JP2000168255A - Screen plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the occurrence of deformation in printing patterns, and optimize the configurations, dimensions, and arrangements of openings through which a printing paste passes. SOLUTION: This includes at least a film-like member 4 provided with penetration holes 2 with dimensions, configurations and arrangements designed in conformity with patterns in an area in accordance with patterns to be printed, and openings 3 adjoining the penetration holes 2 and forming a printing paste supplied via the penetration holes 2 into patterns between it and matter to be printed. The member 4 is made of metal, and the openings 3 are formed by the use of a metal film or photosensitive resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen plate (metal mask) for forming a structure of a large-sized image display device with high precision by a screen printing method.

[0002]

2. Description of the Related Art A screen plate used for forming a pattern on a large area by a screen printing method has been conventionally produced as follows. That is, first, wire diameter 10-3
A film that blocks the passage of the printing paste is formed by applying a photosensitive resin or adhering a photosensitive resin film to a stainless steel fiber of about 0 μm or a stainless steel fiber that has been specially processed to a mesh of 250 mesh or more. . Then, a desired pattern is baked on the film by photolithography, and an unnecessary portion is etched to form an opening through which the paste can pass in a desired pattern. As a result, a screen plate is formed.

[0003] Some screen plates for higher precision and higher definition are formed by electroforming or the like as a metal film of stainless steel or nickel instead of the above-mentioned photosensitive resin.

On the other hand, photolithography, etching,
By using electroforming, laser, or other methods alone or in combination, a metal mask with a large aperture ratio can be manufactured by hollowing out the metal film or resin film itself into a desired pattern without using a knitted mesh. Is being done. Further, by using this technique to produce a non-knitted mesh, a thin mesh such as an alpha mesh (product name) or a high mesh (product name) with a high aperture ratio has also been produced. This has openings all over the surface as in the case of the conventional knitted mesh, and is used as a screen plate through a conventional screen plate making process.

[0005]

However, in the screen plate using the above-mentioned knitted mesh, since the variation of the mesh is limited, the shape, size and arrangement of the openings of the mesh through which the paste passes during printing, and Since the thickness and the like are determined, it is difficult to optimize these values, which are important parameters for printing.

Further, metal fibers are hard, and are hard to bend because they are not as hard as those of special fibers used for high-definition and high-precision applications. Therefore, when a mesh is knitted, one yarn is deformed more than the other at the intersection of the mesh. And it is inevitable that the thickness will vary. Therefore, the tensile strength of the finished mesh is different between the warp and the weft, making it difficult to produce a plate having a uniform tension. In addition, the knitted mesh has a structure in which two yarns are three-dimensionally crossed, so that a knitted mesh 2
Since the yarns of the book can slide on each other or make such movements with the mesh as a fulcrum, they cause pattern deformation during printing.

On the other hand, in a metal mask that does not use a knitted mesh, since the opening shape is a printed pattern, for example, L / S = 100 μm / 2 at a length of 30 cm.
When a pattern in which 1,000 thin line patterns of 00 μm are arranged is formed, there is a problem that the thin line pattern portion is largely deformed by the tension when the plate is manufactured.

In addition, since non-knitted meshes such as alpha meshes produced by using a metal mask technique are basically considered to be used as general-purpose meshes, limited variations in the shape of openings, like the knitted meshes,
There are only dimensions and arrangements and line dimensions and gauze thicknesses, and it is difficult to optimize these values.

SUMMARY OF THE INVENTION In view of the above-mentioned problems of the prior art, it is an object of the present invention to prevent deformation of a print pattern and to optimize the shape, size and arrangement of openings through which a print paste passes. It is to provide a screen version that can do.

[0010]

In order to achieve this object, a screen plate of the present invention is provided with a through-hole at least in a region corresponding to a pattern to be printed in a size, shape and arrangement designed in accordance with the pattern. A film-shaped member provided, and an opening which is adjacent to the through-hole and forms the pattern with the printing paste supplied through the through-hole and the printing material.

