Optical disc device and focus control method

Details Optical disc device and focus control method Optical disc device and focus control method

2011-07-12

2011-07-12

Young, Wayne R (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S044260, C369S044370

Reexamination Certificate

active

07978569

ABSTRACT:
A focus control section first performs a reference focus control process in which a reference optical beam is focused on a reference layer of an optical disc according to the result of receiving a reference reflection optical beam, and then switches from the reference focus control process to an information focus control process in which an information optical beam is focused on a mark layer of the optical disc according to the result of receiving an information reflection optical beam.

REFERENCES:
patent: 2002/0191501 (2002-12-01), Ueno
patent: 2004/0001400 (2004-01-01), Amble et al.
patent: 2006/0291360 (2006-12-01), Maeda et al.
patent: 4-301226 (1992-10-01), None
patent: 2001-357542 (2001-12-01), None
patent: 2003-338048 (2003-11-01), None
patent: 2007-220206 (2007-08-01), None
patent: 2008-52793 (2008-03-01), None
patent: WO 2007/094456 (2007-08-01), None
U.S. Appl. No. 12/272,179, filed Nov. 17, 2008, Saito, et al.

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