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:
Apr. 12, 2005
Filed:
Jul. 01, 2003
Michio Kadota, Kyoto, JP;
Hideya Horiuchi, Nagaokakyo, JP;
Takeshi Nakao, Nagaokakyo, JP;
Yasuhiro Kuratani, Kyoto, JP;
Masakazu Mimura, Nagaokakyo, JP;
Junya Ago, Tomaya-ken, JP;
Michio Kadota, Kyoto, JP;
Hideya Horiuchi, Nagaokakyo, JP;
Takeshi Nakao, Nagaokakyo, JP;
Yasuhiro Kuratani, Kyoto, JP;
Masakazu Mimura, Nagaokakyo, JP;
Junya Ago, Tomaya-ken, JP;
Murata Manufacturing Co., Ltd., Kyoto, JP;
Abstract
A surface acoustic wave device includes a Y-cut, X-propagation LiTaOsubstrate, at least one interdigital transducer provided on the LiTaOsubstrate and made of Al or a metal containing Al as a major component, and an SiOfilm provided on the surface of the LiTaOsubstrate so as to cover the interdigital transducer, wherein the thickness Hs of the SiOfilm normalized by the wavelength λ of a surface acoustic wave and the cut angle θ of the LiTaOsubstrate are set to be in any one of the ranges represented by formulae (1) to (8):in the case of 0.00<≦0.05, 30°<θ<36°  (1)in the case of 0.05<≦0.10, 29°<θ<36°  (2)in the case of 0.10<≦0.15, 28°<θ<36°  (3)in the case of 0.15<≦0.20, 27°<θ<36°  (4)in the case of 0.20<≦0.25, 26°<θ<36°  (5)in the case of 0.25<≦0.30, 25°<θ<35°  (6)in the case of 0.30<≦0.35, 23°<θ<34°  (7)in the case of 0.35<≦0.40, 21°<θ<31°  (8)