Patent ID: 7126251
Filing Date: 2006-10-24
Classification: H03H

Abstract:
1. An interface acoustic wave device, comprising: a first crystal substrate (S a second crystal substrate (S said first and second crystal substrates being joined together via a plane interface region (I) serving for the propagation of acoustic waves and comprising at least one electroacoustic transducer; interconnection means for electrically connecting said transducers; the substrates, referenced in an initial orthonormal coordinate system (X,Y,Z), Z being parallel to the optical axis, X being defined by the piezoelectricity of the crystal and Y being perpendicular to (X,Z), having their identical cut plane and a common crystal orientation, said cut plane being identified by two successive angles of rotation φ and θ, φ corresponding to a first rotation about the Z axis, the coordinate system obtained thus being denoted by (X′,Y′,Z′) with Z ′ coincident with Z, and θ representing a second rotation about the X′ axis, the coordinate system obtained thus being denoted by (X″,Y″,Z″), with X″ coincident with X′, the direction of propagation of the acoustic waves being defined by a third angle ψ taken in said coordinate system (X″,Y″,Z″) representing a rotation about the Y″ axis, characterized in that, for any direction of propagation ψ: the cut angles (φ,θ) lie within one of the following two angular ranges called the (0,0,0,)