CAPACITANCE SENSOR

WIPO Patent Application WO/2022/201747

A1

This capacitance sensor comprises: one or a plurality of front side electrodes including one or more detection electrodes; an elastic conductor provided below the one or plurality of front side electrodes; a shield electrode that is provided between the one or plurality of front side electrodes with the the elastic conductor therebetween; a first voltage output unit that outputs a first AC voltage to a driving unit connected between the one or more detection electrodes, with a capacitance interposed therebetween; a second voltage output unit that outputs a second AC voltage that has a frequency substantially equal to a frequency of the first AC voltage and that is to be applied to the one or more detection electrodes; a third voltage output unit that outputs, to the shield electrode, a third AC voltage that has a frequency substantially equal to the frequencies of the first AC voltage and the second AC voltage; and a detection unit that detects approach, contact, and pressing of a detection target on the one or more detection electrodes. The first voltage output unit, the second voltage output unit, and the third voltage output unit output the first AC voltage, the second AC voltage, and the third AC voltage, respectively, where an amplitude of the first AC voltage is greater than or equal to an amplitude of the second AC voltage and also an amplitude of the third AC voltage is less than the amplitude of the second AC voltage.

FUJIYOSHI TATSUMI (JP)
SUZUKI TETSUYA (JP)
HIGUCHI SHINICHI (JP)
TANIGUCHI YOSHINAO (JP)

PCT/JP2022/000584

September 29, 2022

January 11, 2022

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ALPS ALPINE CO LTD (JP)

H01H36/00

JP2016195018A	2016-11-17
JP2012243566A	2012-12-10

ITOH, Tadashige et al. (JP)

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