Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1993-07-29
1994-05-31
Nguyen, Hoa T.
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
360 59, 360 66, 360114, G11B 1304, G11B 1112, G11B 1110
Patent
active
053175484
ABSTRACT:
A magnetic bias apparatus for generating a magnetic field for recording or erasing information in the magnetooptical disk drive apparatus is disclosed. The magnetic bias apparatus has a permanent magnet for generating a bias magnetic field which is rotatable about a rotating axis, a coil for rotating the permanent magnet and a circuit for driving the coil. The central axis of the coil is directed toward the rotating axis parallel to the plane of a magnetoptical disk and perpendicular to a plane of the permanent magnet defined by the two poles and extending through the central axis. The apparatus can be constructed in a reduced height while the permanent magnet can be rapidly rotated.
REFERENCES:
patent: 4701895 (1987-10-01), VanSant
patent: 4748606 (1988-05-01), Naito et al.
patent: 4962492 (1990-10-01), Mathildus et al.
patent: 4972337 (1990-11-01), Eguchi et al.
patent: 4984224 (1991-01-01), Tsuyuguchi et al.
Copy of European Patent Office Search Report for Application 90 12 3348.
Kuroda Motoki
Matsuda Nobuhide
Matsushita Electric - Industrial Co., Ltd.
Nguyen Hoa T.
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