JP2006334957A - Screen printing plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a screen printing plate with such advantages that a master can be easily manufactured and a successful printing can be ensured. <P>SOLUTION: Through holes 14, 15 and 16 are formed in a figure forming region of an almost rectangular shape, are formed. The first through hole 14 is almost rhombic in cross-section with all the sides extending obliquely to each side of the figure forming region and a direction connecting the mutually opposite apices being almost in parallel with or almost at right angles to the sides of the figure forming region. In addition, the entirety of the first through hole 14 is arranged inside the figure forming region. The second through holes 15 and 16 represent two division parts by one side or two sides of the figure forming region of the likewise of an almost rhombic shape, with a cross-section shaped like the part of the figure forming region, and are arranged near each side of the figure forming region. Each through hole 14, 15 and 16 are arranged at an equal interval so that their sides are roughly aligned in a straight line, and thus, mesh line parts 17 and 18 of almost a specified width which extend obliquely at an approximately equal interval to the side of the figure forming region and intersecting each other, are formed between the through holes 14, 15 and 16. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a screen printing plate, and more particularly to a screen printing plate used for forming a printed matter of a predetermined figure on a substrate in the manufacture of an electronic component.

  In the field of electronic components, for example, screen printing is used to obtain a fine and thin electrode figure having a predetermined shape as an internal electrode of a chip component. In a screen printing plate used in screen printing, fine through-holes through which paste passes are formed in a graphic forming area corresponding to a graphic pattern of a predetermined shape. Screen printing plates require high dimensional accuracy for printing area control and high thickness accuracy for printing coating thickness control.

  In the field of electronic components, for example, the screen printing plate 1 shown in FIG. 1 is used. This screen printing plate 1 has a first mesh-like metal film in which fine through holes having a circular opening 2 having a circular planar shape are formed on one main surface 1a side, and a shape slightly larger than a printed pattern figure. The second metal film in which the printing holes 3 are formed is integrally formed by metal plating. For example, the inner laminated portion of the multilayer ceramic component is obtained by printing a conductive paste serving as an internal electrode on the ceramic green sheet using the screen printing plate 1, laminating a plurality of the ceramic green sheets, and firing them. Are manufactured by cutting them individually. At this time, a plurality of internal electrodes are printed at once on the ceramic green sheet, and a large number of printing holes 3 having the same shape are formed in the screen printing plate 1 (see, for example, Patent Document 1).

The screen printing plate integrally formed with metal plating in this way can be manufactured using electroforming (electroforming) technique, has excellent printing durability, and the plate thickness can be freely set by controlling the amount of plating. can do.
JP 2001-39048 A

  In the conventional screen printing plate, through-holes having the same shape or the same area are arranged in a figure forming region that matches the figure to be printed. Therefore, in conventional screen printing plates, when printing a thin film of internal electrodes of multilayer ceramic parts that have recently been miniaturized, paste is ejected from through holes arranged along the sides of the figure forming area. The amount increases, resulting in printing blurring and deterioration of printed linearity. In order to improve this, if the through-holes are made smaller, the through-holes become finer and the number increases, so the yield of the screen printing plate deteriorates and paste paste clogging occurs during printing. It becomes easy. That is, the improvement of the linearity of the printed figure is not compatible with the prevention of clogging and printing blurring.

  Therefore, a relatively large area of the through hole is arranged in the center of the graphic forming area of the screen printing plate to suppress clogging of the through hole and print blurring, while the periphery of the graphic portion is relatively It is conceivable to arrange a through-hole having a small area to suppress the paste discharge amount, prevent printing blurring, and ensure printing linearity.

  However, with such a complicated method for arranging the through holes, the burden of data processing and original drawing is large and the productivity is not good when producing the original necessary for forming the screen printing plate. Not right.

  In view of such circumstances, the present invention is intended to provide a screen printing plate that is easy to produce an original plate and can perform good printing.

  In order to solve the above problems, the present invention provides a screen printing plate configured as follows.

