Coordinate position information output device

Details Coordinate position information output device Coordinate position information output device

1974-07-22

1976-03-16

Robinson, Thomas A.

Telegraphy

Systems

Position coordinate determination for writing

340324M, G08C 2100

Patent

active

039447405

ABSTRACT:
A coordinate position information output device is disclosed in which the impedance at a position addressed by a contact pen, a light pen, a magnetic pen or the like is varied; a forward current is caused to flow by the impedance change in a charge storage diode; and a backward current flowing in the charge storage diode for a moment immediately thereafter is utilized as coordinate position information.

REFERENCES:
patent: 3573542 (1971-04-01), Mayer et al.
patent: 3757322 (1973-09-01), Barkan et al.
patent: 3774196 (1973-11-01), Fleming
patent: 3783445 (1974-01-01), Penwarden
patent: 3833832 (1974-09-01), Fein et al.

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