Patent ID: 9099634
Filing Date: 2015-08-04
Classification: H01L,H03H

Abstract:
1. An elastic-wave filter device comprising: a first piezoelectric substrate having a first interdigital transducer (IDT) electrode on a top face thereof; a second piezoelectric substrate having a second IDT electrode on a top face thereof and disposed such that a lateral face thereof confronts a lateral face of the first piezoelectric substrate, the first piezoelectric substrate being thicker than the second piezoelectric substrate, a distance between a plane including the top face of the first piezoelectric substrate and a plane including the top face of the second piezoelectric substrate being smaller than a distance between a plane including an underside of the first piezoelectric substrate and a plane including an underside of the second piezoelectric substrate; a first pillar-like wiring electrode formed above the first piezoelectric substrate and electrically connected to the first IDT electrode; a first externally connecting terminal electrically connected to the first pillar-like wiring electrode; a second pillar-like wiring electrode formed above the second piezoelectric substrate and electrically connected to the second IDT electrode; a second externally connecting terminal electrically connected to the second pillar-like wiring electrode; a dielectric sealing member covering the underside and the lateral face of the first piezoelectric substrate and the underside and the lateral face of the second piezoelectric substrate; a dielectric layer disposed between the dielectric sealing member and the first externally connecting terminal and between the dielectric sealing member and the second externally connecting terminal; and an upper-layer protective film disposed on a portion of the dielectric layer, a portion of the first externally connecting terminal, and a portion of the second externally connecting terminal.