CAPACITANCE-COUPLED ELECTROSTATIC SENSOR

PROBLEM TO BE SOLVED: To provide a capacitance-coupled electrostatic sensor which offers enhanced sensitivity and a significant reduction in external noise influence and is capable of accurately determining ON and OFF of a switch.SOLUTION: Current flowing between a plurality of switch electrodes and...

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Bibliographische Detailangaben
Hauptverfasser:	IKEDA NORIMASA, TAKIMOTO TOSHIHIRO, KADOI HIDEO
Format:	Patent
Sprache:	eng
Schlagworte:	ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVEREDIN A SINGLE OTHER SUBCLASS MEASURING MEASURING ANGLES MEASURING AREAS MEASURING IRREGULARITIES OF SURFACES OR CONTOURS MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR PHYSICS TARIFF METERING APPARATUS TESTING
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a capacitance-coupled electrostatic sensor which offers enhanced sensitivity and a significant reduction in external noise influence and is capable of accurately determining ON and OFF of a switch.SOLUTION: Current flowing between a plurality of switch electrodes and a conductive member is converted to voltage by a current-voltage conversion circuit 16, and a signal generated by an oscillator 9 is converted to synchronized sin and cos signals by synchronized oscillator circuits 10, 11. The sin signal and cos signal are each multiplied with the converted voltage by multiplier circuits 19, fed to low pass filters 21 to be smoothed, and then converted to a DC signal. The converted DC voltage is measured and compared with a threshold value stored in an arithmetic unit.