Press-molding glass material, method of manufacturing press-molding glass material, and method of manufacturing optical element

摘要

An aspect of the present invention relates to a press-molding glass material, which comprises a core part comprised of optical glass and a silicon oxide film of less than 15 nm in thickness covering at least a portion of the core part, the portion being to be an optically functional surface, as well as has a surface free energy as measured by a three-liquid method of equal to or lower than 75 mJ/m2. A further aspect of the present invention relates to a method of manufacturing a press-molding glass material comprising a core part comprised of optical glass and a silicon oxide film covering at least a portion of the core part to be an optically functional surface. The silicon oxide film is less than 15 nm in thickness, and film formation processing is conducted with a film-forming material comprised of SiO2 in an atmosphere with an oxygen content falling within a range of equal to or higher than 5 volume percent but less than 20 volume percent to form the silicon oxide film on the above portion of the core part.

主权项

1. A press-molding glass material, which comprises a core part comprised of optical glass and a silicon oxide film of less than 15 nm in thickness covering at least a portion of the core part, the portion being to be an optically functional surface, as well as has a surface free energy that is given by the sum of a nonpolar component and a hydrogen bond component and a dipolar component as measured by a three-liquid method of equal to or lower than 75 mJ/m2.