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:
Jan. 17, 2017
Filed:
Mar. 28, 2014
Tdk Corporation, Tokyo, JP;
Eiji Kato, Tokyo, JP;
Yoshinori Fujikawa, Tokyo, JP;
Taeko Tsubokura, Tokyo, JP;
Chikara Ishizaka, Tokyo, JP;
Katsuo Sato, Ichikawa, JP;
TDK CORPORATION, Tokyo, JP;
Abstract
The present invention provides a rare earth based magnet having a microstructure in which in a section of the RTB main-phase crystal grains, the number density of the fine products in the interior of (inside) the crystal grains is larger than that in the periphery of (outside) the crystal grains. That is, the rare earth based magnet includes RTB main-phase crystal grains and grain boundary phases formed between the RTB main-phase crystal grains. The RTB main-phase crystal grains include a substance where fine products are formed in the crystal grains. In the section of the main-phase crystal grains, when the crystal grains are divided into the interior of the crystal grains and the periphery of the crystal grains with a specific ellipse, the fine products are formed such that the number density in the interior is larger than that in the periphery.