Acoustic Touch Signal Dispersion Mitigation
First Claim
1. A touch input system comprising:
- a substrate configured to support propagation of acoustic signals;
a transducer in communication with the substrate and configured to transmit or receive the acoustic signals before or after the propagation; and
an array of reflectors disposed on the substrate, each reflector being oriented on an angle to redirect the acoustic signals along a path toward or away from the transducer;
wherein the transducer comprises a stepped interface for the redirected acoustic signals, the stepped interface comprising a set of interface elements distributed across a width of the acoustic signals and offset from one another along the path to compensate for the angle of the reflectors.
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Accused Products
Abstract
A touch input system includes a substrate configured to support propagation of acoustic signals, a transducer in communication with the substrate and configured to transmit or receive the acoustic signals before or after the propagation, and an array of reflectors disposed on the substrate. Each reflector is oriented on an angle to redirect the acoustic signals along a path toward or away from the transducer. The transducer includes a stepped interface for the redirected acoustic signals. The stepped interface includes a set of interface elements distributed across a width of the acoustic signals and offset from one another along the path to compensate for the angle of the reflectors.
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Citations
20 Claims
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1. A touch input system comprising:
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a substrate configured to support propagation of acoustic signals; a transducer in communication with the substrate and configured to transmit or receive the acoustic signals before or after the propagation; and an array of reflectors disposed on the substrate, each reflector being oriented on an angle to redirect the acoustic signals along a path toward or away from the transducer; wherein the transducer comprises a stepped interface for the redirected acoustic signals, the stepped interface comprising a set of interface elements distributed across a width of the acoustic signals and offset from one another along the path to compensate for the angle of the reflectors. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A transducer for a touch input system comprising:
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a mode conversion wedge comprising a first face and a second face opposite the first face, the mode conversion wedge being configured to convert surface acoustic wave (SAW) signals to bulk pressure waves; and a piezoelectric element disposed at the second face of the mode conversion wedge opposite of the first face to transmit or receive a reflection of the bulk pressure waves off the second face; wherein the first face includes a plurality of reflector steps offset from one another to compensate for dispersion of the SAW signals. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification