GLASS PREFORM FOR PRESS FORMING, METHOD FOR PRODUCING THE SAME, AND METHOD FOR PRODUCING OPTICAL ELEMENT

摘要

PROBLEM TO BE SOLVED: To provide a glass preform for press forming from which a high-quality glass optical element can be obtained by precision press forming.

SOLUTION: The glass preform for press forming has a core part comprising optical glass and a silicon oxide film of <15 nm thickness covering at least a portion of the core part serving as an optically functional surface, and a surface free energy of the glass preform measured by a three-liquid method is≤75 mJ/m2. There is also provided a method for producing a glass preform for press forming having a core part comprising optical glass and a silicon oxide film of <15 nm thickness covering at least a portion of the core part serving as an optically functional surface, wherein the silicon oxide film is formed on the portion of the core part by film deposition processing using a film deposition material comprising SiO2in a mixed gas atmosphere of an inert gas and oxygen having an oxygen content of 5 to <20 vol.%.

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