Telegraphy – Systems – Position coordinate determination for writing
Patent
1981-09-14
1984-04-10
Schreyer, Stafford D.
Telegraphy
Systems
Position coordinate determination for writing
428255, 340712, 340709, 358 83, G08C 2100
Patent
active
044423179
ABSTRACT:
A coordinate sensing device uses electric currents to energize a conducting member which has a major surface and preferably is made of mesh material. Electrical currents are sequentially applied to create alternate noncoincident electrical fields so that when a probe is applied to the surface, the obtained electrical potentials can be compared to a reference potential. The resulting potential differences may then be conveniently converted to appropriate signals. The conducting member is not limited as to shape or construction; hence, it may also act as an anti-glare device for a cathode-ray tube. The fields created by the electrical currents need not be uniform.
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Schreyer Stafford D.
Sun-Flex Company, Inc.
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