Metal mask for printing

Abstract

A printing metal mask is obtained, which makes the area of 1 to 3 columns of mesh holes arranged at the outer peripheral portion of a printing pattern smaller than the area of the mesh holes at the central portion, and reduces the saddle phenomenon. The printing metal mask has: a mask main body portion; a recess portion formed at the lower surface of the mask main body portion and recessed toward the upper surface of the mask main body portion; and a plurality of rhombic mesh holes formed within a printing pattern region of the mask main body portion, the plurality of mesh holes including: large rhombic mesh holes arranged at the central portion of the printing pattern region; small rhombic mesh holes at the outer peripheral portion, which are smaller in area than the large rhombic mesh holes; home-plate-shaped pentagonal mesh holes arranged at the outermost peripheral portion of the printing pattern region except for the corner portions and which are the same in area as the small rhombic mesh holes; and diamond-shaped pentagonal mesh holes arranged at the corner portions of the printing pattern region and which are the same in area as the small rhombic mesh holes.

Description

TECHNICAL FIELD

[0001] The present application relates to a printing metal mask for printing an internal electrode of a printed capacitor. BACKGROUND

[0002] In the past, a laminated ceramic capacitor has been manufactured by the steps of printing a conductive paste which becomes an internal electrode on a ceramic green sheet using a screen printing plate, laminating a plurality of the ceramic green sheets and performing firing, and then cutting the laminate. A plurality of internal electrodes are printed on a ceramic green sheet at one time, and a plurality of printing holes of the same shape are formed on the screen printing plate (for example, refer to Patent Document 1). In addition, in the case of performing screen printing, a phenomenon in which both ends of a printed pattern are raised to become saddle-shaped occurs, and thus in the case of laminating and pressure-bonding ceramic green sheets on which printed patterns are formed, the rate of poor withstand voltage increases, and thus in order to improve this problem, a printed pattern forming material which does not form a large rise at both ends of a printed pattern and forms a substantially flat printed pattern is known (refer to Patent Document 2). In addition, a mask having a mesh for opening a printed pattern is known, the mesh for opening a printed pattern has rhombic holes regularly formed at a central portion of a prescribed rectangular region, pentagonal holes including a portion of a side of a rhombus and a portion of a side constituting the rectangular region regularly formed at end portions (peripheral portions) of the rectangular region, home-base-shaped pentagonal holes formed at end portions other than corners (four corners) of the rectangular region, and diamond-shaped pentagonal holes formed at corners of the rectangular region (refer to Patent Document 3).

[0003] PRIOR ART DOCUMENTS

[0004] PATENT DOCUMENTS

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2001-39048

[0006] Patent Document 2: Japanese Patent Application Laid-Open No. 2005-212285

[0007] Patent Document 3: Japanese Patent No. 5395850 SUMMARY

[0008] PROBLEMS TO BE SOLVED BY THE INVENTION

[0009] In the printed pattern forming material or mask described in the past Patent Document 2 or Patent Document 3, with thinning of the mask and miniaturization of the mesh holes of the printed pattern for the purpose of printing thinner than ever, the phenomenon in which both ends of the printed pattern are raised to become saddle-shaped (the phenomenon in which the thickness of the conductive paste becomes thicker at the outer peripheral portion than at the inner portion) becomes apparent, and this problem becomes significant, and thus further reduction of the saddle-shaped phenomenon of the printed pattern in conjunction with the thinning of the mask and the miniaturization of the mesh holes of the printed pattern must be achieved.

[0010] The present invention has been achieved in order to solve the above-described problems, and provides a printing metal mask capable of making the area of 1 to 3 columns of mesh holes arranged in the outer peripheral portion of a printing pattern about 5 to 30% smaller than the area of mesh holes arranged in the central portion, thereby reducing a saddle phenomenon of the printing pattern accompanying thinning of the mask and miniaturization of the mesh holes of the printing pattern.

