Title:
ELASTIC WAVE DEVICE
Document Type and Number:
WIPO Patent Application WO/2022/071488
Kind Code:
A1
Abstract:
An elastic wave device is provided which can increase the degrees of freedom of a design that can suppress spurious emission. This elastic wave device 10 is provided with: a piezoelectric layer 16 that has a first principal surface 16a and second principal surface 16b facing each other, and that is formed from lithium niobate or lithium tantalate; an IDT electrode 11 that is provided on the first principal surface 16a of the piezoelectric layer 16 and that has multiple electrode fingers (first and second electrode fingers 24, 25); and a mass addition film 16 that is provided on the second principal surface 16b of the piezoelectric layer 16 and that has a plurality of periodically arranged protrusions. Defining d as the thickness of the piezoelectric layer 16, and p as the distance between centers of the adjacent electrode fingers of the multiple electrode fingers, d/p is less than or equal to 0.5. In planar view, at least part of the protrusions on the mass addition film 15 overlap with at least part of the electrode fingers.
Inventors:
NAGATOMO SHO (JP)
INOUE KAZUNORI (JP)
OUCHI MINEFUMI (JP)
INOUE KAZUNORI (JP)
OUCHI MINEFUMI (JP)
Application Number:
PCT/JP2021/036135
Publication Date:
April 07, 2022
Filing Date:
September 30, 2021
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H03H9/145; H03H9/25
Domestic Patent References:
| WO2015137054A1 | 2015-09-17 | |||
| WO2008059674A1 | 2008-05-22 |
Foreign References:
| JP2010154505A | 2010-07-08 | |||
| JP2010109949A | 2010-05-13 | |||
| JP2012005106A | 2012-01-05 | |||
| US20170214381A1 | 2017-07-27 |
Attorney, Agent or Firm:
MIYAZAKI & METSUGI (JP)
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