Importance

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Abstract

A contact detection device includes: an AC power supply switching between and applying first and second AC voltages to first and second electrode layers; a storage part storing an alternative quadrature component corresponding to a state in which a conductor is in contact with an electrostatic sensor; a quadrature component comparison part comparing between a first quadrature component extracted upon applying the first AC voltage to the second electrode layer and a second quadrature component extracted upon applying the second AC voltage to the second electrode layer; and a contact determination part that detects contact of a conductor based on the first quadrature component when the first quadrature component and the second quadrature component fall within a first quadrature error, and detects contact of a conductor based on the alternative quadrature component when the first quadrature component and the second quadrature component fall outside the first quadrature error.

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First Claim