| 摘要 |
PROBLEM TO BE SOLVED: To provide a molding die for enabling the manufacture of a highly precise glass optical element having excellent optical performance with high productive efficiency by a precision mold press. SOLUTION: In the molding die 10 for molding the glass optical element provided with a substrate part 1 consisting of a sintered body and a molding surface part 2 formed by a chemical vapor deposition method and having a molding surface 2a for molding the glass optical element, and in the molding surface part 2, an average crystal grain size at a molding surface 2a side part is smaller than an average crystal grain size at a joint surface side part to the substrate part 1. A dense and high precision molding surface can be formed since the molding surface is formed at the part where the average crystal grain size is relatively small. Bond strength with the substrate part 1 can be raised since the part where the average crystal grain size is relatively large is a joint surface to the substrate part 1. COPYRIGHT: (C)2008,JPO&INPIT
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