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Focusing-shaped reflector arrays for acoustic touchscreens

  • US 7,274,358 B2
  • Filed: 01/06/2004
  • Issued: 09/25/2007
  • Est. Priority Date: 01/06/2004
  • Status: Active Grant
First Claim
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1. A touchscreen, comprising:

  • A substrate capable of propagating acoustic waves, the substrate having a touch-sensitive area; and

    an array of acoustically reflective elements lying in or on the substrate, the array having an axis, the reflective array elements positioned at an angle relative to the array axis to transmit or receive acoustic signals into or out of the touch-sensitive area, the reflective array elements having a focusing shape that serves to focus acoustic wave energy passing through the elements to an area proximate a center line of the array axis, at least one reflective array element having at least one of (a) a varying width dimension with a maximum width proximate its center and (b) a varying height dimension with a maximum height proximate its center.

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