| 摘要 |
PROBLEM TO BE SOLVED: To make a molding die that can mold a lens of a desired shape after few times of correction and to provide a method for producing a molding by using the molding die. SOLUTION: The method is one for obtaining a molding having a first surface including a concave shape and a second surface including a convex shape comprising press-molding a thermally softened molding material by using a first molding surface including the convex shape and a second molding surface including the concave shape. In one embodiment, the method comprises a first molding step of press-molding a thermally softened molding material by using a primary molding die to obtain a temporary molding, a step of grasping shrinkage rates of the first and second molding surfaces of the temporary molding from the difference between the shape of the temporary molding and the shape of the molding surface of the primary molding die, the secondary molding die preparation step of determining the shape of the molding surface of a secondary molding die for obtaining a desired molding according to the determined shrinkage rates and preparing a secondary molding die according to the determined shape, and the second molding step of press-molding the molding material by using the secondary molding die to obtain the final molding. COPYRIGHT: (C)2006,JPO&NCIPI |
