Objective lens for optical disk, optical head device and...

G - Physics – 02 – B

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G02B 13/00 (2006.01) B24B 19/20 (2006.01) C03B 11/08 (2006.01) G01B 21/20 (2006.01) G02B 13/18 (2006.01) G11B 7/135 (2006.01) G11B 7/00 (2006.01) G11B 7/125 (2006.01)

Patent

CA 2341681

An objective for an optical disk constituted of a single lens and exhibiting a good light focusing characteristic corresponding to either of the two types of optical disk having different substrate thicknesses. An objective (2) is made up of a single bi-aspherical lens. The face (3) on the light source side is a rotationally-symmetric aspherical surface; the face on the optical disk (6) side is divided into an inner area (4) and an outer area (5). Along the boundary between the inner and outer areas (4, 5), a step (7) the height of which is about 0.3 µm is provided parallel with the optical axis (along the optical axis). The spherical aberration of the objective (2) is corrected by the inner and outer areas (4, 5) correspondingly to an optical disk of any of two types having different substrate thickness.

L'invention concerne un objectif pour disque optique constitué d'une seule lentille et présentant de bonnes caractéristiques de focalisation de la lumière correspondant à l'un des deux types de disque optique présentant différentes épaisseurs de substrat. Un objectif (2) est composé d'une seule lentille bi-asphérique. La face (3) se trouvant du côté source de lumière est une surface asymétrique à symétrie de rotation, la face du côté disque optique (6) est divisée en une zone intérieure (4) et une zone extérieure (5). Le long de la limite située entre les zones intérieure et extérieure (4, 5), un gradin (7) dont la hauteur est d'environ 0,3 µm est ménagé parallèlement à l'axe optique (le long de l'axe optique). Les aberrations sphériques de l'objectif (2) sont corrigées par les zones intérieure et extérieure (4, 5) en fonction d'un disque optique de n'importe lequel des deux types ayant différentes épaisseurs de substrat.

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