Tablet system with digital activation

Details Tablet system with digital activation Tablet system with digital activation

1975-06-02

1976-11-16

Robinson, Thomas A.

Telegraphy

Systems

Position coordinate determination for writing

G08C 2100

Patent

active

039925790

ABSTRACT:
An improved tablet system is disclosed of the type having an array of X and Y dimension wires that are capacitively coupled to a pen that a user holds to the tablet to produce a position signal. Drivers are provided for individual wires to produce a selected activation pattern for the wires. The drivers are operated from a shift register and associated components that are mounted on the tablet and are connected to an associated processor through only a small number of conductors.

REFERENCES:
patent: 3342935 (1967-09-01), Leifer et al.
patent: 3828128 (1974-08-01), Dethloff et al.
Ivashchenko, et al., "Inductive Transducers....," Soviet Journal of Instrumentation and Control, No. 8, Aug. 1969, pp. 22-25.

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