| (19) |
 |
|
(11) |
EP 0 535 902 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
03.11.1993 Bulletin 1993/44 |
| (43) |
Date of publication A2: |
|
07.04.1993 Bulletin 1993/14 |
| (22) |
Date of filing: 29.09.1992 |
|
|
| (84) |
Designated Contracting States: |
|
DE FR NL |
| (30) |
Priority: |
30.09.1991 JP 251610/91
21.11.1991 JP 306310/91
30.04.1992 JP 111721/92
|
| (71) |
Applicant: KAWASAKI STEEL CORPORATION |
|
Chuo-Ku, Kobe-City Hyogo 651 (JP) |
|
| (72) |
Inventors: |
|
- Nakatsuka, Satoshi,
Tokyo Head Office
Uchisaiwaicho 2-chome,
Chiyoda-ku,
Tokyo (JP)
- Yasuda, Akira,
Tokyo Head Office
Uchisaiwaicho 2-chome,
Chiyoda-ku,
Tokyo (JP)
- Tanaka, Itsuo,
c/o Technical Research Division
Chiba-shi,
Chiba 260 (JP)
- Nushiro, Koichi,
c/o Technical Research Division
Chiba-shi,
Chiba 260 (JP)
- Kikuchi, Takahiro,c/o Technical Research Division
Chiba-shi,
Chiba 260 (JP)
|
| (74) |
Representative: Overbury, Richard Douglas et al |
|
Haseltine Lake & Co
Hazlitt House
28, Southampton Buildings
Chancery Lane
London WC2A 1AT
London WC2A 1AT (GB) |
|
| |
|
| (54) |
Internal closed magnetic circuit anisotropic magnet and method |
(57) An internal closed magnetic circuit anisotropic magnet magnetic particles orientation
region serving as a working surface. Axes of easy magnetization are oriented to pass
through the of the magnet from the edge portion to focus on the working surface.
The magnet is produced by supplying a fluid magnet raw material to a magnetic orientation
molding machine, and molding the raw material while applying a magnetic field thereto.
A pulsed strong magnetic field is applied by pulsatively passing a large current through
an exciting coil a different magnetic field is applied for orienting the magnetic
particles.