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Title:
ELASTIC WAVE DEVICE
Document Type and Number:
WIPO Patent Application WO/2022/045086
Kind Code:
A1
Abstract:
Provided is an elastic wave device which suppresses a deterioration in resonance characteristics. This elastic wave device comprises a piezoelectric layer, a pair of electrodes, and a protective film. When the upper surface of the protective film which covers a first surface of the electrodes is viewed in a Z-direction, and when L is the distance from an end section of the upper surface of the protective film in an X-direction to an end section of the first surface of each of the electrodes, and H is the thickness from the first surface of each of the electrodes to the upper surface of the protective film, the elastic wave device satisfies the following expression (1).　(1): 0.3≤L/H<1.0

Inventors:
OUCHI MINEFUMI (JP)
Application Number:
PCT/JP2021/030875
Publication Date:
March 03, 2022
Filing Date:
August 23, 2021
Export Citation:
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Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H03H9/145; H03H9/25
Domestic Patent References:
WO2020158673A12020-08-06
WO2010131450A12010-11-18
WO2020095586A12020-05-14
Foreign References:
JP2010233210A2010-10-14
JP2013528996A2013-07-11
US20190386635A12019-12-19
JP2009118369A2009-05-28
JP2001168671A2001-06-22
JP2018050135A2018-03-29
JP2006109287A2006-04-20
Attorney, Agent or Firm:
SAKAI INTERNATIONAL PATENT OFFICE (JP)
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