Capacitance detection apparatus

专利名称：Capacitance detection apparatus发明人：KURACHI, Kohei,INABA, Hisashi申请号：EP06100760.5申请日：20060124公开号：EP1686543A1公开日：20060802

专利附图：

摘要：A capacitance detection apparatus (100) for detecting an approaching object onthe basis of a capacitance change includes a detection electrode (1), a calculating circuit(12) for calculating a value (C) associated with the capacitance change, a judging circuit(14) 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 capacitancedetection apparatus, an initial reference value-determining circuit (16) for determining aninitial reference value (C0), a difference calculating circuit (17) for calculating a difference(ΔC) between the normal value and a value calculated earlier than the normal value by apredetermined period of time or between the initial value and the initial reference value,and a determining circuit (18) for determining whether the object is approaching bycomparing the difference with a predetermined threshold value.

申请人：AISIN SEIKI KABUSHIKI KAISHA

地址：1, Asahi-cho 2-chome Kariya-shi, Aichi-ken 448-8650 JP

国籍：JP

代理机构：TBK-Patent

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