Lens device and an optical pickup apparatus using the lens...

G - Physics – 02 – B

Patent

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G02B 7/28 (2006.01) B29D 11/00 (2006.01) G11B 7/00 (2006.01) G11B 7/135 (2006.01) G11B 7/18 (2006.01)

Patent

CA 2202288

A lens device which can be used as an objective lens in an optical pickup apparatus includes an objective lens (200) provided along a light path facing a disc (300a or 300b) and having a predetermined effective diameter, and light controlling means (100) provided along the light path for controlling the light in an intermediate region between near and far axes of an incident light beam (400), thus providing a simplified and inexpensive device for using discs of differing thickness in a single disc drive, by reducing the spherical aberration effect.

Dispositif à lentille qu'on peut utiliser en tant qu'objectif dans un capteur optique et qui comprend un objectif (200) situé le long d'un trajet de lumière opposé à un disque (300a ou 300b) et possédant un diamètre prédéterminé, ainsi que des moyens de régulation de lumière (100) situés le long du trajet de lumière afin de réguler la lumière dans une zone intermédiaire entre les axes proche et lointain d'un faisceau lumineux incident (400), ce qui constitue un dispositif économique et simplifié permettant d'utiliser des disques d'épaisseurs différentes dans une seule unité de disques, par diminution de l'effet d'aberration sphérique.

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