05841078 is referenced by 360 patents and cites 134 patents.

A proximity sensor system includes a sensor matrix array having a characteristic capacitance between 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.

Title
Object position detector
Application Number
895934
Publication Number
5841078
Application Date
October 30, 1996
Publication Date
November 24, 1998
Inventor
Stephen J Bisset
Los Altos
CA, US
Robert J Miller
San Jose
CA, US
Agent
D Alessandro & Ritchie
Assignee
Synaptics
CA, US
IPC
G08C 21/00
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