JPH09275268A - Method for forming printed wiring sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a double-sided conduction switch of high mechanical strength by a method wherein a mesh sheet woven from chemical fiber, metal fiber, or natural fiber is turned conductive by electroless plating, etching resist is applied, plating is removed from the mesh sheet except a pattern, and etching resist is separated off for the formation of a conductive pattern. SOLUTION: A mesh sheet 1 woven from chemical fiber such as polyester, nylon or the like, soluble fiber made from protein, or natural fiber such as silk or cotton is electrolessly plated with metal 2 to turn conductive. The mesh sheet 1 is electroplated with copper 3. Etching resist 4 is applied onto the flat plated surface of the mesh sheet 1, a pattern is provided onto the etching resist 3, the etching resist 4 is exposed to light and developed, etching is carried out to melt metal plating on a part except the pattern, and the etching resist 4 is separated off, whereby a printed wiring sheet 6 provided with a copper pattern 5 can be obtained. The mesh sheet can be formed into a double-sided conduction switch because electrically conductive member is restrained from getting in the mesh sheet.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a printed wiring sheet based on a mesh sheet or a porous sheet in which various fibers are knitted.

[0002]

2. Description of the Related Art In a conventional printed wiring board, a thin copper plate is adhered to the surface of a resin substrate, a photosensitive emulsion is coated on the surface, and exposure / development etching is performed to form a pattern. And
In order to make the front and back patterns conductive, a hole was made in the pattern portion with a drill and plating was applied to the inner surface for conduction.

[0003]

In the above-mentioned prior art, the thin copper plate adhered to the resin substrate is easily peeled off, and if the adhesive is made strong to prevent it, the conductivity is deteriorated, and a hole is drilled for plating. There is a problem in that the work of conducting electricity is extremely troublesome and takes time.

[0004]

SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned problems, and electroless plating is applied to a mesh sheet and a porous sheet woven of chemical fibers, metal fibers, natural fibers, etc. to conduct electricity. It is characterized in that the entire surface is plated with electrometal, an etching resist is formed on a flat plated surface, plating other than the pattern portion is removed, and then the etching resist is peeled off to form a conductive pattern. .

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in detail with reference to the illustrated embodiments. 1 is a synthetic fiber such as polyester and nylon, a soluble fiber made from protein,
It is a mesh sheet formed by knitting natural fibers such as silk and cotton into a sheet shape, or a porous sheet in which a thin plate is perforated by a punching drill, laser or the like. The entire mesh sheet and porous sheet 1 are plated with metal 2 by electroless plating as shown in FIG. Then, electrical continuity is established by an apparatus as shown in FIG. 6, and electrolytic copper plating 3 is applied to the entire surface as shown in FIG. Etching resist 4 is applied to this flat plated surface, the pattern is exposed and developed, and etching is performed as shown in FIG. 4 to dissolve the metal plating other than the pattern portion, and then the etching resist 4 is peeled off as shown in FIG. Then, the printed wiring sheet 6 having the copper pattern 5 is formed.

[0006]

According to the present invention, chemical fibers, metal fibers,
Electroless plating is applied to a mesh sheet and porous sheet woven of natural fibers, etc. to establish continuity, electrometal plating is performed on the entire surface, and an etching resist is formed on a flat plated surface.
Since the plating except the pattern portion is removed and then the etching resist is peeled off to form a conductive pattern, the printed wiring sheet formed by the method of the present invention is electrically conductive to the mesh sheet or the porous sheet. A strong double-sided conduction switch is obtained in which the members do not easily enter and separate, and when several sheets are polymerized, there is no need for the complicated procedure of perforating and plating as in the past, and the printed wiring sheet itself is breathable, so It is extremely simple if the metal paste 10 is embedded by aligning the positions. Further, since the printed wiring sheet of the present invention is flexible, it is not necessary to form a printed wiring board according to the shape of the installation place as in the prior art, and the wiring can be rolled according to the shape of the wiring place. There is very little space and wiring is easy.

Further, if a mesh body made of fibers such as protein fibers that can be dissolved in an acid / alkali solution is used, the fibers in the portion that requires light transmission can be melted, so that the pattern can be obtained by simply sticking it on a glass plate. Glass substrate can be formed,
When used in a fax machine or the like, it has an effect that a light-transmissive substrate can be easily manufactured. Further, since the parts other than the pattern have air permeability, the heat dissipation is good and the parts attached to the printed wiring sheet can be cooled to prevent damage. Further, since it is a mesh sheet or a porous sheet, liquid can pass through it, so that both sides can be plated with an electric contact from one side as shown in FIG. or,
Since there is no hole punching process, multi-layer conduction can be achieved by embedding a metal paste, and the conduction paste enables multi-layer conduction.
It is possible to produce a large size printed wiring sheet of 000 x 2000 mm.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a mesh sheet.

2 is a cross-sectional view of the mesh sheet of FIG. 1 with electroless plating.

FIG. 3 is a cross-sectional view of the plated sheet of FIG. 2 plated with an electric metal.

FIG. 4 is a cross-sectional view in which an etching resist is applied to FIG. 3 and a pattern is exposed and developed.

5 is a cross-sectional view of the printed wiring sheet from which the etching resist of FIG. 4 has been peeled off.

FIG. 6 is a cutaway front view of an essential part of the apparatus for applying the electrometal plating of FIG.

[Explanation of symbols]

 1 mesh sheet or porous sheet 2 electroless plating layer 3 electrolytic copper plating layer 4 etching resist 5 copper pattern 6 printed wiring sheet

Claims (1)

[Claims] 1. A mesh sheet and a porous sheet woven of chemical fibers, metal fibers, natural fibers, etc. are electrolessly plated to establish continuity, electroplating is performed on the entire surface, and an etching resist is applied to a flat plated surface. A method for forming a printed wiring sheet, which comprises forming and removing plating other than the pattern portion, and then removing the etching resist to form a conductive pattern.