Telegraphy – Systems – Position coordinate determination for writing
Patent
1985-08-30
1987-02-10
Schreyer, Stafford D.
Telegraphy
Systems
Position coordinate determination for writing
340365A, G08C 2100
Patent
active
046424237
ABSTRACT:
Apparatus for use in a touch control system for a cathode ray tube, display panel or other touch-controlled device which is capable of recognizing touch positions along a predetermined coordinate axis on a curved touch surface comprises a substrate comprising a sector of a three dimensionally curved surface having a touch surface capable of propagating surface acoustic waves such that a touch on that surface causes a perturbation of a surface wave propagating through the region of the touch. An input surface wave transducer mechanically and acoustically coupled to the touch surface of the substrate, upon excitation launches a burst of surface acoustic waves on the touch surface along a first path which represents a great circle on that surface. The apparatus also includes an array of surface wave reflective elements which are disposed in or on the touch surface of the substrate along the aforesaid first path for directing wave components derived from the burst across the touch surface of the substrate in a progression of transverse paths which intersect the coordinate axis of that surface.
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O'Connor Cornelius J.
Schreyer Stafford D.
Zenith Electronics Corporation
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