Optical disk drive with spherical aberration measurement and method of measuring spherical aberration in an optical disk drive
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Dec 28, 2010
Grant Date -
Mar 5, 2009
app pub date -
Aug 30, 2007
filing date -
Aug 30, 2007
priority date (Note) -
Expired
status (Latency Note)
Importance
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 (.DELTA.FO). The focus offset difference value (.DELTA.FO) 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.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully