MOLD AND METHOD FOR MOLDING OPTICAL ELEMENT, AND OPTICAL ELEMENT

摘要

PROBLEM TO BE SOLVED: To prevent the deterioration of optical capacity caused by the deformation of an optical element at the time of mold release. SOLUTION: An ejector sleeve 11 arranged around a movable mold piece is precisely slid with respect to both of the movable mold piece 3 and a movable template 5 and the end part contact surface 13 coming into contact with the diffraction optical function surface of a diffraction optical element other than a part of a runner and a gate, the longitudinal contact surface coming into contact with the end surface in the longitudinal direction of the diffraction optical element and the short-direction contact surface coming into contact with the end surface in the short direction thereof are formed to the ejector sleeve 11. The longitudinal end surface 14 restricts the longitudinal elongation of the diffraction optical element at the time of mold release.