JP4400231B2 - Print pattern forming material and method of manufacturing electronic component using the same - Google Patents

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. 8, a multilayer ceramic capacitor, which is one of the typical multilayer ceramic electronic components, has a plurality of internal electrodes 3 a and 3 b facing each other with a ceramic layer 2 inside a ceramic element 1. The one end side is alternately drawn out to the end faces 5a and 5b on the different side of the ceramic element 1, and is electrically connected to the internal electrodes 3a and 3b on both end sides of the ceramic element 1. A pair of external electrodes 4a, 4b 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.

  By the way, when forming an internal electrode pattern by screen-printing a conductive paste on a ceramic green sheet, a plurality of through holes (openings) through which the conductive paste passes are arranged in a region corresponding to a predetermined print pattern. Screen printing masks are used.

  As a conventional screen printing mask, the printed figure portion has high durability, and improves the uniformity of the thickness of the thick film electrode formed by firing the printed pattern. For example, FIG. As shown in (a) (plan view) and FIG. 9 (b) (cross-sectional view taken along line bb in FIG. 9 (a)), a laminate in which a resin sheet 51 made of polyimide or a polyester sheet and a metal layer 52 are laminated. An opening 53 corresponding to the printing pattern is formed on the resin sheet, and the metal layer 52 is provided with a plurality of mesh-like or dot-like openings (triangular or substantially square openings) 54. A screen printing mask 60 has been proposed (Patent Document 1).

  However, in this screen printing mask, a triangular opening 54a (FIG. 9 (FIG. 9)) is formed in a part of the printing opening 55 formed by the opening 53 of the resin sheet 51 and the dot-like opening 54 of the metal layer 52. Since a)) is included, clogging occurs in the triangular opening 54a as the number of times of printing increases. Note that clogging of the triangular opening 54a usually occurs starting from a corner 65 having a small angle of the triangular opening 54a, as shown in FIG.

  When clogging occurs in the triangular opening 54a located on the outer peripheral edge of the printing opening 55, for example, a print pattern 61 before clogging as shown in FIG. As schematically shown in FIG. 11B, not only the printing unevenness of the outer peripheral portion of the printing pattern 61 is increased, but also the graphic area of the printing pattern 61 is reduced.

As a result, in the multilayer ceramic capacitor manufactured through the process of laminating the ceramic green sheets printed with the internal electrode pattern using the conventional screen printing mask, the effective area of the internal electrode is reduced and the capacitance value is reduced. There is a problem that it decreases.
Japanese Patent Laid-Open No. 11-42867

  The invention of the present application solves the above-described problems, and suppresses and prevents clogging in the through-hole to which the paste is supplied, and changes in the shape and area of the printed pattern even when the number of times of printing increases. An object of the present invention is to provide a printed pattern forming material that can be printed stably over a long period of time and a method for manufacturing an electronic component 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 for printing a paste so as to have a predetermined printing pattern by a screen printing method,
A plurality of through holes to which the paste is supplied are arranged for one printed figure,
The through hole arranged in the vicinity of a side of the printed figure that is substantially parallel to the moving direction of the squeegee (hereinafter referred to as “moving direction parallel side”) has a polygonal planar shape. The side closest to the moving direction parallel side is substantially parallel to the moving direction parallel side, and an internal angle formed by the side substantially parallel to the moving direction parallel side and the side in contact with the side is 90 ° or more. And each side other than the side substantially parallel to the side parallel to the moving direction has a predetermined angle with respect to the moving direction of the squeegee,
The other through-holes have a polygonal planar shape, and each side has a predetermined angle with respect to the moving direction of the squeegee ,
The through hole arranged close to the moving direction parallel side of the printed figure has the same shape as the other through hole, except that the portion covering the margin part in the vicinity of the moving direction parallel side is removed. And having an area smaller than that of other through holes .

Further, in the printed pattern forming material according to claim 2, the planar shape of the through hole arranged close to the parallel side in the movement direction of the printed figure is a pentagon, and the angles of the respective inner angles are 90 ° or more, In addition, the other through-holes are characterized in that the planar shape is substantially square, and the angle of each internal angle is approximately 90 °.

