Telegraphy – Systems – Position coordinate determination for writing
Patent
1991-11-26
1992-09-22
Schreyer, Stafford D.
Telegraphy
Systems
Position coordinate determination for writing
340706, G08C 2100
Patent
active
051499193
ABSTRACT:
An improved stylus detection system for use on the surface of a display device. An overlay having horizontal and vertical transparent conductors is coupled to other elements of the systems through a bus having a minimal number of bus wires. A control processor issues command signal which selectively couple transparent conductors to a radiative measuring device to determine stylus position accurately. The system includes a radiative pickup stylus having a spherical antenna which receive the overlay signal independent of the angle at which it is held. Further, a contact detecting mode has been added to eliminate spurious contact position measured between strokes, when the stylus is proximate to but not in contact with the overlay.
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Donaldson Robert
Gray Michael
Greanias Evon C.
Stein Frank L.
International Business Machines - Corporation
LaBaw Jeffrey S.
Schreyer Stafford D.
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