Acoustic touch apparatus

摘要

An improved acoustic touch apparatus that has a logo or application icon applied on the back surface of a propagating substrate which can be viewed through the substrate and an acoustic element situated adjacent the logo or application icon that can compensate for phase velocity shifts of surface acoustic waves in propagating over the logo or application icon.

主权项

1. An acoustic touch apparatus, comprising:
a substrate having surfaces configured to propagate surface acoustic waves; at least one acoustic wave transducer on a first surface; and at least one reflective array on the first surface, said transducer configured to at least transmit or receive surface acoustic waves to or from the reflective array and said reflective array configured to acoustically couple surface acoustic waves to propagate between surfaces of the substrate, and said substrate having a first acoustic element disposed on the first surface that is configured to intercept propagating surface acoustic waves on the first surface and is configured to cause variations in the phase velocity of the propagating surface acoustic waves and a second acoustic element disposed on the first surface to equalize the variations, wherein the second acoustic element is formed with a shape that is a compensating pattern of the first acoustic element.