Method and apparatus for tracking correction and optical disk fo

Details Method and apparatus for tracking correction and optical disk fo Method and apparatus for tracking correction and optical disk fo

1996-04-25

1998-02-03

Tran, Thang V.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4429, 369 4434, 3692754, G11B 7095

Patent

active

057152179

ABSTRACT:
An optical disk is provided with grooves, which have first and second regions. A first side wall of a groove in the first region is wabbled, while a second side wall of the groove, which is opposite to the wabbled side wall in the first region, is wabbled in the second region. The tracking of a light beam is carried out with respect to the first and second regions, so that first amplitude of a first wabble signal and second amplitude of a second wabble signal, which are contained in a tracking error signal, are obtained. The first and second amplitude are compared, and a correction signal which varies depending on the difference in the amplitude is given to the tracking error signal, so that the first and the second amplitude are corrected to be substantially equal. Thus, it is possible to correct a deviation caused by an error in conditioning optical elements, an aberration of optical elements, and a change due to aging.

REFERENCES:
patent: 5185732 (1993-02-01), Ogawa et al.
patent: 5315567 (1994-05-01), Fuji et al.
patent: 5383169 (1995-01-01), Shinoda et al.
patent: 5406545 (1995-04-01), Kadowaki
patent: 5459706 (1995-10-01), Ogawa et al.

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