Acoustic touch apparatus with addressable multi-touch capability
First Claim
Patent Images
1. An acoustic touch sensor system having multi-touch capability, comprising:
- a substrate adapted to propagate surface acoustic waves along opposite surfaces and to transfer, through the substrate, surface acoustic waves between the surfaces and to form a touch sensitivity pattern on a touch region on one of the opposite surfaces based on alternating surface acoustic waves propagating through the touch region;
a transmitter-reflector arrangement adapted to transmit surface acoustic waves on each opposite surface;
a receiver-reflector arrangement adapted to receive surface acoustic waves from each opposite surface and to produce a touch response signal in response to a touch on the touch region; and
a controller that operates on the touch response signals and determines positional information of the touch on the touch region from the touch response signals.
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Abstract
An acoustic touch apparatus (100) that utilizes the transfer of surface acoustic waves from one surface (115), through the touch substrate (105), to another surface (110) and a grid of sensitivity zones (Z) formed on one of the surfaces (115) to enable multi-touch capabilities.
44 Citations
12 Claims
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1. An acoustic touch sensor system having multi-touch capability, comprising:
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a substrate adapted to propagate surface acoustic waves along opposite surfaces and to transfer, through the substrate, surface acoustic waves between the surfaces and to form a touch sensitivity pattern on a touch region on one of the opposite surfaces based on alternating surface acoustic waves propagating through the touch region; a transmitter-reflector arrangement adapted to transmit surface acoustic waves on each opposite surface; a receiver-reflector arrangement adapted to receive surface acoustic waves from each opposite surface and to produce a touch response signal in response to a touch on the touch region; and a controller that operates on the touch response signals and determines positional information of the touch on the touch region from the touch response signals. - View Dependent Claims (2)
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3. An acoustic touch sensor system, comprising:
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a substrate having a first surface with a touch region and a second surface opposite the first surface, the substrate being adapted to propagate surface acoustic waves along each of the surfaces and to transfer, through the substrate, surface acoustic waves between the surfaces; a transmitter adapted to transmit respective surface acoustic waves on each surface that alternate propagating in the touch region as the surface acoustic waves transfer between the surfaces; a receiver adapted to receive surface acoustic waves from each surface and to produce touch response signals in response to a touch on the touch region; and a controller that operates on the touch response signals and determines positional information of a respective touch on the touch region from the touch response signals. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification