Capacitive sensor and grip sensor
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorsYuta Okazaki, Hiroshi Naitou, Tsuyoshi Nishio
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Abstract
Capacitive sensor includes sensor electrode, sensor circuit that is electrically connected to sensor electrode measures capacitance of sensor electrode, first impedance element, noise detection circuit that is electrically connected to sensor electrode through first impedance element and measures noise, and control circuit that switches between on and off of each of sensor circuit and noise detection circuit. Control circuit causes sensor circuit to measure the capacitance of sensor electrode by turning on sensor circuit and by turning off noise detection circuit and control circuit causes noise detection circuit to measure the noise by turning off sensor circuit and by turning on noise detection circuit.
Claims5
A capacitive sensor comprising:
- a sensor electrode;
- a sensor circuit;
- a first impedance element;
- a noise detection circuit;
- and
- a control circuit,
- wherein the sensor circuit is electrically connected to the sensor electrode and measures capacitance of the sensor electrode,
- the noise detection circuit is electrically connected to the sensor electrode through the first impedance element and measures noise with respect to the capacitance,
- the control circuit causes the sensor circuit to measure the capacitance of the sensor electrode by turning on the sensor circuit and by turning off the noise detection circuit, and
- the control circuit causes the noise detection circuit to measure the noise by turning off the sensor circuit and by turning on the noise detection circuit.
Dependencies are inferred from the claim text.