  The screen printing plate includes a plate-like main body portion having main surfaces parallel to each other, and a plurality of through holes penetrating between the main surfaces in a substantially rectangular figure forming region when seen through from the vertical direction of the main surfaces. Is formed, and one of the main surfaces facing the printing material is of a type in which a concave portion is formed in the figure forming region and its periphery. The through hole includes a first through hole and a second through hole. When the first through hole is seen through from the vertical direction of the main surface, all the sides extend obliquely with respect to each side of the figure forming area, and the direction connecting the opposing vertices is the figure forming The region has a substantially rhombic cross-sectional shape that is substantially parallel to or substantially perpendicular to the side of the region, and is entirely disposed within the figure forming region. When the second through-hole is seen through from the direction perpendicular to the main surface, all the sides extend obliquely with respect to each side of the figure forming area, and the direction connecting the opposing vertices forms the figure. Of the two parts divided by the one or two sides of the graphic forming region, the substantially rhombus that is substantially parallel to or substantially perpendicular to the side of the region has the cross-sectional shape of the part in the graphic forming region , Arranged in the vicinity of each side of the figure forming area. The first through hole and the second through hole are generally arranged at equal intervals so that the respective sides are aligned on a straight line. When seen through from the vertical direction of the main surface, the figure forming area has a substantially constant width that extends obliquely at substantially equal intervals and intersects the sides of the figure forming area between the through holes. The mesh line portion is formed.

  In the above configuration, a relatively large first through-hole of a substantially rhombus surrounded by an oblique mesh line portion is formed at the center of the substantially rectangular figure forming area, and around the substantially rectangular figure forming area. A relatively small second through-hole is formed in which the approximately rhombus is divided by the sides of the figure forming region.

  According to the said structure, clogging and printing blur can be reduced by making the 1st through-hole arrange | positioned in the center of a figure area | region into a substantially rhombus. A printing edge can be sharpened along the side of the figure forming area by the second through-holes that are arranged around the figure area and have a cross-sectional shape into which a substantially rhombus is divided.

  According to the above configuration, when the original plate used to form the through holes of the screen printing plate is created, the shape and arrangement of the through holes of the screen printing plate are defined by straight lines, so that data processing becomes simple and data The processing amount can be reduced and the drawing time can be shortened. Moreover, the design of the screen printing plate can be simplified by defining the through-holes with mesh line portions obliquely intersecting the sides of the figure forming area.

  Preferably, an angle formed between a direction perpendicular to the squeegee direction and the mesh line portion is 30 degrees or more and 55 degrees or less when seen through the main surface from a perpendicular direction. When viewed through the main surface from a vertical direction, the area of the second through hole is 30% or more and 60% or less of the area of the first through hole.

  In the above configuration, when the angle formed between the direction perpendicular to the squeegee direction and the mesh line portion is 30 degrees or more and 55 degrees or less, clogging or printing fading in the through hole can be eliminated, and the second penetration By setting the cross-sectional area of the hole to 30% or more and 60% or less of the cross-sectional area of the first through hole, the linearity of the print pattern can be ensured. The above configuration can be suitably applied to all printed figure sizes and to paste types having different viscosities.

  According to the screen printing plate of the present invention, it is easy to produce an original plate and good printing can be performed.

  Hereinafter, examples of the present invention will be described with reference to FIGS.

  FIG. 2A is a main part plan view showing a part of the screen printing plate 10. FIG. 2B is a cross-sectional view of the main part taken along the line BB in FIG.

  As shown in FIG. 2, the screen printing plate 10 has a recess 12 and mesh holes 14, 15, 16 formed in a flat plate-like main body 11 having main surfaces 11 a, 11 b parallel to each other. The main body 11 of the screen printing plate 10 is held by a frame (not shown), and is used for printing internal electrodes on a ceramic green sheet such as a multilayer chip capacitor.

  The concave portion 12 is formed on one main surface 11a of the main body 11 of the screen printing plate 10, and is a substantially rectangular figure having dimensions X and Y when viewed from a direction (normal direction) perpendicular to the main surfaces 11a and 11b. Formed in and around the formation region. That is, the side walls 12x and 12y of the recess 12 are formed so as to surround the figure forming region.

