Telegraphy – Systems – Position coordinate determination for writing
Patent
1990-10-31
1992-05-26
Schreyer, Stafford D.
Telegraphy
Systems
Position coordinate determination for writing
340706, G08C 2100
Patent
active
051170710
ABSTRACT:
An improved finger touch and stylus detection system for use on the surface of a display device is disclosed. An overlay having horizontal and vertical transparent conductors is coupled to the other elements of the system through a bus having a minimum number of bus wires. A control processor issues command signals which selectively couples the transparent conductors to a capacitive measuring device and a radiative measuring device to determine finger and stylus position respectively. The improvements to the system include a radiative stylus having a spherical antenna which receives the overlay signal independent of the angle at which it is held. Further, a contact detecting mode has been added to eliminate spurious stylus positions measured between strokes, when the stylus is proximate to but not in contact with the overlay.
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IBM TDB Article entitled "Dual-Level Pen for Capacitive Sensing of Tablet Signals", vol. 17, No. 2, Jul. 1974, pp. 572-574.
Donaldson Robert
Gray Michael
Greanias Evon C.
Stein Frank L.
International Business Machines - Corporation
LeBaw Jeffrey S.
Schreyer Stafford D.
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