| 摘要 |
PROBLEM TO BE SOLVED: To minimize an optical element without causing problems relating to handling in production and to positioning in a device. SOLUTION: The optical element is an integrated body having one and the other optical faces 1, 2. The optical element has a projected part 3 concentric to the optical axis formed within the effective diameter on one optical face 1 and has a flange 4 in the outside and peripheral part of the effective diameter on the other optical face 2. |
