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:
Feb. 05, 2019
Filed:
Apr. 25, 2016
Seiko Epson Corporation, Tokyo, JP;
Kazuya Kitada, Suwa, JP;
Masayuki Omoto, Chino, JP;
Seiko Epson Corporation, , JP;
Abstract
There is provided a piezoelectric element which includes a first electrode which is formed on a substrate, a piezoelectric layer which is formed on the first electrode, and is formed from a compound oxide having an ABOtype perovskite structure in which potassium (K), sodium (Na), niobium (Nb), and manganese (Mn) are provided, and a second electrode which is formed on the piezoelectric layer. The manganese includes bivalent manganese (Mn), trivalent manganese (Mn), and tetravalent manganese (Mn). A molar ratio (Mn/Mn+Mn) of the bivalent manganese to a sum of the trivalent manganese and the tetravalent manganese is equal to or greater than 0.31.