Laser beam adjusting for magnetic field modulation overwrite mag

Details Laser beam adjusting for magnetic field modulation overwrite mag Laser beam adjusting for magnetic field modulation overwrite mag

1997-12-30

1999-11-09

Dinh, Tan

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

369116, 369 54, G11B 1100

Patent

active

059827149

ABSTRACT:
The invention provides a laser strobe type magneto-optical recording apparatus wherein the recording laser power can be set in conformity with an influence of variations such as environmental variations arising from dust sticking to an objective lens, a disk and so forth or secular changes of an optical part, a disk and so forth to assure a high degree of reliability. To a disk initialized with an applied magnetic field of the S pole beforehand, the N pole is applied for a predetermined laser pulse outputting period set after each predetermined fixed interval to record a test pattern. Then, based on a reproduction signal of the test pattern, the recording laser power is adjusted and set so that the length of a pit recorded area formed corresponding to the laser pulse outputting period in the direction of a track may be appropriate.

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