Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2009-01-16
2011-12-06
Chow, Van (Department: 2627)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
C369S044270
Reexamination Certificate
active
08072850
ABSTRACT:
A rewritable optical disk apparatus, optical information recording and reproducing apparatus or the like is allowed to automatically and properly adjust the optical system to the optimum focal condition regardless of the readout signal detector's positional error and the residual aberration in the optical system. The spherical aberration and defocus are coarsely adjusted using the amplitude (PP amplitude) of the tracking error signal and then finely adjusted using the amplitude (RF amplitude) of the readout signal. Since the spherical aberration can properly be adjusted, it is possible to raise the reliability of the readout signal.
REFERENCES:
patent: 5699330 (1997-12-01), Ogino et al.
patent: 6771584 (2004-08-01), Yamanaka
patent: 7277365 (2007-10-01), Yasuda et al.
patent: 7480216 (2009-01-01), Isshiki et al.
patent: 2002/0036958 (2002-03-01), Wada et al.
patent: 2002/0172110 (2002-11-01), Tateishi et al.
patent: 2003/0107961 (2003-06-01), Yasuda et al.
patent: 2004/0136281 (2004-07-01), Yanagisawa et al.
patent: 2004/0174781 (2004-09-01), Nishi
patent: 2004/0196766 (2004-10-01), Tadano
patent: 2005/0088930 (2005-04-01), Minechika et al.
patent: 2009/0129217 (2009-05-01), Isshiki et al.
patent: 2001-222838 (2001-08-01), None
patent: 2002-150569 (2002-05-01), None
patent: 2002-324328 (2002-11-01), None
patent: 2003-233917 (2003-08-01), None
patent: WO 02/073610 (2002-09-01), None
Japanese Office Action issued in corresponding Japanese Patent Application No. 2003-329296, dated Mar. 18, 2008.
Isshiki Fumio
Kurokawa Takahiro
Maeda Nobuyuki
Ohnishi Kunikazu
Shimano Takeshi
Antonelli, Terry Stout & Kraus, LLP.
Chow Van
Hitachi Media Electronics Co. Ltd.
LandOfFree
Optical information recording apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Optical information recording apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical information recording apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4296007