  The mesh holes 14, 15, 16 penetrate between the bottom surface 12 s of the recess 12 and the other main surface 11 b of the main body 11. As shown in FIG. 2A, a plurality of mesh holes 14 having the same shape are arranged in the center of a substantially rectangular figure forming region having dimensions X and Y when viewed from the direction perpendicular to the main surfaces 11a and 11b. Then, mesh holes 15 are arranged at the corners of the substantially rectangular figure forming area, and mesh holes 16 are arranged at the portions other than the corners along the sides of the substantially rectangular figure forming area.

  The mesh hole 14 disposed in the center of the substantially rectangular figure forming region has a substantially rhombic cross-sectional shape when viewed from a direction perpendicular to the main surfaces 11a and 11b, and all sides are each side of the figure forming region. The direction connecting the vertices extending obliquely with respect to each other is substantially parallel or substantially perpendicular to the side of the figure forming region.

  The mesh holes 15 and 16 arranged around the substantially rectangular figure forming region are substantially diamond-shaped (that is, all sides are figures) substantially matching the mesh hole 14 when viewed from the direction perpendicular to the main surfaces 11a and 11b. 1 or 2 sides of the figure forming area are the rhombuses extending obliquely with respect to each side of the forming area and the direction connecting the opposing vertices being substantially parallel or substantially perpendicular to the side of the figure forming area) Of the two divided parts, it is a part included in the figure forming region and has a substantially triangular or substantially pentagonal cross-sectional shape. That is, when viewed from the direction perpendicular to the main surfaces 11a and 11b, the mesh holes 15 and 16 are arranged so that the substantially rhombic dividing lines overlap the sides of the figure forming region.

  The mesh holes 14, 15, and 16 are generally arranged at equal intervals so that the sides of the approximately rhombus are aligned on a straight line. As a result, when viewed from the direction perpendicular to the main surfaces 11a and 11b, the figure forming region extends between the mesh holes 14, 15, and 16 at an approximately equal interval obliquely with respect to the sides of the figure forming region. Existing and intersecting belt-shaped mesh line portions 17 and 18 having a substantially constant width are formed.

  FIG. 3 is an enlarged perspective view of a main part for explaining a state when the screen printing plate 10 is used and printing is performed by the squeegee 40.

  In the screen printing plate 10, one main surface 11 a on which the concave portion 12 of the main body 11 is formed is placed on the surface 46 a of the substrate 46. In this state, the squeegee 40 moves in the direction of the arrow 42 while being in contact with the other main surface 11 b of the main body 11 of the screen printing plate 10. At this time, the squeegee 40 moves while pressing a paste (not shown) disposed on the other main surface 11b of the main body 11 of the screen printing plate 10. The paste pushed by the squeegee 40 is pushed out from the mesh holes 14 and 16 onto the surface 46 a of the substrate 46 as indicated by the arrow 43, and the mesh holes 14 and 16 are formed on the surface 46 a of the substrate 46. A printed pattern figure 44 corresponding to the figure-forming area thus formed is formed. The printed pattern figure 44 is slightly larger than the figure forming area due to the spread of the paste.

  At this time, the recess 12 formed on one main surface 11a of the main body 11 of the screen printing plate 10 is larger than the print pattern graphic 44, and the print pattern graphic 44 and the side wall 12x of the recess 12 (not shown in FIG. 3). ), 12y, an interval is provided.

  The substantially rhombic mesh hole 14 disposed in the center of the figure forming area supplies a paste that forms the inner part of the printed pattern figure 44. Since the mesh hole 14 has a sufficient opening area for discharging the paste, an appropriate amount of paste necessary for filling the paste into the inner portion of the printed pattern figure 44 can be supplied. Therefore, it is possible to obtain a predetermined print pattern shape 44 that is free from printing blemishes and blurring.

