Acoustic touch sensor
First Claim
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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Accused Products
Abstract
A touch sensor comprises a substrate capable of propagating acoustic waves and includes a first surface having a touch sensitive region. A first sidewall intersects the first surface along a first edge. The first edge is configured to propagate a first acoustic wave along the first edge. The first acoustic wave may be a one-dimensional edge wave. A wave converter converts the first acoustic wave to a second acoustic wave, and the first surface is configured to propagate the second acoustic wave across the touch sensitive region.
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Citations
16 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification