Telegraphy – Systems – Position coordinate determination for writing
Patent
1994-06-02
1996-02-27
Chin, Stephen
Telegraphy
Systems
Position coordinate determination for writing
345173, 341 33, G08C 2100, H03M 1100
Patent
active
054950775
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.
REFERENCES:
patent: 5374787 (1994-12-01), Miller et al.
Allen Timothy P.
Bisset Stephen
Miller Robert J.
Steinbach Gunter
Chin Stephen
Kim Kevin
Synaptics Inc.
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