Title:
PIEZOELECTRIC FILM
Document Type and Number:
WIPO Patent Application WO/2020/261822
Kind Code:
A1
Abstract:
The present invention addresses the problem of providing a piezoelectric film (10) capable of realizing an electroacoustic transduction film or the like which exhibits high heat radiation performance and provides sufficient sound pressure in response to an input operation voltage. The problem is solved since this piezoelectric film has: a polymeric composite piezoelectric body (12) that includes piezoelectric particles (26) in a matrix (24) including a polymeric material; electrode layers (14, 16) laminated on both surfaces of the polymeric composite piezoelectric body; and protective layers (18, 20) laminated on the surface of at least one electrode layer. When a cross-section of the piezoelectric film is observed by a scanning electrode microscope, at least one of the electrode layers include a plurality of projection parts (30) directed toward the corresponding projective layer, and the number of projection parts is 2-40 per visual field of 85 µm in the cross-section.
Inventors:
IWAMOTO TAKAHIRO (JP)
Application Number:
PCT/JP2020/019872
Publication Date:
December 30, 2020
Filing Date:
May 20, 2020
Export Citation:
Assignee:
FUJIFILM CORP (JP)
International Classes:
H01L41/18; H01L41/047; H01L41/053; H01L41/33; H04R17/00
Domestic Patent References:
| WO2014162976A1 | 2014-10-09 |
Foreign References:
| JP2013171981A | 2013-09-02 | |||
| JP2001085757A | 2001-03-30 | |||
| JP2014212307A | 2014-11-13 |
Other References:
See also references of EP 3993073A4
Attorney, Agent or Firm:
ITOH Hideaki et al. (JP)
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