Method and apparatus for generating focus error signals in a...

G - Physics – 11 – B

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G11B 7/14 (2006.01) G11B 7/09 (2006.01) G11B 7/13 (2006.01) G11B 7/135 (2006.01)

Patent

CA 2345139

A focus detection system for use in a multi-beam optical pickup assembly is provided that uses an optical element (44), either a holographic element or diffractive element, to split beams reflected off of a data-bearing surface of an optical disk (100) into a plurality of data beams and a plurality of focus beams. The optical element also introduces astigmatism into the focus beams. The focus beams are projected onto focus detectors configured to account for overlap between adjacent focus beams to produce an accurate focus error signal.

L'invention concerne un système de détection de focalisation, utile dans un ensemble lecteur optique à plusieurs faisceaux mettant en oeuvre un élément optique (44), soit un élément holographique, soit un élément à diffraction, afin de diviser les faisceaux réfléchis à partir d'une surface porteuse de données d'un disque optique (100) en plusieurs faisceaux de données et en plusieurs faisceaux de focalisation. L'élément optique introduit également un astigmatisme dans les faisceaux de focalisation, lesquels sont projetés sur des détecteurs de focalisation, conçus pour prendre en compte le chevauchement entre faisceaux de focalisation adjacents, afin de produire un signal précis d'erreur de focalisation.

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