Capacitive sensor device
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United States of America Patent
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N/A
Issued Date -
May 15, 2003
app pub date -
Nov 5, 2002
filing date -
Nov 13, 2001
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A capacitive sensor device comprises a delay circuit comprising either a sense electrode made from a material of high resistance and covered with a dielectric film or a sense electrode covered with a dielectric film and a resistor connected to the sense electrode; a reference signal source for providing input to the delay circuit; and a detector circuit for detecting delay time of output signal which is derived from the delay circuit in response to the reference signal source, wherein delay time of a signal which is produced by placing an object under detection on the dielectric film is converted to voltage in the detector circuit.
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