Magnetooptical information recording and/or reproducing method a

Details Magnetooptical information recording and/or reproducing method a Magnetooptical information recording and/or reproducing method a

1993-03-25

1996-12-03

Pascal, Robert

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 13, 369 54, G11B 1700

Patent

active

055815243

ABSTRACT:
Recording of information on and/or reproduction of information from a magnetooptical recording medium is effected as follows. A light beam from an objective lens is irradiated on a track of the recording medium. The objective lens is driven in a direction perpendicular to the track such that the beam spot and the track have a predetermined positional relationship therebetween. A magnetic field modulated according to information to be recorded is applied to the beam spot irradiated position of the recording medium by a magnetic field applying device. A relative position between the objective lens and the magnetic field applying device in the direction perpendicular to the track is detected. The recording of information is effected on the recording medium by applying the magnetic field according to the information while changing the beam spot irradiated position on the recording medium with respect to the track. The movable range of the objective lens, in which a level of a reproduction signal obtained in the reproduction of information exceeds a predetermined level, in the direction perpendicular to the track, in the recording operation, is detected on the basis of a detection result of the relative position, so that a driver for the objective lens is controlled on the basis of the detected movable range.

REFERENCES:
patent: 4868802 (1989-09-01), Kobori
patent: 5043972 (1991-08-01), Kurihara et al.
patent: 5159584 (1992-10-01), Yanagida et al.
patent: 5193080 (1993-03-01), Mohri et al.
Patent Abstracts of Japan, Kokai No. 01-089054, vol. 13, No. 322, Jul. 1989.
Patent Abstracts of Japan, Kokai No. 01-155504, vol. 13, No. 424, Sep. 1989.
Patent Abstracts of Japan, Kokai No. 02-021444, vol. 14, No. 165, Mar. 1990.
Patent Abstracts of Japan, Kokai No. 02-193346, vol. 14, No. 482, Oct. 1990 .

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