Optical disc apparatus, an optical disc method, and a...

Details Optical disc apparatus, an optical disc method, and a... Optical disc apparatus, an optical disc method, and a...

2008-05-27

2008-05-27

Korzuch, William (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S044230, C369S053310

Reexamination Certificate

active

11006179

ABSTRACT:
An optical disc apparatus includes a control section. The control section performs a first search while the tracking control is in the off state. The first search is for searching for a plurality of sets of the focus positions of the light beam and the spherical aberration amounts such that an amplitude of the tracking error signal is greater than a predetermined value. The control section performs a second search while the tracking control is in the on state. The second search is for determining a set of the focus position of the light beam and the spherical aberration amount such that the reproduced signal quality index is substantially optimal, among the plurality of sets of the focus positions of the light beam and the spherical aberration amounts obtained in the first search.

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patent: 1318507 (2003-06-01), None
patent: 2002-342952 (2002-11-01), None

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