Title:
ELASTIC WAVE DEVICE AND FILTER DEVICE
Document Type and Number:
WIPO Patent Application WO/2021/060523
Kind Code:
A1
Abstract:
Provided is an elastic wave device capable of increasing Q values, even if made more compact, and capable of easily adjusting frequency. The elastic wave device 1 comprises: a piezoelectric layer 2 comprising lithium niobate or lithium tantalate and having first and second main surfaces 2a, 2b that face each other; at least one pair of electrodes 3, 4 (first and second electrodes) provided upon the first main surface 2a of the piezoelectric layer 2; and an additional membrane 10 provided on at least one electrode among the electrodes 3, 4 or upon the piezoelectric layer 2, such that a region in which the electrodes 3, 4 are formed and at least one region among regions between each electrode 3, 4 overlap in the planar view. The electrodes 3, 4 are adjacent and when the thickness of the piezoelectric layer 2 is d and the distance between the centers of the electrodes 3, 4 is p, d/p is no more than 0.5.
Inventors:
NAGATOMO SHO (JP)
KIMURA TETSUYA (JP)
YAMANE TAKASHI (JP)
DAIMON KATSUYA (JP)
KOYANAGI TAKUYA (JP)
TOYOTA YUJI (JP)
KIMURA TETSUYA (JP)
YAMANE TAKASHI (JP)
DAIMON KATSUYA (JP)
KOYANAGI TAKUYA (JP)
TOYOTA YUJI (JP)
Application Number:
PCT/JP2020/036416
Publication Date:
April 01, 2021
Filing Date:
September 25, 2020
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H03H9/145; H03H9/17; H03H9/25; H03H9/64
Domestic Patent References:
| WO2019009373A1 | 2019-01-10 | |||
| WO2018135489A1 | 2018-07-26 | |||
| WO2012102131A1 | 2012-08-02 |
Foreign References:
| JP2010233210A | 2010-10-14 | |||
| JP2013528996A | 2013-07-11 | |||
| JP2017112603A | 2017-06-22 | |||
| JP2000196409A | 2000-07-14 | |||
| JP2013115496A | 2013-06-10 | |||
| JP2018074575A | 2018-05-10 |
Attorney, Agent or Firm:
MIYAZAKI & METSUGI (JP)
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