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:
Apr. 13, 2010
Filed:
Jun. 08, 2007
Mitsuru Kojima, Narita, JP;
Miyuki Yanagida, Narita, JP;
Masakazu Hosono, Abiko, JP;
Yasuo Watanabe, Narita, JP;
Akira Sato, Inba-gun, JP;
Mitsuru Kojima, Narita, JP;
Miyuki Yanagida, Narita, JP;
Masakazu Hosono, Abiko, JP;
Yasuo Watanabe, Narita, JP;
Akira Sato, Inba-gun, JP;
TDK Corporation, Tokyo, JP;
Abstract
A production method of a dielectric ceramic composition comprising a main component including barium titanate expressed by a composition formula of BaTiO, wherein 'm' satisfies 0.990<m<1.010, a fourth subcomponent including an oxide of R (note that R is at least one selected from Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu), and other subcomponent including at least BaO; comprising steps of preparing a post-reaction material by bringing a material of said main component to react in advance with at least a part of a material of said fourth subcomponent, wherein, when an amount of BaO included in said other subcomponent is n mole with respect to 100 moles of said main component, and said main component and said BaO are expressed by a composition formula of BaTiO, wherein 'm' and “n” satisfy 0.994<m+n/100<1.014; by which a dielectric ceramic composition capable of improving the specific permittivity without deteriorating the capacity-temperature characteristic, IR and IR accelerated lifetime, etc. and the production method can be provided.