Title:
PIEZOELECTRIC ELEMENT, AND ELECTRO-ACOUSTIC CONVERTER
Document Type and Number:
WIPO Patent Application WO/2023/053750
Kind Code:
A1
Abstract:
Provided are a piezoelectric element and an electro-acoustic converter which are capable of suppressing sound pressure variability while suppressing heat generation, the piezoelectric element being formed by stacking a piezoelectric film. The piezoelectric element is formed by stacking a plurality of layers of the piezoelectric film, which comprises a piezoelectric layer, electrode layers provided on both surfaces of the piezoelectric layer, and protective layers provided on the electrode layers, by folding back the piezoelectric film one or more times, wherein: in a plan view, the piezoelectric element includes a projecting portion which projects from a stacked portion in which two or more layers of the piezoelectric film overlap one another; the projecting portion has a connecting portion for connecting the electrode layer and an external power source; a ratio of the surface area of the projecting portion to the surface area of the stacked portion lies within a range of 0.02 to 0.3; and a length of an edge where the projecting portion and the stacked portion are in contact with one another is equal to or greater than 4 mm.
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Inventors:
OZAWA EIKI (JP)
Application Number:
PCT/JP2022/030855
Publication Date:
April 06, 2023
Filing Date:
August 15, 2022
Export Citation:
Assignee:
FUJIFILM CORP (JP)
International Classes:
H04R17/00; B06B1/06; H04R17/02
Domestic Patent References:
| WO2020095812A1 | 2020-05-14 | |||
| WO2014157006A1 | 2014-10-02 | |||
| WO2021225071A1 | 2021-11-11 |
Foreign References:
| JP2015070110A | 2015-04-13 | |||
| JPS6054486A | 1985-03-28 |
Attorney, Agent or Firm:
ITOH Hideaki et al. (JP)
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