JPS614116A - 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 Field of the Invention The present invention relates to a keyboard switch used particularly in an input device for a terminal of office automation equipment.

Conventional Structures and Their Problems In recent years, keyboard switches used in terminal input devices for computer equipment are required to be low-cost and highly reliable.

A conventional configuration is shown in FIGS. 1 and 2. In FIG. 1, a film 2 is provided on a substrate 6, and fixed contacts 4 connected by a conductor pattern are provided on the film 2.

An opening 5 is formed on this film 2 at a portion corresponding to the fixed contact 4.
A movable contact 3 connected with a conductor pattern is provided on the bottom surface of the film 1 via a spacer 6 provided with an ai, and the film 1 is
It is operated by an opposing contact type keyboard switch with a key pad placed on the top. In FIG. 2, fixed contacts 9 are provided on an insulating substrate 8 and connected by a conductive pattern. A spacer 1 having an opening provided on the insulating substrate 8 at a portion corresponding to the fixed contact 9
This is a keyboard switch of a facing contact type, in which a film 11 is provided through the film 11, a movable contact 12 connected by a conductive pattern is provided on the lower surface of the film 11, and a keypad 13 is arranged on the upper part of the film 11.

In the configuration shown in FIG. 1, the films 1 and 2 required lead-out portions for the conductor patterns, and connectors were required for each. Further, since the conductor pattern is limited by its resistance value, it is necessary to use an expensive material such as silver for the conductor pattern on the films 1 and 2. In the configuration shown in Figure 2, the first
Similar to the configuration shown in the figure, the insulating substrate 8 and the film 11 required a portion for taking out the conductor pattern, and a connector was required for each. Furthermore, since the conductor pattern is limited by its resistance value, the conductor pattern of the film 11 must be made of an expensive material, such as silver. Further, the base plating of the fixed contacts 9 on the insulating substrate 8 is hard and contains a brightening agent, and the contact with the soft movable contacts is unstable and has a short lifespan.

OBJECTS OF THE INVENTION In view of the above-mentioned drawbacks, it is an object of the present invention to provide a short bar one-type keyboard switch that has a long life, high reliability, low cost, and high production efficiency.

Structure of the Invention To achieve this object, the keyboard switch of the present invention has at least a flexible surface on an insulating substrate;
Place a spacer with an opening on the side, place a film on the spacer, place a movable contact with at least a soft surface on the underside of the film, and attach it to the fixed contact. It is provided so as to face the movable contact, and furthermore, an elastic keypad is arranged on the second part of the film corresponding to the movable contact. With this configuration, a long life, high reliability, and low cost product can be obtained with high productivity by using all elastic parts.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 3 shows a keyboard switch in the first embodiment of the invention.

In FIG. 3, a pair of fixed contacts 14A and 14B are provided on an insulating substrate 16 and connected by a conductive pattern. No brightener is added to the base plating of the fixed contacts 14A, 14B, such as Ni plating, and carbon is printed on it to soften it. A spacer 19 having an opening 19kf in a portion corresponding to the 14 fixed contacts 14B is placed on the insulating substrate 16, a film 17 is placed through the spacer 19, and the fixed contacts 14A on the bottom of the film 17,
A single movable contact 1B made of carbon or the like with a soft surface is provided at a position facing the key 14B, and a keypad 16 made of an elastic material such as rubber is placed on top of the film 17.

As described above, according to this embodiment, when the film 17 is pressed with the keypad 16, the pair of fixed contacts 14A and 14B are short-circuited by the movable contact 18. A feature of this keyboard switch is that the keypad 16 has elasticity, which prevents chattering. By softening the base plating of the fixed contacts 14A and 14B and the material of the movable contacts, contact becomes stable, long life span, and high reliability. film 17
Since it is possible to eliminate the conductor pattern that connects the movable contact 18, the conductor pattern extraction part of the film 17 is not necessary, and since all the conductor patterns can be provided on the insulating substrate, conductor resistance is not a problem. do not.

Effects of the Invention As described above, the present invention enables a short bar one-type keyboard switch, which has a long life, high reliability, low cost, and has a small number of parts and high production efficiency. The effects are significant.

[Brief explanation of drawings]

1 and 2 are partially cutaway exploded front views of a conventional keyboard switch, respectively, and FIG. 3 is a partially cutaway exploded front view of an embodiment of the keyboard switch of the present invention. 14A, 14B... Fixed contact, 16...
... Insulating base L16 ... Keypad, 1st ...
...Film, 18...Movable contact, 19...
...Spacer, 19A...Opening. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 Figure 7qc 1'lB

Claims (1)

[Claims] A fixed contact having at least a soft surface is provided on an insulating substrate, a film having at least a movable contact having a soft surface is arranged above the insulating substrate through a spacer having an opening corresponding to the fixed contact, and A keyboard switch comprising an elastic keypad arranged above the film in correspondence with a movable contact.