| 摘要 |
Optical glass with refractive indicies>/=1.90, Abbe numbers>/=25 consisting essentially of, in weight percent; 0-10 SiO2, 2-20 B2O3, 0-2 Al2O3, the sum of SiO2, B2O3, and Al2O3 being 7.5-25, 1-16 TiO2, 0-10 ZrO2, 35-55 La2O3, 0.5-10 Y2O5, 0.5-15 Nb2O5, 0-10 Gd2O3, 0-15 Ta2O5, 0-3 P2O5 wherein the ratio of SiO2 to B2O3 is between 0.1 and 1.6, and the sum of Nb2O5 and Ta2O5 is from 9 to 20%.
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