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:
Mar. 14, 2017
Filed:
Mar. 10, 2015
Yoshikazu Akiyama, Kanagawa, JP;
Naoya Kondo, Kanagawa, JP;
Satoshi Mizukami, Kanagawa, JP;
RICOH COMPANY, LTD., Tokyo, JP;
Abstract
A method of manufacturing an electromechanical transducer includes forming a first electrode on a substrate or a base film, forming a piezoelectric film made of lead zirconate titanate on the first electrode, forming a second electrode on the piezoelectric film, and polarizing the piezoelectric film. The polarizing includes applying to the second electrode a positive polarity voltage having a positive polarity relative to a potential of the first electrode, and satisfying a first expression of −Ec−(−Ec)<0 and a second expression of |−Ec−(−Ec)|>0.15×Ec, where −Ec represents an initial coercive field of a negative polarity side of the electromechanical transducer, −Ecrepresents a coercive field of the negative polarity side after the applying, Ecrepresents a coercive field of a positive polarity side after the applying, and Ecrepresents an average of absolute values of the coercive field −Ecand the coercive field Ec.