Optical disc apparatus and focus control method

Details Optical disc apparatus and focus control method Optical disc apparatus and focus control method

2007-08-24

2011-12-20

Haley, Joseph (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S053280, C369S044250, C369S044260, C369S044290, C369S044340, C369S044350, C369S053230, C369S094000

Reexamination Certificate

active

08081543

ABSTRACT:
An optical disc apparatus according to the present invention steadily performs a focus jump operation and a track-crossing seek operation relative to an optical disc having a plurality of recording layers. A signal processing section generates a focus error signal based on a conventional astigmatism detection (CAD) system and a focus error signal based on a differential astigmatism detection (DAD) system from a detection signal generated by an optical detector. When a focus jump is to be performed from one recording layer of the optical disc to another recording layer, a focus drive signal that is generated from the focus error signal based on the CAD system is used. When a read/write operation is to be performed in relation to one recording layer, a focus drive signal that is generated from the focus error signal based on the DAD system is used.

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