Dynamic information storage or retrieval – Storage medium structure – Optical track structure
Patent
1991-08-15
1995-03-21
Nguyen, Hoa T.
Dynamic information storage or retrieval
Storage medium structure
Optical track structure
3692752, 369 13, G11B 724, G11B 1804
Patent
active
054003164
ABSTRACT:
A magnetic optical disc comprising a magnetic optical recording layer on a transparent substrate. The disc measures less than 80 millimeters in outer diameter and is capable of recording at least 130 megabytes of compressed digital signals. The extreme storage density of the disk is achieved by the suppression of double refraction characteristics near the center area of the disk, whereby the minimum diameter of the recording area can be made smaller. This allows a small-diameter magnetic optical disc to provide a recording area of sufficient storage capacity. In combination with a novel magnetic optical recording system, the disc may illustrative accommodate at least 60 minutes of the user's audio signals while measuring smaller than any other conventional discs of comparable storage capacity.
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Nguyen Hoa T.
Sony Corporation
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