Capacitance-based proximity with interference rejection apparatu

Details Capacitance-based proximity with interference rejection apparatu Capacitance-based proximity with interference rejection apparatu

1994-12-07

1996-10-15

Chin, Stephen

Telegraphy

Systems

Position coordinate determination for writing

345174, G08C 2100

Patent

active

055656587

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.

REFERENCES:
patent: 4237421 (1980-12-01), Waldron
patent: 4371746 (1983-02-01), Pepper, Jr.
patent: 4476463 (1984-10-01), Ng et al.
patent: 4845682 (1989-07-01), Boozer et al.
patent: 5053757 (1991-10-01), Meadows
patent: 5305017 (1994-04-01), Gerpheide

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