JPH0512949A - Manufacture of plane type switch - Google Patents

Abstract

PURPOSE:To standardize the spacer of a plane type switch and facilitate mass- producing them. CONSTITUTION:In a uniform thicknesss, adhesive coating films 11, 15 are first applied to an insulative film 14 while striped or grated gaps 12, 16 having a certain width are left prior to provision of through hole 13 for the response to an upper and a lower electrode in the insulative film 14. Then a through hole 13 is formed in this insulative film 14 so that it includes the gaps 12, 16 where no adhesive is applied, and finally the upper and lower electrodes and spacer are affixed together. This facilitates standardization and mass-production of spacers for plane type switch 4, and this application of adhesive to the insulative film 14 in the condition free of through hole 13 generates uniform thickness of the films 11, 15, and a plane type switch can be achieved which is free of distortion and warp.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a keyboard switch, and more particularly to a method of manufacturing a spacer for a flat keyboard switch.

[0002]

2. Description of the Related Art FIG. 1 shows a conventional example of a flat-type switch. In the figure, 1 and 4 have upper and lower electrodes 2 and 5 which are contact points of the switch on opposite surfaces, and an elastic insulating spacer. A pair of flexible insulating sheets held on the fixing plate 6 via 3, 7 is a ventilation hole formed in the fixing plate 6, and 8 is a space in the spacer for responding to the upper and lower electrodes. The vent holes 7 are connected to the respective gaps for electrode response and are led out to the outside. Without this vent 7, spacer 3
When the insulation sheets 1 and 4 are attached to the, if the air in the void 8 is released, the always-on switch may be turned on or the operating force may become extremely light. Once moisture is trapped inside the switch, it is difficult for it to escape to the outside, which causes deterioration of insulation.

[0003]

In the above-mentioned conventional planar switch, it is necessary to individually form the ventilation holes 7 in the insulating sheet 4 and the fixing plate 6 so as to correspond to the respective electrodes. There was a drawback that it was troublesome.

[0004]

In order to solve the above-mentioned problems, the present invention provides an adhesive agent in which at least one of the opposing surfaces of an insulating insulating sheet has stripes or grids with gaps of a predetermined width. To a uniform film thickness, a step of punching the adhesive film and the insulating sheet to form a through hole at an arbitrary position of the insulating sheet including the gap portion, and the through hole And a step of adhering the insulating sheet to a flexible insulating sheet having upper and lower electrodes so as to form a gap for responding to the lower electrode.

[0005]

[Function] First, the adhesive is applied to the insulating sheet in a striped or grid pattern with a gap having a predetermined width so as to have a uniform film thickness, and then the insulation sheet including the gap portion is penetrated in an arbitrary shape at any position. Since holes are formed to form the upper and lower electrode response spaces, the adhesive thickness becomes uniform and a flat switch without distortion or warpage can be provided, and standardization and mass production of spacers are facilitated.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Explaining in detail with reference to FIGS.
FIG. 2 is a top view of the spacer, and 14 is an elastic insulating sheet that serves as a base material of the spacer. The insulating sheet 14 has a striped gap 12 on both the front and back surfaces of the insulating sheet 11 to form a striped adhesive coating 11 , 15 is formed. For example, an adhesive made of acrylic resin or the like is applied substantially uniformly by roller printing or the like. Therefore, a groove corresponding to the thickness of the coating film 11 is formed at the gap 12. Reference numeral 13 is a through hole formed at a position where the switch is provided. The through hole 13 is formed so as to intersect with any of the gaps 12 and penetrate the coatings 11 and 15 and the insulating sheet 14 on the front and back sides. To be done.

Incidentally, the pattern of the gap 12 may be formed in a striped shape as described above, or may be formed in a shape intersecting in a grid pattern as required. Further, as described above, the gap 12 is the coating film 1
Although formed on both sides of 1,15, it may be formed on only one of them if necessary. 3 shows the cross section of FIG. 2A-A, and FIG. 4 shows the structure near the hole 13.

A flexible insulating sheet having upper and lower electrodes as shown in FIG. 1 is adhered on the adhesive coatings 11 and 15, and these are carried on a fixing plate to form a flat switch. Finally formed. In this case, the hole 13 serves as a space for responding to the upper and lower electrodes of the switch, and the end of the trough-shaped space 12 is led out of the switch to serve as a ventilation hole.

[0009]

[Effects] According to the present invention described above, it is not necessary to individually provide a ventilation hole for each switch in a fixing plate or the like as in the conventional case, and it is formed all at once at the stage of forming a coating film of an adhesive. In addition, if this is formed in a striped or grid pattern as described above, it becomes possible to selectively form the key of the switch at any position, making it easy to standardize and mass-produce the spacer. However, it has many practical advantages as a manufacturing method, such as being extremely convenient in terms of management.

Further, at this time, if the adhesive is applied to the insulating sheet by screen printing or the like, only one type of printing mask is required, which is convenient in terms of production control and reduces the cost. At the same time, as another advantage of this manufacturing method, since the adhesive is applied to the insulating sheet without through holes by screen printing or the like, a uniform film thickness can be obtained for the applied adhesive, and the film thickness of the adhesive is The unevenness and warpage of the flat switch due to the unevenness are eliminated.

Further, the adhesive coating film is originally necessary for fixing the insulating sheet having the electrodes to the spacers 14, and this does not particularly increase the number of steps.

[Brief description of drawings]

FIG. 1 is a side sectional view according to a conventional example.

FIG. 2 is a top view of the spacer of the present invention.

FIG. 3 is a side sectional view of the spacer of the present invention.

FIG. 4 is a perspective view of an essential part of the present invention.

[Explanation of symbols]

 2,5 Electrode 11,15 Adhesive coating 12,16 Gap 13 Through hole 14 Insulation sheet to be spacer

Claims (1)

Claim: What is claimed is: 1. A step of applying an adhesive to a uniform film thickness on at least one surface of an elastic insulating sheet facing each other in a striped pattern or in a grid pattern, leaving gaps of a predetermined width. And a step of punching the adhesive film and the insulating sheet at arbitrary positions of the insulating sheet including the gap portion to form through holes having an arbitrary shape, and the through holes become voids for upper / lower electrode response. And a step of adhering the insulating sheet to a flexible insulating sheet having upper and lower electrodes, which are sequentially performed.