  On the other hand, the mesh holes 16 having a cross-sectional shape obtained by dividing a substantially rhombus arranged around the figure forming region supply paste for forming a portion near the edge of the printed pattern figure 44. The mesh hole 16 is smaller than the center mesh hole 14 and the discharge amount of the paste that forms the vicinity of the edge of the printed pattern figure 44 is limited. Therefore, since the paste more than necessary that causes printing blur is not ejected, the printed pattern figure 44 can be formed into a printed shape with extremely excellent linearity.

  Next, an example of a method for manufacturing the main body 11 of the screen printing plate 10 will be described with reference to FIG.

  As shown in FIG. 4 (A), a photoresist is applied on the substrate 20, exposed using an original plate for producing a screen printing plate, developed with photoresist, and mesh holes 14, 15, 16 (FIG. 2). And a resist image 22 having a pattern corresponding to the inside of the inside (see FIG. 3).

  Next, as shown in FIG. 4B, a metal film 30 is formed on the substrate 20 by electroforming (electroforming) via the resist image 22. For example, nickel is used as the plating material. The film thickness of the metal film 30 is, for example, 10 to 100 μm. As the plating bath at this time, for example, a nickel sulfamate bath that can easily control the internal stress of the plating film that affects the dimensions of the plating film is used.

  Next, as shown in FIG. 4C, a photoresist is applied on the resist image 22 and the metal film 30, exposed and developed, and the recesses 12 slightly larger than the printed pattern figure 44 (see FIG. 3) ( A resist image 24 corresponding to the inside of FIG. 2 and FIG. 3 is formed.

  Next, as shown in FIG. 4D, a metal film 32 is formed on the metal film 30 by electroforming (electroforming) through the resist image 24. For example, nickel is used as the plating material. The film thickness of the metal film 32 is, for example, 1 to 100 μm. As the plating bath at this time, for example, a nickel sulfamate bath is used.

  Next, as shown in FIG. 4 (D), the resist images 22 and 24 are removed using, for example, a solvent to form concave portions 12 and mesh holes 14 and 15 (not shown in FIG. 3) and 16, which are integrated. The remaining metal films 30 and 32 are removed from the substrate, and the main body 11 is completed.

By the way, as shown in FIG. 2, the pitch PY in the squeegee direction and the pitch PX in the direction perpendicular to the squeegee direction of the substantially rhombic mesh hole 14 arranged at the center of the figure formation area are the dimension Y in the squeegee direction of the figure formation area. And a dimension X perpendicular to the squeegee direction, a dimension Y in the squeegee direction of the substantially rhombic mesh hole 14 arranged in the center of the figure forming area, a dimension X perpendicular to the squeegee direction, and the mesh line portions 17 and 18 Using the arrangement angle α and the width W, the following expressions (1) and (2) can be used.
PX = AX + W / cos α (1)
PY = AY + W / sin α (2)

In addition, the relationship of the following equation (3) exists between the dimension AY in the squeegee direction of the substantially rhombic mesh hole 14 arranged at the center of the figure forming region, the dimension AX in the direction perpendicular to the squeegee direction, and the angle α. is there.
AY = AXtanα (3)

  The screen printing plate 10 can be designed using the above formulas (1) to (3). Next, an example of the design procedure will be described.

  First, a substantially rhombic mesh hole 14 is arranged from the center of a substantially rectangular figure forming region with dimensions X and Y. At this time, the dimensions AY, AY, pitches PX, PY of the substantially rhombic mesh holes 14 arranged at the center of the figure forming region, the arrangement angle α and the width W of the mesh line portions 17, 18 are set to predetermined initial values. To do.

  When X / PX and Y / PY are both odd numbers, or when X / PX and Y / PY are both even numbers, for example, as shown in FIG. The mesh holes 14 are arranged so that the center of the substantially rectangular figure forming region coincides with the center of the mesh hole 14.

  When X / PX is an odd number and Y / PY is an even number, or when X / PX is an even number and Y / PY is an odd number, a mesh line as shown in FIG. The intersection of the parts 17 and 18 is arranged.

