Invention Publication
- Patent Title: PIEZOELECTRIC FILM
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Application No.: EP21751010.6Application Date: 2021-01-12
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Publication No.: EP4102857A1Publication Date: 2022-12-14
- Inventor: TAMADA, Yoshinori
- Applicant: FUJIFILM Corporation
- Applicant Address: JP Tokyo 106-8620 26-30, Nishiazabu 2-chome Minato-ku
- Agency: Klunker IP Patentanwälte PartG mbB
- Priority: JP2020019505 20200207
- International Announcement: WO2021157288 20210812
- Main IPC: H04R17/00
- IPC: H04R17/00 ; H01L41/09 ; H01L41/18 ; H01L41/257 ; H01L41/313 ; H01L41/317
Abstract:
An object of the present invention is to provide a piezoelectric film capable of realizing an electroacoustic conversion film or the like in which the durability is high and a sufficient sound pressure with respect to an input operating voltage is obtained. The object is achieved by providing a piezoelectric film including a polymer-based piezoelectric composite material which contains piezoelectric particles in a matrix containing a polymer material, and electrode layers which are provided on both surfaces of the polymer-based piezoelectric composite material, in which in a case where a cross section of the film in a thickness direction is observed with a scanning electron microscope, the polymer-based piezoelectric composite material is divided into ten equal regions in the thickness direction, area ratios of the piezoelectric particles in two most distant regions are measured, and the area ratio of the piezoelectric particles in the region with a lower area ratio is set as 1, the area ratio of the piezoelectric particles in the region with a higher area ratio is 1.2 or greater.
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