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. 20, 2010
Filed:
Aug. 14, 2008
Shunsuke Kido, Kusatsu, JP;
Takeshi Nakao, Omihachiman, JP;
Yasuharu Nakai, Takatsuki, JP;
Kenji Nishiyama, Yasu, JP;
Michio Kadota, Kyoto, JP;
Shunsuke Kido, Kusatsu, JP;
Takeshi Nakao, Omihachiman, JP;
Yasuharu Nakai, Takatsuki, JP;
Kenji Nishiyama, Yasu, JP;
Michio Kadota, Kyoto, JP;
Murata Manufacturing Co., Ltd., Kyoto, JP;
Abstract
A surface acoustic wave device includes a piezoelectric substrate, at least one interdigital transducer (IDT) electrode provided on the piezoelectric substrate, and an insulator layer to improve a temperature characteristic arranged so as to cover the IDT electrode. When a surface of the insulator layer is classified into a first surface region under which the IDT electrode is positioned and a second surface region under which no IDT electrode is positioned, the surface of the insulator layer in at least one portion of the second surface region is higher than the surface of the insulator layer from the piezoelectric substrate in at least one portion of the first surface region by at least about 0.001λ, where the wavelength of an acoustic wave is λ.