Graphical input devices

Details Graphical input devices Graphical input devices

1977-03-28

1978-08-29

Robinson, Thomas A.

Telegraphy

Systems

Position coordinate determination for writing

178 18, G08C 2100

Patent

active

041105567

ABSTRACT:
A graphical input device is described which has a large surface divided into main regions and a small cursor divided into sub-regions. In one embodiment both the large surface and the cursor contain conductors to sense the position of a stylus used for indicating points in the large surface but the conductors of the large surface are widely spaced compared with those of the cursor. In operation the cursor is placed over a point whose position is required in the form of electrical signals and the stylus is used to indicate the point. In another embodiment only the cursor contains conductors, the large surface being divided by lines, and the position of the cursor being recorded by an operator.

REFERENCES:
patent: 3665102 (1972-05-01), Townsend et al.
patent: 3832693 (1974-08-01), Ishizaki et al.
patent: 4022969 (1977-05-01), McKinlay et al.
patent: 4029899 (1977-06-01), Gordon

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