The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 04, 2024
Filed:
Sep. 11, 2023
Kureha Corporation, Tokyo, JP;
Yusuke Sato, Tokyo, JP;
Hisaaki Terashima, Tokyo, JP;
Nobufumi Sato, Tokyo, JP;
Kazuyuki Kanno, Tokyo, JP;
Keiko Aita, Tokyo, JP;
KUREHA CORPORATION, Tokyo, JP;
Abstract
To provide a piezoelectric body film that can suppress decrease in the piezoelectric constant d, a method of producing a piezoelectric body film, and a piezoelectric body device. A piezoelectric body film comprising a fluororesin as a piezoelectric material, the fluororesin containing, as a main constituent unit, a repeating unit derived from vinylidene fluoride, a piezoelectric constant dof the piezoelectric body film being 20 pC/N or greater, and an extrapolated onset temperature at start of shrinkage determined by TMA measurement being not lower than 90° C. and not higher than 115° C. The difference between piezoelectric constants dmeasured before and after heating the piezoelectric body film at 100° C. for 24 hours relative to the piezoelectric constant dbefore the heating for 24 hours is 20% or less.