According to this, since the through-hole through which the printing paste passes is provided in the film-like member and is provided in a size, shape and arrangement designed in accordance with the printing pattern, the deformation of the printing pattern is prevented, Further, the shape, dimensions and arrangement of the through holes can be easily optimized.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a preferred embodiment of the present invention, a screen plate is provided as a mesh, at least in an area corresponding to a pattern to be printed, with a large number of through holes having dimensions, shapes and arrangements designed in accordance with the pattern. It has a metal film having holes and an opening formed using a metal film or a photosensitive resin for forming a printing paste in accordance with the pattern. The density, size, shape, and arrangement of the through holes of the metal film used as the mesh differ depending on the location. The through-hole of the metal film used as the mesh exists at a position at which the paste can be supplied to at least the opening.
The through holes are provided only in the area corresponding to the pattern. The opening is formed as an inside of a convex portion having a predetermined width.

[0013]

[Embodiment 1] FIG. 1 is a schematic view showing a screen plate according to a first embodiment of the present invention, and clearly shows the features of the present invention. FIG. 1A is a view as seen from the side of the contact surface with the substrate to be printed, FIG. 2B is a view as seen from the squeegee sliding surface side, and FIG. 1C is a sectional view. In the figure, the configuration and the structure are simplified so as to be understood.

In FIG. 1, reference numeral 1 denotes a metal film forming an opening for forming a printing paste into a printing pattern, 2 denotes a through hole for supplying the paste to the opening, and 3 denotes a hole formed as the opening. Striped groove, 4 is through hole 2
Are provided, and a metal film 5 functioning as a mesh is a metal film in which the metal films 1 and 4 are integrated.

That is, as shown in FIG. 1 (c), this screen plate (mask) has a mesh portion 4 having a through hole 2 which is a passage hole of a paste corresponding to a mesh in a conventional screen plate, and a printing pattern. Is formed into two portions of an opening forming portion 1 having a stripe groove 3 which is an opening for forming the opening. The mesh part 4 is a metal film 4
The metal film 4 has a large number of through holes 2 extending from the front to the back. The through-hole 2 is a hole through which the paste passes, and its planar shape, cross-sectional shape, size, and arrangement can be arbitrarily set.

The material of the metal film 4 is generally stainless steel, nickel, nickel-cobalt alloy or the like.
It is not necessarily limited to this. As a method for forming the through-hole 2, there are generally methods using photolithography, etching, electroforming, laser, and the like, but are not particularly limited thereto. The metal film 1 having the openings, that is, the stripe grooves 3 should be formed using the same material and method as the above-described metal film 4 if high precision is required. As in the case of screen plate making, it is also possible to manufacture using a photosensitive resin or the like. The screen plate formed by such a material and method is formed as a metal film 5 in which the metal film 1 and the metal film 4 are continuous, and the thickness thereof can be arbitrarily set to about 10 to 200 μm. It is set appropriately according to.

When viewed from the substrate contact surface side, as shown in FIG. 1A, a stripe pattern as a desired print pattern has L / S = 100 μm / 400 μm and a depth of 20 μm.
When viewed from the side of the squeegee sliding surface, as shown in FIG.
The portions having the circular through-holes 2 of 0 μmΦ are arranged at a 90 μm pitch along the longitudinal direction only at the positions where the line patterns (stripe grooves 3) exist. As shown in FIG. 1 (a), the opposite side of the through-hole 2, that is, the substrate contact surface side, communicates with the bottom of the stripe groove 3, so that the paste applied on the squeegee sliding surface becomes high with printing. It easily passes through the circular through-hole 2 of the opening, easily fills the space surrounded by the substrate to be printed and the stripe groove 3 so that a desired fine line stripe pattern can be obtained.

As shown in FIG. 1, where the direction of the stripe pattern (stripe groove 3) is changed at a certain angle, in the screen plate using the conventional mesh, the intersection of the mesh and the opening forming the pattern are formed. According to this embodiment, the through-holes 2 are formed in the print pattern (stripe groove 3).
The size, shape and arrangement designed in accordance with the printing pattern are provided in a region conforming to the above, so that a portion where such a discharge failure occurs can be eliminated. Further, unlike the conventional metal mask, the through-hole 2 which is the paste passage opening is not in the shape of the print pattern. Therefore, even when the print pattern has a stripe shape, the structure, that is, the through-hole 2 is formed in the stripe (stripe groove 3). Is present, the stripe groove 3 for forming a print pattern can be formed, and the deformation of the stripe groove 3 is also prevented.

