the present invention, which is directly used in the method for producing a laminated dielectric ceramic sheet for a ceramic capacitor, is an unfired dielectric ceramic sheet for a ceramic capacitor having an electrode pattern on one surface, and the electrode The pattern includes a first electrode pattern,
a second electrode pattern, the first electrode pattern and the second electrode pattern are arranged on both sides of a vertically imaginary reference line on the surface of the dielectric ceramic sheet; The first electrode pattern includes a plurality of electrodes, and when imagining horizontal rows and vertical columns on the surface of the dielectric ceramic sheet, the electrodes are arranged in n rows and m columns separated from each other by gaps. (n, m>
2), the second electrode pattern includes a plurality of electrodes, and the electrodes are separated from each other by a gap at positions symmetrical to the first electrode pattern with respect to the reference line. The first electrode pattern and the second electrode pattern constitute a pattern with p rows and m columns (p>2), and the gap separating the electrodes in the vertical direction belongs to the other electrode pattern. It is arranged so as to be located approximately at the center of the electrode.

<Example> FIG. 2 is a diagram showing the manufacturing process of a laminated dielectric ceramic sheet for a ceramic capacitor according to the present invention. First, as shown in FIG. 2a, a reference line A is imagined on one surface of the unfired dielectric porcelain sheet 5 formed in an appropriate shape such as a rectangular shape, and first lines A are placed on both sides of the reference line A, which overlap to form electrodes. The electrode pattern 6 and the second electrode pattern 7 are each formed by means such as screen printing. The reference line A is imaginary in the vertical direction at the middle part in the width direction.

The first electrode pattern 6 includes a plurality of electrodes, which are formed in a pattern of n=3 rows to the left of the reference line A, separated by gaps g ₁ and g ₂ . Each row is imaginary horizontally and each column is imaginary vertically.

The second electrode pattern 7 has a plurality of electrodes, and the electrodes are arranged at a gap g ₃ on the right side of the reference line A, at a position symmetrical to the first electrode pattern 6 with respect to the reference line A.
and g ₄ in a pattern of p=3 rows and m=3 columns. In the first electrode pattern 6 and the second electrode pattern 7, the vertical gaps g ₁ and g ₃ are located approximately at the center of the electrodes of the other electrode pattern.

Next, a plurality of unfired dielectric ceramic sheets 5 having such an electrode pattern are stacked while being alternately reversed by 180 degrees so that the reference line A is aligned. That is, the second
As shown in FIG. b, the unfired dielectric porcelain sheet 51 in the state shown in FIG. The sheet 52 is laminated on the unfired dielectric porcelain sheet 51 before being reversed, aligned with the reference line A. This inversion operation is repeated depending on the required number of laminated layers.

In this case, the first electrode pattern 6 constitutes a pattern of three rows in which a plurality of electrodes are separated from each other by a gap _g2 , and the second electrode pattern 7
The plurality of electrodes constitute three rows of patterns separated from each other by a gap _g4 at positions symmetrical to the first electrode pattern 6 with respect to the reference line A, and the first electrode pattern 6 and the first electrode pattern Two electrode patterns 7 are arranged symmetrically with respect to the reference line I. For this reason, the unfired dielectric ceramic sheet 51 and the unfired dielectric ceramic sheet 52 are stacked so that the electrodes of the electrode pattern 6 and the second electrode pattern 7 face each other, forming opposing overlapping electrodes.

