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. 11, 2023
Filed:
Oct. 14, 2020
Applicant:
Tdk Corporation, Tokyo, JP;
Inventors:
Yoshitaka Murakawa, Tokyo, JP;
Hiroyuki Morita, Tokyo, JP;
Masanori Ikeda, Tokyo, JP;
Shogo Muroya, Tokyo, JP;
Tomokazu Ishikura, Tokyo, JP;
Assignee:
TDK Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01F 1/03 (2006.01); H01F 1/11 (2006.01); H01F 1/08 (2006.01); C04B 35/26 (2006.01); H01F 1/10 (2006.01);
U.S. Cl.
CPC ...
H01F 1/0315 (2013.01); C04B 35/2633 (2013.01); C04B 35/2683 (2013.01); H01F 1/086 (2013.01); H01F 1/10 (2013.01); H01F 1/11 (2013.01); C04B 2235/3208 (2013.01); C04B 2235/3241 (2013.01); C04B 2235/3262 (2013.01); C04B 2235/3409 (2013.01); C04B 2235/3418 (2013.01); C04B 2235/767 (2013.01); C04B 2235/85 (2013.01);
Abstract
A ferrite sintered magnetcomprises M-type ferrite crystal grainsand multiple-crystal grain boundariessurrounded by three or more of the M-type ferrite crystal grains. The ferrite sintered magnetcontains at least Fe, Ca, B, and Si, and contains 0.005 to 0.9 mass % of B in terms of BO. The multiple-crystal grain boundariescontain Si and Ca, and in a case where the molar ratio of Ca to Si in the multiple-crystal grain boundariesis represented by (Ca/Si), the following formula is satisfied.0.1<(Ca/Si)<0.9