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:
Jun. 05, 2012
Filed:
Feb. 21, 2008
Sanshiro Aman, Narita, JP;
Takashi Kojima, Narita, JP;
Mari Miyauchi, Narita, JP;
Masakazu Hosono, Narita, JP;
Dan Sakurai, Yurihonjo, JP;
Kosuke Takano, Narita, JP;
Nobuto Morigasaki, Narita, JP;
Sanshiro Aman, Narita, JP;
Takashi Kojima, Narita, JP;
Mari Miyauchi, Narita, JP;
Masakazu Hosono, Narita, JP;
Dan Sakurai, Yurihonjo, JP;
Kosuke Takano, Narita, JP;
Nobuto Morigasaki, Narita, JP;
TDK Corporation, Tokyo, JP;
Abstract
A dielectric ceramic composition comprises a main component including BaTiO, a first subcomponent including BaZrO, a second subcomponent including an oxide of Mg, a third subcomponent including an oxide of rare earth, a fourth subcomponent including an oxide of at least one element selected from Mn, Cr, Co and Fe, and a fifth subcomponent including an oxide of at least one element selected from Si, Al, Ge, B and Li. At least a part of dielectric particles constituting the dielectric ceramic composition comprises a surface diffusion structure comprised of a central layer and a diffusion layer therearound. CR and CRmax, respectively defined as a concentration of said 'R' in a proximity point to a boundary face of the dielectric particle and a maximum concentration of the 'R' in the diffusion layer, satisfy a relation of CRmax/CR>1. Also, CM and CMmax, respectively defined as a concentration of said Mg in a proximity point to a boundary face of the dielectric particle and a maximum concentration of Mg in the diffusion layer, satisfy a relation of CMmax/CM>1.