Graphical input device with rules

Details Graphical input device with rules Graphical input device with rules

1985-11-29

1987-08-25

Schreyer, Stafford D.

Telegraphy

Systems

Position coordinate determination for writing

G08C 2100

Patent

active

046894470

ABSTRACT:
A graphical input device having lines or rules visible through an input surface of a flexible sheet. The flexible sheet is at least partially transmissive to light and is located to face a base plate. The front surface of the flexible sheet is for entering graphical information and upon the rear surface is located the lines or rules. Resistive films are applied to both the base plate and the rear surface of the flexible sheet and the films face each other for facilitating the detection of coordinates associated with the graphical information entered on the front surface and for converting the coordinates to an electrical signal.

REFERENCES:
patent: 4164622 (1979-08-01), Pobgee
patent: 4484026 (1984-11-01), Thornburg

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