Elastic wave devices

摘要

An elastic wave device that can be downsized. Certain examples of the elastic wave device include a substrate, an IDT electrode provided above the substrate, a wiring electrode provided above the substrate and connected to the IDT electrode, a sealing body sealing an excitation space in which the IDT electrode excites an elastic wave, and a sealing wall provided above the wiring electrode and forming a part of the sealing body. An outer periphery of the wiring electrode includes a protrusion. In one example, the wiring electrode includes a first wiring electrode provided on an upper surface of the substrate and a second wiring electrode provided on an upper surface of the first wiring electrode, an outer periphery of the second wiring electrode being provided with the protrusion.

主权项

1. An elastic wave device comprising:
a piezoelectric substrate; an interdigital transducer (IDT) electrode disposed on the piezoelectric substrate; a dielectric sealing body sealing an excitation space in which the IDT electrode excites an elastic wave; a wiring electrode connected to the IDT electrode, the wiring electrode including a first wiring electrode disposed directly on and contacting an upper surface of the piezoelectric substrate, and a second wiring electrode disposed directly on and contacting an upper of the first wiring electrode, the second wiring electrode including a protrusion formed on an outer periphery of the second wiring electrode and configured to protrude beyond an outer periphery of the first wiring electrode into the excitation space; and a sealing wall extending vertically between the dielectric sealing body and the second wiring electrode and being continuous with and forming a part of the dielectric sealing body, the sealing wall being spaced apart from the IDT electrode by the protrusion and having a side surface defining a side edge of the excitation space.