Patent ID: 7324096
Filing Date: 2008-01-29
Classification: G06F

Abstract:
1. A touch panel device comprising: a non-piezoelectric substrate; a plurality of excitation elements, each including an IDT and a piezoelectric film, disposed on said non-piezoelectric substrate, for exciting, respectively, surface acoustic waves, each surface acoustic wave having a unique center frequency; and a plurality of receiving elements, each including an IDT and a piezoelectric film, disposed on said non-piezoelectric substrate to face said excitation elements respectively, for receiving, respectively, surface acoustic waves, each surface acoustic wave having a unique center frequency, said touch panel device being characterized by propagating surface acoustic waves across said non-piezoelectric substrate, between the facing excitation elements and receiving elements, and detecting a position of an object in contact with said non-piezoelectric substrate, based on received results in said receiving elements, wherein the center frequencies of the IDTs of the excitation element and receiving element facing each other are substantially equal, and the center frequencies of the IDTs of the excitation elements and the receiving elements next to each other are different.