  Next, approximately rhombic mesh holes 14 are arranged at mesh pitches PX and PY in parallel with the sides of the figure forming area from the center of the substantially rectangular figure forming area. When X / PX and Y / PY are integers, the area of the mesh hole 16 obtained by dividing the substantially rhombus arranged along the side of the graphic forming area except the corner of the graphic forming area is the rhombus arranged in the center. It becomes half (50%) of the area of the mesh hole 14.

  When X / PX and Y / PY are not divisible by an integer, the angle α is appropriately set within a range of 30 to 55 degrees, and is arranged along the side of the figure forming area except for the corner of the figure forming area. The area of the mesh hole 16 into which the rhombus is divided is set to be half (50%) of the area of the rhombus mesh hole 14 disposed in the center. That is, if the angle α is changed as a parameter, PX and PY can be changed from the equations (1) to (3), so that X / PX and Y / PY can be divided by integers.

  Next, if necessary, the mesh pitches PY and PX are changed so that X / PX and Y / PY are not divisible by integers, except for the corners of the graphic forming area, and arranged along the sides of the graphic forming area. The area of the mesh hole 16 into which the approximately rhombus is divided is adjusted to be in the range of 30 to 60% of the area of the rhombus mesh hole 14 disposed in the center. For example, when the paste viscosity is low, small mesh holes 16 having an area ratio of about 30% are arranged along the sides of the graphic forming area so as not to cause printing. On the other hand, when the paste viscosity is high, the figure forming area is excluded except for the mesh holes 16 having a large area ratio of about 60% and the corners of the figure forming area as shown in FIG. Place along the sides of

  At this time, for example, by changing the arrangement angle α of the mesh line portions 17 and 18 while maintaining the width W of the mesh line portions 17 and 18, the mesh pitches PY and PX are calculated using the equations (1) to (3). change.

  As described above, the screen printing plate 10 is based on a biased mesh-like mesh arrangement, and the bias-like mesh arrangement angle is arranged so that the mesh holes 16 having a controlled area are arranged around the edges of the figure forming region. α is arbitrarily set within a range of 35 to 55 degrees. By selecting the mesh arrangement angle α with respect to the printed figure size, it is possible to arrange the mesh hole 16 having a certain area of about 30 to 60% with respect to the mesh hole 14 in the center part at the edge peripheral part. It becomes. The mesh arrangement method by selecting the mesh arrangement angle α also has versatility that can be adapted to each printed figure size, and can be applied to all figure dimensions and to each paste type.

  According to this method, in the production of an original for producing a screen printing plate, which is indispensable for forming the mesh holes 14, 15, 16 of the screen printing plate 10, the data production for producing the original plate is simple and complicated. There is no need for a program and there is almost no burden of productivity in terms of software and hardware in the production of the original plate.

  Instead of the rhomboid-based mesh hole as described above, a circular mesh hole is arranged at the center of the figure forming area, and a small circle formed by an arc and a string near the side excluding the corner of the figure forming area. It is also possible to place a mesh hole of area, but in this case, the ratio of the mesh hole area arranged near each side excluding the corner of the graphic area to the area of the central circular mesh hole It is not easy to adjust the range of 30 to 60% as in the case of mesh holes based on rhombuses.

  In the conventional screen printing plate, the mesh hole shape of the mesh portion is selected according to the print pattern shape, and mesh holes of the same area corresponding to the shape are arranged. On the other hand, in the screen printing plate of the present invention, mesh holes having different areas are designed and arranged at the edge peripheral part and the graphic central part for one printed graphic. The size and ratio of the mesh hole area can be changed by the arrangement angle α of the mesh. As a result, it is easy to create data that is indispensable when the original of the screen printing plate 10 is produced, and it is excellent in versatility, such as being able to cope with each figure size.

  In the conventional screen printing plate, a printing plate with a screen ridge having a fixed mesh angle of 30 degrees, 45 degrees, etc. is manufactured, but with respect to the edge peripheral portion of the graphic to be printed depending on the arrangement position of the graphic to be printed. The area of the mesh hole to be arranged varies. On the other hand, in the screen printing plate of the present invention, the mesh holes are controlled and arranged so that the area of the mesh holes with respect to the peripheral portions of all printed figures is a constant area ratio.

