Object position and proximity detector
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United States of America Patent
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Feb 27, 1996
Issued Date -
N/A
app pub date -
Jun 2, 1994
filing date -
Jun 8, 1992
priority date (Note) -
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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 analog 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. The profile of position may also be integrated to provide Z-axis (pressure) information.
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