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. 14, 2005
Filed:
Aug. 29, 2003
Yuji Sezai, Tokyo, JP;
Katsushi Yasuhara, Tokyo, JP;
Kenya Takagawa, Tokyo, JP;
Masahiko Watanabe, Tokyo, JP;
Yuji Sezai, Tokyo, JP;
Katsushi Yasuhara, Tokyo, JP;
Kenya Takagawa, Tokyo, JP;
Masahiko Watanabe, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
An Mn—Zn ferrite wherein 0 to 5000 ppm of a Co oxide in a CoOconversion is contained in a basic component constituted by FeO: 51.5 to 57.0 mol % and ZnO: 0 to 15 mol % (note that 0 is not included) wherein the rest is substantially constituted by MnO; and a value α in a formula (1) below in said ferrite satisfies α≧0.93.α=((Fe−Mn−Co)×(4.291.912.192.01))/(()×100)  formula (1).Note that in the formula (1), (Fe−Mn−Co): [wt %], A: FeO[mol %], B: MnO [mol %], C: ZnO [mol %] and D: CoO [mol %]. According to the present invention, a highly reliable Mn—Zn ferrite used as a magnetic core of a power supply transformer, etc. of a switching power supply, etc., having a small core loss in a wide temperature range, furthermore, exhibiting a little deterioration of core loss characteristics under a high temperature (in a high temperature storage test) and having excellent magnetic stability, a transformer magnetic core and a transformer can be provided.