| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method to prepare at a low cost and stably a closeness shape of an optical device molded body or a preform of a highly precise optical device molded article which carries out preform development by performing a continuous stable molding from a molten glass flow in the atmospheric air. Ž<P>SOLUTION: The method of producing a preform of an optical device comprises: a process which supplies molten glass into a molding mold; a process which pressure molds the supplied molten glass with a molding mold; and a process which demolds the molded molten glass from the molding mold. The molding mold at least contains boron nitride, and the temperature of a mold surface of the molding mold is made to be in a range of 400°C or higher and 720°C or lower in the process which pressure molds and the process which demolds. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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