Method for reproducing information recorded on a magneto-optical

Details Method for reproducing information recorded on a magneto-optical Method for reproducing information recorded on a magneto-optical

1994-04-26

1994-11-22

Nguyen, Hoa T.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360 59, G11B 1304, G11B 1112, G11B 1110

Patent

active

053675096

ABSTRACT:
This invention is directed to an improvement in a novel magneto-optical disc reproducing method of the record information erasing type or the record information raised or transfer type wherein a technique is employed to prevent the dimension of an actual reproduction region from varying by a change of temperature or linear velocity of a magneto-optical disc. To realize this, reference information is recorded on a magneto-optical disc to reproduce this reference information prior to actual data reproduction to detect the regenerative RF signal level to control a laser power or an external magnetic field so that the regenerative RF signal level becomes equal to a level optimum for reproduction, thus allowing the dimension of an actual reproduction region to be an optimum fixed dimension at all times. At the time of actual reproduction, control is made so that the controlled laser power or external magnetic field is maintained.

REFERENCES:
patent: 4688203 (1987-08-01), Koishi et al.
patent: 4932012 (1990-06-01), Kobayashi
patent: 5018119 (1991-05-01), Aratani et al.
patent: 5168482 (1992-12-01), Aratani et al.
patent: 5204847 (1993-04-01), Tayefeh
patent: 5218581 (1993-06-01), Ohta et al.

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