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. 27, 2007
Filed:
Sep. 18, 2003
Bernardus Hendrikus Wilhelmus Hendriks, Eindhoven, NL;
Mathijs DE Jongh, Eindhoven, NL;
Willem Marie Julia Marcel Coene, Eindhoven, NL;
Coen Theodorus Hubertus Fransiscus Liedenbaum, Eindhoven, NL;
Bernardus Hendrikus wilhelmus Hendriks, Eindhoven, NL;
Mathijs De Jongh, Eindhoven, NL;
Willem Marie Julia Marcel Coene, Eindhoven, NL;
Coen Theodorus Hubertus Fransiscus Liedenbaum, Eindhoven, NL;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
An optical scanning device for scanning an optical record carrier comprising an information layer. Crosstalk cancellation is provided using a phase modulating element () for generating a non-rotationally-symmetric phase profile in a subsidiary radiation beam. The phase profile varies with an azimuthal angle measured about the optical axis of the beam portion, the phase profile varying such that successively different phases are introduced in at least five locations which are each at successive azimuthal angles (φ, φ, φ) and each at a given radial distance from the optical axis, wherein the phase profile is such that the phases introduced, when taken in modulo 2π form, successively cycle through 0 to 2π at least twice, whereby the subsidiary beam spot is provided with an intensity distribution on the information layer which overlaps that of the side-lobe of the main beam spot.