Moreover, the first electrode pattern 6 constitutes a pattern of four rows of electrodes separated from each other by a gap _g1 , and the second electrode pattern 7 comprises _{three rows} of electrodes separated from each other by a gap g3. The first electrode pattern 6 and the second electrode pattern 7 form a row pattern, and the vertical gaps g ₁ and g ₃ are located approximately at the center of the electrodes of the other electrode pattern. Therefore, the same unfired dielectric porcelain sheet 5
1 and the unfired dielectric ceramic sheet 52 are laminated by inverting them by 180 degrees, the electrodes of the electrode pattern 6 and the second electrode pattern 7 are laminated so as to face each other, forming opposing overlapping electrodes. . Also,
It is sufficient to print the electrode patterns 5 and 6 in the center of the unfired dielectric ceramic sheet, and there is no need to shift the electrode patterns 5 and 6. Therefore, electrode formation is facilitated, and space loss of the unfired dielectric ceramic sheet is reduced.

After that, as shown in FIG. 2c, before or after firing, _{the intermediate} position (X _{1 -}
By dividing on the (X ₆ −X ₆ ) and (Y ₁ −Y ₁ ) to (Y ₅ −Y ₅ ) lines, a single multilayer ceramic capacitor can be obtained. Therefore, according to the present invention, since it is only necessary to prepare one type of unfired dielectric ceramic sheet 5, the efficiency of the plate-making process and the lamination process of the dielectric ceramic sheet is greatly increased. Moreover, the electrode patterns of the plurality of stacked dielectric ceramic sheets 5 are exactly the same, and the printing position deviation of the electrode patterns between the dielectric ceramic sheets 5 is extremely small. Since the lamination alignment can be performed with high precision by simply using the same method, the positional deviation between the electrode patterns during the lamination process is also reduced, resulting in a high-precision porcelain capacitor with little variation in the electrode overlap area and resulting fluctuations in the acquired capacitance. is obtained.

Furthermore, since the first electrode pattern 6 and the second electrode pattern 7 are arranged so that the vertical gaps g ₁ and g ₃ are located approximately at the center of the electrodes belonging to the other electrode pattern, Gap after lamination
When divided at the intermediate position _{between g 1 and} g ₃ ( _{X 1 -}
The end faces of the electrodes belonging to the second electrode pattern 7 are exposed to opposing dividing planes, and the other end faces are sealed with a dielectric ceramic layer. Therefore, a multilayer ceramic capacitor can be obtained by providing end electrodes on the divided surfaces.

<Effects of the Invention> As described above, according to the present invention, the following effects can be obtained.

(a) A method for producing a laminated dielectric ceramic sheet for a ceramic capacitor, comprising the step of laminating a plurality of unfired dielectric ceramic sheets having electrode patterns, each of the unfired dielectric ceramic sheets having a first The electrode pattern and the second electrode pattern are arranged at both ends of a reference line vertically imagined on the surface of the dielectric ceramic sheet, and the first electrode pattern has a plurality of electrodes separated from each other by a gap. It consists of a pattern of n rows and m columns,
The second electrode pattern is located at a position where the plurality of electrodes are symmetrical to the first electrode pattern with respect to the reference line. , forming a pattern of p rows and m columns separated from each other by gaps, and a plurality of the above-mentioned unfired dielectric porcelain sheets are alternately
Since the layers are stacked while being turned 180 degrees while aligning the reference lines, the efficiency of the dielectric porcelain sheet plate-making process and layering process is extremely high.Moreover, the positional deviation between electrode patterns in the layering process is minimized, and electrode overlap is minimized. A method for manufacturing a laminated dielectric porcelain sheet and a dielectric porcelain sheet suitable for carrying out the method for efficiently manufacturing and obtaining a high-precision laminated porcelain capacitor that can suppress variations in area and the resulting variation in acquired capacity. Can be provided.

(b) The first electrode pattern constitutes a pattern of n rows and m columns in which a plurality of electrodes are separated from each other by gaps, and the second electrode pattern has a plurality of electrodes separated from each other by gaps. forming a pattern of p rows and m columns separated from each other by gaps at positions symmetrical to the electrode pattern;
Since the vertical gap in the first electrode pattern and the second electrode pattern is located approximately at the center of the electrodes in the other electrode pattern, the plural unfired dielectric porcelain sheets having the same configuration are reversed 180 degrees. Opposing overlapping electrodes can be formed by simply stacking the laminated dielectric ceramic sheets for a ceramic capacitor, and the dielectric ceramic sheets can be provided.

