Optical disk initializing apparatus

Details Optical disk initializing apparatus Optical disk initializing apparatus

1997-03-10

1998-07-21

Edun, Muhammed N.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369112, G11B 700

Patent

active

057843538

ABSTRACT:
An optical disk initializing apparatus includes the first optical system having a gain waveguide laser, a collimator lens, diffraction gratings, and a 45.degree. mirror, the second optical system having a 680-nm red laser, a polarizing beam splitter, a collimator lens, and a .lambda./4 plate, a dichroic mirror, an objective lens, an optical sensor, a phase compensator, a voltage-current conversion amplifier, and an objective lens actuator. The first optical system outputs a first beam for initialization. The second optical system outputs a second beam having a wavelength different from that of the first beam. The dichroic mirror multiplexes the beam emerging from the first optical system and the second beam emerging from the second optical system. The objective lens focuses an output beam emerging from the dichroic mirror on a phase change recording or magneto-optical recording optical disk. The optical sensor detects a focusing error signal from a return beam of the second beam reflected by the optical disk. The phase compensator, the voltage-current conversion amplifier, and the objective lens actuator focus the objective lens in accordance with the focusing error signal output from the optical sensor.

REFERENCES:
patent: 5513164 (1996-04-01), Tanaka et al.

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