Annular potentiometric touch sensor
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United States of America Patent
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Jun 30, 2009
Grant Date -
Apr 20, 2006
app pub date -
Dec 2, 2005
filing date -
May 18, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
The present invention determines angular position using a potentiometric touch sensor. The sensor has an annular pattern of resistive material on a portion of a bottom substrate top surface. Conductive drive lines and fixed potential conductive traces radially traverse the bottom substrate top surface and are electrically coupled to the resistive material. Conductive sense traces radially traverse the bottom substrate top surface. A conductive layer on a bottom surface of a top substrate is positioned above the bottom substrate top surface. A pressure applied to the top substrate and/or the bottom substrate electrically couples a portion of a conductive sense trace to a portion of the annular pattern and/or a fixed potential conductive trace. The angular position of the applied pressure is determined by measuring at least one electrical parameter between a conductive drive line and a conductive sense line having the conductive sense traces.
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