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Radial transducer for acoustic wave touch sensor

  • US 9,304,629 B2
  • Filed: 11/15/2011
  • Issued: 04/05/2016
  • Est. Priority Date: 11/15/2011
  • Status: Active Grant
First Claim
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1. A transducer for an acoustic wave touch sensor having a touch substrate, the transducer comprising:

  • a piezoelectric element; and

    a radial coupling element connected on a first surface with the piezoelectric element, the radial coupling element having a reflection surface and a boundary surface, the boundary surface on the touch substrate, and the reflection surface positioned relative to the piezoelectric element such that the boundary surface is capable of converting, via refraction, between first acoustic waves reflecting off of the reflection surface and second acoustic waves propagating in a radial pattern on the touch substrate, the first acoustic waves being transmitted at a velocity less than the phase velocity of the second acoustic waves propagating on the touch substrate, the radial pattern diverging as a distance from the radial coupling element increases.

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