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...

2005-03-17

2009-02-17

Group, Karl E (Department: 1793)

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

C501S050000, C501S079000

Reexamination Certificate

active

07491667

ABSTRACT:
Provided are optical glasses having a refractive index (nd) of over 1.82 but not more than 1.86 and an Abbe's number (νd) of 30 to 39.5 and having the property of low-temperature softening that permits precision press-molding, one is an optical glass comprising B2O3, La2O5, Gd2O3and ZnO as essential components, comprising Li2O and SiO2as optional components, provided that the content of SiO2is less than 2% by weight when Li2O is contained, having a refractive index (nd) of over 1.82 but not more than 1.86 and an Abbe's number (νd) of 30 to 39.5 and having a glass transition temperature (Tg) of 630° C. or lower, and the other is an optical glass comprising, by % by weight, 14 to 30% of B2O3, 10 to 40% of La2O3, 1 to 30% of Gd2O3and 6 to 26% of ZnO as essential components, and comprising, as optional components, predetermined amounts of WO3, Ta2O5, Nb2O5, TiO2, SiO2, Li2O, Na2O, K2O, MgO, CaO, SrO, BaO, Y2O3, Yb2O3, ZrO2, Bi2O3and Sb2O3and having a refractive index (nd) of over 1.82 but not more than 1.86, an Abbe's number (νd) of 30 to 39.5 and a glass transition temperature (Tg) of 630° C. or lower.

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1991 Data Book of Glass Composition, p. 106, published by Glass Manufacturers' Association of Japan (GMAJ), with English translation.

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