Objective lens inclinable to correct for a third-order coma...

G - Physics – 11 – B

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G11B 7/135 (2006.01) G02B 13/00 (2006.01) G02B 27/00 (2006.01) G11B 7/09 (2006.01) G11B 7/095 (2006.01) G11B 7/125 (2006.01)

Patent

CA 2345788

An objective (1) for optical disks for focusing the beam of light from a light source. The third-order comatic aberration of the objective of when an optical disk (2) inclines at a unit angle is larger than that of when the objective inclines at a unit angle. The objective is mounted on an actuator that inclines the objective according to the inclination of the optical disk. Therefore the numerical aperture of the objective is large. The manufacture and assembly of the objective are facilitated. The third-order comatic aberration caused when the optical disk inclines because of its warp can be corrected by inclining the objective, thereby decreasing the residual astigmatism after the correction.

L'invention concerne un objectif (1) destiné à des disques optiques pour la mise au point du faisceau de lumière provenant d'une source lumineuse. L'aberration de coma de troisième ordre de l'objectif survenant lorsqu'un disque optique (2) est incliné selon un angle d'unité, est supérieure à celle survenant lorsque l'objectif est incliné selon un angle d'unité. L'objectif est monté sur une commande qui incline l'objectif selon l'inclinaison du disque optique. L'ouverture numérique de l'objectif est importante. La fabrication et l'assemblage de l'objectif sont facilités. L'aberration de coma de troisième ordre survenant lorsque le disque optique s'incline du fait de son gauchissement peut, par ailleurs, être corrigée par inclinaison de l'objectif, ce qui diminue l'astigmatisme résiduel après correction.

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