| 摘要 |
PROBLEM TO BE SOLVED: To obtain a high strength and high precise molding surface and to provide a molding die hardly causing fusion reaction with a glass of a molding base material by applying successively specific two layers on the surface of the die base material composed of silicon carbide sintered compact in the press molding die of an optical device. SOLUTION: This molding die 1 is formed by applying silicon carbide as an intermediate layer 1b on the die base material 1a and applying boron carbide (B4 C) as the outermost layer 1c on the intermediate layer 1b. The surface roughness Rmax of the intermediate layer 1b is preferably <=5mm. The thickness of the outermost layer 1c is preferably <=0.2μm. The intermediate layer 1b is preferably one formed by CVD method.
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