(c) The electrode pattern can be printed on the center of the unfired dielectric porcelain sheet, and there is no need to shift the electrode pattern, making electrode formation easy, and porcelain with less spacer loss in the unfired dielectric porcelain sheet. A method for manufacturing a laminated dielectric ceramic sheet for a capacitor and a dielectric ceramic sheet can be provided.

(d) The first electrode pattern and the second electrode pattern are arranged so that the gap separating the electrodes in the vertical direction is located approximately at the center of the electrodes belonging to the other electrode pattern, so that after lamination,
By dividing the gap at the middle position, between the overlapping dielectric ceramic layers, the end faces of the electrodes belonging to the first electrode pattern and the end faces of the electrodes belonging to the second electrode pattern are exposed to mutually opposite divided faces. , the other end face is sealed with a dielectric ceramic layer, and a method for manufacturing a laminated dielectric ceramic sheet for a ceramic capacitor, which makes it possible to obtain a laminated ceramic capacitor by providing an end electrode on the split surface, and a dielectric ceramic sheet We can provide sheets.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a conventional method for manufacturing a ceramic capacitor, and FIGS. 2 a to 2 c are diagrams showing a manufacturing process of a dielectric ceramic sheet for a ceramic capacitor according to the present invention. 5... Unfired dielectric ceramic sheet, 6... Second electrode pattern, 7... Electrode pattern, A... Reference line.

Claims (1)

[Scope of Claims] 1. A method for manufacturing a laminated dielectric ceramic sheet for a ceramic capacitor, comprising the step of laminating a plurality of unfired dielectric ceramic sheets having electrode patterns, each of the unfired dielectric ceramic sheets having an electrode pattern. In the above, the electrode pattern includes a first electrode pattern and a second electrode pattern, and the first electrode pattern and the second electrode pattern are arranged vertically on the surface of the dielectric ceramic sheet. arranged on both sides of an imagined reference line, the first electrode pattern includes a plurality of electrodes, and when horizontal rows and vertical columns are imagined on the surface of the dielectric ceramic sheet, The electrodes are arranged in n rows and m columns (n, m>
2), the second electrode pattern includes a plurality of electrodes, and the electrodes are separated from each other by a gap at positions symmetrical to the first electrode pattern with respect to the reference line. The first electrode pattern and the second electrode pattern constitute a pattern with p rows and m columns (p>2), and the gap separating the electrodes in the vertical direction belongs to the other electrode pattern. A laminated dielectric porcelain for a ceramic capacitor, which is arranged so as to be located approximately in the center of the electrode, and in which a plurality of the unfired dielectric porcelain sheets are alternately reversed by 180 degrees and laminated with the reference line aligned. Method of manufacturing sheets. 2. An unfired dielectric ceramic sheet for a ceramic capacitor having an electrode pattern on one surface, the electrode pattern comprising a first electrode pattern;
a second electrode pattern, the first electrode pattern and the second electrode pattern are arranged on both sides of a vertically imaginary reference line on the surface of the dielectric ceramic sheet; The first electrode pattern includes a plurality of electrodes, and when imagining horizontal rows and vertical columns on the surface of the dielectric ceramic sheet, the electrodes are arranged in n rows and m columns separated from each other by gaps. (n, m>
2), the second electrode pattern includes a plurality of electrodes, and the electrodes are separated from each other by a gap at positions symmetrical to the first electrode pattern with respect to the reference line. The first electrode pattern and the second electrode pattern constitute a pattern with p rows and m columns (p>2), and the gap separating the electrodes in the vertical direction belongs to the other electrode pattern. It is arranged so as to be located approximately at the center of the electrode. Dielectric ceramic sheet for ceramic capacitors.