Position sensor
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United States of America Patent
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Mar 31, 2009
Grant Date -
Nov 25, 2004
app pub date -
May 21, 2002
filing date -
May 21, 2001
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A low cost x-y digitizing system is described for use in consumer electronic devices, such as portable digital assistants, mobile telephones, web browsers and the like. The digitizer includes a resonant stylus, an excitation winding for energizing the resonant stylus and a set of sensor windings for sensing the signal generated by the stylus, from which the x-y position of the stylus is determined. A novel stylus design is described together with novel digitizer windings and novel excitation and processing circuitry.
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