METHOD FOR DETERMINING THICKNESS OF GLASS RAW MATERIAL FOR PRECISION PRESS MOLDING, METHOD FOR MANUFACTURING GLASS RAW MATERIAL FOR PRECISION PRESS MOLDING, AND METHOD FOR MANUFACTURING GLASS OPTICAL ELEMENT

摘要

Disclosed is a method for determining the thickness of a glass raw material for precision press molding. Performing test press molding which performs press molding in such a manner that a glass raw material for test which consists of the same glass material as that of a glass molded body to be obtained by the precision press molding, has the same volume as that of the glass molded body, and the thickness of which is thicker than that of the glass molded body has the thickness of the glass molded body to be obtained, and creating an approximate straight line indicating the correlation between the thickness deformation amount and the deformation rate in the test press molding are implemented in at least two different types of press loads, thereby creating the at least two types of approximate straight lines, and determining the thickness of the glass raw material for the precision press molding to be in excess of the value after the value of a thickness deformation amount at the intersection of the created approximate straight lines is added to the thickness of the glass molded body to be obtained.