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:
Nov. 01, 2022
Filed:
Sep. 21, 2020
Tdk Corporation, Tokyo, JP;
Tomokazu Ishikura, Tokyo, JP;
Masanori Ikeda, Tokyo, JP;
Yoshitaka Murakawa, Tokyo, JP;
Hiroyuki Morita, Tokyo, JP;
Shogo Muroya, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
The present invention provides a ferrite sintered magnet comprising ferrite crystal grains having a hexagonal structure, wherein the ferrite sintered magnet comprises metallic elements at an atomic ratio represented by formula (1). In formula (1), R is at least one element selected from the group consisting of Bi and rare-earth elements, and R comprises at least La. In formula (1), w, x, z and m satisfy formulae (2) to (5). The above-mentioned ferrite sintered magnet further has a coefficient of variation of a size of the crystal grains in a section parallel to a c axis of less than 45%.CaRSrFeCo  (1)0.360≤≤0.420  (2)0.110≤≤0.173  (3)8.51≤≤9.71  (4)0.208≤≤0.269  (5)