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Radial layout for acoustic wave touch sensor

  • US 9,348,467 B2
  • Filed: 11/15/2011
  • Issued: 05/24/2016
  • Est. Priority Date: 11/15/2011
  • Status: Active Grant
First Claim
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1. A touch sensor for detecting a touch, the touch sensor comprising:

  • a touch substrate having a top surface and a bottom surface, the top surface having a touch region;

    a first transducer configured to;

    generate or receive first surface acoustic waves on the touch region, the first transducer comprising a first radial transducer; and

    a second transducer configured to;

    receive or generate the first surface acoustic waves;

    detect a first angle associated with the touch from attenuation of the first surface acoustic waves along a first radial line;

    determine a point location of the touch as a function of the first angle; and

    determine a radius of the touch along the first radial line, the radius determined as a function of a width of attenuation,wherein the first surface acoustic waves have a first radial pattern, generated via refraction by the first radial transducer, with an angular span of at least 20°

    in the touch region, the first radial pattern comprising a first plurality of linear beams comprising an amplitude above a predefined threshold across a width of the beams, the first radial pattern being divergent as a distance from the first transducer increases.

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