Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1995-08-04
1997-03-25
Dinh, Tan
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
369116, G11B 1100
Patent
active
056151829
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: 5172364 (1992-12-01), Yoshimoto et al.
patent: 5247509 (1993-09-01), Nakane et al.
Murakami Yoshiteru
Nakajima Junsaku
Nakayama Junichiro
Ohta Kenji
Takahashi Akira
Conlin David G.
Dinh Tan
Michaelis Brian L.
Sharp Kabushiki Kaisha
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