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:
Feb. 03, 2009
Filed:
Nov. 04, 2003
Jeroen Arnoldus Leonardus Johannes Raaymakers, Eindhoven, NL;
Jeroen Arnoldus Leonardus Johannes Raaymakers, Eindhoven, NL;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
An apparatus for scanning a track on a record carrier has a head for scanning the track and generating a read signal. The tilt between the head and the record carrier () is compensated via a tilt servo loop. Thereto the head is provided with tilt compensating actuators (). A measure of the tilt is jitter in the read signal generated by a front end () and filter (). A wobble generator () provides a wobble signal to the actuators and to an input of multiplier () for synchronous detection of the jitter. The output of the multiplier () is coupled to a low pass filter () for generating a tilt error signal coupled to a tilt controller () for generating a tilt control signal.