Optical disk tracking method and device for producing a tracking

Details Optical disk tracking method and device for producing a tracking Optical disk tracking method and device for producing a tracking

1997-02-20

1998-10-27

Hindi, Nabil

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4441, 369 4428, 369110, 369 4434, G11B 700

Patent

active

058286349

ABSTRACT:
An optical disk device includes an optical system having a beam converting unit and an objective lens. The beam converting unit converts a beam of laser light emitted by a laser light source into a main beam and at least one sub-beam. The objective lens places a main spot on the disk by the main beam and at least one sub-spot on the disk by the sub-beam, such that, when the main spot is on a center line of one of lands and grooves of an optical disk, the sub-spot is between the center line of one of the lands and the grooves and a center line of an adjacent one of the lands and the grooves. A first unit produces a first push-pull signal from a reflection beam from the main spot on the disk. A second unit produces a second push-pull signal from a reflection beam from the sub-spot on the disk. A tracking error signal generating unit produces a tracking error signal based upon the first push-pull signal. A track crossing signal generating unit produces a track crossing signal based upon the second push-pull signal.

REFERENCES:
patent: 5440535 (1995-08-01), Takagi et al.
patent: 5594711 (1997-01-01), Koyama
patent: 5638350 (1997-06-01), Fuji
patent: 5671199 (1997-09-01), Nishikawa

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