JP2001039048A - Production of printing pattern forming material and laminated ceramic electronic part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control clogging of an opening with paste even in repeated printing by making the plane shape of the opening to which the paste is to be supplied circular or elliptic, in a printing pattern forming material for the screen process printing of a prescribed shape using the paste. SOLUTION: In a printing pattern forming material 1, a conductive paste is supplied from the side of a one way main surface 1a, the paste is packed in openings 2,... whose plane shape is circular and an opening 3 located below. In printing, the paste packed in the openings 2,..., 3 is pressed to a printing medium, and the paste is applied on the medium for screen process printing. Since the plane shape of the openings 2,... is circular, even in repeated printing, the retention of the paste in the openings 2,... and the clogging of the openings 2,... can be controlled so that precision printing is possible without generating unclear printing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed pattern forming material for screen-printing a paste such as a conductive paste and a multilayer ceramic electronic component, and more particularly to an improved shape of an opening for supplying the paste. The present invention relates to a printed pattern forming material and a method for manufacturing a multilayer ceramic electronic component using the printed pattern forming material.

[0002]

2. Description of the Related Art Conventionally, in manufacturing a multilayer ceramic capacitor, first, a conductive paste is printed on a ceramic green sheet to form an internal electrode pattern. In this case, the printed pattern forming material 51 shown in FIGS. 8 and 9 is used for printing the conductive paste. That is, in the print pattern forming material 51, a plurality of rectangular openings 52 opened on one main surface 51a are formed. The inner part of the plurality of openings 52 has a second rectangular shape larger than the openings 52.
The opening 53 is connected to the opening 53.

[0003] The conductive paste is a printing pattern forming material 51.
Is supplied from the one main surface 51a side, and is filled in the opening 52 by a squeegee or the like. Then, conductive paste is supplied from the opening 52 to the large second rectangular opening 53 below, whereby a rectangular internal electrode pattern corresponding to the planar shape of the second opening 53 is printed on the ceramic green sheet. Is done.

That is, as shown by a dashed line in FIG.
The second opening 53 has a rectangular shape of a predetermined size, and the shape of the second opening 53 is the same as the internal electrode pattern. Nine openings 52 arranged in three rows and three columns as described above are arranged for one internal electrode pattern.

[0005]

However, when the process of printing a conductive paste on a ceramic green sheet using the above-described print pattern forming material 51 is repeated,
As shown in FIG. 10 in an enlarged manner, the conductive paste 54 tends to adhere to the corner 52a of the opening 52. In other words, the corner portion 52a tends to be clogged with the mesh which is the material forming the print pattern forming material at the corner portion due to the adhesion of the conductive paste 54. As a result, it becomes difficult to supply a sufficient amount of the conductive paste to the second opening 53 below the opening 52. Therefore, there is a problem that the printed figure of the conductive paste is blurred in printing, the printed area is reduced, and the capacitance of the multilayer ceramic capacitor is insufficient.

SUMMARY OF THE INVENTION An object of the present invention is to improve the above-mentioned conventional printing pattern forming material and the method for manufacturing a multilayer ceramic electronic component so that a printing pattern forming material which is unlikely to cause print blurring or printing defects due to paste clogging even when printing is repeated. And a method for manufacturing a multilayer ceramic electronic component using the printed pattern forming material.

[0007]

The present invention relates to a printing pattern forming material for screen-printing a paste in a predetermined shape, wherein the opening supplied with the paste has a substantially circular or substantially elliptical planar shape. It is characterized by being.

[0008] In a specific aspect of the print pattern forming material according to the present invention, a plurality of openings are arranged for one print figure, and the inner part of the plurality of openings has a shape of the print figure. It is linked to the corresponding second opening. In another specific aspect of the present invention, one opening is disposed for one printed figure, and the opening is a through hole having a substantially circular or substantially elliptical shape.

A method of manufacturing a multilayer ceramic electronic component according to the present invention comprises the steps of: printing a conductive paste on a ceramic green sheet using the print pattern forming material according to any one of claims 1 to 3; Laminating a plurality of printed ceramic green sheets, further laminating ceramic green sheets on which no conductive paste is printed above and below to obtain a laminate, and firing the laminate to obtain a sintered body And a step of forming a plurality of external electrodes on the outer surface of the sintered body.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be clarified by describing specific embodiments of the present invention with reference to the drawings.

