Arrangement for use with a touch control system having a spheric

Details Arrangement for use with a touch control system having a spheric Arrangement for use with a touch control system having a spheric

1986-11-14

1989-04-25

Caldwell, Sr., John W.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340712, 178 18, 310313A, 333153, G09G 116

Patent

active

048252123

ABSTRACT:
A touch control system for a cathode ray tube, or other touch-controlled device capable of recognizing touch positions along a predetermined coordinate axis on a three-dimensionally curved touch surface, includes a substrate comprising a segment of a three-dimensionally curved surface having a touch surface capable of propagating surface acoustic waves. An input surface wave transducer serves to launch a collimated beam of surface acoustic wave energy on the touch surface. If undisturbed, the beam would travel along a path that corresponds to a great circle on the curved surface. An output surface wave transducer develops an electrical output signal upon receipt of surface acoustic wave energy derived from the beam. A reflective array is provided which establishes travel of the beam of energy along a desired path on the touch surface having a contour intermediate a great circle and a parallel. The array has the property of reducing the velocity of surface acoustic wave energy configured and of sufficient density to produce within the array a wave guiding action upon the beam of acoustic wave energy along the desired path effective to confine the beam of energy to the desired path having the intermediate contour.

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