Electronic graphics pad

Details Electronic graphics pad Electronic graphics pad

1976-10-18

1978-03-07

Robinson, Thomas A.

Telegraphy

Systems

Position coordinate determination for writing

250210, G08C 906, G08C 2100

Patent

active

040781518

ABSTRACT:
A graphics panel is disclosed which translates any random trace of a point light source across the panel into voltage indicative of orthogonal components of the displacement of the light source. By means of such electrical signals a replica of the trace of the light source may be generated by a cathode ray tube, X-Y Plotter, or similar analog devices. The display panel is a flat planar structure composed of transparent plastic material having one side rendered opaque. A plurality of photoconductors are arrayed along the peripheral side of the panel and appropriate electrical circuits incorporating the photoconductors convert the current generated thereby into the voltages proportional to the displacement of the light source along orthogonal axes in the plane of the panel.

REFERENCES:
patent: 3613066 (1971-10-01), Cooreman

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