Graphic communication apparatus

Details Graphic communication apparatus Graphic communication apparatus

1979-11-13

1981-09-15

Robinson, Thomas A.

Telegraphy

Systems

Position coordinate determination for writing

G08C 2100

Patent

active

042899273

ABSTRACT:
Graphic communication apparatus for electronically writing information and transmitting includes a pen having a pair of windings disposed in a predetermined angular relation with respect to each other, and a writing surface having a plurality of windings arranged substantially parallel to each other for sensing the presence of the pen from the magnetic fields of the pen coils to provide differential outputs over the writing surface with respect to the windings of the pen apparatus, and the differential outputs being located with respect to the writing surface in an X--Y orientation.

REFERENCES:
patent: 4088842 (1978-05-01), Ikedo
patent: 4185165 (1980-01-01), Fencl

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