Surface acoustic wave element, and surface acoustic wave device including the same
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United States of America Patent
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May 15, 2007
Grant Date -
Dec 16, 2004
app pub date -
May 25, 2004
filing date -
May 26, 2003
priority date (Note) -
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Abstract
A surface acoustic wave element includes: 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 the 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.
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