Capacitive sensor device
First Claim
1. A capacitive sensor device comprising a delay circuit comprising a sense electrode coated with a dielectric film;
- a reference signal source for providing input to said delay circuit;
a detector circuit for detecting delay time of an output signal which is derived rom said delay circuit in response to the reference signal source, wherein the delay time of signal generated by placing an object under detection on the dielectric film is converted to voltage in said detector circuit.
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Accused Products
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.
64 Citations
5 Claims
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1. A capacitive sensor device comprising a delay circuit comprising a sense electrode coated with a dielectric film;
- a reference signal source for providing input to said delay circuit;
a detector circuit for detecting delay time of an output signal which is derived rom said delay circuit in response to the reference signal source, wherein the delay time of signal generated by placing an object under detection on the dielectric film is converted to voltage in said detector circuit. - View Dependent Claims (2, 3, 4, 5)
- a reference signal source for providing input to said delay circuit;
Specification