05374787 is referenced by 472 patents and cites 2 patents.

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.

Title
Object position detector
Application Number
895934
Publication Number
5374787
Application Date
August 31, 1993
Publication Date
December 20, 1994
Inventor
Gunter Steinbach
Palo Alto
CA, US
Timothy P Allen
Los Gatos
CA, US
Stephen Bisset
Palo Alto
CA, US
Robert J Miller
Fremont
CA, US
Agent
D Alessandro Frazzinni & Ritchie
Assignee
Synaptics
CA, US
IPC
H03M 11/00
G08C 21/00
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