Capacitance switching device for keyboard

Abstract

Disclosed is a capacitance keyboard switching device comprising a fixed electrode formed on one surface of a first insulating film, a movable electrode formed on one surface of a second insulating film, a spacer interposed between the first and second insulating films and provided with a switching opening formed through the spacer for allowing the fixed and movable electrodes to come close to and separate from each other with one of the first and second insulating films interposed between the fixed and movable electrodes, a movable electrode depressing member provided with a depressing portion for depressing the movable electrode to cause the movable electrode to come close to the fixed electrode through the one insulating film, in order to keep the movable electrode flat when the movable electrode is depressed toward the fixed electrode, the depressing portion is provided with a surface area selected to be larger than a surface area of the movable electrode so that the surface area of the depressing member completely covers the surface area of the movable electrode when the depressing portion depresses the movable electrode, or the second insulating film is provided with slots formed therein.

Dependencies are inferred from the claim text.