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:
Sep. 04, 2007
Filed:
Jan. 14, 2003
Takanori Nakano, Osaka, JP;
Shogo Matsubara, Fukuoka, JP;
Shintaro Hara, Fukuoka, JP;
Kazuo Nishimura, Osaka, JP;
Masaichiro Tatekawa, Osaka, JP;
Masakazu Tanahashi, Osaka, JP;
Hiroyuki Matsuo, Osaka, JP;
Takanori Nakano, Osaka, JP;
Shogo Matsubara, Fukuoka, JP;
Shintaro Hara, Fukuoka, JP;
Kazuo Nishimura, Osaka, JP;
Masaichiro Tatekawa, Osaka, JP;
Masakazu Tanahashi, Osaka, JP;
Hiroyuki Matsuo, Osaka, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A piezoelectric actuator is constructed by forming a common electrodeof Cr, a piezoelectric layerof Pb(Zr,Ti)O, a cover layerof BaTiO, and an individual electrodeof Pt in this order into a laminate. The thickness of the piezoelectric layerin the lamination direction (T) and the thickness of the cover layerin the lamination direction (T) satisfy the relationship of 0.08≦T/T≦1. The relative dielectric constant of the piezoelectric layer(εr) and the relative dielectric constant of the cover layer(εr) satisfy the relationship of εr/εr