JP2005238594A - Printing pattern forming material and manufacturing method of electronic part employing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a printing pattern forming material, with which a printing pattern with near aimed dimensions and shapes can be precisely formed through precise screen printing even under the state that the dimensions of the printing pattern become smaller than usual, and the manufacturing method of an electronic part employing thereof. <P>SOLUTION: One through hole 2, through which paste is fed, is arranged opposite to one printing figure 1 under the condition that the area of the through hole 2 is set to be smaller than that of the printing figure 1 and the longitudinal direction of the through hole is set to be parallel to the moving direction A of a squeegee and, at the same time, a narrow width part 2a, which is narrower in width than the widths of other portions is provided at the middle part in the longitudinal direction of the through hole. In addition, the width NW of the narrow width part 2a of the through hole 2 is set to lie within the range of 20-70% of the width TW of the other portions 2b of the through hole. Further, through the process for forming the predetermined printing pattern by printing electrically conductive paste with the printing pattern forming material concerned, the electronic part is manufactured. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a printed pattern forming material and a method for manufacturing an electronic component using the same, and more particularly to a printed pattern forming material used in a screen printing method and the like and a method for manufacturing an electronic component using the same.

  For example, as shown in FIG. 4, a multilayer ceramic capacitor, which is one of the typical multilayer ceramic electronic components, has a plurality of internal electrodes 23a and 23b facing each other through a ceramic layer 22 inside a ceramic element 21. The one end side is alternately drawn out to the end faces 25a and 25b on different sides of the ceramic element 21 and is electrically connected to the internal electrodes 23a and 23b on both end sides of the ceramic element 21. A pair of external electrodes 24a, 24b is provided.

  And this multilayer ceramic capacitor usually has an electrode printed sheet on which the internal electrode pattern is formed by screen printing a conductive paste on the surface of the ceramic green sheet, and the internal electrode pattern is formed on both upper and lower sides. It is manufactured by laminating a predetermined number of non-ceramic green sheets, pressing them, cutting them at predetermined positions, dividing them into individual elements, firing them, and forming external electrodes.

  In forming the internal electrode pattern by screen printing the conductive paste on the ceramic green sheet, for example, as shown in FIG. A so-called mesh-patterned printing pattern forming material (screen printing mask) 60 having a through-hole 52 is generally used.

  However, when the multilayer ceramic electronic component is reduced in size and becomes a size of 0.6 mm length × 0.3 mm width or less, a plurality of through holes 52 are densely formed in one printed figure 51 as shown in FIG. Therefore, there is a problem that the strength of the region where the printed pattern 51 of the printed pattern forming material 60 is formed is lowered. On the other hand, when the through holes are roughly arranged to ensure the strength of the area where the printed figure 51 is formed, the printed paste film can be obtained even if the intensity of the area where the printed figure 51 is formed can be ensured. There is a problem that the thickness of the (print pattern) becomes non-uniform.

  Therefore, as shown in FIGS. 6A and 6B, a printed pattern forming material 60 in which only one through hole 52 to which a paste is supplied is provided for one printed figure 51 may be used. Yes (see Patent Document 1).

However, for example, as shown in FIGS. 7A and 7B, when screen printing is performed on one printed figure 51 using a print pattern forming material 60 in which one through hole 52 is provided, When a screen pattern is printed by moving a squeegee (not shown) parallel to the longitudinal direction of the through hole 52 (in the direction of arrow A in FIG. 7A), the center of the through hole 52 is formed. FIG. 8B shows an example of a target rectangular print pattern (for example, an electrode pattern) 61 as shown in FIG. 8A, for example. As described above, in the actual print pattern 61 (61a), the dimension in the width direction of the central portion 62 becomes larger than the target dimension in the width direction, and a desired print pattern cannot be obtained. There is.
JP 2001-39048 A

  The present invention solves the above-mentioned problems, and even when the size of the print pattern is reduced, screen printing is accurately performed, and a print pattern close to the target size and shape is accurately formed. It is an object of the present invention to provide a printed pattern forming material that can be used and an electronic component manufacturing method using the same.

In order to solve the above problems, the printed pattern forming material of the present invention (Claim 1) is:
A printing pattern forming material used for forming a printing pattern of a predetermined shape by screen printing a paste,
One through-hole to which paste is supplied is arranged for one printed figure,
The through-hole has a smaller area than the printed figure, the longitudinal direction is parallel to the moving direction of the squeegee, and has a narrow portion narrower than other portions in the central portion in the longitudinal direction. It is characterized by.

  The printed pattern forming material according to claim 2 is characterized in that the width of the narrow portion of the through hole is in the range of 20 to 70% of the width of the other portion.

  Moreover, the manufacturing method of the electronic component of this invention (Claim 3) includes the process of forming a predetermined printed pattern by printing a conductive paste using the printed pattern forming material of Claim 1 or 2. It is a feature.