[0011] Means for solving the problems

[0012] The printing metal mask of the present invention for printing a paste has a flat plate-shaped mask main body portion having upper and lower surfaces parallel to each other, a recess portion formed on the surface of the mask main body portion on the side opposite to the object to be printed and recessed toward the upper surface of the mask main body portion, and a plurality of mesh holes formed in a printing pattern region formed on the upper surface of the mask main body portion, the plurality of mesh holes including: large rhombic mesh holes arranged in the central portion of the printing pattern region; small rhombic mesh holes arranged in the first to third columns of the outer peripheral portion of the large rhombic mesh holes and having mesh hole areas smaller than those of the large rhombic mesh holes; home-base-shaped pentagonal mesh holes arranged in the outermost peripheral portion of the printing pattern region except for the corner portions and having the same areas as those of the small rhombic mesh holes of the outer peripheral portion; and diamond-shaped pentagonal mesh holes arranged in the corner portions of the printing pattern region and having the same areas as those of the small rhombic mesh holes of the outer peripheral portion or mesh hole areas smaller than those of the small rhombic mesh holes of the outer peripheral portion or the home-base-shaped pentagonal mesh holes.

[0013] In addition, the plurality of mesh holes include: large rhombic mesh holes arranged in the central portion of the printing pattern region; small rhombic mesh holes arranged in the first to third columns of the outer peripheral portion of the large rhombic mesh holes and having mesh hole areas smaller than those of the large rhombic mesh holes; home-base-shaped pentagonal mesh holes arranged in the outermost peripheral portion of the printing pattern region except for the corner portions and having the same areas as those of the small rhombic mesh holes of the outer peripheral portion; and diamond-shaped pentagonal mesh holes arranged in the corner portions of the printing pattern region and having the same areas as those of the small rhombic mesh holes of the outer peripheral portion or mesh hole areas smaller than those of the small rhombic mesh holes of the outer peripheral portion or the home-base-shaped pentagonal mesh holes.

[0014] In addition, the small rhombic mesh holes having mesh hole areas smaller than those of the large rhombic mesh holes are arranged adjacent to either of at least left and right side end portions or either of at least upper and lower side end portions of the large rhombic mesh holes in the first to third columns in the longitudinal direction or the first to third columns in the lateral direction.

[0015] In addition, the plurality of meshes include: large rhombic meshes arranged in a plurality in a central portion of the printed pattern region; small and small-mouthed rhombic meshes smaller than the large rhombic meshes and arranged in a plurality in either one of at least left and right end portions or either one of at least upper and lower end portions in longitudinal direction 1 to 3 columns or in lateral direction 1 to 3 columns adjacent to the large rhombic meshes; home-plate-shaped pentagonal meshes arranged in either one of at least left and right side end portions and / or either one of at least upper and lower side end portions of the printed pattern region except for corner portions; and diamond-shaped pentagonal meshes arranged in the corner portions of the printed pattern region, having a mesh area smaller than that of the small and small-mouthed rhombic meshes or the home-plate-shaped pentagonal meshes or having the same mesh area as that of the small and small-mouthed rhombic meshes or the home-plate-shaped pentagonal meshes, and in a case where a mesh area of the large rhombic meshes is S1, a mesh area of the small and small-mouthed rhombic meshes is S2, a mesh area of the home-plate-shaped pentagonal meshes is S3, and a mesh area of the diamond-shaped pentagonal meshes is S4, a relationship of S1 > S2 ≈ S3 > S4 or S1 > S2 ≈ S3 ≈ S4 is established.

[0016] In addition, in a case where a mesh wire diameter of the large rhombic meshes is D1, a mesh wire diameter of the small and small-mouthed rhombic meshes is D2, a mesh wire diameter of the home-plate-shaped pentagonal meshes is D3, and a mesh wire diameter of the diamond-shaped pentagonal meshes is D4, a relationship of D1 < D2 ≈ D3 < D4 or D1 < D2 ≈ D3 ≈ D4 is established.

[0017] Effects of Invention

[0018] According to the present application, since the area of the 1 to 3 columns of meshes arranged in the outer peripheral portion of the printed pattern is made to be about 5% to 30% smaller than the area of the meshes arranged in the inner portion of the printed pattern, the saddle phenomenon of the printed pattern accompanying the thinning of the mask and the miniaturization of the meshes of the printed pattern can be significantly reduced. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a bottom view of a portion of a metal mask for printing in Example 1 of the present application.

[0020] Figure 2 is a cross-sectional view of the metal mask for printing shown in Figure 1 along line A-A, omitting a portion of the central portion.

[0021] Figure 3 is a cross-sectional view of the metal mask for printing shown in Figure 1 along line B-B, omitting a portion of the central portion.

[0022] Figure 4is a plan view of a portion of the printing metal mask in Example 1 of the present application, as viewed from above.

