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:
Jan. 22, 2013
Filed:
Jan. 08, 2008
Nobuhiro Moriyama, Tokyo, JP;
Ken'ichi Nakamura, Fukushima-Ken, JP;
Kazuyuki Suzuki, Fukushima-Ken, JP;
Keitarou Suzuki, Fukushima-Ken, JP;
Nobuhiro Moriyama, Tokyo, JP;
Ken'ichi Nakamura, Fukushima-Ken, JP;
Kazuyuki Suzuki, Fukushima-Ken, JP;
Keitarou Suzuki, Fukushima-Ken, JP;
Kureha Corporation, Tokyo, JP;
Abstract
A method for producing a polymer piezoelectric film, comprising: a process of moving and stretching a crystalline polar polymer sheet in contact with a conductive stretching roller having a diameter of at least 30 mm and a surface friction coefficient which has been reduced to such a level as to allow a relative displacement of the crystalline polar polymer sheet in contact with the conductive stretching roller: and a step in the process of applying a polarization voltage between an electrode disposed opposite to the crystalline polar polymer sheet and the conductive stretching roller to polarize the crystalline polar polymer sheet. As a result, it is possible to stably produce a polymer piezoelectric film exhibiting stable piezoelectricity over a large area. Especially, it is possible to obtain polymer piezoelectric film exhibiting a temperature-dispersion peak temperature of dpiezoelectricity coefficient at least 120° C. and surface scratches extending in one direction.