Capacitive touch switch

Details Capacitive touch switch Capacitive touch switch

H - Electricity

03

K

H03K 17/96 (2006.01) D06F 33/02 (2006.01) H05B 1/00 (2006.01) A47L 15/46 (2006.01) F24C 7/08 (2006.01)

Patent

CA 2573163

A capacitive touch switch (10), which is used for example in a control device for an electronic domestic appliance, contains a sensor area (12) as part of a capacitive sensor element, the capacitance (Cs) of which changes when touched; a measuring electrode (20), which is coupled to the sensor area (12), is arranged on a printed circuit board (18) and is at a first potential; and an additional electrode (24), which is arranged near to the measuring electrode (20) likewise on the printed circuit board (18), is electrically insulated from the measuring electrode (20) and is at a second potential, which is different from the first potential. The additional electrode (24) brings about a shielding of the measuring electrode (20) and thus an output signal of an associated sensor circuit that is less sensitive to interference.

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