Capacitance detecting proximity sensor
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United States of America Patent
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Jun 9, 2009
Grant Date -
Nov 9, 2006
app pub date -
Dec 25, 2003
filing date -
Dec 25, 2002
priority date (Note) -
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Abstract
A capacitance detecting proximity sensor forms a proximity detection range in a spatially open region, avoids the effects resulting from peripheral objects outside the detection target, and enables proximity detection with few malfunctions. The proximity sensor includes: a first detection electrode and a second detection electrode that are disposed to have a predetermined range difference h with respect to a detection direction Y in which a detection subject comes into proximity to the proximity sensor and are independent from a ground potential; and a proximity detection circuit that outputs, as a proximity detection output, the difference between a capacitance to ground Ca formed by the first detection electrode and a capacitance to ground Cb formed by the second detection electrode.
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