Object position detector

Details Object position detector Object position detector

1993-08-31

1994-12-20

Chin, Stephen

Telegraphy

Systems

Position coordinate determination for writing

341 33, G08C 2100, H03M 1100

Patent

active

053747879

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: 4733222 (1988-05-01), Evans
patent: 5194862 (1993-05-01), Edwards

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