The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 17, 2009
Filed:
Sep. 27, 2005
Haruhiko Fujimoto, Fukushima-ken, JP;
Takeshi Ikeda, Fukushima-ken, JP;
Toshihiro Meguro, Fukushima-ken, JP;
Satoshi Waga, Fukushima-ken, JP;
Kyosuke Ozaki, Fukushima-ken, JP;
Haruhiko Fujimoto, Fukushima-ken, JP;
Takeshi Ikeda, Fukushima-ken, JP;
Toshihiro Meguro, Fukushima-ken, JP;
Satoshi Waga, Fukushima-ken, JP;
Kyosuke Ozaki, Fukushima-ken, JP;
Alps Electric Co., Ltd., Tokyo, JP;
Abstract
A surface acoustic wave element having power resistance is provided. In the surface acoustic wave element, upper dispersion preventing layers and side dispersion preventing layers each made of metal nitride are provided between interdigital transducer electrode portions and an insulating layer. Further, lower dispersion preventing layers made of metal nitride are provided between the interdigital transducer electrode portions and a piezoelectric substrate. If dispersion preventing layers made of 'metal nitride' are provided between the interdigital transducer electrode portions and the insulating layer, even though the insulating layer is formed, it is possible to prevent voids from being generated in the interdigital transducer electrode portions, unlike a related art. Therefore, the power resistance can be improved.