[0023] Figure 5 is a sectional view showing a printed pattern in a case where printing is performed using the printing metal mask in Example 1 of the present application.

[0024] Figure 6 is a sectional view showing a printed pattern in a case where printing is performed using a conventional printing metal mask as a comparative example.

[0025] Figure 7 is a bottom view of a portion of the printing metal mask in Example 2 of the present application, as viewed from below. DETAILED DESCRIPTION

[0026] Example 1.

[0027] Figure 1 is a bottom view of a portion of the printing metal mask in Example 1 of the present application, as viewed from below, Figure 2 is a sectional view along the A-A line of Figure 1 is a sectional view along the B-B line of Figure 3 is a plan view of a portion of the printing metal mask, as viewed from above, Figure 1 is a sectional view showing a printed pattern in a case where printing is performed using the printing metal mask, Figure 4 is a sectional view showing a printed pattern in a case where printing is performed using a conventional printing metal mask as a comparative example. Figure 5 Figure 6

[0028] ​​A printing metal mask 1 includes a mask body 2 having upper and lower surfaces parallel to each other, a recess 3 formed on a surface of the mask body 2 opposite to a printing object, and a plurality of mesh holes 5 having a rhombic base shape formed in a horizontal long rectangular printing pattern region 4 on the upper surface of the mask body 2. The mask body 2 is thin, having a thickness of about 10 to 25 μm, and the recess 3 is recessed toward the upper surface to a depth of about 1 to 5 μm. The recess 3 has a peripheral wall formed to surround the horizontal long rectangular printing pattern region 4, and the horizontal long rectangular printing pattern region 4 is formed inside the peripheral wall. In the illustrated example, the mask body 2, the recess 3, and the horizontal long rectangular printing pattern region 4 are arranged continuously in the up-down and left-right directions. Of the plurality of mesh holes 5 having a rhombic base shape formed in the horizontal long rectangular printing pattern region 4, large rhombic mesh holes 5a arranged in the central part of the printing pattern region 4 are arranged in 3 to 4 rows in the longitudinal direction and in 20 to 21 rows in the lateral direction, for a total of 143 holes, for example, with a mesh hole opening of about 19 to 25 μm and a mesh wire diameter D1 of about 16 to 10 μm. Smaller rhombic mesh holes 5b adjacent to the left and right ends of the large rhombic mesh holes 5a and smaller than the large rhombic mesh holes 5a are arranged in 4 rows in the longitudinal direction, for a total of 8 holes, for example, with a mesh hole opening of about 18 to 23 μm and a mesh wire diameter D2 of about 17 to 12 μm. The mesh hole area S1 is larger than the mesh hole area S2. The mesh wire diameter D1 is smaller than the mesh wire diameter D2. The smaller rhombic mesh holes 5b can be arranged in 2 or 3 rows in the longitudinal direction. Pentagonal mesh holes 5c arranged in the left and right end parts and the upper and lower end parts of the horizontal long rectangular printing pattern region 4 are arranged in 6 rows in the longitudinal direction and in 42 rows in the lateral direction, for a total of 48 holes, for example, with a mesh hole opening of about 18 to 23 μm and a mesh wire diameter D3 of about 17 to 12 μm. The mesh hole area S1 is larger than the mesh hole area S2 and the mesh hole area S3. The mesh wire diameter D1 is smaller than the mesh wire diameter D2 and the mesh wire diameter D3.In the plurality of mesh holes 5 in the rhombus-based shape formed in the horizontally long rectangular print pattern region 4, the diamond-shaped pentagonal mesh hole 5d arranged at each corner portion of the horizontally long rectangular print pattern region 4 has one arranged at each of the four corners in this embodiment, for example, a mesh opening of about 17 to 21 μm, and a mesh line diameter D4 of about 18 to 14 μm, but can be, for example, the same size as the home-base-shaped pentagonal mesh hole 5c, that is, a mesh opening of about 18 to 23 μm, and a mesh line diameter D4 of about 17 to 12 μm. Also, if the mesh hole area is assumed to be S4, the relationship of the mesh hole areas is S1 > S2 ≈ S3 > S4 or S1 > S2 ≈ S3 ≈ S4, which is a smaller mesh hole than the home-base-shaped pentagonal mesh hole 5c or a mesh hole of the same size as the home-base-shaped pentagonal mesh hole 5c. Also, the relationship of the mesh line diameters is D1 < D2 ≈ D3 < D4 or D1 < D2 ≈ D3 ≈ D4. In addition, the diamond-shaped pentagonal mesh hole 5d can not be arranged at all of the corner portions (four corners) of the horizontally long rectangular print pattern region 4, for example, can be arranged at two places (two corners) on the diagonal line.

