Acoustic touch apparatus with addressable multi-touch capability

摘要

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.

主权项

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.