FIG. 1A is a partially cutaway perspective view showing a print pattern forming material according to a first embodiment of the present invention. The print pattern forming material 1 is made of, for example, stainless steel or the like, and has a plurality of openings 2 opened on one main surface 1a. The opening 2 has a circular planar shape, and the inner part of the opening 2 is connected to a rectangular second opening 3 which is relatively large. The rectangular second opening 3 has a shape shown by a dashed line in FIG. In the print pattern forming material 1, a conductive paste is printed on a rectangular area corresponding to the planar shape of the second opening 3.

That is, the print pattern forming material 1 is shown in FIG.
Is different from the conventional print pattern forming material 51 shown in FIG. 1 in that the planar shape of the plurality of openings 2 is circular. The other points are the same as those of the conventional print pattern forming material 51.

In the print pattern forming material 1 of the present embodiment, the conductive paste is supplied from the one main surface 1a side, the supplied conductive paste is filled in the opening 2, and the rectangular second opening below the same. 3 is also filled.

At the time of printing, the conductive paste filled in the openings 2 and 3 is pressed against an object to be printed such as a ceramic green sheet, and the conductive paste is screen-printed on the ceramic green sheet.

In the printed pattern forming material 1 of the present embodiment, the conductive paste is supplied from the one main surface 1a side, so that the opening 2 has a circular plane shape. It is difficult for the previous conductive paste to remain in the inside 2 or for the opening 2 to be clogged. That is, in the conventional print pattern forming material 51, since the opening 52 has a rectangular shape, as shown in FIG. 10, the conductive paste remains at the corners and tends to cause clogging. .

On the other hand, in the printed pattern forming material 1 of this embodiment, since the opening 2 has a circular planar shape and has no corners, the conductive paste remains or is clogged with the remaining conductive paste. Hard to occur.

This will be described based on specific experimental examples. A conductive paste is screen-printed on the ceramic green sheet using the print pattern forming material 1 of the present embodiment and the conventional print pattern forming material 51 (see FIG. 8).
The relationship between the number of prints and the print area change rate was determined. FIG. 6 shows the results. In FIG. 6, the mark ● represents the result of the example, and the mark × represents the result of
2 shows the results when the conventional print pattern forming material shown in FIG.

As is clear from FIG. 6, according to the present embodiment, even if the number of printings exceeds 3,000, the printing area change rate is about -0.2%, which is smaller than the conventional printing pattern forming material. It can be seen that the rate at which the printing area decreases is about 1/10.

In the above-described embodiment, the opening 2 has a circular planar shape. However, the opening 2 is not necessarily required to be a perfect circle, and may have a shape slightly deviated from the perfect circle. That is, the planar shape of the opening 2 may be substantially circular.

The planar shape of the opening 2 may be elliptical. Also in the case of the elliptical shape, the conductive paste is unlikely to be clogged at the corners, so that the same effect as in the case of the substantially circular shape is obtained. In addition, the opening 2 may be shaped like an ellipse. For example, a substantially elliptical shape formed by connecting both ends of a pair of parallel line segments with a semicircle or the like may be used. Also in this case, since there is no corner portion where the straight lines cross each other, similarly, clogging of the conductive paste hardly occurs. Therefore, the planar shape of the opening 2 may be substantially circular or substantially elliptical, thereby suppressing clogging of the conductive paste.

Next, a method for manufacturing a multilayer capacitor using the printed pattern forming material 1 according to one embodiment of the present invention will be described with reference to FIGS. First, as shown in FIG.
For example, a ceramic slurry mainly composed of a dielectric ceramic powder such as a barium titanate-based ceramic is formed into a sheet, and a rectangular mother ceramic green sheet 1 is formed.
Get 1. A plurality of internal electrode patterns 12 are printed on the ceramic green sheet 11 using the print pattern forming material 1 shown in FIG. This internal electrode pattern 12
Is screen-printed using the print pattern forming material 1, so that even if printing is repeated many times, it is printed with high precision without causing print blurring.

Thereafter, a plurality of mother ceramic green sheets 11 on which the internal electrode patterns 12 are printed are laminated in accordance with the internal electrode laminating mode of the multilayer capacitor.
An appropriate number of plain ceramic green sheets are laminated on top and bottom. In this way, a mother laminate is obtained, and the mother laminate is cut in the thickness direction to obtain a laminate for each multilayer capacitor unit.

FIG. 3 is an exploded perspective view for explaining an internal electrode laminating mode in the laminated body obtained as described above, and FIG. 4 is a diagram showing individual laminated layers obtained as described above. It is a longitudinal cross-sectional view which shows the laminated body of a capacitor unit.

As shown in FIG. 3, in each of the laminates, the internal electrodes 14 and 15 formed on the ceramic green sheets 13 and 13 are alternately drawn out in opposite directions in the thickness direction. It is laminated. The internal electrodes 14 and 15 are formed by cutting the internal electrode pattern 12. Reference numerals 16 and 17 denote solid ceramic green sheets on which internal electrode patterns are not printed.

As shown in FIG. 4, in the obtained multilayer body 18 of each multilayer capacitor, the internal electrodes 14 and 15 are stacked so as to overlap with the ceramic layer interposed therebetween as described above.

Next, the laminated body 18 is fired to obtain a ceramic sintered body 19 shown in FIG. Ceramic sintered body 19
External electrodes 20 and 21 are formed on the first and second end faces 19a and 19b facing each other. Thus, the multilayer capacitor 22 is obtained. The external electrodes 20 and 21 may be formed by any method such as coating and baking of a conductive paste, plating, vapor deposition, or thin film formation such as sputtering, and a combination of two or more of these methods. You may.

In the multilayer ceramic capacitor 22 obtained by the manufacturing method of the present embodiment, the internal electrode pattern 12 is printed with high precision and without causing print blurring.
In 2, the internal electrodes 14 and 15 having an area close to the design value can be reliably formed. Therefore, it is possible to provide a multilayer capacitor having a small variation in capacitance and a sufficient capacitance. This will be described based on specific experimental examples.

In obtaining the multilayer capacitor 22,
1.6 × 0.8 × 0.8mm as ceramic sintered body
I prepared something. The dimensions of the internal electrodes in one multilayer capacitor were 1000 μm in length × 300 μm in width. Further, the number of laminated internal electrodes was 6, and the thickness of the ceramic layer between the internal electrodes was 18 μm. Under the above conditions, the design capacitance is 10 pF and the variation is the official standard B deviation, the design capacitance is 10 pF and the variation is in the official standard C deviation range, and the design capacitance is 100
Those having a pF and a variation within an F standard deviation were manufactured.

For comparison, a multilayer ceramic capacitor was manufactured in the same manner as in the example except that a conductive paste having a rectangular opening 52 shown in FIG. 8 was used for printing. The capacitance failure rate of each multilayer ceramic capacitor obtained as described above was evaluated.

In the printed pattern forming material of the embodiment, the diameter of the opening 2 having a circular planar shape is 50 μm, and 30 openings 2 are arranged in a matrix for one internal electrode having the above dimensions. Was used. Further, in the print pattern forming material 51 of the conventional example, a rectangular opening 52 having a width of 50 × length 50 is provided with respect to the internal electrode having the above dimensions.
Are arranged in a matrix.

The capacitance failure rate is 10 pF · B
Among the deviation products, those having a capacitance outside the range of 10 pF ± 0.1 pF were regarded as defective. Further, among the 10 pF · C deviation products, those with a value outside the range of 10 pF ± 0.25 pF were regarded as defective products. In addition, 100pF ± F for 100pF · F deviation product
Those out of the range of 1% were regarded as defective. The results are shown in Table 1 below.
Shown in

[0032]

[Table 1]

As is clear from Table 1, the rectangular opening 5
In the case where the conventional print pattern forming material 51 having No. 2 was used, in each case, the capacitance failure rate was extremely high. On the other hand, when the print pattern forming material of the example is used, it can be seen that the capacitance failure rate is significantly reduced, probably because the internal electrodes are reliably printed.

In the above embodiment, the openings 2 are arranged in a matrix. However, as shown in FIG. 7, a plurality of openings 2 may be arranged in a staggered manner. They may be distributed in a form.

In the above embodiment, the method of manufacturing a multilayer capacitor as a multilayer ceramic electronic component has been described.
The present invention can be generally used for a method of manufacturing a multilayer ceramic electronic component having a printing step using a conductive paste for an internal electrode. That is, the present invention can be applied to a method for manufacturing various multilayer ceramic electronic components such as a multilayer varistor, a multilayer thermistor, and a multilayer piezoelectric resonance component.

The printing pattern forming material according to the present invention can be used for printing not only the above-mentioned conductive paste but also other material pastes such as a dielectric paste and a resistance paste.

[0037]

According to the printing pattern forming material of the present invention, the planar shape of the opening on the side to which the paste is supplied is substantially circular or substantially elliptical. It is difficult to remain in the opening and clogging by the paste in the opening is hard to occur. Therefore, printing can be performed with high accuracy repeatedly using various pastes such as a conductive paste.

