Patent ID: 7940146

Claim:
A boundary acoustic wave element comprising: a piezoelectric substance; a dielectric substance laminated on the piezoelectric substance; an IDT electrode disposed at an interface between the piezoelectric substance and the dielectric substance; a sound-absorbing film provided on a surface of the dielectric substance opposite to the interface; a heat dissipation pattern that is arranged on an outer side surface of the dielectric substance or the sound-absorbing film and includes a portion that completely overlaps an entire area of the IDT electrode when seen in a plan view; a bump provided on an outer side surface of the sound-absorbing film; and a via-hole conductor that extends through the sound-absorbing film, and is electrically connected to the IDT electrode and the bump; wherein the bump and the heat dissipation pattern are connected to each other by the via-hole conductor; and the boundary acoustic wave element using a boundary acoustic wave that propagates along a boundary between the piezoelectric substance and the dielectric substance.