Telegraphy – Systems – Position coordinate determination for writing
Patent
1988-01-25
1989-02-21
Schreyer, Stafford D.
Telegraphy
Systems
Position coordinate determination for writing
178 19, G08C 2100
Patent
active
048067083
ABSTRACT:
A coordinate determining tablet and method for determining an X-Y coordinate position using electromagnetic induction, including a plurality of conductive wires mounted on an insulating plate such that the wires are formed in a parallel return winding pattern displaced from each other by an interval; one end of the conductive wires forming the return are connected to a common conductive wire, while the other end of the conductive wires are each connected to one terminal of a switch provided for each parallel winding; the other terminals of the switches are connected alternately to three common conductive wires; the switches are arranged in a number of groups so as to simultaneously turn on and off groups of parallel winding patterns at a predetermined interval. The coordinate determining method includes inducing a current in a cursor, sequentially turning on and off the switches in the groups, adding together the signals induced in the conductive wires, discriminating and comparing the signals, and determining an absolute position of the cursor on the coordinate plane.
REFERENCES:
patent: 4717793 (1988-01-01), Kobayashi
Graphtec Kabushiki Kaisha
Iandiorio Joseph S.
Schreyer Stafford D.
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