Importance

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Abstract

A capacitance detection apparatus includes a detection electrode for detecting approach of an object on the basis of a change of capacitance, a calculating circuit for calculating a value associated with the capacitance change, a judging circuit for judging whether the calculated value is a normal or initial value calculated after or before a predetermined period of time lapse from a start time of the capacitance detection apparatus, an initial reference value-determining circuit for determining an initial reference value, a difference calculating circuit for calculating a difference between the normal value and a value calculated earlier than a time when the normal value is calculated by the predetermined period of time or longer or between the initial value and the initial reference value, and a determining circuit for determining whether the object is approaching by comparing the difference with a predetermined threshold value.

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First Claim