[0029] In the plurality of mesh holes 5 in the rhombus-based shape formed in the horizontally long rectangular print pattern region 4, the diamond-shaped pentagonal mesh hole 5d arranged at each corner portion of the horizontally long rectangular print pattern region 4 has one arranged at each of the four corners in this embodiment, for example, a mesh opening of about 17 to 21 μm, and a mesh line diameter D4 of about 18 to 14 μm, but can be, for example, the same size as the home-base-shaped pentagonal mesh hole 5c, that is, a mesh opening of about 18 to 23 μm, and a mesh line diameter D4 of about 17 to 12 μm. Also, if the mesh hole area is assumed to be S4, the relationship of the mesh hole areas is S1 > S2 ≈ S3 > S4 or S1 > S2 ≈ S3 ≈ S4, which is a smaller mesh hole than the home-base-shaped pentagonal mesh hole 5c or a mesh hole of the same size as the home-base-shaped pentagonal mesh hole 5c. Also, the relationship of the mesh line diameters is D1 < D2 ≈ D3 < D4 or D1 < D2 ≈ D3 ≈ D4. In addition, the diamond-shaped pentagonal mesh hole 5d can not be arranged at all of the corner portions (four corners) of the horizontally long rectangular print pattern region 4, for example, can be arranged at two places (two corners) on the diagonal line. Figure 5 As shown in FIG. 6, the diamond-shaped pentagonal mesh hole 5d arranged at each corner portion of the horizontally long rectangular print pattern region 4 has one arranged at each of the four corners in this embodiment, for example, a mesh opening of about 17 to 21 μm, and a mesh line diameter D4 of about 18 to 14 μm, but can be, for example, the same size as the home-base-shaped pentagonal mesh hole 5c, that is, a mesh opening of about 18 to 23 μm, and a mesh line diameter D4 of about 17 to 12 μm. Also, if the mesh hole area is assumed to be S4, the relationship of the mesh hole areas is S1 > S2 ≈ S3 > S4 or S1 > S2 ≈ S3 ≈ S4, which is a smaller mesh hole than the home-base-shaped pentagonal mesh hole 5c or a mesh hole of the same size as the home-base-shaped pentagonal mesh hole 5c. Also, the relationship of the mesh line diameters is D1 < D2 ≈ D3 < D4 or D1 < D2 ≈ D3 ≈ D4. In addition, the diamond-shaped pentagonal mesh hole 5d can not be arranged at all of the corner portions (four corners) of the horizontally long rectangular print pattern region 4, for example, can be arranged at two places (two corners) on the diagonal line. Figure 6 As shown in FIG. 6, the diamond-shaped pentagonal mesh hole 5d arranged at each corner portion of the horizontally long rectangular print pattern region 4 has one arranged at each of the four corners in this embodiment, for example, a mesh opening of about 17 to 21 μm, and a mesh line diameter D4 of about 18 to 14 μm, but can be, for example, the same size as the home-base-shaped pentagonal mesh hole 5c, that is, a mesh opening of about 18 to 23 μm, and a mesh line diameter D4 of about 17 to 12 μm. Also, if the mesh hole area is assumed to be S4, the relationship of the mesh hole areas is S1 > S2 ≈ S3 > S4 or S1 > S2 ≈ S3 ≈ S4, which is a smaller mesh hole than the home-base-shaped pentagonal mesh hole 5c or a mesh hole of the same size as the home-base-shaped pentagonal mesh hole 5c. Also, the relationship of the mesh line diameters is D1 < D2 ≈ D3 < D4 or D1 < D2 ≈ D3 ≈ D4. In addition, the diamond-shaped pentagonal mesh hole 5d can not be arranged at all of the corner portions (four corners) of the horizontally long rectangular print pattern region 4, for example, can be arranged at two places (two corners) on the diagonal line.

[0030] Example 2

[0031] Figure 7 is a bottom view of a portion of the metal printing mask of Example 2 of the present application.

