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Acoustic touch sensor

  • US 8,854,339 B2
  • Filed: 07/15/2011
  • Issued: 10/07/2014
  • Est. Priority Date: 04/14/2004
  • Status: Active Grant
First Claim
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1. A shear-mode transducer for generating or receiving an acoustic edge wave in a touch sensor having a substrate with a first surface having a touch region and a second surface intersecting the first surface along a first edge, the acoustic edge wave propagating along the first edge, the shear-mode transducer mounted on the substrate on the second surface, the shear-mode transducer comprising:

  • a shear-mode piezoelectric element, the shear-mode piezoelectric element generating shear motion in a direction relative to a plane of the second surface defined by X and Y axes so as to couple to the acoustic edge wave, wherein the shear motion is polarized diagonally in the plane of the second surface defined by the x and y axes; and

    a first electrode and a second electrode disposed on the shear-mode piezoelectric element to provide an active region of the shear-mode piezoelectric element, said active region comprising a cross-sectional area of the acoustic edge wave.

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