Touch sensor, sanitary fitting with touch sensor and method of detecting a touch on an electrically conductive surface
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United States of America Patent
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May 11, 2004
Grant Date -
Sep 20, 2001
app pub date -
Mar 7, 2001
filing date -
Mar 8, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A touch sensor with a sensor surface insulated with respect to ground potential, the sensor surface being connected via a measuring resistor to an a.c. voltage generator, and the voltage across the measuring resistor being used as a difference measuring signal. At least one touch sensor can advantageously be integrated in a sanitary fitting and used to control solenoid valves on water feeds of the fitting. An operating element of the fitting is used as a sensor surface and is connected via a connecting cable to control electronics of the sensor. A method of detecting a touch on an electrically conductive surface, a capacitive touch sensor being used which detects the complex conductance of a human body. The touch detection is carried out by measuring and evaluating a current flow in the direction from the sensor to the person who touches the sensor surface and/or in the direction from the person into the sensor.
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