[0032] In the above-described embodiment 1, an example in which the small and small- mouthed rhombic mesh holes 5b are arranged in one column in the longitudinal direction adjacent to the both side end portions of the large rhombic mesh holes 5a arranged in the central portion was shown, but in this embodiment 2, the small and small- mouthed rhombic mesh holes 5b are additionally arranged in one column in the lateral direction adjacent to the both side end portions in the upper and lower directions in addition to the both side end portions of the large mesh holes 5a arranged in the central portion. In addition, the small and small- mouthed rhombic mesh holes 5b can also be arranged in two columns in the longitudinal direction or three columns in the longitudinal direction adjacent to either of the at least both side end portions and either of the at least both side end portions in the upper and lower directions. In addition, the area relationship of the mesh holes is in the relationship of S1 > S2 « S3 > S4 or S1 > S2 « S3 « S4 as in embodiment 1, and the wire diameter relationship is in the relationship of D1 < D2 « D3 < D4 or D1 < D2 « D3 « D4 as in embodiment 1.

[0033] Embodiment 3.

[0034] In the above-described embodiments 1 and 2, the printing metal mask having the plurality of mesh holes 5 in the rhombic basic shape formed in the printing pattern region 4 of the horizontally long rectangular shape on the upper surface side of the mask body portion 2 was described, but the shape of the plurality of mesh holes 5 is not limited to the rhombic shape, the parallelogram shape, the diamond shape, and can be, for example, a triangular shape, a quadrangular shape, other polygonal shape, a circular shape, and the like. In any case, by making the areas S2 to S4 of the small or small- mouthed mesh holes 5b to 5d arranged in the first to fourth columns of the outer peripheral portion of the printing pattern region 4 of the horizontally long rectangular shape about 5% to 30% smaller than the area S1 of the large mesh hole 5a arranged in the central portion, the phenomenon in which the both end portions of the printing pattern (conductive paste or the like) are raised to become a saddle shape accompanying the thinning of the mask and the mesh hole fining of the printing pattern can be avoided, and as long as the saddle phenomenon can be significantly reduced, some modifications can be made.

[0035] Explanation of Reference Numerals

[0036] 1: printing metal mask;

[0037] 2: mask body portion;

[0038] 3: horizontally long rectangular concave portion;

[0039] 4: horizontally long rectangular printing pattern region;

[0040] 5: plurality of mesh holes;

[0041] 5a: large rhombic mesh hole arranged in central portion;

[0042] 5b: small and small- mouthed rhombic mesh hole arranged in both side end portions or both side end portions in upper and lower directions;

[0043] 5c: Baseball-shaped pentagonal mesh;

[0044] 5d: Diamond-shaped pentagonal mesh.

Claims

1. A metal mask for printing, for printing a paste, characterized in that, The printing metal mask has: a flat mask body portion having upper and lower surfaces parallel to each other; a recess formed on the surface of the mask body portion opposite the printed object and recessed toward the upper surface of the mask body portion; and a plurality of rhombus-based mesh holes formed in a printing pattern area formed on the upper surface of the mask body portion, the plurality of mesh holes including: large rhombus mesh holes disposed in a central portion of the printing pattern area; small rhombus mesh holes disposed in a peripheral portion of the large rhombus mesh holes and having a mesh hole area smaller than that of the large rhombus mesh holes in the central portion; base pentagonal mesh holes disposed in an outermost peripheral portion of the printing pattern area other than a corner portion and having the same area as the small rhombus mesh holes in the peripheral portion; and diamond-shaped pentagonal mesh holes disposed in the corner portion of the printing pattern area and having a mesh hole area smaller than that of the large rhombus mesh holes in the central portion.

2. The printing metal mask according to claim 1, wherein the diamond-shaped pentagonal mesh holes have the same mesh hole area as the mesh hole area of the small rhombus mesh holes in the peripheral portion.

3. The printing metal mask according to claim 1 or 2, wherein the small rhombus mesh holes in the peripheral portion are disposed in one, two or three vertical columns adjacent to the left and right end portions of the large rhombus mesh holes and in one, two or three horizontal columns adjacent to the upper and lower end portions of the large rhombus mesh holes.

4. The printing metal mask according to claim 1 or 2, wherein the mesh hole area of the small rhombus mesh holes in the peripheral portion is 5 to 30% smaller than the mesh hole area of the large rhombus mesh holes.

5. The printing metal mask according to claim 3, wherein the mesh hole area of the small rhombus mesh holes in the peripheral portion is 5 to 30% smaller than the mesh hole area of the large rhombus mesh holes. ​

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