Title:
PIEZOELECTRIC FILM, LAYERED PIEZOELECTRIC ELEMENT, AND ELECTROACOUSTIC TRANSDUCER
Document Type and Number:
WIPO Patent Application WO/2020/196850
Kind Code:
A1
Abstract:
The present invention addresses the problem of providing: a piezoelectric film that has outstanding flexibility in high-temperature environments exceeding 50°C and demonstrates good flexibility even at normal temperatures; a layered piezoelectric element in which this piezoelectric film is layered; and an electroacoustic transducer in which this piezoelectric film or layered piezoelectric element is used. This problem is solved by a piezoelectric film: which includes a piezoelectric polymer composite formed by dispersing piezoelectric particles in a matrix containing a polymer material, and electrode layers disposed on both sides of the piezoelectric polymer composite; and in which the loss tangent at a frequency of 1 Hz measured by dynamic viscoelasticity has a maximum value of at least 0.1 in the temperature range from over 50°C to 150°C and is at least 0.08 at 50°.
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Inventors:
MIYOSHI TETSU (JP)
Application Number:
PCT/JP2020/014097
Publication Date:
October 01, 2020
Filing Date:
March 27, 2020
Export Citation:
Assignee:
FUJIFILM CORP (JP)
International Classes:
H04R17/00; H01L41/083; H01L41/09; H01L41/18; H01L41/257
Domestic Patent References:
| WO2014157684A1 | 2014-10-02 | |||
| WO2014162976A1 | 2014-10-09 | |||
| WO2017002573A1 | 2017-01-05 |
Attorney, Agent or Firm:
ITOH Hideaki et al. (JP)
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