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:
Mar. 04, 2025
Filed:
Mar. 27, 2020
Tdk Corporation, Tokyo, JP;
Masashi Ohmura, Tokyo, JP;
Junichi Nagaoka, Tokyo, JP;
Shogo Muroya, Tokyo, JP;
Takuma Abe, Tokyo, JP;
Jo Sato, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
A ferrite sinter magnet has a ferrite phase having a magnetoplumbite-type crystal structure, and contains at least a metal element A, a metal element R, Fe, Co, Zn, and B. The element A is at least one kind of element selected from the group consisting of Sr, Ba, Ca, and Pb, and essentially includes Ca. the element R is at least one kind selected from the group consisting of Bi and rare-earth elements including Y, and essentially includes La. Atomic ratios of the metal elements satisfy the following Expressions (1) to (5),ARFeCoZn (1)0.40≤≤0.70 (2)8.20≤≤9.34 (3)0.05≤≤0.50 (4)0<≤0.20 (5) The content of Si is 0 to 0.60% by mass in terms of SiO, and the content of B is 0.1-0.70% by mass in terms of BO.