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. 24, 2009
Filed:
Mar. 15, 2007
Kumiko Iezumi, Tokyo, JP;
Junichi Yamazaki, Tokyo, JP;
Norimasa Sakamoto, Tokyo, JP;
Takeo Tsukada, Tokyo, JP;
Masahito Furukawa, Tokyo, JP;
Keisuke Itakura, Tokyo, JP;
Hideya Sakamoto, Tokyo, JP;
Yumiko Kozasa, Tokyo, JP;
Masayoshi Inoue, Tokyo, JP;
Masaru Nanao, Tokyo, JP;
Satoshi Ozawa, Tokyo, JP;
Kumiko Iezumi, Tokyo, JP;
Junichi Yamazaki, Tokyo, JP;
Norimasa Sakamoto, Tokyo, JP;
Takeo Tsukada, Tokyo, JP;
Masahito Furukawa, Tokyo, JP;
Keisuke Itakura, Tokyo, JP;
Hideya Sakamoto, Tokyo, JP;
Yumiko Kozasa, Tokyo, JP;
Masayoshi Inoue, Tokyo, JP;
Masaru Nanao, Tokyo, JP;
Satoshi Ozawa, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
Provided is a piezoelectric ceramic composition capable of being sintered at low temperatures and in a low-oxygen reductive atmosphere and capable of attaining a sufficient displacement even at high voltages of 1 kV/mm or more. The piezoelectric ceramic composition includes: a composite oxide, as a main constituent thereof, represented by the following composition formula; Cu and/or Ag, each as a first additive, Cu being included in a content α, in terms of CuO, falling within a range 0<α≦0.5% by mass and Ag being included in a content β, in terms of AgO, falling within a range 0<β≦0.4% by mass, in relation to the main constituent; wherein: composition formula: Pb[(ZnNb)TiZr]O, where 0.96≦a≦1.03, 0.005≦x<0.05, 0.42≦y≦0.53, 0.45≦z≦0.56, and x+y+z=1.