  In the printed pattern forming material of the present invention (Claim 1), one through hole to which a paste is supplied is disposed for one printed figure, and the area of the through hole is made smaller than the area of the printed figure. Since the longitudinal direction is parallel to the moving direction of the squeegee and the narrow part narrower than the other part is provided in the central part of the longitudinal direction, it is parallel to the longitudinal direction of the through hole. Even when screen printing is performed by moving the squeegee to the center, the amount of paste passing through the center of the through-hole is too large, and the center of the print pattern is wider than the target dimension. Can be prevented, and a printed pattern having a desired shape can be obtained.

  Moreover, like the printing pattern formation material of Claim 2, the width | variety of the narrow part of a through-hole is made into the range of 20 to 70% of the width | variety of another part, The width | variety of the center part of a printing pattern, It becomes possible to make it almost the same as other portions, and it becomes possible to form a print pattern having a shape and a size close to the target print pattern.

  Moreover, the manufacturing method of the electronic component of this invention (Claim 3) includes the process of forming a predetermined printed pattern by printing a conductive paste using the printed pattern forming material of Claim 1 or 2. It becomes possible to obtain a printed pattern having a target shape and dimensions. Therefore, for example, when the present invention is applied to a method for manufacturing a multilayer ceramic capacitor in which a printed pattern is an electrode pattern that serves as an internal electrode, a multilayer ceramic capacitor having a desired characteristic with little fluctuation in acquired capacitance is obtained. It becomes possible to manufacture stably. Therefore, according to the method for manufacturing an electronic component of the present invention (Claim 3), an electronic component manufactured through a process of forming a predetermined print pattern by printing a conductive paste can be efficiently performed without causing fluctuations in characteristics. It becomes possible to manufacture well.

  The features of the present invention will be described in more detail below with reference to examples of the present invention.

  FIG. 1 is a plan view showing a printed pattern forming material according to an embodiment (first embodiment) of the present invention, FIG. 2A is an enlarged view showing a main part of the printed pattern forming material of FIG. 2B is a cross-sectional view taken along the line bb of FIG. 2A, and FIG. 3 is a diagram showing a print pattern formed using the print pattern forming material of FIG.

[Configuration of printing pattern forming material]
As shown in FIGS. 1, 2 (a), and 2 (b), the printing pattern forming material 10 of the first embodiment is obtained by screen-printing a paste and printing patterns 11 having a predetermined shape (see FIGS. 3) is a printing pattern forming material used for forming a plurality of printed graphic parts (hereinafter simply referred to as “printed graphic”) 1 for printing in a predetermined shape through the paste. It is installed.

  Then, one through hole 2 to which a paste is supplied is provided for one printed figure 1.

  The through hole 2 has a smaller area than the printed figure 1 and is configured such that the longitudinal direction (the direction indicated by the arrow A in FIG. 2A) is substantially parallel to the moving direction of the squeegee.

  And the narrow part 2a whose width | variety is narrower than the other part (both ends 2b) is provided in the center part of the longitudinal direction of the through-hole 2. As shown in FIG.

In the first embodiment,
Width of printed figure 1 FW: 80 μm constant,
The length FL of the printed figure 1: constant 375 μm The width TW of both ends 2b of the through hole 2: constant 35 μm The length TL of the through hole 2: constant 260 μm, while the width NW of the narrow width portion 2a of the through hole and the penetration The length NL of the narrow portion 2a of the hole is
Width NW of narrow portion 2a of through hole: 5 to 33 μm
Length NL of narrow portion 2a of through hole: 20 to 150 μm
(See Table 1).

  For comparison, a printed pattern forming material (comparative example) was prepared in which a narrow portion was not provided in the central portion in the longitudinal direction of the through hole. In addition, the other structure of this printing pattern forming material for comparison is the same as that of the printing pattern forming material of Example 1 described above.

[Observation of printed figure of paste]
Using the printed pattern forming material configured as described above, a conductive paste was screen printed on the ceramic green sheet. In addition, as the conductive paste, a conductive paste for forming an internal electrode using Pd powder as a conductive component was used.

  In printing, while pressing the squeegee against the printing pattern forming material, the conductive paste is passed through the through-hole 2 by moving in the longitudinal direction of the through-hole 2 (the direction indicated by the arrow A in FIG. 1) on the ceramic green sheet. A printed figure having a predetermined shape is formed on the screen.

[Observation and evaluation of printed figures]
The printing pattern formed by performing screen printing as described above was observed and evaluated.
In Table 1, the width direction blur amount SW and the length direction blur amount SL are values of the width direction blur amount SW and the length direction blur amount SL measured for the print pattern 11 shown in FIG.

  As shown in Table 1, when the print pattern forming material of sample number 1 (print pattern forming material of the comparative example) in which the narrow width portion is not provided at the center portion of the through hole is used, the width direction bleeding amount SW of the print pattern is used. Was +35 μm, and the amount of bleeding SL in the length direction was +7 μm.

  On the other hand, in the case of using the printed pattern forming material of the present invention in which the narrow portion is provided in the central portion of the through hole, compared to the comparative example in which the narrow portion is not provided in the central portion of the through hole. It was confirmed that both the width direction bleeding amount SW and the length direction bleeding amount SL decreased.

