Optical disc apparatus and tracking control method

Details Optical disc apparatus and tracking control method Optical disc apparatus and tracking control method

2007-09-18

2007-09-18

Tran, Thang V. (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S044370, C369S044410

Reexamination Certificate

active

10478220

ABSTRACT:
In a configuration in which side beams scan in positions that are offset with respect to a main beam by approximately (¼+n)P or (¾+n)P in the radial direction of an optical disk, a differential signal is generated from push-pull signals of the return lights of the side beams to generate a track-cross signal. In a configuration in which side beams scan in positions that are offset with respect to a main beam by approximately (¼+n)P or (¾+n)P in the radial direction of an optical disk, far-side or near-side light detection results of the return lights of the side beams are processed and computed with respect to a push-pull signal of the return light of the main beam.

REFERENCES:
patent: 4689779 (1987-08-01), Hayashi et al.
patent: 5084849 (1992-01-01), Ishii et al.
patent: 6388983 (2002-05-01), Kikuchi
patent: 9-288831 (1997-11-01), None
patent: 2000-3525 (2000-01-01), None
patent: 2000-251274 (2000-09-01), None

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