Optical disk apparatus

Details Optical disk apparatus Optical disk apparatus

1996-07-29

2000-01-04

Hindi, Nabil

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4425, G11B 700

Patent

active

060117621

ABSTRACT:
An optical disk apparatus comprises a focusing means for focusing a light beam on a recording medium having first and second information faces; means for moving a focal point of the light beam in a direction substantially perpendicular to the information faces of the recording medium; means for detecting a focus condition of the light beam on the basis of an output signal from the reflected light detecting means; a focus control means for driving the focal point moving means on the basis of an output signal from the focus condition detecting means, and controlling the light beam so that the focus condition of the light beam becomes a prescribed focus condition; and a focus jumping means for moving the focal point of the light beam from the first information face to the second information face by driving the focal point moving means.

REFERENCES:
patent: 5671203 (1997-09-01), Ra
patent: 5684773 (1997-11-01), Hayashi
patent: 5710749 (1998-01-01), Tsuaki et al.
patent: 5724325 (1998-03-01), Jeong
patent: 5754507 (1998-05-01), Nishikata
patent: 5757743 (1998-05-01), Decusatis et al.

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