  In particular, the influence of the width NW of the narrow width portion on the amount of bleeding SW in the width direction of the print pattern is large, and the narrow width portion NW is 20 to 70% of the width of the other part of the through hole (both ends in this embodiment). (Sample numbers 7 to 13 in Table 1), it is confirmed that the print pattern dimension is ensured to the target value (the dimension does not fall below the target value) while suppressing bleeding of the print pattern. It was.

  When the width NW of the narrow portion is less than 20% of the width of the other part of the through hole (both ends in this embodiment) as in the case of the sample number 14, the size of the print pattern is less than the target value. Although it does not deviate significantly, it was confirmed that the obtained print pattern was smaller than the target dimension.

Further, as in the case of sample numbers 2 to 6, when the width NW of the narrow width part exceeds 70% of the width of the other part of the through hole (both ends in this embodiment), the amount of bleeding of the print pattern is reduced. It was confirmed that the suppression effect was reduced.
Therefore, in this invention, it is preferable to make the width | variety of the narrow part of a through-hole into the range of 20 to 70% of the width | variety of another part.

  Further, as shown in Table 1, it was confirmed that the length NL of the narrow width portion did not have a great influence on the amount of bleeding of the print pattern. However, although not shown in Table 1, when the length NL of the narrow width portion is too long, a phenomenon that the obtained print pattern is less than the target dimension is recognized, and when it is too short, the effect of suppressing bleeding of the print pattern is obtained. A tendency to decrease was observed. Therefore, the length NL of the narrow portion is usually desirably in the range of 5% to 60% of the length of the through hole.

  As described above, by using the print pattern forming material of the present invention, even when the size of the print pattern is small, the screen pattern is accurately printed, and a print pattern close to the target size and shape is reliably formed. It becomes possible.

  Therefore, by using the printed pattern forming material of the present invention, it is possible to efficiently manufacture electronic components having stable characteristics. For example, a multilayer ceramic capacitor having a printed pattern that is an electrode pattern serving as an internal electrode. When the present invention is applied to a manufacturing method, it is possible to stably manufacture a monolithic ceramic capacitor having desired characteristics with little fluctuation in acquired capacitance.

  The invention of the present application is not limited to the above-described embodiment, and the shape and dimensions of the through hole and the narrow width portion, the specific shape and dimensions of the printed figure, the type of paste to be printed, etc. are within the scope of the invention. It is possible to add various applications and modifications.

As described above, in the present invention, one through-hole to which a paste is supplied is provided for one printed figure, and a narrow part narrower than the other part is provided in the central part in the longitudinal direction. When screen printing is performed by moving the squeegee parallel to the longitudinal direction of the through-hole, the amount of paste passing through the central portion of the through-hole is excessive, and the central portion of the print pattern is It is possible to obtain a print pattern having a desired shape by preventing the width from becoming larger than the target dimension.
Therefore, the present invention can be widely used in the industrial field relating to various electronic components manufactured through a process of printing internal electrodes and the like by screen printing.

It is a top view which shows the printing pattern formation material concerning one Example (Example 1) of this invention. (a) is a figure which expands and shows the principal part of the printing pattern formation material of FIG. 1, (b) is the bb sectional view taken on the line of FIG. 2 (a). It is a figure which shows the printing pattern formed using the printing pattern formation material concerning one Example of this invention. It is sectional drawing which shows the structure of a multilayer ceramic capacitor. (a) And (b) is a top view which shows the conventional printing pattern formation material, respectively. It is a figure which shows the other conventional printing pattern formation material, (a) is a top view, (b) is a perspective view which shows the principal part. (a) is a top view which shows the principal part of a printing pattern formation material, (b) is the bb sectional view taken on the line of (a). (a) is a figure which shows the shape of the target printing pattern, (b) is a figure which shows the printing pattern formed using the conventional printing pattern formation material.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Print figure 2 Through-hole 2a Narrow part of a through-hole 2b Both ends of a through-hole (parts other than a narrow part)
DESCRIPTION OF SYMBOLS 10 Print pattern formation material 11 Print pattern A Direction of movement of squeegee FW Width of printed figure FL Length of printed figure TL Length of through hole TW Width of both end portions of through hole NW Width of narrow portion of through hole NL Through hole Length of narrow part of SW SW bleed amount in width direction SL bleed amount in length direction

Claims (3)

A printing pattern forming material used for forming a printing pattern of a predetermined shape by screen printing a paste,
One through-hole to which paste is supplied is arranged for one printed figure,
The through-hole has a smaller area than the printed figure, the longitudinal direction is parallel to the moving direction of the squeegee, and has a narrow portion narrower than other portions in the central portion in the longitudinal direction. A printing pattern forming material characterized by.   The printed pattern forming material according to claim 1, wherein a width of the narrow portion of the through hole is in a range of 20 to 70% of a width of another portion.   A method for manufacturing an electronic component, comprising a step of forming a predetermined print pattern by printing a conductive paste using the print pattern forming material according to claim 1.

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