OPTICAL ELEMENT

摘要

PROBLEM TO BE SOLVED: To provide an optical element which needs no new manufacturing process and which can detect required and sufficient reflected light from a part of an exterior surface of the optical element after molding.

SOLUTION: The optical element 1 is provided with an optical effective section 1a and a frame section 1b adjoining this. The frame section 1b is at least equipped with a 1st flat surface section and a 2nd flat surface section having different surface roughness with each other at least on one face of the optical element.

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