Patent ID: 8143762
Filing Date: 2012-03-27
Classification: H03H

Abstract:
1. An elastic wave device comprising: a piezoelectric body including a LiNbO a first dielectric layer including a SiO a second dielectric layer located on the first dielectric layer and having an acoustic velocity higher than that of the first dielectric layer; and an IDT electrode disposed at an interface between the piezoelectric body and the first dielectric layer, which 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 laminated; wherein φ and θ of Euler angles (φ, θ, ψ) of the LiNbO the elastic wave device uses an elastic wave the principal component of which is an SH wave; and ψ is in a range of about 5°≦ψ≦about 30°, and where a wavelength of the elastic wave is λ and a thickness of the first electrode film is h, a normalized thickness h/λ and ψ satisfy the following expression: