Optical disk drive with spherical aberration measurement and...

Details Optical disk drive with spherical aberration measurement and... Optical disk drive with spherical aberration measurement and...

2007-08-30

2010-12-28

Young, Wayne R (Department: 2627)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S044230, C369S053310

Reexamination Certificate

active

07859967

ABSTRACT:
The invention relates to an optical disk drive. The optical disk drive has an objective lens to be driven by a focus actuator with a focus offset for focusing an incident beam onto an optical disk into a spot with a spherical aberration, and a processor to derive a first and a second characteristic from a sensor output signal and obtain a spherical aberration correction value (SA) from a pre-determined function, the pre-determined function defining a spherical aberration correction value in dependence on a focus offset difference value (ΔFO). The focus offset difference value (ΔFO) is determined from a difference between a second optimal focus offset at which the second characteristic is optimal and a first optimal focus offset at which the first characteristic is optimal. The spherical aberration correction value (SA) can be used to achieve a correction to the spherical aberration of the spot.

REFERENCES:
patent: 2007/0064558 (2007-03-01), Hoshi
patent: 2008/0056077 (2008-03-01), Miyaoka

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