Telegraphy – Systems – Position coordinate determination for writing
Patent
1990-11-01
1992-06-09
Schreyer, Stafford D.
Telegraphy
Systems
Position coordinate determination for writing
340706, G08C 2100
Patent
active
051209080
ABSTRACT:
Disclosed is electromagnetic transducer that does not require complex analog to digital, digital to analog converters, microprocessors or large memory circuitry. The transducer has a helical transmitter coil with tap nodes spaced between its end extremities. An oscillator drives the coil for simultaneously producing oppositely directed current on opposite sides of selected taps, creating a moving fringing field that is compatible with modern graphic display tablet technology. A control circuit of the transducer has a closed-loop integrator for detecting the centroid of a received stylus signal. Analog and digital versions of the integrator are disclosed.
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"Introduction to Graphic Digitizers" by W. Creitz and G. Helser; GTCO Corporation, Columbia, Md.; Title page, pp. 3-43; 1986.
Gilano Michael N.
Zank Anthony E.
Gazelle Graphic Systems Inc.
Schreyer Stafford D.
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