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:
Oct. 19, 2004
Filed:
Jul. 09, 2003
Applicant:
Inventors:
Tomoyuki Ogawa, Toyama-ken, JP;
Katsuhiro Horikawa, Omihachiman, JP;
Toshikatsu Hisaki, Shiga-ken, JP;
Assignee:
Murata Manufacturing Co. Ltd, , JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01L 4/1187 ;
U.S. Cl.
CPC ...
H01L 4/1187 ;
Abstract
A piezoelectric ceramic composition is expressed by the formula Pb [{Ni Nb } Ti Zr ]O . The B site variables x, y, and z lie in a predetermined region in a ternary diagram. The Ni—Nb molar proportion variable satisfies the relationship 0.85≦w<1.00. The Pb molar content &agr; is reduced from the stoichiometric ratio to a value satisfying the relationship 0.950≦&agr;≦0.995. At least one element selected from the group consisting of Sr, Ca, and Ba may be substituted for about 10 mol percent of the Pb.