Reading method for magneto-optical recording disc, magneto-optic

Details Reading method for magneto-optical recording disc, magneto-optic Reading method for magneto-optical recording disc, magneto-optic

1998-05-27

1999-12-28

Dinh, Tan

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

369 14, G11B 1100

Patent

active

060090502

ABSTRACT:
The invention provides a method which can be performed on the same device with application of a modulated magnetic field to read a magneto-optical recording disk through a series of processes involving "copy of recorded magnetic domains.fwdarw.enlargement of copied magnetic domains.fwdarw.reproduction of copied magnetic domains.fwdarw.size reduction and disappearance of copied magnetic domains", and to read an ordinary magneto-optical recording medium. For reading information recorded on the first magneto-optical recording disk, the first magneto-optical recording disk is irradiated with a laser beam having a first reading power, and the alternating magnetic field is then applied thereto after synchronization by which the alternating magnetic field is applied thereto at a recorded mark position. For reading information recorded on the second magneto-optical recording disk, the second magneto-optical recording disk is irradiated with a second laser beam.

REFERENCES:
patent: 4837758 (1989-06-01), Motoyama et al.
patent: 5202863 (1993-04-01), Miyatake et al.
patent: 5313444 (1994-05-01), Ishii et al.
patent: 5434831 (1995-07-01), Ishii et al.
patent: 5444678 (1995-08-01), Ogata

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