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

  The printed pattern forming material of the present invention (Claim 1) is configured so that a through hole to which a paste is supplied forms a single printed figure (a printed pattern having a predetermined shape by printing the paste). And a plurality of through holes arranged in the vicinity of the side of the printed figure that is substantially parallel to the moving direction of the squeegee (the side parallel to the moving direction) is a polygon. The side closest to the moving direction parallel side of the printed pattern of the through hole is made substantially parallel to the moving direction parallel side, and is formed by a side substantially parallel to the moving direction parallel side and a side in contact with the side. The inner angle is 90 ° or more, and each side other than the side substantially parallel to the side parallel to the moving direction has a predetermined angle with respect to the moving direction of the squeegee. Holes (especially clogging The shape and area of the printed pattern changes even when the number of times of printing is increased by suppressing and preventing clogging in the through-holes located close to the parallel sides in the moving direction. It becomes possible to suppress and prevent, and to perform stable printing over a long period of time.

  Further, with respect to other through holes other than the through holes arranged close to the side parallel to the moving direction, the planar shape is made polygonal, and each side has a predetermined angle with respect to the moving direction of the squeegee. Therefore, when screen printing is performed by moving the squeegee, stable screen printing can be performed without preventing stable operation.

  That is, the plane shape of the through hole arranged close to the moving direction parallel side of the printed figure is a polygon, and the side closest to the moving direction parallel side of the through hole is substantially parallel to the moving direction parallel side. In addition, by setting the angle of the inner angle formed by the parallel side and the side in contact with the side to be 90 ° or more, when the paste is printed, it corresponds to the portion that becomes the outer peripheral portion of the print pattern. It becomes possible to prevent the formation of an acute inner angle, which is likely to cause paste clogging, in the portion of the through hole close to the side parallel to the moving direction. It is possible to efficiently suppress and prevent the shape and area from changing.

In addition, the planar shape of the through hole placed close to the parallel side of the printed figure in the moving direction is the same shape as the other through holes, but the shape of the margin part near the parallel side of the moving direction is removed. Since the area is smaller than the area of other through-holes, it is easy and reliable that the clogging of the paste is likely to occur in the part of the through-holes close to the parallel side in the moving direction. It is possible to reliably suppress and prevent the shape and area of the print pattern from changing even when the number of times of printing is increased.

Further, as in the printed pattern forming material according to claim 2 , the planar shape of the through hole arranged in the vicinity of the parallel side in the moving direction of the printed figure is a pentagon, and the angle of each inner angle is 90 ° or more. At the same time, the other through-holes have a substantially square plan shape, and the angles of the inner angles are all about 90 °, so that clogging of the paste is likely to occur in the portions of the through-holes close to the parallel sides in the movement direction. While preventing the formation of an acute inner angle, it becomes possible to secure a sufficient amount of paste to be supplied per plane area, and the present invention can be made more effective.

  That is, for example, as shown in FIG. 1, the planar shape of the central through hole 1 (1b) is a square (substantially square), and the angles of the sides 21, 22, 23, and 24 with respect to the movement direction A of the squeegee The through hole 1 (1a) disposed on the both sides of the printed figure 2 and in the vicinity of the side substantially parallel to the moving direction of the squeegee (side parallel to the moving direction) 3 has a basic shape at the center. The side 11 defined by the margin portion 4 is the same as the planar shape of the through hole 1 (1b), except that the portion of the through hole 1 (1b) that covers the margin portion 4 near the movement direction parallel side 3 is removed. 3 is substantially pentagonal, the internal angles X and Y formed by the side 11 substantially parallel to the moving direction parallel side 3 and the side 12 or 13 in contact with the side 11 are larger than 90 °, Mark that the other interior angle is about 90 ° The pattern forming material 10 can be configured, and the paste supply amount per plane area can be sufficiently secured while preventing the formation of an acute inner angle that is likely to cause clogging of the paste. In addition, it is possible to obtain a highly reliable printed pattern forming material.

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. Even when the number of times of printing increases, the change in the shape and area of the printing pattern is suppressed and prevented. 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 electronic component manufacturing method 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 used 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 main part of a printed pattern forming material 10 according to an embodiment of the present invention.
The printed pattern forming material 10 is a metal mask (metal mask printed pattern forming material), and a plurality of through holes 1 to which paste is supplied are arranged for one printed figure 2. In FIG. 1, only one printed figure is shown, but a large number of printed figures 2 are formed in a matrix on the actual print pattern forming material 10.
And the through-hole 1 (1a) arrange | positioned adjacent to the edge | side parallel to the moving direction A of squeegee (henceforth "moving direction parallel edge") 3 of the both sides of the printed figure 2 is a pentagonal planar shape. The side 11 closest to the moving direction parallel side 3 (side defined by the margin portion 4 in this embodiment) 11 is formed substantially parallel to the moving direction parallel side 3. Further, the interior angles X and Y formed by the side 11 substantially parallel to the moving direction parallel side 3 and the sides 12 and 13 in contact with the side 11 are configured so that the angle is 90 ° or more. The sides 12, 13, 14, 15 other than the side 11 substantially parallel to the moving direction parallel side 3 are configured to have a predetermined angle (45 ° in this embodiment) with respect to the moving direction A of the squeegee. Yes.

