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Title:
RARE-EARTH SINTERED MAGNET AND RARE-EARTH SINTERED MAGNET SINTERED BODY FOR USE WITH SAME, AND MAGNETIC FIELD APPLYING DEVICE USABLE FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2018/207777
Kind Code:
A1
Abstract:
Provided is a rare-earth sintered magnet and the like with which a magnetic flux having a practically useful surface magnetic flux density can be generated only in one surface in a thickness direction, without increasing the size or weight of a magnet unit. The rare-earth sintered magnet has a configuration in which a number of magnet material particles including a rare-earth substance and each having an axis of easy magnetization have been integrally sintered. The rare-earth sintered magnet is provided with a first surface and a second surface opposing each other in the thickness direction. In a plane parallel with a width direction and the thickness direction, the magnet material particles are magnetized such that, in a region extending from each of both ends in the width direction toward the center in the width direction, the orientation direction of the axis of easy magnetization is gradually changed. A maximum surface magnetic flux density in the first surface and a maximum surface magnetic flux density in the second surface satisfy the relationship (D1/D2) ≥ 4. The orientation direction of the axis of easy magnetization may vary between each of both ends in the width direction and the center in the width direction by 90°±5° or 180°±5°.

Inventors:
FUJIKAWA Kenichi (1-2 Shimohozumi 1-chome, Ibaraki-sh, Osaka 80, 〒5678680, JP)
YAMAMOTO Takashi (1-2 Shimohozumi 1-chome, Ibaraki-sh, Osaka 80, 〒5678680, JP)
SAITO Shoichiro (1-2 Shimohozumi 1-chome, Ibaraki-sh, Osaka 80, 〒5678680, JP)
OZAKI Takashi (1-2 Shimohozumi 1-chome, Ibaraki-sh, Osaka 80, 〒5678680, JP)
KUME Katsuya (1-2 Shimohozumi 1-chome, Ibaraki-sh, Osaka 80, 〒5678680, JP)
Application Number:
JP2018/017794
Publication Date:
November 15, 2018
Filing Date:
May 08, 2018
Export Citation:
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Assignee:
NITTO DENKO CORPORATION (1-2 Shimohozumi 1-chome, Ibaraki-shi Osaka, 80, 〒5678680, JP)
International Classes:
H01F1/057; H01F7/02; H01F13/00
Foreign References:
JPH0661036A1994-03-04
JPH0418410U1992-02-17
JPS622213U1987-01-08
JP2004297843A2004-10-21
Attorney, Agent or Firm:
TANAKA Shinichiro et al. (NAKAMURA & PARTNERS, Shin-Tokyo Bldg. 3-1, Marunouchi 3-chome, Chiyoda-k, Tokyo 55, 〒1008355, JP)
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