Electricity: circuit makers and breakers – Capacitive switch
Reexamination Certificate
2007-01-26
2010-12-14
Friedhofer, Michael A. (Department: 2833)
Electricity: circuit makers and breakers
Capacitive switch
C341S033000, C345S173000
Reexamination Certificate
active
07851720
ABSTRACT:
A capacitive touch switch which is used, for example, in a control device for an electronic domestic appliance, includes a sensor area as part of a capacitive sensor element having a capacitance which changes when touched. A measuring electrode, which is coupled to the sensor area, is disposed on a printed circuit board and is at a first potential. An additional electrode, which is disposed near the measuring electrode, likewise on the printed circuit board, is electrically insulated from the measuring electrode and is at a second potential, which is different from the first potential. The additional electrode brings about a shielding of the measuring electrode and thus an output signal of an associated sensor circuit that is less sensitive to interference. A circuit configuration for a capacitive touch switch and a control device for an electronic domestic appliance, are also provided.
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Diehl Ako Stiftung & Co. KG
Friedhofer Michael A.
Greenberg Laurence A.
Locher Ralph E.
Stemer Werner H.
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