  The other through-holes (through holes in the center of the printed pattern 2) 1 (1b) other than the through-holes 1 (1a) arranged close to the moving direction parallel side 3 have a square shape (substantially) Each side 21, 22, 23, 24 is configured to have a predetermined angle (45 ° in this embodiment) with respect to the moving direction of the squeegee.

  That is, in this printed pattern forming material 10, the through holes 1 (1 a) arranged close to the movement direction parallel sides 3 on both sides of the printed figure 2 are substantially the same square as the other through holes 1 (1 b). From this shape, a pentagonal shape is obtained by removing a portion related to the margin portion 4, and the area is smaller than the area of the other through-hole 1 (1b).

  In the printed pattern forming material 10 configured in this way, the planar shape of the through-hole 1 (1a) arranged close to the movement direction parallel side 3 is a polygon, and the side closest to the movement direction parallel side ( (Side defined by the margin portion 4) 11 is made substantially parallel to the moving direction parallel side 3, and the inner angles X and Y formed by the parallel side 11 and the sides 12 and 13 in contact with the side 11 are 90. Therefore, when the paste is printed, the portion of the through hole 1 (1a) corresponding to the outer peripheral portion of the print pattern is close to the portion 3 near the parallel side 3 in the moving direction. It is possible to prevent formation of an acute inner angle that is likely to be clogged. Therefore, even when the number of times of printing increases, it is possible to suppress and prevent the change in the shape and area of the print pattern, and to perform stable printing over a long period of time.

In addition, when 50,000 screen printings are performed using the printing pattern forming material 10, the printing pattern 5 when the printing pattern forming material 10 is new and the printing after performing 50,000 screen printings. Pattern 5 is shown in FIGS. 2 (a) and 2 (b).
As shown in FIGS. 2A and 2B, the printing pattern 5 when the printing pattern forming material 10 is new (FIG. 2A) and the printing pattern after 50,000 screen printings are performed. 5 (FIG. 2 (b)) showed almost no difference.

  For comparison, as shown in FIG. 3, through-holes 1 (1a) disposed on both sides of the printed figure 2 in the vicinity of the side parallel to the movement direction A of the squeegee (side parallel to the movement direction) 3 are shown. The plane shape is a triangle, and the side (defined by the margin portion 4) 11 closest to the moving direction parallel side 3 is substantially parallel to the moving direction parallel side 3, and the other shapes are as described above. A print pattern forming material 10a of a comparative example similar to the print pattern forming material 10 of Example 1 is produced, and screen printing is performed 50,000 times using the print pattern forming material 10a of this comparative example to form a new print pattern. The printing pattern when using the material 10a and the printing pattern after 50,000 screen printings were examined. In FIG. 3, the parts denoted by the same reference numerals as those in FIG. 1 are the same or corresponding parts.

FIG. 4A is a diagram showing a print pattern 5 when a print pattern forming material 10a of a new comparative example is used, and FIG. 4B shows the print pattern 5 after 50,000 screen printings. FIG.
As shown in FIGS. 4A and 4B, the print pattern forming material 10a after the screen printing is performed 50,000 times as compared with the print pattern 5 when the print pattern forming material 10a is new (FIG. 4A). In the printing pattern 5 (FIG. 4B), it was confirmed that remarkable printing unevenness was recognized in the outer peripheral portion 5a and that the area of the printing pattern 5 was greatly reduced.

  In Table 1, when the internal electrode pattern was printed using the printing pattern forming material 10 of Example 1 and the printing pattern forming material 10a of the comparative example, the initial printing and 50,000 screen printings were performed. The change of the area of a subsequent internal electrode pattern (printing pattern) is shown.

  Furthermore, while stacking the electrode printing sheet which formed the internal electrode pattern by printing the internal electrode pattern using the printing pattern forming material 10 of Example 1 and the printing pattern forming material 10a of the comparative example, the upper and lower sides thereof Laminate prepared by laminating a predetermined number of ceramic green sheets with no internal electrode pattern formed thereon, pressure bonding, cutting at predetermined positions, dividing into individual elements, firing, and forming external electrodes The ceramic capacitor (number of laminated internal electrodes: 30 sheets, average value of acquired capacitance: 150 pF) was investigated. When the ceramic green sheet at the initial stage of printing was used, and after 50,000 screen printings, the internal electrode When using a ceramic green sheet printed with a pattern, the average capacitance value and the capacitance defect rate Engaged are shown in Table 1.

