Acoustic Wave Device

Abstract

An acoustic wave device 10 is an end surface reflection-type acoustic wave device and includes a substantially rectangular-parallelepiped composite substrate 15 in which a piezoelectric substrate 12 and a supporting substrate 14 are joined together, with a pair of IDT electrodes 16 and 18 provided on the substrate 12 in such a manner as to be intercalated with each other. A chipping size in a first side face 12a of the substrate 12 is 1/10 of a wavelength π of an acoustic wave or smaller, the face 12a extending orthogonally to a direction of acoustic-wave propagation. A chipping size in a second side face 12b of the substrate 12 is larger than the chipping size in the face 12a and is, for example, 1/2 of the wavelength λ or larger and 50 times the wavelength λ or smaller, the face 12b extending in the direction of acoustic-wave propagation.

Dependencies are inferred from the claim text.