Objective lens and optical pickup apparatus

Details Objective lens and optical pickup apparatus Objective lens and optical pickup apparatus

G - Physics

11

B

G11B 7/135 (2006.01) G02B 5/18 (2006.01) G11B 7/125 (2006.01) G11B 7/00 (2006.01)

Patent

CA 2427411

In an objective lens for use in an optical pickup device, when NA1 and N2 (NA2 < NA1) represent a needed numerical aperture of the objective lens on an image side, a first spot and a second spot represent a spot formed by the light flux having passed through the central region, a mth order diffracted ray and a nth diffracted ray represent a diffracted ray having the maximum diffraction efficiency among diffracted rays, the central region nearly corresponds to a region through which the light flux in the inside of the numerical aperture NA2 passes, the light amount of the nth order diffracted ray which reaches the inside of the second spot is less than that of the mth order diffracted ray which reaches the inside of the first spot, and the mth order diffracted ray and the nth order diffracted ray satisfy the relationship of m = n.

Selon la présente invention, dans une lentille d'objectif destinée à être utilisée dans un dispositif de prise de vue optique, lorsque NA1 et NA2 (NA2 < NA1) représentent une ouverture numérique requise de la lentille d'objectif sur un côté d'image, une première tache et une seconde tache représentent une tache formée par le flux lumineux qui a traversé la zone centrale, un rayon diffracté d'ordre m et un rayon diffracté d'ordre n représentent un rayon diffracté ayant une capacité de diffraction maximale parmi les rayons diffractés, la zone centrale correspond approximativement à la zone à travers laquelle le flux lumineux passe à l'intérieur de l'ouverture numérique NA2, la quantité de lumière du rayon diffracté d'ordre n qui atteint l'intérieur de la seconde tache est inférieure à la quantité de lumière du rayon diffracté d'ordre m qui atteint l'intérieur de la première tache, et le rayon diffracté d'ordre m et le rayon diffracté d'ordre n vérifient la relation m = n.

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