As shown in Table 1, when screen printing was performed using the print pattern forming material 10a of the comparative example, the initial print pattern and the area of the print pattern after 50,000 screen printings were 0 It was confirmed that the capacitance average value decreased from 182 mm ² to 0.176 mm ² , and the capacitance defect rate increased accordingly.

On the other hand, when screen printing is performed using the printing pattern forming material 10 of Example 1, the area of the initial printing pattern and the printing pattern after 50,000 screen printings are both 0. It is confirmed that there is no change at 180 mm ² and correspondingly, the average value of the acquired capacitance is only slightly decreased, and the capacitance defect rate is only slightly increased. It was done.

FIG. 5 shows a cross-sectional view of a printing pattern (internal electrode pattern) 5 at the initial printing stage when screen printing is performed using the printing pattern forming material 10 of Example 1, and FIG. 5 shows the printing pattern forming material of the comparative example. FIG. 6 is a cross-sectional view of a printing pattern (internal electrode pattern) 5 at the initial printing stage when screen printing is performed using 10a.
As shown in FIG. 6, when screen printing was performed using the printing pattern forming material 10a of the comparative example, a phenomenon that both ends of the printing pattern 5 were raised and became saddle-shaped occurred. When the printing pattern forming material 10 of Example 1 was used, it was confirmed that large bulges were not formed at both ends, and a substantially flat printing pattern 5 was obtained.

  In addition, when screen printing is performed using the printing pattern forming material 10a of the comparative example, a phenomenon occurs in which both ends of the printing pattern 5 rise and become saddle-like, and therefore a ceramic green sheet on which the printing pattern is formed is laminated. When the pressure bonding was performed, the breakdown voltage failure rate was as high as 8.6%. However, when screen printing was performed using the printing pattern forming material 10 of Example 1, large bulges were not formed at both ends, and the surface was almost flat. Since the printed pattern 5 is obtained, it is confirmed that the defective rate of breakdown voltage is as low as 0.8% when the ceramic green sheets on which the printed pattern is formed are laminated and pressure-bonded, and good results are obtained.

FIG. 7 is a plan view showing the main part of a printed pattern forming material 20 according to an embodiment (Example 2) of the invention to which the present invention relates.
The printed pattern forming material 20 of the second embodiment is also a metal mask (metal mask printed pattern forming material) similar to that of the first embodiment, and the printed pattern forming material 20 also has a through-hole to which a paste is supplied. A plurality of 1 are arranged for one printed figure 2. In FIG. 7, only one printed figure 2 is shown, but a large number of printed figures 2 are formed in a matrix on the actual print pattern forming material 20.

  Further, the planar shape of the through-hole 1 is a polygon (in this embodiment, substantially square) with each internal angle being approximately 90 °, and each through-hole 1 has the same shape and includes a plurality of through-holes. The line L connecting 1 has a predetermined angle (45 ° in this embodiment) with respect to the moving direction A of the squeegee.

The printed pattern forming material 20 of Example 2 configured as described above is provided with a plurality of through holes 1 to which a paste is supplied with respect to one printed figure 2, and the planar shape of the through holes 1 The inner angle is approximately 90 °, and each through hole 1 has the same shape, and the line L connecting the plurality of through holes 1 has an angle of 45 ° with respect to the moving direction A of the squeegee. Therefore, it is possible to prevent the formation of an acute inner angle, which is likely to cause paste clogging, in the portion of the through hole 1 corresponding to the outer peripheral portion of the printed pattern, which is close to the parallel side in the moving direction. Even when the number of times of printing increases, it is possible to suppress and prevent changes in the shape and area of the print pattern, and it is possible to perform stable printing over a long period of time.
It has been experimentally confirmed that the printed pattern forming material of Example 2 can achieve the same effects as the printed pattern forming material of Example 1.

  As described above, by using the printed pattern forming material of the invention of the present application, the through holes to which the paste is supplied (especially through holes arranged close to the parallel side in the moving direction, where clogging tends to be a problem) are observed. Even when the number of times of printing is increased by suppressing and preventing clogging, there is little change in the shape and area of the print pattern, and stable printing can be performed over a long period of time.

  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.

