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:
Sep. 06, 2011
Filed:
Jun. 23, 2006
Jeroen Arnoldus Leonardus Johannes Raaymakers, Eindhoven, NL;
Jeroen Arnoldus Leonardus Johannes Raaymakers, Eindhoven, NL;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
The present invention relates to a method for operating an optical drive system () capable of reproducing/recording information from/to an optical carrier (), wherein the optical drive system includes a focus controller (PID) for controlling a focus actuator (), and a focus memory loop (ML) for applying a stored correction signal to the focus actuator (). The method aims at avoiding impacts between the focussing means () and the optical carrier (), by gradually stopping the focus control loop in response to an event, such as a user initiated ejection of the optical carrier. The gradual stop of the focus control loop is achieved by gradually reducing a memory loop parameter of the focus memory loop (ML), and by gradually reducing a controller parameter of an integrating part (I) of the focus controller (PID). It is an advantage of the invention that the phase of the stored correction signal is synchronized with the angular position of optical carrier () during the gradual stopping.