| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical pickup equipped with an objective lens having the low spherical aberration, of which the optical use efficiency is high. SOLUTION: An optical passage area of a shell facing disks 30a and 30b is divided by a central area and circumscription area corresponding to each of a paraxial area and an area far from the optical axis of incident light, and a staging area located between the paraxial area and the area, an objective lens 20 having a surface on which the light passing through the central area and the staging area to the thick disk 30b is converged, and the light passing through the central area and the circumscription area to the thin disk 30a is converged, is equipped. |
