Zinc-containing optical glass materials
AssigneeSchott Glas
InventorsIna Mitra, Danuta Grabowski, Uwe Kolberg, Paul Kibl
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Abstract
Zinc-containing optical glass materials with a refractive index nd between 1.52 and 1.66, an Abbe number νd of between 35 54 and a composition (in % by weight based on oxide) of: SiO2 38-58, ZnO 0.3-42, PbO 0-<30, ZnO+PbO 20-55, Li2O 0-<3, Na2O 0-14, K2O 0-12, Li2O+Na2O+K2O≧2, F 0-3, MgO 0-6, CaO 0-<5, SrO 0-6, BaO 0-<0.9, B2O3 0-<1, Al2O3 0-<1.5 and ZrO2 0-<2 and, if appropriate, refining agents in the customary amounts.
Claims22
A zinc-containing optical glass with a refractive index (nd) being substantially in the range of from about 1.52 to about 1.66 and an Abbe number (νd) being substantially in the range of from about 35 to about 54, said zinc-containing optical glass substantially comprising, on an oxide basis, the composition of:
- 10 Percentage Material by weight SiO2 38-58 ZnO 0.3-42 PbO 0-<30 with ZnO + PbO 20-55 Li2O 0-<3 Na2O 0-14 K2O 0-12 with Li2O + Na2O + K2O ≧2 F 0-3 MgO 0-6 CaO 0-<5 SrO 0-6 BaO 0-<0.9 B2O3 0-<1 Al2O3 0-<1.5 ZrO2 0-<2.
A zinc-containing optical glass with a refractive index (nd) being substantially in the range of from about 1.57 to about 1.59 and an Abbe number (νd) being substantially in the range of from about 48 to about 52, said zinc-containing optical glass substantially comprising, on an oxide basis, the composition of:
- 14 Percentage Material by weight SiO2 41-50 ZnO 30-40 PbO 0-1 with ZnO + PbO 31-41 Li2O 0-<3 Na2O 0-11 K2O 0-10 with Li2O + Na2O + K2O ≧2 F 0-3 MgO 0-6 CaO 0-<5 SrO 0-6 BaO 0-<0.9 B2O3 0-<1 Al2O3 0-<1.5 ZrO2 0-<2.
A method of forming zinc-containing optical glass which consists of, on an oxide basis:
- 15 Percentage Material by weight SiO2 38-58 ZnO 0.3-42 PbO 0-<30 with ZnO + PbO 20-55 Li2O 0-<3 Na2O 0-14 K2O 0-12 with Li2O + Na2O + K2O ≧2 F 0-3 MgO 0-6 CaO 0-<5 SrO 0-6 BaO 0-<0.9 B2O3 0-<1 Al2O3 0-<1.5 ZrO2 0-<2
- said zinc-containing optical glass having a refractive index (nd) substantially in the range of from about 1.52 to about 1.66 and an Abbe number (νd) substantially in the range of from about 35 to about 54, said method including the steps of:
- (a) mixing and melting raw materials comprising said oxides to form a batch of glass;
- (b) heating a batch of glass obtained in accordance with step (a) to produce a melt of zinc-containing optical glass;
- (c) refining said melt obtained in accordance with step (b) with a at least one refining agent, said refining agent being added in an amount sufficient to refine said zinc-containing optical glass.
Dependencies are inferred from the claim text.