Current-ratio digitizers

Details Current-ratio digitizers Current-ratio digitizers

1984-04-16

1986-03-18

Schreyer, Stafford D.

Telegraphy

Systems

Position coordinate determination for writing

G08C 2100

Patent

active

045770581

ABSTRACT:
A digitizer table is provided under the surface of which are located a set of parallel X-conductors and a set of parallel Y-conductors arranged as a grid. They may be energized by electric currents to produce patterns of magnetic field close to the surface of the table. Means enables currents of constant polarity but of varying amplitude to be applied to successive pairs of conductors. A pen or cursor having sensor means therein responds to the local component of magnetic field perpendicular to the surface of the table. The location of the sensor between a pair of current carrying conductors is given by the ratio of the amplitudes of the currents applied to the two conductors of the pair when the resultant magnetic field component perpendicular to the surface of the table passes through a null value.

REFERENCES:
patent: 3461454 (1969-08-01), Steckenrider

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