Magneto-optic disk recording system having improved duty ratio c

Details Magneto-optic disk recording system having improved duty ratio c Magneto-optic disk recording system having improved duty ratio c

1996-10-25

1998-12-29

Neyzari, Ali

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

369124, G11B 1100

Patent

active

058547754

ABSTRACT:
A magneto-optic disk recording system capable of canceling shifts of the front edge and the rear edge of the record mark due to accumulation of heat. The recording system includes a magneto-optic disk having a record magnetic film, and a magnet for applying a bias magnetic field to the disk in the direction perpendicular thereto. The recording system further includes a laser diode for generating laser beams, an optical head for focusing the laser beam on the disk, a pulse generator for generating square wave pulses with a predetermined period, and a duty ratio controller for alternately increasing and decreasing the duty ratio of the square wave pulses every time data "1" of binary record data is generated. The laser diode is driven by a constant-current circuit for write power. There is connected a switch between the laser diode and the constant-current circuit for write power. The switch is turned on/off in accordance with the output pulse of the duty ratio controller so that the laser diode emits a pulsed beam.

REFERENCES:
patent: 5065377 (1991-11-01), Spruit et al.
patent: 5170385 (1992-12-01), Yamada et al.
patent: 5390156 (1995-02-01), Izumi et al.
patent: 5428594 (1995-06-01), Izumi et al.

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