In addition, although the said Example demonstrated using the metal mask printing pattern formation material which consists only of a metal layer, this invention is not limited to the said Example, For example, like patent document 1, a metal layer and The present invention can also be applied to a printing pattern forming material that is a combination of resin sheets.
The invention of the present application is not limited to the above-described embodiment in other points as well, and the specific shape of the through hole, the arrangement mode, the number of arrangement, the specific shape of the printed pattern forming material, and the printing should be performed. Various types of application and modifications can be made within the scope of the invention with respect to the type of paste.

As described above, according to the present invention, an acute inner angle that is likely to cause paste clogging is formed in the portion of the through hole that is close to the parallel side in the movement direction, corresponding to the outer peripheral portion of the print pattern. Therefore, even when the number of times of printing increases, it is possible to suppress and prevent changes in the shape and area of the print pattern, and to perform stable printing over a long period of time.
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 principal part of the printing pattern formation material concerning one Example of this invention. (a) is a figure which shows typically the printing pattern obtained when screen printing is performed using the new printing pattern formation material concerning one Example of this invention, (b) is a screen printing of 50,000 times. It is a figure which shows typically the printing pattern after performing. It is a top view which shows the principal part of the printing pattern formation material of a comparative example. (a) is a figure which shows typically the printing pattern obtained when screen printing is performed using the new printing pattern formation material of a comparative example, (b) is after 50,000 times of screen printing. It is a figure which shows a printing pattern typically. It is sectional drawing which shows the printing pattern of the printing initial stage obtained when screen printing is performed using the printing pattern formation material of Example 1. FIG. It is sectional drawing which shows the printing pattern of the printing initial stage obtained when screen printing is performed using the printing pattern formation material of a comparative example. It is a top view which shows the principal part of the printing pattern formation material concerning the Example (Example 2) of the invention with which this invention relates. It is sectional drawing which shows the structure of a multilayer ceramic capacitor. (a) is a top view which shows the conventional screen printing mask, (b) is the bb sectional view taken on the line bb which shows the cross section of the conventional screen printing mask. It is a figure for demonstrating the generation | occurrence | production state of clogging in the triangular opening part of the screen printing mask of FIG. (a) is a figure which shows typically the printing pattern before clogging generate | occur | produces, (b) is a figure which shows typically the printing pattern after clogging generate | occur | produced.

DESCRIPTION OF SYMBOLS 1 (1a) Through-hole arrange | positioned close to a moving direction parallel side 1 (1b) Through-hole of a center part 2 Print figure 3 Moving direction parallel side 4 Margin part 5 Print pattern 5a Peripheral part of a print pattern 10,20 Printing Pattern forming material 10a Print pattern forming material of comparative example 11 Side closest to movement direction parallel side 12,13 Side contacting side parallel to movement direction parallel side 14,15 Other than side substantially parallel to movement direction parallel side Sides 21, 22, 23, 24 Each side of the through hole at the center A A moving direction of the squeegee X, Y Inner angle of the through hole L Line connecting the through holes

Claims (3)

A printing pattern forming material for printing a paste so as to have a predetermined printing pattern by a screen printing method,
A plurality of through holes to which the paste is supplied are arranged for one printed figure,
The through hole arranged in the vicinity of a side of the printed figure that is substantially parallel to the moving direction of the squeegee (hereinafter referred to as “moving direction parallel side”) has a polygonal planar shape. The side closest to the moving direction parallel side is substantially parallel to the moving direction parallel side, and an internal angle formed by the side substantially parallel to the moving direction parallel side and the side in contact with the side is 90 ° or more. And each side other than the side substantially parallel to the side parallel to the moving direction has a predetermined angle with respect to the moving direction of the squeegee,
The other through-holes have a polygonal planar shape, and each side has a predetermined angle with respect to the moving direction of the squeegee ,
The through hole arranged close to the moving direction parallel side of the printed figure has the same shape as the other through hole, except that the portion covering the margin part in the vicinity of the moving direction parallel side is removed. And a printed pattern forming material, characterized in that the printed pattern forming material is smaller than the area of other through holes . The planar shape of the through-holes arranged close to the parallel sides in the moving direction of the printed figure is a pentagon, the angles of the inner angles are each 90 ° or more, and the other through-holes have a substantially square planar shape. The printed pattern forming material according to claim 1 , wherein each inner angle is approximately 90 °. Method of manufacturing an electronic component which comprises a step of forming a predetermined printing pattern by printing a conductive paste with claim 1 or 2 print pattern forming material according.

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