EXCITATION PHASE DETECTING CAPACITANCE-TYPE POSITION TRANSDUCER
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United States of America Patent
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Issued Date -
Sep 9, 2010
app pub date -
Nov 24, 2009
filing date -
Mar 9, 2009
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An excitation phase detecting capacitance-type position transducer comprises a stationary part having a plurality of excitation electrode groups and a movable part having a plurality of coupling electrodes. The capacitance-type position transducer detects a signal of which phase varies according to the relative positions of the movable part with respect to the stationary par and calculates an intra-period phase angle φ from two excitation signals having a phase difference of 90° captured at a zero-cross point of the detection signal.
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