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:
Jul. 01, 2003
Filed:
Aug. 21, 2001
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
An optical head scans the information layer ( ) of an optical record carrier ( ) by means of a radiation beam ( ). Optical aberrations in the beam such as coma and spherical aberration, caused by tilt and thickness variations in the optical disc respectively, are compensated by an aberration compensator ( ) arranged in the radiation beam. The tilt or thickness variation is measured by a detector ( ) and used to control the aberration compensator. The radiation beam is focused onto the information layer by an objective system ( ). A displacement of the objective system in the transverse direction ( ) as used for radial tracking of the optical beam, causes a mismatch between the wavefront to be compensated and the wavefront introduced by the aberration compensator ( ). The mismatch is reduced by using a position detector ( ) for measuring the transverse position of the objective system and using the position signal ( ) as input for the control of the aberration compensator.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile