Ceramic resonance type electrostatic sensor apparatus
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United States of America Patent
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Jul 27, 1993
Grant Date -
N/A
app pub date -
May 18, 1990
filing date -
May 19, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A ceramic resonance type electrostatic sensor apparatus with an oscillator at a fixed frequency including a first ceramic resonator which has a fixed resonance frequency, a detecting unit for detecting a capacitance between the detecting unit and an object to be detected, a resonating circuit including a second ceramic resonator and having a resonance point which varies with the small change in capacitance detected by the detecting unit, a high impedance circuit connected between the oscillator and the resonating circuit, and a high impedance circuit connected between the resonating circuit and the detecting circuit.
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