The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 15, 2011
Filed:
Jun. 18, 2008
Johannes Leopoldus Bakx, Eindhoven, NL;
Antoon Dekker, Eindhoven, NL;
Maarten Kuijper, Helmond, NL;
Tony P. Van Endert, Lommel, BE;
Johannes Leopoldus Bakx, Eindhoven, NL;
Antoon Dekker, Eindhoven, NL;
Maarten Kuijper, Helmond, NL;
Tony P. van Endert, Lommel, BE;
Lite-On It Corporation, Taipei, TW;
Abstract
An optical disk drive and a method for scanning an optical disk that includes a substantially circular track with a scanning velocity is provided. A servo control signal (SCS) is determined based on a servo error signal (SES). A first performance indicator (IND) of the servo actuator is determined from at least one of the SES and SCS. INDis compared against a first pre-determined threshold (ITHR), determining a first servo margin (MAR). The scanning velocity is set in dependence on at least MAR. In particular, scanning velocity is reduced when the first performance indicator exceeds the first pre-determined threshold. Additionally or alternatively, a bandwidth of control of the servo actuator can be adjusted in dependence on at least one of a second servo margin, determined from at least one of SES and SCS, and a third servo margin, associated with a mark quality determined from a central aperture signal.