Patent ID: 7218038
Filing Date: 2007-05-15
Classification: H03H

Abstract:
1. A surface acoustic wave element comprising: metal patterns that include interdigital transducers, each of the metal patterns being formed with a first alloy or multi-layer film of metals having different standard electrode potentials; and metal films each formed with a second alloy or multi-layer film containing metals having different standard electrode potentials from the standard electrode potentials of the metals forming the first alloy or multi-layer film, the metal films being formed at least on a part of regions other than the regions corresponding to the electrode fingers of the interdigital transducers of all the metal patterns that are electrically independent of one another, wherein the metal films are formed in regions other than the regions bonded with wires or bumps in the metal patterns and are separate from conductors provided in the regions bonded with the wires or bumps.