Key switch
AssigneeTopre Corporation
InventorHiroshi Hasegawa
Life of this patent
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Abstract
A key switch including a substrate prepared from dielectric material, and first and second electrodes respectively formed on the bottom and top surfaces of the substrate to constitute a capacitor together with the substrate. The first electrode is electrically connected to a pulse voltage signal oscillator, thereby pulsatively storing a static capacitance between the first and second electrodes. A first fixed contact electrically connected to the second electrode is provided on that portion of the surface of the substrate. A second fixed contact is positioned near the first fixed contact. The first and second fixed contacts are electrically connected or shut by a manually operable movable conductive rubber contact.
Claims11
A key switch interposed between a pulse generator and receiver circuit, comprising:
- a substrate prepared from dielectric materials and having opposed first and second surfaces;
- a first electrode formed on the first surface of the substrate and adapted to be electrically connected to one of the pulse generator and the receiver circuit;
- a second electrode provided on the second surface of the substrate opposite to the first surface thereof to constitute a capacitor for pulsatively storing a static capacity in cooperation with the first electrode and substrate;
- a first fixed contact formed on one of said first and second surfaces of the substrate in electric contact with the electrode positioned on said one surface;
- a second fixed contact formed on said one surface of the substrate in the proximity of said first fixed contact and adapted to be in electric connection to other of said pulse generator and said receiver circuit;
- and
- changeover means for effecting electric connection and disconnection between said first and second fixed contacts thereby to connect said pulse generator to said receiver circuit via said capacitor.
Dependencies are inferred from the claim text.