JPH0852951A - Mesh good in opening ratio, production thereof and screen plate utilizing mesh - Google Patents

Abstract

PURPOSE:To enhance strength and to make deformation hard to generate while enhancing an opening ratio. CONSTITUTION:A metal mesh is constituted of a large number of apertures 1 showing a honeycomb structure. The figure data of a large number of the apertures 1 is inputted to a computer and the figure of a large number of the apertures 1 is baked on a film on the basis of the inputted figure data to form a film mask having the patterns of a large number of the apertures. The patterns of a large number of the apertures are baked on the photoresist applied to a metal plate by using the film mask to be developed. Etching is applied through the photoresist to form a large number of the apertures to the metal plate to produce the mesh. Aperture parts and non-aperture parts are formed to the mesh to form a screen plate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen printing plate for solder paste printing, a mesh for screen printing for thick film printing, and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, the problems to be solved by the invention
For such a screen plate, a stainless mesh, a tetron or a nylon mesh, etc. are used, and a screen image is formed by forming a resist image on these meshes. However, since the open area ratio (the ratio of the area of the holes to a certain area) of these meshes is low and is about 50% at the maximum, when a screen plate having a resist image on such a mesh is used, it is high. Printing cannot be performed using a paste (ink) having a high viscosity and a large particle size.

Therefore, a screen mask (metal mask) is used in which a metal plate is used and only a printed portion is penetrated by an etching method or an electroforming method, and the printed portion has no mesh. However, when such a metal mask is used, there is a problem in that the plate making requires a long time and the plate making cost is high because an etching or electroforming process must be performed each time the plate is made.

The screen plate using the above mesh is advantageous in terms of plate making cost, simplicity and speed, but as described above, there is a problem that the aperture ratio of the mesh is low, and this aperture ratio is low. The reason for this is that if the porosity is increased,
This means that the tensile strength becomes weak and elongation easily occurs, so that the aperture ratio cannot be increased so much.

In view of the above problems of the prior art, it is an object of the present invention to provide a mesh having a large porosity and no deformation due to elongation, a method for producing the mesh, and a screen plate using the mesh. .

[0006]

In order to achieve this object, the mesh of the present invention is characterized by having a large number of holes having a honeycomb structure formed in a metal plate. The shape of the hole is hexagonal or circular, and the hole can be formed by etching.

Further, in the method for manufacturing a mesh of the present invention, a step of inputting graphic information of a large number of holes having a honeycomb structure into a computer, and the graphic of the large number of holes is masked based on the inputted graphic information. A step of forming a mask having a pattern of the large number of holes by baking on it, a step of baking and developing on a photoresist applied to a metal plate using this mask, and an etching through this photoresist Thereby forming the plurality of holes in the metal plate. In the step of creating the mask, based on the input graphic information, the graphic of the large number of holes is formed on the unexposed mask using a photoplotter, thereby forming the graphic of the large number of holes. Can be printed on the mask.

Further, the screen plate of the present invention is characterized in that the mesh thus produced is provided with openings and non-openings made of photoresist. The openings and non-openings formed by the photoresist can be formed in the same manner as in the plate making method using a normal mesh.

[0009]

According to the mesh of the present invention, since a large number of holes have a honeycomb structure, displacement and deformation are unlikely to occur in any direction, and the strength is improved. Therefore, the porosity is increased correspondingly without causing a problem. Therefore, the applicable range of the mesh is greatly expanded.

According to the method for producing a mesh of the present invention, a mesh having the same advantages can be produced very easily. That is, CAD or the like using a computer is used to create the pattern of the film mask, and a pattern composed of holes of arbitrary sizes and shapes is easily designed.

Further, the screen plate of the present invention using such a mesh has a large opening ratio of the mesh in the opening of the photoresist, for example, 95%. ) Can be used without any problem in printing using. Further, by preparing the mesh in advance, it is not necessary to carry out etching or electroforming, and plate making can be carried out quickly and at low cost only by simple steps such as photoresist coating, exposure and development.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partial plan view of a metal mesh according to an embodiment of the present invention. As shown in the figure, this metal mesh has a large number of hexagonal holes 1 having a honeycomb structure.

FIG. 2 is an enlarged view showing the dimensions of the metal portion of this metal mesh. As shown in the figure, the length of each side is 0.225 mm, the width is 0.025 mm, and the aperture ratio is 9
Achieved 5%. Moreover, using this mesh, the screen plate on which an image is formed by photoresist as openings and non-openings retains sufficient strength in applications such as solder paste printing, and is unlikely to be deformed or displaced. Has become.

