| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing method of a diffraction optical element capable of solving the problem in which since deformation and transfer of a lens substrate for molding is restricted by an embankment, there occurs transfer failure of a diffraction grating in an optical effective part in the vicinity of the embankment, in a step of using a mold having at an end part the embankment for controlling the height of a molding to mold the diffraction optical element with an optical resin for molding.SOLUTION: In a manufacturing method of a diffraction optical element that has a step of using a mold having an embankment for controlling the height of a molding outside an optical effective diameter to transfer the shape of the mold with an optical member for molding, the diffraction optical element is manufacture using the mold that has a groove whose cross-sectional shape is formed of obtuse angles between the embankment of the mold and the outermost part of an optical effective part, or whose cross-sectional shape is formed of a smoothly curved line. |
