Patent ID: 9083303
Filing Date: 2015-07-14
Classification: H03H

Abstract:
1. An acoustic wave device comprising: a substrate; a dielectric film formed on the substrate; and a pair of IDT electrodes opposing each other provided between the substrate and the dielectric film, wherein at least one of the substrate and the dielectric film is piezoelectric, wherein the IDT electrodes each include an electrode finger that extends in at least one direction, wherein the dielectric film has a sloped area in a gap portion that is an area between a tip of the electrode finger of one of the IDT electrodes and the other IDT electrode that is opposing to said one of the IDT electrodes in the direction of extension of the electrode finger, so that a film thickness of the dielectric film changes in said gap, and wherein a film thickness difference caused by the change in the film thickness of the dielectric film in said sloped area is greater than a thickness of the IDT electrodes.