| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical element, an optical system, a camera and a die for improving surface accuracy of a resin optical element manufactured by injection molding. SOLUTION: A resin optical element manufactured by injection molding has a rigidity variable region comprising a groove in the peripheral part of the optical face and out of the effective area of the optical face. The rigidity variable region has decreased rigidity in a direction of separating the optical element from a die, so that deformation by the frictional force caused by release stress between the inner periphery of the molding cavity and the outer periphery of the optical element in contact with the inner periphery is absorbed by the region to prevent deformation of the optical face. COPYRIGHT: (C)2008,JPO&INPIT |
