Graphical input terminal

Details Graphical input terminal Graphical input terminal

1974-02-01

1976-05-25

Robinson, Thomas A.

Telegraphy

Systems

Position coordinate determination for writing

G08C 2100

Patent

active

039595854

ABSTRACT:
A graphical input terminal includes a pair of resistive sheets separated by an air gap. An energizing voltage is alternately applied to each sheet while an output voltage representative of the position of contact between the sheets caused by the pressure of a stylus, is derived from the nonenergized sheet. A circuit for indicating stylus up/stylus down status without undue interference from capacitively induced voltages is also provided.

REFERENCES:
patent: 2975235 (1961-03-01), Leitner et al.
patent: 3005050 (1961-10-01), Koenig, Jr.
patent: 3662105 (1972-05-01), Hurst et al.
patent: 3798370 (1974-03-01), Hurst
patent: 3885097 (1975-05-01), Pobgee

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