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Abstract

A capacitive sensor has: one or more front-side electrodes including at least one detection electrode; an elastic dielectric body disposed below the front-side electrodes; a shield electrode disposed below the elastic dielectric body; a first, second, and third voltage output unit that respectively outputs a first, second, and third AC voltage; and a detection unit that detects a proximity, a contact, and pressing of a detection target to the detection electrode. The first, second, and third AC voltages have substantially the same frequency. The amplitude of the first AC voltage is larger than or equal to the amplitude of the second AC voltage. The amplitude of the third AC voltage is smaller than the amplitude of the second AC voltage. The first AC voltage is output to a driving unit coupled to the detection electrode with capacitances intervening between them. The second AC voltage is applied to the detection electrode.

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First Claim