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. 08, 2013
Filed:
Apr. 23, 2012
Matahiro Komuro, Hitachi, JP;
Yuichi Satsu, Hitachi, JP;
Yoshii Morishita, Tsukuba, JP;
Shigeaki Funyu, Tsuchiura, JP;
Mitsuo Katayose, Tsukuba, JP;
Matahiro Komuro, Hitachi, JP;
Yuichi Satsu, Hitachi, JP;
Yoshii Morishita, Tsukuba, JP;
Shigeaki Funyu, Tsuchiura, JP;
Mitsuo Katayose, Tsukuba, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An R—Fe—B sintered magnet has a structure including main phase crystal grains and a grain boundary area surrounding the crystal grains. The sintered magnet includes fluorine and a specified metal element selected from elements belonging to Group 2 through Group 16 of periodic table excepting the rare earth element, carbon and boron. The fluorine has a higher concentration in a region closer to a magnet surface than in the center. The specified element also has a higher concentration in the region closer to the surface. The sintered magnet includes oxyfluoride containing carbon, Dy and the metal element in a grain boundary area region at a distance of 1 μm or greater from the magnet surface, and the carbon has a higher concentration than the concentration of the metal element in a region at a distance of 1 μm to 500 μm from the magnet surface.