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:
Jun. 16, 2009
Filed:
May. 12, 2004
Hendrik Josephus Goossens, Shanghai, CN;
Frank Cornelis Penning, Turnhout, BE;
Hendrik Josephus Goossens, Shanghai, CN;
Frank Cornelis Penning, Turnhout, BE;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
An apparatus for scanning a track on a record carrier has a head () for providing a beam of radiation and generating at least one sensor signal. The device has a focusing unit for controlling a focusing element to maintain an in-focus position for generating a focused spot on the track. The sensor signal is converted into a displacement signal by a multitude of piecewise converters (), each converter converting a range of the sensor signal values into a position signal, and selection means () for selecting one of the position signals as the displacement signal based on an estimated displacement.