| 摘要 |
PROBLEM TO BE SOLVED: To provide an objective lens having a mark for aberration reference and facilitating attitude detection of the objective lens and an optical pickup device using the same.SOLUTION: There is no need to provide a mark on a mirror surface section EM since a mark MK for aberration reference is formed on a non-mirror surface F1 shifted more to a side going away from a first optical surface S1 than the mirror surface section EM. In addition, a spot image on an automatic collimator DET is smaller since the mirror surface section EM is in a completely annular shape and attitude detection of an objective lens OBJ can be carried out at high accuracy. Furthermore, processing of a metal mold for molding the objective lens OBJ becomes easier by providing the non-mirror surface F1. |
