Optical glass

Details Optical glass Optical glass

2008-01-22

2008-01-22

Lorengo, J. A. (Department: 1755)

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

C501S078000, C501S901000

Reexamination Certificate

active

10859022

ABSTRACT:
An optical glass suitable for precision mold pressing has a refractive index (nd) of 1.88 or over and an Abbe number (ν d) within a range from 22 to 28, comprises, in mass %,SiO215-25% B2O30-5% La2O30-5% TiO25-15%ZrO20-10%Nb2O5more than 30%andless than 50%WO30-5% CaO0-10%BaO0-10%Li2O3-12%Na2O0-10%K2O0-10%Bi2O30-15%Ta2O50-7% and has a glass transition point (Tg) within a range from 500° C. to 580° C. The optical glass preferably has a yield point (At) within a range from 550° C. to 640° C.

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patent: 19919802 (1999-11-01), None

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