| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing an optical element where the cooling rates of the center and the edge parts in a molten glass are uniformized, thus an optical element having an optical face with high precision can be produced at high productive efficiency. SOLUTION: A molding die is heated to a prescribed temperature, a molten glass is fed to a receiving face in the lower die, and the molten glass is subjected to press molding by the molding die, so as to form a molded body having a first optical face transferred with the molding face of the upper die. At this time, the shape of the receiving face of the lower die has been formed in such a manner that the edge parts in the obtained molded body are made thicker than the center thereof. Further, a second optical face is formed on the back side of the first optical face in the molded body by additional working. COPYRIGHT: (C)2008,JPO&INPIT
|
