Title:
MAGNETIC CIRCUIT, FARADAY ROTATOR, AND MAGNETO-OPTIC ELEMENT
Document Type and Number:
WIPO Patent Application WO/2019/230420
Kind Code:
A1
Abstract:
Provided is a magnetic circuit in which irreversible demagnetization due to an external magnetic field or a temperature increase can be suppressed, and magnetic flux density adequate for a Faraday element can be stably provided. A magnetic circuit 1 having first through third magnets comprising samarium-cobalt-based magnets each provided with a through hole through which light passes, wherein the magnetic circuit 1 is characterized in that: the first through third magnets are disposed in this order on the same axis in a front-rear direction; when the direction in which light passes through the through holes of the magnetic circuit 1 is defined as the optical axis direction, the first magnet 11 is magnetized in the direction perpendicular to the optical axis direction and so that the through-hole side thereof is the N pole thereof, the second magnet 12 is magnetized in the direction parallel to the optical axis direction and so that the first magnet 11 side thereof is the N pole thereof, and the third magnet 13 is magnetized in the direction perpendicular to the optical axis direction and so that the through-hole side thereof is the S pole thereof; and the second magnet 12 has a coercivity equal to or greater than the coercivity of the first and third magnets.
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Inventors:
SUZUKI FUTOSHI (JP)
ODAWARA SHUNYA (JP)
ODAWARA SHUNYA (JP)
Application Number:
PCT/JP2019/019503
Publication Date:
December 05, 2019
Filing Date:
May 16, 2019
Export Citation:
Assignee:
NIPPON ELECTRIC GLASS CO (JP)
International Classes:
G02B27/28; G02B5/30; H01F7/02
Domestic Patent References:
| WO2011078381A1 | 2011-06-30 |
Foreign References:
| JP2016180858A | 2016-10-13 | |||
| JPH11101955A | 1999-04-13 | |||
| US20150198823A1 | 2015-07-16 | |||
| JP2000241765A | 2000-09-08 |
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