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. 27, 2012
Filed:
Sep. 29, 2011
Norihiko Nakahashi, Nagaokakyo, JP;
Norihiko Nakahashi, Nagaokakyo, JP;
Murata Manufacturing Co., Ltd., Kyoto, JP;
Abstract
An elastic wave device that achieves an improved frequency-temperature characteristic and a sufficiently reduced spurious component includes a piezoelectric body including a LiNbOsubstrate, a first dielectric layer including a SiOlayer, a second dielectric layer, and IDT electrodes disposed at an interface between the piezoelectric body and the first dielectric layer. Each of the IDT electrodes includes a multilayer structure in which a first electrode film including at least one layer including Pt or a Pt-based alloy and a second electrode film including Al or an Al-based alloy are provided. φ and θ of Euler angles (φ, θ, ψ) of the LiNbOsubstrate are in the range of φ=0±about 2° and the range of about 80°≦θ≦about 130°, respectively. ψ is in the range of about 5°≦ψ≦about 30°. The normalized thickness h/λ and ψ satisfy the following expression: h/λ×100≦about 0.0019×ψ2+about 0.0115×ψ+3.0.