JPS59209220A - Keyboard switch - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a keyboard switch using pressurized conductive rubber, and aims to provide an inexpensive and long-life keyboard switch.

As shown in FIG. 1, a conventional keyboard switch using pressurized conductive rubber has a conductive pattern 3 on the top surface of a printed circuit board 1. 4. 5. 6 was formed by printing or the like, and a pressurized conductive rubber sheet 2 was arranged on the upper surface of this printed circuit board 1.

In such a configuration, especially in a keyboard switch with a high packaging density, the through hole 8 and the back pattern 7 are required when the conductive pattern 3 and the conductive pattern 6 are short-circuited.

As mentioned above, conventional keyboard switches use an expensive pressurized conductive rubber sheet 2 and a through-hole double-sided printed circuit board 1.
had to be used, and the material cost alone was extremely expensive.

The present invention aims to eliminate the above-mentioned drawbacks of the conventional keyboard switch, and provides a keyboard switch that is sealed, has a long life, is non-contact type, and is inexpensive.

Embodiments of the present invention will be described below with reference to FIGS. 2 to 6.

First, in the embodiment shown in FIGS. 2 and 3, 9.10
is a plastic film, and conductive patterns 711 & 11 are provided on opposing surfaces of the plastic films 9 and 1o.
b, 12J 12b is formed by printing or the like, and an insulator is formed between the plastic films 9 and 10, and the plastic film 9.10 (7) conductive pattern/11
a, 11b and 12a.

A spacer 14 having a plurality of through holes 13 is interposed at the intersection of the spacer 12b, and a pressurized conductive rubber 15 formed in a disk shape is fitted into the through holes 13 of the spacer 14. The pressurized conductive rubber 16 is formed to have the same thickness as the spacer 14, and an adhesive 16 is applied to the peripheral edge of the spacer 14, and plastic films 9 and 10 are attached to the spacer 14 to integrate them.

Furthermore, in the case shown in FIGS. 4 and 6, the plastic films 9 and 1o are integrally formed, and the plastic films 9 and 1o are integrally formed. Fold 10 in half and place pressurized conductive rubber 1 in between.
A pressurized conductive rubber 16 is interposed between a spacer 14 having a
and conductive pattern 11 on plastic film 9, 1Q.
a, 11b.

12&, 12b electrically with conductive adhesive 17.

They are mechanically connected to form no contact points, thereby eliminating mechanical wear between the pressurized conductive rubber 15 and the conductive putters/11a, 11b, 12a, 12b.

Further, the embodiment shown in FIG. 6 has the structure shown in FIGS. 4 and 5, but a diaphragm 19 having a spherical curved portion 18 is arranged in a portion corresponding to the pressurized conductive rubber 15, and the diaphragm 19 has a spherical curved portion 18. The conductive patterns 11a, 11b, 12a, and 12b provided on the plastic films 9 and 1o are configured to perform a click action by pressing the part 1 and reversing them. It can also be constructed by pasting foil.

Since the keyboard switch of the present invention is constructed as described above, it is possible to use expensive pressurized conductive rubber in the form of disks for the number of keyboards, and also eliminates the need for expensive through-hole double-sided printed circuit boards, reducing costs. They can be extremely advantageous, can be sealed, have a long life with sufficient resistance to gas, dust, oil, and even moisture, and are non-contact and resistant to mechanical wear. It has the advantage of being able to improve reliability by reducing noise, and is of great practical value.

[Brief explanation of drawings]

Figure 1 is an exploded perspective view of a conventional keyboard switch.
FIG. 2 is a sectional view showing one embodiment of the keyboard switch of the present invention, FIG. 3 is an exploded perspective view of the same, FIG. 4 is a perspective view of another embodiment, FIG. 5 is a sectional view of the same, and FIG. is a sectional view of still another embodiment. 9.1o...Plastic film, 11a. 11b, 121L, 12b... conductive pattern,
13...A hole, 14...Spacer, 1
6... Pressurized conductive rubber, 16... Adhesive, 17... Curved portion, 19... Diaphragm. Name of agent: Patent attorney Toshio Nakao and 1 other person 1st
Figure 3: Mochihan Showa 59-209220 (3) Figure 4

Claims (3)

[Claims] (1) A keyboard switch 0 in which a spacer with a through hole for storing pressurized conductive rubber at the intersection of the conductive patterns is arranged between plastic films with conductive patterns formed on opposing surfaces. (2) A keyboard switch according to claim 1, wherein a conductive pattern and a pressurized conductive rubber are bonded together with a conductive adhesive. (3) The keyboard switch according to claim 1, further comprising a diaphragm having a spherical curved portion that performs a click action by pressing against a portion corresponding to the pressurized conductive rubber.