Apparatus for applying bias magnetic field including a rotatable

Details Apparatus for applying bias magnetic field including a rotatable Apparatus for applying bias magnetic field including a rotatable

1993-08-24

1994-09-27

Nguyen, Hoa T.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360114, 360 59, 360 66, G11B 503, G11B 1304, G11B 1114

Patent

active

053512219

ABSTRACT:
An apparatus for applying a bias magnetic field has a magnet rotatably supported around a rotational axis parallel to a face of a magnetooptic disk and magnetized in a direction perpendicular to the rotational axis; a coil section for controlling the rotation of the magnet by flowing a driving electric current therethrough; and a first coil constituting the coil section and having a first portion parallel to the rotational axis and located on a side opposite to the magnetooptic disk with respect to the magnet, the first coil further having a second portion parallel to the rotational axis and arranged on a side of the magnet in a position near the magnetooptic disk in comparison with the rotational axis. The first coil may have a third portion for connecting both ends of the first and second portions. The coil section may have a second coil constituting the coil section and constructed such that the first and second coils are approximately arranged symmetrically with respect to a plane including the rotational axis and perpendicular to the face of the magnetooptic disk. Another bias magnetic field applying apparatus is also shown. The bias magnetic field applying apparatus may have an auxiliary coil for preventing deadlock of the magnet.

REFERENCES:
patent: 4701895 (1987-10-01), Van Sant
patent: 4748606 (1988-05-01), Naito
patent: 4962492 (1990-10-01), Mathildus
patent: 4979158 (1990-12-01), Yoda
patent: 5020042 (1991-05-01), Fearnside
patent: 5291345 (1994-03-01), Umeda et al.

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