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Cathode ray tube for use in a touch panel display system

  • US 4,746,914 A
  • Filed: 06/06/1985
  • Issued: 05/24/1988
  • Est. Priority Date: 02/05/1985
  • Status: Expired due to Term
First Claim
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1. A cathode ray tube for use in a touch panel display system capable of recognizing touch positions along a predetermined coordinate axis on a touch surface of said system, said tube comprising:

  • a transparent glass faceplate having a touch surface capable of propagating surface acoustic waves and being so characterized that a touch on said surface causes a perturbation, in the form of at least a partial absorption of energy, of a surface wave propagating through the region of the touch;

    input surface wave transducer means mechanically and acoustically coupled to said touch surface of said faceplate and useful when excited for launching a burst of surface waves on said surface;

    at least one array of wave-reflective elements in or on said touch surface of said faceplate for directing surface wave components, derived from said burst of surface waves launched by said input transducer means, across said touch surface of said faceplate; and

    output surface wave transducer means also mechanically and acoustically coupled to said touch surface for receiving said surface wave components.

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