JPS6233230Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a key input device in which a key spacer is inserted between a board having fixed contacts and a board having movable contacts.

Conventionally, in the above-mentioned key input device, in order to increase the wiring density of a board provided with fixed contacts, a method has been adopted in which wiring patterns are formed on both sides of the board.

However, in order to form a double-sided substrate, through-holes must be formed in the substrate and the through-holes must be plated, which inevitably increases costs.

Furthermore, in the case of this type of key input device, there is a tendency to use thin and flexible substrates in order to make them thinner and lighter, but because they are thin and flexible, it is difficult to form through holes. There was a manufacturing problem.

The present invention was developed in view of the conventional drawbacks and problems, and its purpose is to form a wiring pattern on a key spacer and to
By configuring this pattern so that it can be connected to the wiring pattern on the fixed contact board, wiring density can be increased without having to perform double-sided wiring, making device manufacturing significantly easier and significantly reducing manufacturing costs. The purpose of this invention is to provide a very practical key input device that can perform the following functions.

Hereinafter, one embodiment of the present invention will be described in detail using the drawings.

Although FIG. 1 shows a conventional spacer, according to the present invention, a wiring means is applied to the spacer as shown in FIG. 1 by the following procedure.

As shown in FIG. 2, a spacer particularly related to the present invention is formed by following the steps a→b→c. That is, a wiring circuit is formed on the film spacer 1 as shown in FIG. 2b. This is done by printing the conductive paint 2 using a printing method such as screen printing. Next, as shown in Figure c, an insulating paint 3 (a paint whose main component is resin, rubber, etc.) is printed on the portion of the conductive paint 2 to be insulated by a method such as screen printing.
Form an insulating part. Here, in order to keep the thickness of the spacer constant, the entire surface other than the connecting portion may be coated with an insulating paint.

3 and 4 are side sectional views of an embodiment in which a spacer formed by the procedure shown in FIG. 2 is used in a key input section.

In FIG. 3, reference numeral 4 indicates a hard substrate having a key contact electrode 5 on its surface, and reference numeral 6 indicates a conductive contact rubber (such as silicone rubber) on which a conductive member 7 for switching the key is formed. Reference numeral 5' denotes a contact portion for electrical connection with the exposed portion of the conductive paint 2 of the wiring circuit formed on the film spacer 1.
By making this electrical connection, a jumper effect of the board wiring by the wiring circuit of the film spacer can be obtained. At this time, the film spacer is brought into close contact with the substrate by a method such as pressure bonding or thermocompression bonding.

The one shown in FIG. 4 uses a flexible substrate 8, and the substrate 8 is provided with a conductive portion 9 for closing the key contact electrode. Further, 10 is a contact rubber.

As explained in detail above, according to the key input device of the present invention, when a wiring pattern is formed on a key spacer and the key spacer is superimposed on a fixed contact board, the wiring pattern on the key spacer is Since the contact portions are formed on the fixed contact substrate, the wiring density of the substrate can be significantly increased without providing any wiring patterns on both sides of the substrate.

Therefore, it is possible to provide a very practical key input device, which can significantly simplify the manufacturing of the device and significantly reduce the manufacturing cost.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a conventional spacer, Fig. 2 is a plan view showing the manufacturing procedure of a spacer of one embodiment of the key input device according to the present invention, and Figs. 3 and 4 are the key input device according to the present invention. FIG. 3 shows a side cross-sectional view of an embodiment of the invention. In the figure, 1... film spacer, 2... conductive paint, 3... insulating paint, 4... hard substrate, 5...
... Key contact electrode, 6 ... Conductive contact rubber, 7 ... Conductive member, 8 ... Flexible substrate,
9... Conductive part, 10... Contact rubber.

Claims (1)

[Claims for Utility Model Registration] In a key input device in which a key spacer is inserted between a board with fixed contacts and a board with movable contacts, a wiring pattern is formed on the key spacer. ,
Insulating treatment is applied to the surface of the pattern except for the terminal portion, and when the key spacer is inserted between the two boards, the contact portion that comes into contact with the wiring pattern terminal portion on the key spacer is connected to the fixed contact. A key input device characterized in that the wiring pattern on the key spacer and the wiring pattern on the fixed contact substrate are connected via the contact portion.