Telegraphy – Systems – Position coordinate determination for writing
Patent
1985-10-15
1987-02-24
Schreyer, Stafford D.
Telegraphy
Systems
Position coordinate determination for writing
367907, G08C 2100, G06K 1106
Patent
active
046458700
ABSTRACT:
Apparatus for use in a touch control system capable of recognizing touch positions along a predetermined coordinate axis on a touch surface comprises a substrate having such a surface that is capable of propagating surface acoustic waves and is so characterized that a touch thereon causes a perturbation of a surface wave propagating through the region of the touch. An input transducer coupled to that surface launches a multiplicity of different frequency SAW's along a first path on the surface. A dispersive array of SAW reflective elements formed along a first path on the substrate surface derives a plurality of different frequency wave components from the launched SAW. Each derived component is reflected from a different location along the array. The components are directed across the touch surface in a progression of paths transverse to and intersecting the coordinate axis so that each path corresponds to a component of a predetermined different frequency CODE 13TS.
REFERENCES:
patent: 3653031 (1972-03-01), Hlady et al.
patent: 3916099 (1975-10-01), Hlady
patent: 4403165 (1983-09-01), Ballato et al.
patent: 4488000 (1984-12-01), Glenn
O'Connor Cornelius J.
Schreyer Stafford D.
Zenith Electronics Corporation
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