Optical glass, precision press-molding preform, process for...

Details Optical glass, precision press-molding preform, process for... Optical glass, precision press-molding preform, process for...

2011-04-26

2011-04-26

Group, Karl E (Department: 1731)

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

C501S051000, C501S078000, C501S079000

Reexamination Certificate

active

07932197

ABSTRACT:
Provided is an optical glass having high-refractivity low-dispersion properties, having a low glass transition temperature and having the property of being softened at a low temperature so that a preform therefrom is precision press-moldable, and the optical glass comprises, as essential components, B2O3, La2O3, Gd2O3and ZnO and has a refractive index (nd) of over 1.86, an Abbe's number (νd) of less than 35 and a glass transition temperature (Tg) of 630° C. or lower.

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Calculations of Physical Properties of Oxide Glasses, pp. 189-191 (and English translation).

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