Focus servo controlling method and apparatus and optical...

Details Focus servo controlling method and apparatus and optical... Focus servo controlling method and apparatus and optical...

2008-10-07

2011-12-27

Haley, Joseph (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S053230, C369S044250

Reexamination Certificate

active

08085628

ABSTRACT:
A method and apparatus for controlling a focus servo of an optical disk drive is provided. The focus servo controlling method includes the operations of, when an operating mode enters into a focus pull-in mode, detecting a period of time that satisfies a first threshold condition, the first threshold condition set to determine a duration in which a focal point of an optical signal emitted from a pickup is passing through a cover layer of a disk, the determination made by using a first signal proportional to a detected portion of an optical signal reflected by the disk, and preventing focus servo control from being performed during a detected period of time that first satisfies the first threshold condition since the operating mode entered into the focus pull-in mode.

REFERENCES:
patent: 2005/0276199 (2005-12-01), Sugai
patent: 2006/0120229 (2006-06-01), Nabeta
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patent: 2003-051127 (2003-02-01), None
patent: 2005-310234 (2005-11-01), None
patent: 10-2003-0056086 (2001-12-01), None
patent: 10-2005-0066513 (2003-12-01), None
patent: 10-2005-0066513 (2005-06-01), None
Korean Office Action dated Sep. 23, 2008, issued in corresponding Korean Patent Application No. 10-2007-0100861.

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