In the present invention, a plurality of the above-mentioned openings are arranged for one printed figure, and the inner part of the plurality of openings is connected to a second opening corresponding to the shape of the printed figure. In such a case, the planar shape of the opening is substantially circular or substantially elliptical, and clogging with the paste is unlikely to occur, so that a sufficient amount of paste is reliably supplied to the second opening. Therefore, the printed figure can be printed with high accuracy.

In the printed pattern forming material according to the present invention, only one opening may be provided for one printed figure. In this case, the opening is formed as a through hole. Thus, the paste is applied with high precision to the shape of the opening, that is, the substantially circular or substantially elliptical shape. Also in this case, since the adhesion of the paste to the opening and the clogging due to the paste are unlikely to occur, it is possible to perform printing with a high precision so as to obtain a desired printed figure as described above.

In the method for manufacturing a multilayer ceramic electronic component according to the present invention, a conductive paste is printed on a ceramic green sheet using the print pattern forming material according to the present invention. Therefore, by using a ceramic green sheet on which the conductive paste is printed, a laminate is obtained, and the laminate is fired to obtain a sintered body, and an external electrode is formed on the outer surface of the sintered body to obtain a desired area. It is possible to provide a multilayer ceramic electronic component having the internal electrodes with high precision and stability.

[Brief description of the drawings]

FIGS. 1A and 1B are partially cutaway perspective views of a print pattern forming material according to an embodiment of the present invention, and a relationship between one printed figure and a plurality of openings in the print pattern forming material. FIG.

FIG. 2 is a perspective view showing a state in which an internal electrode pattern is printed on a ceramic green sheet in one embodiment of the present invention.

FIG. 3 is an exploded perspective view for explaining a lamination mode of internal electrodes inside a laminate obtained in one embodiment of the present invention.

FIG. 4 is a longitudinal sectional view showing a laminated body prepared in one embodiment of the present invention.

FIG. 5 is a longitudinal sectional view showing a multilayer capacitor as a multilayer ceramic electronic component obtained in one embodiment of the present invention.

FIG. 6 is a diagram illustrating a relationship between the number of times of printing and a print area defect rate when a print pattern forming material according to one embodiment of the present invention is used and when a conventional print pattern forming material is used.

FIG. 7 is a schematic plan view for explaining another example of the arrangement of the openings in the print pattern forming material of the present invention.

FIG. 8 is a perspective view showing a conventional print pattern forming material.

FIG. 9 is a schematic plan view showing the relationship between one print figure and a plurality of openings in a conventional print pattern forming material.

FIG. 10 is an enlarged partial cutaway plan view showing a state in which a conductive paste remains in an opening and clogging occurs in a conventional print pattern forming material.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Print pattern forming material 2 ... Opening 2a ... Back part 3 ... Second opening 11 ... Ceramic green sheet 12 ... Internal electrode pattern 14, 15 ... Internal electrode 18 ... Laminate 19 ... Sintered body 20, 21 ... External electrode 22: Multilayer ceramic capacitor

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Yuji Matsui 2-26-10 Tenjin, Nagaokakyo-shi, Kyoto, Japan Inside Murata Manufacturing Co., Ltd. (72) Inventor Ken Sugiyama 2-26-10 Tenjin, Nagaokakyo-shi, Kyoto, Japan F-term in Murata Manufacturing (reference) 2H114 AB15 DA73 EA03 EA05 GA11 5E001 AB03 AE02 AE03 AF06 AH01 AH03 AH05 AH07 AH09 AJ01 AJ02 AJ03 AJ04

Claims (4)

[Claims] 1. A printing pattern forming material for screen-printing a paste in a predetermined shape, wherein a plane shape of an opening to which the paste is supplied is substantially circular or substantially elliptical. Print pattern forming material. 2. A plurality of openings are arranged for one printed figure, and a deep part of the plurality of openings is connected to a second opening corresponding to the shape of the printed figure. The printed pattern forming material according to claim 1, wherein: 3. The printing according to claim 1, wherein one opening is arranged for one printed figure, and the opening is a through hole having a substantially circular or substantially elliptical shape. Pattern forming material. 4. A step of printing a conductive paste on the ceramic green sheet using the print pattern forming material according to claim 1, and a plurality of ceramic green sheets on which the conductive paste is printed. Laminating ceramic green sheets on which conductive paste is not printed on the upper and lower sides to obtain a laminated body; firing the laminated body to obtain a sintered body; and an outer surface of the sintered body. Forming a plurality of external electrodes on the multilayer ceramic electronic component.