摘要 |
PROBLEM TO BE SOLVED: To provide an optical element which has a compact constitution, enables center position accuracy of an optical functional face thereof to be measured easily and properly, and enables a metallic mold to be corrected according to the measurement result of the center position accuracy of the optical functional face , so that an optical element that is superior in optical performance can be manufactured. SOLUTION: The optical element is formed with marks 19, 20, and 21 for measuring deviations between the center of a flange 14 and the center of the optical functional face 3, in at least two areas on the concentric circles of a first end face 15, such that a pair of them are in opposite positional relation with an imaginary straight line between them, the imaginary straight line being disposed, so as to pass through the widthwise center of the projecting face of an internal side gate formed part 17 projected on the same flat face of the first end face 15 and extend in the direction of the normal of the outer circumferential surface 14a of the flange 14. COPYRIGHT: (C)2008,JPO&INPIT
|