Telegraphy – Systems – Position coordinate determination for writing
Patent
1988-04-07
1989-01-03
Schreyer, Stafford D.
Telegraphy
Systems
Position coordinate determination for writing
G08C 2100
Patent
active
047958588
ABSTRACT:
A device for determining position coordinates of points on a surface, have a cursor structure, a grid structure, and a signal processor. The cursor structure has a cursor coil and a signal generator to impress a reference phase voltage to the coil. Voltages induced from the cursor coil in conductors of the grid structure are processed in the signal processor to produce a position dependent phase voltage. For the signal processor, reference phase pulses are obtained from a voltage induced in an auxiliary grid conductor provided in the grid structure.
REFERENCES:
patent: 4740660 (1988-04-01), Kimura
Graphtec Kabushiki Kaisha
Schreyer Stafford D.
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