Capacitance-based proximity with interference rejection apparatus and methods
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United States of America Patent
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Oct 15, 1996
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app pub date -
Dec 7, 1994
filing date -
Jul 13, 1992
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Abstract
Apparatus and method for a capacitance-based proximity sensor with interference rejection. A pair of electrode arrays establish a capacitance on a touch detection pad, the capacitance varying with movement of a conductive object near the pad. The capacitance variations are measured synchronously with a reference frequency signal to thus provide a measure of the position of the object. Electrical interference is rejected by producing a reference frequency signal which is not coherent with the interference.
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