Graphical input apparatus for electrical equipment

Details Graphical input apparatus for electrical equipment Graphical input apparatus for electrical equipment

1978-03-08

1979-08-14

Robinson, Thomas A.

Telegraphy

Systems

Position coordinate determination for writing

G08C 2100

Patent

active

041646223

ABSTRACT:
A graphical input tablet is disclosed in which a sheet of resistive material is stretched across a surface comprising parallel conductors on, but insulated from, a resistive layer. Currents are passed alternately through the resistive layer and means which places the conductors at different graduated voltages. Thus when a stylus used to indicate a point causes the sheet to bridge the resistive layer to one of the conductors, alternate voltages representative of two co-ordinates of the position of the point are developed.

REFERENCES:
patent: 2907824 (1959-10-01), Peek, Jr.
patent: 2975235 (1961-03-01), Leitner et al.
patent: 3304612 (1967-02-01), Proctor et al.
patent: 3308253 (1967-03-01), Krakinowski
patent: 3440522 (1969-04-01), Kruse
patent: 3885097 (1975-05-01), Pobgee
patent: 3925610 (1975-12-01), French et al.
patent: 3959585 (1976-05-01), Mattes et al.
patent: 4013835 (1977-03-01), Eachus et al.
patent: 4080514 (1978-03-01), Pobgee

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