Keyswitch with decoupling diode
AssigneeSiemens Aktiengesellschaft
InventorBernhard Edel
Life of this patent
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Abstract
A keyswitch for use with keyboards for connecting intersecting row and column wires of a circuit board for the keyboard has a decoupling diode for preventing the generation of false signals which may prevent a clear identification of the keyswitch which has been activated upon the simultaneous actuation of several keyswitches. The decoupling diode is integrated in the movable contact bridge of the keyswitch so that no soldering need be undertaken on the circuit board for the keyboard.
Claims7
In an actuator in a keyswitch formed by a keyboard having a matrix of intersecting row wires and column wires disposed on a circuit board, one said actuator being disposed at each point of intersection between a row wire and a column wire for making a connection therebetween upon depression of said actuator, said actuator having an elastomeric sheet with a contact bridge carried on an underside thereof for making an electrical connection between a row wire and a column wire upon actuation of said keyswitch, the improvement comprising:
- a decoupling diode integrated in said contact bridge and disposed for making a series connection between said row wire and said column wire upon depression of said actuator for preventing generation of a false contact signal upon the simultaneous actuation of more than one actuator.
Dependencies are inferred from the claim text.