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:
Dec. 07, 2010
Filed:
Dec. 01, 2005
Roel Johannes Elisabeth Merry, Eindhoven, NL;
Martin Leist, Giessen, DE;
Marcel Rieck, Friedberg, DE;
Roel Johannes Elisabeth Merry, Eindhoven, NL;
Martin Leist, Giessen, DE;
Marcel Rieck, Friedberg, DE;
Philips & Lite-On Digital Solutions Corporation, Taipei, TW;
Abstract
A signal-processing device () for controlling a focus actuator () in an optical disc system (), wherein the signal processing device () generates a focus actuator control signal (CS) to be supplied to the focus actuator (). The focus actuator control signal (CS) is based on a focus error signal (FE) and a central aperture signal (CA). If the central aperture signal (CA) is equal to or above a certain threshold value the focus actuator control signal will correspond to the focus error signal (FE). However, when the central aperture signal is below the threshold value the focus actuator control signal will have a predefined level. By providing a focus actuator control signal (CS) in accordance herewith it is possible to extend the regions of the focus error signal (FE) in which the relative distance between the focus point and the data layer of the record medium () is not correctly represented. The provision of the control signal (CS) enables improvements of the start-up and recovery performance of optical disc systems, especially under vibrating conditions.