Acoustic touch sensor
First Claim
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1. A touch sensor comprising:
- a substrate capable of propagating acoustic waves, the substrate including a first surface, a first sidewall, and a second surface opposite said first surface;
said first surface having a touch sensitive region, said first sidewall intersecting the first surface along a first edge and intersecting the second surface along a second edge, the first edge being configured to propagate a first edge acoustic wave along the first edge and not along the second edge, the first surface being configured to propagate a second acoustic wave across the touch sensitive region, the second acoustic wave being based on the first edge acoustic wave and being a Rayleigh wave; and
a wave converter for converting the first edge acoustic wave to the second acoustic wave.
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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.
140 Citations
18 Claims
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1. A touch sensor comprising:
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a substrate capable of propagating acoustic waves, the substrate including a first surface, a first sidewall, and a second surface opposite said first surface;
said first surface having a touch sensitive region, said first sidewall intersecting the first surface along a first edge and intersecting the second surface along a second edge, the first edge being configured to propagate a first edge acoustic wave along the first edge and not along the second edge, the first surface being configured to propagate a second acoustic wave across the touch sensitive region, the second acoustic wave being based on the first edge acoustic wave and being a Rayleigh wave; anda wave converter for converting the first edge acoustic wave to the second acoustic wave. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification