Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2008-05-07
2010-12-21
Pardo, Thuy N (Department: 2627)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
C369S044180, C369S044290, C369S047280, C369S053170, C369S053230
Reexamination Certificate
active
07855941
ABSTRACT:
An optical disk as disclosed herein includes, among other things, a summing module that sums a compensation signal to a predetermined signal in a servo loop. The compensation signal compensates for a periodical disturbance input into a servo system of the optical disk device in units of a rotation angle of the disk rotating module. A phase lead imparting module imparts a predetermined amount of phase lead to an output signal from an optical detector module and outputs the predetermined amount of phase lead as the compensation signal. The predetermined amount of phase lead is determined in accordance with the rotation period information. The optical disk device performs an accurate iterative learning control to provide stable servo performance. The iterative learning control is performed such that the signal having imparted an optimal amount of phase lead in accordance with the rotation period information is added to the servo loop.
REFERENCES:
patent: 6307822 (2001-10-01), Shim et al.
patent: 6813227 (2004-11-01), Cho et al.
patent: 2002/0131339 (2002-09-01), Kadlec et al.
patent: 2003/0031100 (2003-02-01), Kadlec et al.
patent: 2003/0133220 (2003-07-01), Hsin
patent: 2006/0291345 (2006-12-01), Cheng
patent: 2007/0002711 (2007-01-01), Cheng
patent: 2007/0091747 (2007-04-01), Ueno
patent: 2008/0165648 (2008-07-01), Jeong et al.
patent: 2002-140876 (2002-05-01), None
Hitachi , Ltd.
Pardo Thuy N
Townsend and Townsend / and Crew LLP
LandOfFree
Optical disk device 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 disk device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical disk device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4158900