| 摘要 |
PROBLEM TO BE SOLVED: To simplify the assembly and adjustment of lenses of a pickup having the lenses for each of disks having different substrate thicknesses. SOLUTION: The integrally molded lens having the same positional relation of the respective lens faces with the mounting faces is manufactured by integrally molding the lens parts consisting of the lens faces 3, 5, the lens parts consisting of the lens faces 4, 6, the mounting surface 2a for the lens faces 3, 4 and the mounting surface la for the lens faces 5, 6. The shapes of the lens faces 3, 4, 5, 6 are so designed that the lenses optimized for the disks of the substrate thicknesses varying in the lens parts formed by these lens faces are obtd. |
