Dynamic information storage or retrieval – Storage medium structure – Optical track structure
Patent
1995-02-03
1996-07-02
Dinh, Tan
Dynamic information storage or retrieval
Storage medium structure
Optical track structure
369 13, G11B 1100
Patent
active
055330010
ABSTRACT:
A magneto-optical disc system includes a magneto-optical disc with a light-transmitting cover, an objective lens for bundling or focusing a laser beam on a magnetic recording layer of the magneto-optical disc in order to perform recording and/or reproduction, and a magnetic field generating unit obtained by forming a coil pattern in an optical glass. In the above system, the thickness t.sub.2 of the light-transmitting cover is set to fall within the range of 0.6 to 0.1 mm, and the numerical aperture (NA) of the objective lens is set to fall within the range of 0.55 to 0.70, so as to obtain high-density recording and/or reproduction by permitting the lens to be quite close to the actual recording layer.
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Aoki Yoshio
Watanabe Tetsu
Dinh Tan
Maioli Jay H.
Sony Corporation
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