JPS6220113Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved structure of a spacer for a keyboard switch, particularly a planar keyboard switch. Figure 1 shows a vertical example of a flat switch.
In the figure, numerals 1 and 4 have upper and lower electrodes 2 and 5, which serve as contact points of the switch, on their opposing surfaces, and a pair of flexible electrodes held on a fixed plate 6 via an elastic insulating spacer 3. 7 is an insulating sheet having a fixed plate 6.
A ventilation hole 8 is formed in the upper and lower electrode response spacers, and the ventilation hole 7 is connected to each of the electrode response spaces and led out. Without this ventilation hole 7, when the insulating sheets 1 and 4 are attached to the spacer 3, if the air in the gap 8 is removed, the switch will remain on all the time, and the operating force will be extremely low. Additionally, once moisture gets trapped inside the switch during a moisture resistance test, it is difficult to escape, which can cause insulation deterioration.

Furthermore, in the conventional switch described above, the insulating sheet 4
It is necessary to individually form ventilation holes 7 in the fixed plate 6 and the fixing plate 6 in correspondence with each electrode, which has the disadvantage that this work is extremely troublesome.

This invention is intended to eliminate the above drawbacks.
This will be explained in detail with reference to FIGS. 2 to 4. FIG. 2 is a top view of the spacer, and 14 is an elastic insulating sheet that serves as the base material of the spacer.
Adhesive coatings 11 and 15 are formed in stripes on both the front and back surfaces of the insulating sheet 14, leaving slit-like gaps 12. 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 in the gap 12. Reference numeral 13 denotes a through hole formed at a position where the switch is disposed, and the through hole 13 crosses any of the gaps 12 and penetrates the coating films 11, 15 and the insulating sheet 14 from the front and back. It is formed.

The pattern of the gaps 12 may be formed in a striped pattern as described above, or may be formed in a cross-lattice pattern if necessary. Furthermore, as mentioned above, the gap 12 is formed in both the coating films 11 and 15;
If necessary, it may be formed only on one of them. Note that FIG. 3 shows a cross section taken along the line AA in FIG. 2, and FIG. 4 shows the structure in the vicinity of the hole 13. A flexible insulating sheet as shown in FIG. 1 having upper and lower electrodes is pasted on the adhesive coatings 11 and 15, and these are supported on a fixed plate to finally form a planar switch. It is formed. In this case, hole 13 is above the switch.
Gap 1 becomes a gutter-like air gap for the lower electrode response.
The end of 2 is led out of the switch and becomes a ventilation hole. According to the present invention as described above, there is no need to individually drill ventilation holes for each switch in the fixing plate etc. as in the past, and these can be formed all at once at the stage of forming the adhesive coating. Moreover, if this is formed into a striped or grid pattern as described above, it becomes possible to selectively form a switch key at any position, which facilitates the standardization and mass production of spacers, and improves management. It also has many practical advantages, including being extremely convenient. In addition, the adhesive coating was originally an insulating sheet with electrodes attached to the spacer 14.
This is necessary for fixing the material to the surface, and it does not increase the number of steps.

[Brief explanation of drawings]

Fig. 1 is a side sectional view of the conventional example, Fig. 3 and the following are related to the present invention, Fig. 2 is a top view of the spacer, Fig. 3 is a side sectional view of the spacer, and Fig. 4 is a perspective view of the main parts. It is. 2, 5... Electrode, 11, 15... Adhesive coating film,
12, 16...Gap, 13...Through hole, 14...
An insulating sheet that serves as a spacer.

Claims (1)

[Scope of utility model registration request] Apply adhesive to at least one side of the opposite surfaces of an elastic insulating sheet to a uniform film thickness, leaving gaps of a predetermined width in a striped or lattice pattern, and apply adhesive to any part of the insulating sheet including the gaps. A through hole of an arbitrary shape is formed by punching out the adhesive film and the insulating sheet at the position, and the through hole serves as a gap for the upper and lower electrode responses,
A spacer for a planar switch, characterized in that the gap portion is used as a ventilation hole.