Diffractive optical lens, a mold for making the lens, and a method for making the mold

摘要

A diffractive optical lens ( 1 ) includes a lower surface ( 10 ) and an upper surface ( 12 ). The lower surface ( 10 ) has an aspheric curvature. The upper surface ( 12 ) has a quasi-parabolic curvature. A plurality of diffractive stripes ( 220 ) is formed on the upper surface ( 12 ). A mold ( 2 ) for making the diffractive optical lens ( 1 ) includes a lower core insert ( 20 ) and an upper core insert ( 22 ). The low core insert ( 20 ) has an aspheric surface ( 200 ). The upper core insert ( 22 ) has a surface configured for forming the upper surface ( 200 ) of the diffractive optical lens ( 1 ). A method for making the mold ( 2 ) is also provided.