Title:
PIEZOELECTRIC TRANSDUCER AND PIEZOELECTRIC MODULE
Document Type and Number:
WIPO Patent Application WO/2019/058978
Kind Code:
A1
Abstract:
The present invention improves the characteristics of a first piezoelectric region and a second piezoelectric region, said characteristics converting alternating voltage into vibration or converting vibration into alternating voltage. This piezoelectric transducer is provided with: a frame-like supporting part (2) which is internally provided with a cavity (23); and a piezoelectric part (3) which is supported by the supporting part (2). A first piezoelectric layer (40) of the piezoelectric part (3) is in a position that is different from the position of a second piezoelectric layer (50) of the piezoelectric part (3) in the thickness direction of the piezoelectric part (3). A first piezoelectric region (R4) is a region where a first electrode (41), a second electrode (42) and the first piezoelectric layer (40) overlap the cavity (23) in the thickness direction. A second piezoelectric region (R5) is a region where a third electrode (51), a fourth electrode (52) and the second piezoelectric layer (50) overlap the cavity (23) in the thickness direction. The second piezoelectric region (R5) is positioned in a region that surrounds the first piezoelectric region (R4) when viewed from the thickness direction.
Inventors:
MIHARA KENSUKE
OKAMOTO SHOJI
OKAMOTO SHOJI
Application Number:
PCT/JP2018/032951
Publication Date:
March 28, 2019
Filing Date:
September 06, 2018
Export Citation:
Assignee:
PANASONIC IP MAN CO LTD (JP)
International Classes:
H01L41/09; H01L41/047; H01L41/113; H01L41/187; H01L41/193; H02N2/04; H02N2/18; H04R17/00
Domestic Patent References:
| WO2016175013A1 | 2016-11-03 |
Foreign References:
| JP2014195495A | 2014-10-16 | |||
| JPH027584A | 1990-01-11 | |||
| JP2013062571A | 2013-04-04 |
Attorney, Agent or Firm:
KAMATA Kenji et al. (JP)
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