Graphical data entry apparatus

Details Graphical data entry apparatus Graphical data entry apparatus

1981-08-25

1984-03-06

Schreyer, Stafford D.

Telegraphy

Systems

Position coordinate determination for writing

G08C 2100

Patent

active

044356161

ABSTRACT:
Improvements in graphic tablets employing resistance planes are disclosed including one or more of the following: a tablet usable both by depression and by capacitive probe, reference connections to side midpoints, automatic gain control for capacitive readings, selective high voltage tablet energization for increased resolution reading of a detected region, forming high resistance edges by bending flaps so that resistance flux deposition is oblique to the flaps, separate overlying substrates with edge connecting resistances, and cursor light and/or infrared positioning beam generators.

REFERENCES:
patent: 2975235 (1961-03-01), Leitner et al.
patent: 3522664 (1970-08-01), Lambright et al.
patent: 3798370 (1974-03-01), Hurst
patent: 3959585 (1976-05-01), Mattes et al.
patent: 4079194 (1978-03-01), Kley
patent: 4178481 (1979-12-01), Kley
patent: 4184044 (1980-01-01), Zwerenz
patent: 4214122 (1980-07-01), Kley

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