Graphical data entry pad

Details Graphical data entry pad Graphical data entry pad

1976-08-09

1978-03-14

Robinson, Thomas A.

Telegraphy

Systems

Position coordinate determination for writing

G08C 2100

Patent

active

040791947

ABSTRACT:
A data entry pad for the entry of two-dimensional graphical data to a communication system includes a resistive grid area to which a conductive layer may be selectively contacted so that graphical data can be generated by external resistance measuring electronic circuitry. The resistive grid area is formed by a pattern of resistive inking on a base and is separated from the conductive layer by a foamed thermoplastic insulating separator. High resistance bands surround the grid area so as to linearize its output values.

REFERENCES:
patent: 3591718 (1971-07-01), Asano et al.
patent: 3798370 (1974-03-01), Hurst
patent: 3894183 (1975-07-01), Barish
patent: 3914548 (1975-10-01), Barish

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