Method for distinguishing unbalanced disc

Details Method for distinguishing unbalanced disc Method for distinguishing unbalanced disc

2011-08-02

2011-08-02

Pardo, Thuy (Department: 2627)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S053150, C369S047100

Reexamination Certificate

active

07990824

ABSTRACT:
A method for distinguishing unbalanced disc in an optical disc reproducing/recording apparatus, comprising following steps: moving an optical pickup head to a first position of an optical disc; rotating the optical disc to a predetermined rotating speed; transferring a focus error signal produced by the optical pickup head to a focus control voltage signal; controlling the optical pickup head by the focus control voltage signal to maintain a focus light spot produced by the optical pickup head on the optical disc; and distinguishing if the optical disc is an unbalanced disc according to the focus control voltage signal.

REFERENCES:
patent: 4727530 (1988-02-01), Tomisawa
patent: 7289405 (2007-10-01), Kim et al.
patent: 2002/0118619 (2002-08-01), Tomishima
patent: 2004/0013066 (2004-01-01), Oono et al.
patent: 2004/0037194 (2004-02-01), Pan
patent: 2005/0068872 (2005-03-01), Kim et al.
patent: 2005/0081626 (2005-04-01), Lin et al.
patent: 2006/0077813 (2006-04-01), Chuang et al.

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