Method and device for timely outputting focusing completion...

Details Method and device for timely outputting focusing completion... Method and device for timely outputting focusing completion...

2006-04-25

2006-04-25

Hindi, Nabil (Department: 2655)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S044250

Reexamination Certificate

active

07035176

ABSTRACT:
A method is provided for outputting a focusing completion signal to realize a focusing condition of an optical pickup head for an optical access apparatus. The method is described as follows. A trace shift of the optical pickup head along a focusing direction is actuated in response to a focus control signal when a focus adjustment operation starts. Then, a focusing error signal and a sub-beam addition signal are generated in response to optical signals from the optical pickup head. A closed-loop enable signal is generated to enable a closed-loop control operation in response to a specified situation of the focusing error signal. The focusing completion signal is outputted when the sub-beam addition signal is at a level greater than a threshold value and when the closed-loop enable signal is generated.

REFERENCES:
patent: 4952816 (1990-08-01), Dunning
patent: 5894463 (1999-04-01), Okawa et al.

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