Patent ID: 6898831

Claim:
A method of producing a surface acoustic wave device, comprising the steps of: forming at least one of a plurality of interdigital transducer electrodes on a mother wafer including a piezoelectric substrate, wherein the plurality of interdigital transducer electrodes are formed to have a multi-layer structure including: (a) at least one high specific gravity metal component containing layer having a film-thickness of at least about 10 nm and including as a major component a metal having a specific gravity of at least about 15; and (b) at least one low specific gravity metal component containing layer having a film-thickness of at least about 10 nm and including as a major component a metal having a specific gravity of up to about 10 and a bulk resistivity, at 20° C., of up to about 10×10 −8 Ω·m; and cutting the mother wafer at predetermined positions to divide the mother wafer into individual surface acoustic wave elements.