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. 02, 2009
Filed:
Jan. 23, 2007
Tomokazu Ishikura, Tokyo, JP;
Shinichi Sakano, Tokyo, JP;
Masahiko Watanabe, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
For the purpose of providing a Mn—Zn based ferrite material that is small in magnetic field degradation in high frequency bands of 1 MHz or more, the Mn—Zn based ferrite material includes: as main constituents, FeO: 53 to 56 mol %, ZnO: 7 mol % or less (inclusive of 0 mol %), and the balance: MnO; and as additives, Co: 0.15 to 0.65% by weight in terms of CoO, Si: 0.01 to 0.045% by weight in terms of SiOand Ca: 0.05 to 0.40% by weight in terms of CaCO; wherein the δ value (the cation defect amount) defined in the present specification satisfies the relation 3×10≦δ≦7×10; and the mean grain size is larger than 8 μm and 15 μm or less.