This metal mesh is manufactured as follows. First, the length of one side shown in FIG. 2 is 0.225 m.
Data of a honeycomb-structured figure having a large number of holes surrounded by hexagonal metal parts with a width of 0.025 ± 0.005 mm and a honeycomb structure is input to a CAD system. Next, according to this figure data, a photo plotter is used to expose the figure on the unexposed mask to form the figure of a large number of holes 1 shown in FIG. 2 on the unexposed mask. In this way, by using the CAD system to arbitrarily create data on the shape of a honeycomb shape and other shapes having a honeycomb structure, a mask corresponding to the data can be easily created.

Next, a stainless steel plate having a thickness of 0.05 mm and vertical and horizontal dimensions of 350 mm and 430 mm is prepared, degreased, and coated with a photoresist. Next, the mask prepared as described above is placed on this photoresist, exposed, and developed. Next, etching is performed through the developed photoresist to form a large number of holes 1 in the stainless steel plate. Then, after the etching is completed, the resist is peeled off, and the appearance and dimensions are inspected to complete the production of the metal mesh. Although a stainless plate having a predetermined size is used here, of course, a metal plate made of another metal may be used, and the size thereof is arbitrary.

FIG. 3 is a partial plan view of a metal mesh according to another embodiment of the present invention. As shown in the figure, this metal mesh has a large number of circular holes 2 having a honeycomb structure. This is also formed by ordinary etching using the mask having the pattern of FIG. The metal mesh plate having the pattern of such circular holes 2 also has a high aperture ratio, is hard to be deformed, and has a large strength.

It should be noted that one metal mesh may be provided with a plurality of mesh portions having different open ratios depending on the application. Further, the shape of the holes may be hexagonal with rounded corners (close to a circle).

Such a metal mesh according to the present invention can be applied to, for example, a seal plate for disposing a sealant in a seal portion around a liquid crystal display panel as shown in FIG. In that case, the mesh portion 3 is formed only in the portion corresponding to the seal shape in the metal plate to be used, and the other portions are not etched and the metal plate portion 4 is formed.
Leave as. As a result, it is possible to prevent the sealant from being arranged in an unnecessary portion and prevent a pinhole from being formed on the screen. Further, it can be applied to a printing screen plate for forming a pattern of Au paste, phosphor paste, insulating paste, solder paste or the like on a printed circuit board, a ceramic substrate, a glass substrate or the like. In particular, it is suitable for a solder paste printing plate (metal mask) on a printed circuit board, a ceramic substrate, or the like.

[0019]

As described above, according to the mesh of the present invention, a large number of holes having a honeycomb structure formed in a metal plate are provided, so that the mesh is prevented from being displaced or deformed in any direction. It is possible to improve the strength and simultaneously increase the open area ratio.

Further, since the screen plate of the present invention uses a mesh having such a high porosity, it replaces the metal mask produced by the conventional etching or electroforming method and has a high viscosity. It can be applied to printing using a paste (ink) having a large diameter. Moreover, if a mesh is prepared in advance, it is possible to easily, quickly and at low cost simply form an image with a photoresist without the need for steps such as etching and electroforming. Therefore, it is possible to quickly respond to the customer's request.

[Brief description of drawings]

FIG. 1 is a partial plan view of a metal mesh plate according to an embodiment of the present invention.

FIG. 2 is an enlarged view showing dimensions of a metal portion of the metal mesh plate of FIG.

FIG. 3 is a partial plan view of a metal mesh plate according to another embodiment of the present invention.

FIG. 4 is a plan view showing a form in which the metal mesh plate of the present invention is applied to a seal plate for applying a sealant to a seal portion of a liquid crystal display device.

[Explanation of symbols]

1: Hexagonal hole, 2: Circular hole, 3: Mesh part,
4: Metal plate part.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shinichi Shimokomaki 3-1-1 Minamiei, Kagoshima City, Kagoshima Prefecture

Claims (6)

[Claims] 1. A mesh having a large number of holes having a honeycomb structure formed on a metal plate. 2. The mesh according to claim 1, wherein the shape of the holes is hexagonal. 3. The mesh according to claim 1, wherein the shape of the holes is circular. 4. A step of inputting graphic information of a large number of holes having a honeycomb structure into a computer, and the graphic of the large number of holes being printed on a mask based on the inputted graphic information, the large number of holes. A step of forming a mask having a pattern of, and a step of baking the pattern of the large number of holes on a photoresist applied to a metal plate using this mask and developing, and performing etching through the photoresist. And a step of forming the large number of holes in the metal plate according to the above method. 5. In the step of creating the mask,
It is characterized in that the figure of the large number of holes is printed on the unexposed mask by using a photoplotter based on the inputted figure information, and the figure of the large number of holes is printed on the mask. The method for manufacturing the mesh according to claim 4. 6. A screen plate comprising the mesh according to claim 1 provided with an opening and a non-opening made of a photoresist.