MOLD FOR GLASS OPTICAL ELEMENT BLANK FOR POLISHING, AND METHODS FOR PRODUCING GLASS OPTICAL ELEMENT BLANK FOR POLISHING AND OPTICAL ELEMENT

摘要

[Problem] The objective of the present invention is to provide a mold which is used to produce a glass optical element blank for polishing by press-molding a softened glass material in an air ambient and which has excellent durability and long life. [Solution] A mold according to the present invention is a mold which has at least an upper die and a lower die and is used to produce a glass optical element blank for polishing by press-molding a softened glass material in an air ambient, wherein a molding surface of at least one of the upper die and the lower die has an oxide ceramic film with a thickness of 5 μm or more.