Optical disc apparatus

Details Optical disc apparatus Optical disc apparatus

2006-03-28

2006-03-28

Korzuch, William (Department: 2653)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S044270, C369S047390, C369S053370, C369S044250

Reexamination Certificate

active

07020053

ABSTRACT:
In an initial operation of an optical disc apparatus for reading out information data recorded in the innermost data recording area on the optical disc, a main processor judges whether periods between adjoining two pits are normal or not from signals outputted from an optical pickup. When the periods of the pits are normal, a light beam emitted from the optical pickup is on the present data recording track, and the information data is read out from the optical disc. Alternatively, when the periods of the pits are abnormal, the optical pickup is moved inwardly with sensing the periods of the pits and judges whether the periods are normal or not. When the periods of the pits become normal, the light beam is precisely tracked on the present data recording track, and reproduces the information data from the optical disc.

REFERENCES:
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patent: 6801488 (2004-10-01), Kato et al.
patent: 6804176 (2004-10-01), Komazaki
patent: 6885623 (2005-04-01), Oishi et al.
patent: 11-053836 (1999-02-01), None

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