Coarse position digitizer

Details Coarse position digitizer Coarse position digitizer

1979-02-22

1981-01-06

Robinson, Thomas A.

Telegraphy

Systems

Position coordinate determination for writing

G08C 2100

Patent

active

042438438

ABSTRACT:
A method and apparatus for determining graphical coordinates includes a grid of parallel spaced conductors, a switch in series with each conductor, a cursor having an alternating magnetic field for inducing an electric current in conductors over which it is passed and means for selectively closing the conductor switches to enable induced current flow in only one conductor at a time. The change of phase of current between conductors on either side of the cursor resulting from a circular magnetic field is detected for registering a count in a counter indicative of a coarse cursor distance from an origin axis. A count equal to a fine measurement of the distance of the cursor from a proximate conductor is added to the coarse distance count to derive a graphic coordinate.

REFERENCES:
patent: 3904822 (1975-09-01), Kamm et al.
patent: 4054746 (1977-10-01), Kamm
patent: 4088842 (1978-05-01), Ikedo

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