  As described above, the screen printing plate 10 can select (1) control of the printing blur amount by appropriately selecting, for example, the mesh hole arrangement angle α according to the size of the substantially rectangular printed figure. It has become possible to solve various problems such as improved linearity of print coating film, (3) prevention of clogging, (4) simplification of data processing amount required for original plate preparation, and (4) simplification of mesh design. .

  In other words, a mesh hole with a hole area capable of suppressing the amount of paste that passes through is arranged around the edge of the printed figure, and a mesh with a different hole area that allows sufficient paste supply at the center. Since the holes are arranged, appropriate paste suppression and paste supply control can be performed for each print area for one printed figure. As a result, it is possible to obtain printed graphics with excellent linearity with little printing blurring, and to produce and supply screen printing plates that do not cause paste clogging and printing blurring and have two printing characteristics that have not been compatible with each other in the past. It becomes possible. In addition, since the mesh arrangement is a bias network arrangement that selects the arrangement angle, mesh design and original data preparation are simple, excellent original plate productivity, and applicable to any paste type and figure size. It is also excellent in versatility.

  Furthermore, by optimizing the mesh arrangement angle α in accordance with the printing characteristics of the paste, the area of the mesh hole arranged at the edge portion can be set to an arbitrary area with respect to the diamond mesh hole arranged at the center of the figure forming area. The ratio can be set to about 30 to 60%, and a screen printing plate can be provided which can control printing blur on any paste.

  The present invention is not limited to the above-described embodiment, and can be implemented with various modifications. For example, in the design of the screen printing plate 10, the dimension AX or AY of the substantially rhombic mesh hole 14 and the width W of the mesh line portions 17 and 18 may be changed in addition to the mesh arrangement angle α.

It is the (a) principal part perspective view of a screen printing plate, (b) The principal part top view. (Conventional example) It is (a) principal part top view of a screen printing plate, (b) principal part sectional drawing. (Example) It is explanatory drawing of the manufacturing process of a screen printing plate. (Example) It is a principal part perspective view which shows the use condition of a screen printing plate. (Example) It is a principal part top view of a screen printing plate. (Modification 1) It is a principal part top view of a screen printing plate. (Modification 2)

Explanation of symbols

10, 10a, 10b Screen printing plate 11 Main body 11a, 11b Main surface 12 Recess 14 Mesh hole (first through hole)
15,16 mesh hole (second through hole)
17, 18 Mesh line part

Claims (2)

A plurality of through-holes penetrating between the principal surfaces are formed in a substantially rectangular figure forming region when viewed from a direction perpendicular to the principal surface. On the one main surface facing the printed material, in the screen printing plate in which the graphic forming region and the recesses are formed in the periphery thereof,
The through hole is
When seen through from the vertical direction of the main surface, the direction in which all sides extend obliquely with respect to each side of the figure forming region and the opposite vertices are substantially parallel to the side of the figure forming region or A first through-hole having a substantially rhombic cross-sectional shape that is substantially perpendicular, the entirety of which is disposed in the figure forming region;
When viewed through the main surface from a vertical direction, all sides extend obliquely with respect to each side of the graphic forming region and a direction connecting the opposing vertices is substantially parallel to the side of the graphic forming region or Of the two parts divided by the one or two sides of the graphic forming area, the substantially rhombus that is substantially perpendicular has the cross-sectional shape of the part in the graphic forming area, and each of the graphic forming areas A second through hole disposed in the vicinity of the side,
The first through hole and the second through hole are generally arranged at equal intervals so that the respective sides are aligned on a straight line,
When seen through from the vertical direction of the main surface, the figure forming area has a substantially constant width that extends obliquely at substantially equal intervals and intersects the sides of the figure forming area between the through holes. A screen printing plate, wherein a mesh line portion is formed. When viewed through the main surface from a vertical direction, an angle formed by a right angle direction of the squeegee direction and the mesh line portion is not less than 30 degrees and not more than 55 degrees,
The area of the second through hole is 30% or more and 60% or less of the area of the first through hole when viewed through the main surface from a vertical direction. Screen printing version.

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