Electrographic apparatus

Details Electrographic apparatus Electrographic apparatus

1985-06-07

1987-03-10

Schreyer, Stafford D.

Telegraphy

Systems

Position coordinate determination for writing

178 19, G08C 2100

Patent

active

046492321

ABSTRACT:
An electrographic apparatus and system utilizing a resistive layer having an active area which operates in conjunction with a stylus or tracer or other suitable position locator. An a.c. source or alternatively a signal treatment means is connected to the resistive layer through rows of electrodes. Improved accuracy is achieved through the use of electrodes at the ends of the electrode rows and through the use of an enhanced conductivity region which also allows the boundary of the active area to be placed in close proximity to the electrodes.

REFERENCES:
patent: 3449516 (1969-06-01), Cameron et al.
patent: 3591718 (1971-07-01), Asano et al.
patent: 4435616 (1984-03-01), Kley
patent: 4523654 (1985-06-01), Quagle et al.

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