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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

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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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 spherically curved touch surface, which system includes; a substrate comprising a segment of a spherically curve

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 spherically curved touch surface, which system includes; a substrate comprising a segment of a spherically curved surface having a touch surface capable of propagating surface acoustic waves, an input surface wave transducer acoustically coupled to said touch surface of said substrate and useful when excited for launching on said touch surface a beam of surface acoustic wave energy which, if undisturbed, would travel along a path that corresponds to a great circle on said spherically curved surface, and an output surface wave transducer, also acoustically coupled to said touch surface, for developing an electrical output signal upon receipt of surface acoustic wave energy derived from said beam; an arrangement for use in said touch control system for establishing travel of said beam of surface wave energy along a desired path having a contour intermediate a great circle and a parallel comprising: an elongated arcuate array of surface wave reflective elements disposed on said touch surface of said substrate and having a curvature corresponding to said desired path for directing wave components derived from said beam across said touch surface of said substrate in a progression of transverse paths intersecting said coordinate axis, said array having means for reducing the velocity of surface acoustic wave energy configured and of sufficient density to produce a wave guiding action within said array upon said beam of acoustic wave energy along said desired path effective to confine said beam of energy to said desired path, thus permitting derivation, along the entire length of said desired path, of said wave components in said transverse paths capable of eventually exciting said output transducer to develop said output signal.