Automatic coordinate determining device

Details Automatic coordinate determining device Automatic coordinate determining device

1976-05-21

1978-05-09

Robinson, Thomas A.

Telegraphy

Systems

Position coordinate determination for writing

H04N 100, G08C 2100

Patent

active

040888428

ABSTRACT:
A device for detecting position coordinates of patterns such as graphs and characters which are plotted on a drawing media. The device includes a tablet on which a plurality of conductive lines are installed parallel to each other, and a probe positionable for selecting a position coordinate. The probe comprises circular coils which are in a mutual inductive relation with the conductive lines. The device determines the coordinate of the probe relative to the tablet by selecting and filtering a mixed signal which is produced when scanning signals are applied to the conductive lines to induce signals in the probe coils. A wireless probe and a plurality of probes can be used on one tablet.

REFERENCES:
patent: 3647963 (1972-03-01), Bailey
patent: 3819857 (1974-06-01), Inokuchi
patent: 3904822 (1975-09-01), Kamm et al.
"Inductive Transducers for Graphical Input Devices," Ivaschenko et al., "Soviet Journal of Inst'n. & Control," for Aug. 1969, pp. 22-25.

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