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:
Oct. 21, 2008
Filed:
Jun. 30, 2005
Herman Van Der Kall, Eindhoven, NL;
Joop Van Bijnen, Eindhoven, NL;
Herman Van Der Kall, Eindhoven, NL;
Joop Van Bijnen, Eindhoven, NL;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
In an optical disc drive, adapted for forming a label on the label sideof a recordable optical disc, a determination of the rotation angle a is provided, so that the marking of the label sidecan be synchronized upon. The method to determine the rotation angle a is based upon one or two of the signals' generated by the Hall-effect elementswhich are normally present in an optical disc drive and are used to generate the tacho signal. Advantageously, the actual relationship between rotation angle a and the amplitude of these signals is recorded in a calibration procedure, so as to allow for a higher precision of the rotation angle a determined. This calibration procedure may be performed in the factory or by the user, and may not require any additional ad-hoc equipment if a synchronization pattern present in an optical disc is used.