Capacitive sensor
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United States of America Patent
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Apr 7, 2009
Issued Date -
N/A
app pub date -
Feb 11, 2005
filing date -
Feb 13, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
A capacitive sensor for detecting the presence of an object adjacent a panel is described. The sensor comprises an electrically conducting sensor element coupled to a capacitance measurement circuit. In use, the capacitive sensor is mounted with the sensor element adjacent an underside of the panel. The sensor element includes a flared portion which deforms when pressed against the panel to provide an extended contact area between the sensor element and the panel. When a user touches an upper side of the panel above the extended contact area, the capacitance of the sensor element is modified. This is detected by the measurement circuit and identifies a touch.
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