Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1992-10-26
1995-06-27
Levy, Stuart S.
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
369 47, 369 751, G11B 1304
Patent
active
054285836
ABSTRACT:
A magneto-optical disc recording/reproducing apparatus in which a magneto-optical disc, a disc rotating and driving unit, an optical head device, an external magnetic field generating unit and a controlling device are contained as one in an outer casing. That is, the apparatus includes the disc rotating and driving unit which has a diameter of not more than 95 mm and in which the magneto-optical disc is housed and rotationally driven at a constant angular velocity, the optical head device for radiating a light beam to the magneto-optical disc, the external magnetic field generating unit arranged facing the optical head device with the magneto-optical disc in-between and adapted for applying a perpendicular magnetic field to the magneto-optical disc when recording information signals on the magneto-optical disc, the controlling device for controlling the disc rotating and driving unit, the optical head device and the external magnetic field generating unit and the outer casing having a width of not more than 101.6 mm, a depth of not more than 145 mm and a height of not more than 25.4 mm and adapted for accommodating the magneto-optical disc, the disc rotating and driving unit, the optical head device, the external magnetic field generating unit and the controlling device, for increasing the capacity for information signals and reducing the apparatus size.
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Kudo Jun-ichi
Ohmori Kiyoshi
Seo Katsuhiro
Watanabe Tetsu
Ditmyer Paul J.
Levy Stuart S.
Sammut Charles P.
Sony Corporation
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