METHOD OF MANUFACTURING OPTICAL ELEMENT

摘要

Disclosed is a method of manufacturing an optical element capable of increasing surface accuracy of an optical surface of an optical element with a plastic lens portion. A cavity which is formed when a pair of molds are closed has a compression molding space and an annular injection molding space, and the method includes a compression molding step of casting a compression molding material into the compression molding space of the molds and an injection molding step of injecting an injection molding material into the injection molding space in a state where the molds are closed and forming an injection molded portion at the outer circumferential edge of the compression molded compression molding material. In the injection molding step, before the compression molding material reaches a temperature lower than the glass transition temperature, the injection of the injection molding material starts.

主权项

1. A method of manufacturing an optical element which obtains an optical element with a plastic lens portion by molding machining using a pair of molds,
wherein a cavity which is formed when the pair of molds are closed has a compression molding space and an annular injection molding space connected to the outer circumferential edge of the compression molding space, the method comprises: a compression molding step of casting a compression molding material into the compression molding space of the molds and closing the molds in an atmosphere equal to or higher than the glass transition temperature of the compression molding material to transfer the transfer surfaces of the molds to the compression molding material; and an injection molding step of injecting an injection molding material into the injection molding space in a state where the molds are closed and forming an injection molded portion at the outer circumferential edge of the compression molded compression molding material, and in the injection molding step, before the compression molding material reaches a temperature lower than the glass transition temperature, the injection of the injection molding material starts.