Title:
ELASTIC WAVE DEVICE
Document Type and Number:
WIPO Patent Application WO/2022/270405
Kind Code:
A1
Abstract:
Provided is an elastic wave device in which a higher mode does not readily occur. Provided is an elastic wave device 1 in which: a piezoelectric film 3 is layered on an energy confinement layer; an IDT electrode 4 and a first dielectric film 7 are layered on a first main surface 3a of the piezoelectric film 3; a second IDT electrode 5 and a second dielectric film 8 are layered on a second main surface 3b; and, if the product of the density and the film thickness of the second dielectric film 8 on the second main surface 3b side is greater than that of the first dielectric film 7 on the first main surface 3a side, the sum total of the products of the densities and film thicknesses of electrode fingers of the first IDT electrode 4, which are covered by the first dielectric film 7, is less than the sum total of the products of the densities and film thicknesses of electrode fingers of the second IDT electrode 5.
Inventors:
NAGATOMO SHO (JP)
Application Number:
PCT/JP2022/024129
Publication Date:
December 29, 2022
Filing Date:
June 16, 2022
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H03H9/25; H03H9/145
Domestic Patent References:
| WO2007007462A1 | 2007-01-18 | |||
| WO2017187768A1 | 2017-11-02 |
Foreign References:
| JP2013143608A | 2013-07-22 | |||
| JP2007312164A | 2007-11-29 | |||
| JP2018506930A | 2018-03-08 |
Attorney, Agent or Firm:
OSAKA FRONT (JP)
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