Object position detector with edge motion feature

Details Object position detector with edge motion feature Object position detector with edge motion feature

1994-09-02

1996-08-06

Chin, Stephen

Telegraphy

Systems

Position coordinate determination for writing

345174, 341 33, G08C 2100, G09G 500

Patent

active

055435904

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 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. Noise reduction and background level setting techniques inherently available in the architecture are employed.

REFERENCES:
patent: 4935728 (1990-06-01), Kley
patent: 5194862 (1993-03-01), Edwards
patent: 5327161 (1994-07-01), Logan et al.

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