Pressure sensitive scrollbar feature
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United States of America Patent
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Mar 30, 1999
Issued Date -
N/A
app pub date -
Nov 13, 1995
filing date -
Jun 8, 1992
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A proximity sensor system includes a sensor matrix array having a characteristic capacitance on horizontal and vertical conductors connected to sensor pads. The capacitance changes as a function of the proximity of an object or objects to the sensor matrix. The change in capacitance of each node in both the X and Y directions of the matrix due to the approach of an object is converted to a set of voltages in the X and Y directions. These voltages are processed by circuitry to develop electrical signals representative of the centroid of the profile of the object, i.e, its position in the X and Y dimensions. Noise reduction and background level setting techniques inherently available in the architecture are employed.
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