Magnetooptical recording method and apparatus used therefor

Details Magnetooptical recording method and apparatus used therefor Magnetooptical recording method and apparatus used therefor

1990-09-18

1992-07-07

Levy, Stuart S.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360 59, 360 64, G11B 1112, G11B 1304

Patent

active

051289105

ABSTRACT:
In an over-write capable magnetooptical recording method and, more particularly, a bit position recording method, and a recording apparatus used therefor, a laser beam intensity is pulse-modulated between high and low levels according to data to be recorded. The modulated laser beam is radiated on a recording medium under the presence of a bias field. High-level emission time of the laser beam is shortened at the inner portion of the medium, and is prolonged at the outer portion. Low-level intensity of the laser beam is decreased at the inner portion of the medium, and is increased at the outer portion, thereby increasing C/N ratio upon reproduction.

REFERENCES:
patent: 4357635 (1982-11-01), Hasegawa
patent: 4855975 (1989-08-01), Akasaka
patent: 4938915 (1990-07-01), Saito
patent: 4982389 (1991-01-01), Nakao
The Bell System Technical Journal, vol. 62, Sep. 1983, pp. 1923-1936.

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