| 摘要 |
Zinc-containing optical glass materials with a refractive index n<SUB>d </SUB>between 1.52 and 1.66, an Abbe number nu<SUB>d </SUB>of between 35 and 54 and a composition (in % by weight based on oxide) of: SiO<SUB>2 </SUB>38-58, ZnO 0.3-42, PbO 0-<30, ZnO+PbO 20-55, Li<SUB>2</SUB>O 0-<3, NA<SUB>2</SUB>O 0-14, K<SUB>2</SUB>O 0-12, Li<SUB>2</SUB>O+Na<SUB>2</SUB>O+K<SUB>2</SUB>O >=2, F 0-3, MgO 0-6, CaO 0-<5, SrO 0-6, BaO 0-<0.9, B<SUB>2</SUB>O<SUB>3 </SUB>0-<1, AL<SUB>2</SUB>O<SUB>3 </SUB>0-<1.5 AND ZRO<SUB>2 </SUB>0-<2 and, if appropriate, refining agents in the customary amounts.
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