Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
Kenichi Matsushima0
Date of Patent
January 31, 2012
0Patent Application Number
121500640
Date Filed
April 24, 2008
0Patent Citations Received
Patent Primary Examiner
Patent abstract
A proximity detector detects the approach of an object based on a stray capacitance. A differential electrode has an apparent stray capacitance that varies in response to an approaching object. An individual capacitance detector detects an individual stray capacitance of the differential electrode based on a stray capacitance of the differential electrode obtained by repeatedly charging and discharging the differential electrode in opposite phases and based on a stray capacitance of the differential electrode obtained by repeatedly charging and discharging the differential electrode in the same phase. A proximity calculator detects the approach of the object based on the detected individual stray capacitance.
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