Electrographic apparatus

Details Electrographic apparatus Electrographic apparatus

1985-11-01

1987-05-12

Schreyer, Stafford D.

Telegraphy

Systems

Position coordinate determination for writing

G08C 2100

Patent

active

046652833

ABSTRACT:
An electrographic apparatus or digitizer has a resistive layer with an active area which operates in conjunction with a stylus 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 and position coordinates of the position locator are developed by the apparatus. Voids or discontinuities are formed in the resistive layer to increase the edge-to-edge resistance of the layer and to provide identical edge-to-edge resistances in the x- and the y-coordinate direction for digitizers which are rectangular and non-square.

REFERENCES:
patent: 3399401 (1968-08-01), Ellis et al.
patent: 3567859 (1971-03-01), Ellis
patent: 3914548 (1975-10-01), Barish
patent: 3974332 (1976-10-01), Abe
patent: 4143240 (1979-03-01), Kobayashi
patent: 4198539 (1980-04-01), Pepper
patent: 4293734 (1981-10-01), Pepper
patent: 4353552 (1982-10-01), Pepper
patent: 4371746 (1983-02-01), Pepper
patent: 4435616 (1984-03-01), Kley

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