[Embodiment 2] FIG. 2 is a schematic view showing a screen plate according to a second embodiment of the present invention. FIG. 1A is a diagram viewed from the side of the surface in close contact with the substrate which is a printing substrate,
FIG. 1B is a perspective view. In the figure, the configuration and the structure are simplified so as to be understood. 6, reference numeral 6 denotes a metal film functioning as a mesh, 7 denotes a circular photosensitive resin film formed on the metal film 6 as an opening of a desired print pattern, and 8 denotes a metal film formed on the metal film 6. It is a square through hole.

This screen stencil is for forming a printed pattern in which circular patterns of 400 μmΦ are arranged in lattice points at a pitch of 1 mm in length and width. As shown in FIG. 2, a portion surrounded by the photosensitive resin film 7 formed as an opening pattern of 400 μm
A regular hexagonal through-hole 8 of 15 μm for passing the paste, which is inscribed in the circle, is arranged in a honeycomb shape at a center interval of 100 μm. The photosensitive resin film 7 has an inner diameter of 400 μm, an outer diameter of 600 μm, a height of 15 μm, is formed by photolithography and etching, and has a width of 200 μm.
An opening 10 is formed as an inner side of the convex portion 9 of FIG.

When printing is performed using the screen plate of this embodiment, the discharge of the paste is suppressed due to the low aperture ratio, and the dripping can be reduced. Also,
Since the pressure at the time of printing concentrates on the portion of the hollow circle formed by the photosensitive resin film 7, the adhesion to the substrate to be printed can be improved. In addition, the screen plate can be used as a substrate for printing.
Since the contact is made only with the belt-shaped convex portion 9 having a width of 0 μm, printing with good plate separation can be performed. As a result, a desired circular pattern of 400 μmΦ can be printed almost as designed.

[0022]

As described above, according to the present invention, since a film-like member having a through hole provided in a size, shape, and arrangement designed in accordance with a printing pattern is provided, an excessive projection of a printing paste is prevented. It is possible to control the edge of the print pattern and the undulation of the surface generated when a conventional mesh is used, thereby obtaining a uniform and high-definition print pattern. Further, in the case of a screen plate using a conventional knitted mesh, there are openings of the mesh other than the openings for forming the print patterns, whereas according to the present invention, the area corresponding to the print patterns Since only the through-hole is provided, the portion contributing to the structure of the screen plate is increased, the strength of the screen plate is increased, and printing can be performed with high accuracy.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a configuration of a screen plate according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram showing a configuration of a screen plate according to a second embodiment of the present invention.

[Explanation of symbols]

1: metal film, 2: circular through hole, 3: stripe groove,
4: metal film, 5: metal film, 6: metal film, 7: hollow circular photosensitive resin film, 8: hexagonal through hole, 9: convex portion, 1
0: Opening.

Claims (6)

[Claims] 1. A film-shaped member provided with a through-hole at least in a region corresponding to a pattern to be printed and having dimensions, shapes, and arrangements designed in accordance with the pattern; An opening for forming the pattern in the pattern between the printing paste supplied through the hole and the printing substrate. 2. The screen plate according to claim 1, wherein the film-shaped member is a metal film, and the opening is formed using a metal film or a photosensitive resin. . 3. The method according to claim 1, wherein the density, size, shape or arrangement of the through-holes differs depending on the location.
Screen version described in. 4. The screen plate according to claim 1, wherein the through hole exists at a position where a printing paste can be appropriately supplied to the opening. 5. The screen plate according to claim 1, wherein the through-hole is provided only in a region corresponding to the pattern. 6. The device according to claim 1, wherein the opening is formed as an inside of a convex portion having a predetermined width.
6. The screen version according to any one of items 1 to 5.