Optical glass

Details Optical glass Optical glass

2008-04-02

2011-11-08

Group, Karl (Department: 1731)

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

C501S049000, C501S051000

Reexamination Certificate

active

08053384

ABSTRACT:
A glass composition being suitable for precision mold press forming, having superior resistance to devitrification, having optical constants (a refractive index, an Abbe number, and the like) required for aspherical lenses, and a low glass transition temperature. There is provided an optical glass comprising no less than 5 mol % and no more than 60 mol % of a B2O3component, and no less than 0.2 mol % and no more than 60 mol % of a TeO2component, by mol % on the basis of oxides. Further, there is provided an optical glass mentioned above having optical constants with a refractive index (nd) of 1.80 to 2.20, and an Abbe number (νd) of 16 to 40. Still further, there is provided an optical glass mentioned above having a glass transition temperature (Tg) of no more than 680° C.

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