Magneto-optical disk and the reproducing method thereof

Details Magneto-optical disk and the reproducing method thereof Magneto-optical disk and the reproducing method thereof

1994-11-16

1995-12-19

Nguyen, Viet Q.

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

3692751, 3692753, 369272, 360135, G11B 700

Patent

active

054775280

ABSTRACT:
A magneto-optical disk, which possesses a disc-shaped substrate and a recording layer composed of a perpendicular magnetization film that is formed on the substrate, characterized in having: an area wherein magnetic domains having an upward magnetization and magnetic domains having a downward magnetization are alternately aligned along at least one circuit of the disk, the area being formed on the recording layer, the length of the magnetic domains having the upward magnetization being virtually equal to the length of the magnetic domains having the downward magnetization. This invention also has a reproducing method which is characterized in that, when information is reproduced by projecting a light beam onto the magneto-optical recording disk, the intensity of the light beam is adjusted so as to maximize the amplitude of a reproduced signal that is obtained from the area. With the above arrangement, a high-quality reproduced signal can be obtained independent of the characteristics of individual magneto-optical disks.

REFERENCES:
patent: 5168482 (1992-12-01), Aratani et al.
patent: 5175714 (1992-12-01), Kikitsu et al.
patent: 5233578 (1993-08-01), Yamamoto et al.
Super Resolution in Magneto-Optical Disks, (Technical Research Reports of Japan Applied Magnetics Institute , vol. 15, No. 5, 1991).

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