Optical glass
AssigneeHoya Corporation
InventorKoichi Sato
Life of this patent
Estimating the term…
Abstract
Optical glasses and optical articles comprised of the optical glass are disclosed. One of which comprises, by means of weight percentages, more than 32 percent and not more than 45 percent P2O5, more than 0.5 percent and not more than 6 percent Li2O, more than 5 percent and not more than 22 percent Na2O, 6-30 percent Nb2O5, 0.5-10 percent B2O3, 0-35 percent WO3, 0-14 percent K2O, and 10-24 percent Na2O+K2O, and the total of all the above components is not less than 80 percent.
Claims41
A press-molding glass preform comprised of an optical glass comprising, by means of weight percentages, more than 32 percent and not more than 45 percent P2O5, more than 0.5 percent and not more than 6 percent Li2O, more than 5 percent and not more than 22 percent Na2O, 6-30 percent Nb2O5, 0.5-10 percent B2O3, 0-35 percent WO3, 0-14 percent K2O, and 10-24 percent Na2O+K2O, wherein the sum of the oxides of P, Li, Na, Nb, B, W, and K is not less than 80 percent, and wherein the optical glass does not comprise PbO.
A press-molding glass preform comprised of an optical glass comprised of phosphate glass which comprises, by means of weight percentages, more than 0.5 percent and but not more than 6 percent Li2O, more than 5 percent but not more than 22 percent Na2O, 0-14 percent K2O, 10-24 percent Na2O+K2O, 6-30 percent Nb2O5, and not more than 45 percent P2O5, and exhibits a refractive index (nd) of 1.64-1.72, an Abbé number (vd) of 29-36, and a sag temperature (Ts) of not greater than 520° C. wherein the optical glass does not comprise PbO.
A press-molding glass preform comprised of an optical glass comprised of phosphate glass which comprises, by means of weight percentages, more than 0.5 percent but not more than 6 percent Li2O, more than 5 percent but not more than 22 percent Na2O, 0-14 percent K2O, 10-24 percent Na2O+K2O, 6-30 percent Nb2O5, 0-35 percent WO3, 0-5 percent Al2O3, and from 0 percent to less than 8 percent TiO2, and exhibits a refractive index (nd) of 1.64-1.72, an Abbé number (vd) of 29-36, and an sag temperature (Ts) of not greater than 520° C., wherein the optical glass does not comprise PbO.
A press-molding glass preform comprised of an optical glass comprising, by means of weight percentages, more than 32 percent but not more than 45 percent P2O5, more than 0.5 percent but not more than 6 percent Li2O, more than 5 percent but not more than 22 percent Na2O, 6-30 percent Nb2O5, 0.5-10 percent B2O3, 0-35 percent WO3, 0-14 percent K2O, 10-24 percent Na2O+K2O, 0-2 percent SiO2, 0-5 percent Al2O3, from 0 percent to less than 8 percent TiO2, 0-15 percent ZnO, 0-12 percent BaO, from 0 percent to less than 1 percent Sb2O3, and 0-1 percent SnO2, where the sum of the oxides of P, Li, Na, Nb, B, W, K, Si, Al, Ti, Zn, Ba, Sb, and Sn is not less than 95 percent, the refractive index (nd) is 1.64-1.72, the Abbé number (vd) is 29-36, and the sag temperature (Ts) is not more than 520° C. and wherein the optical glass does not comprise PbO.
A press-molding glass preform comprised of an optical glass comprised of phosphate glass which comprises Li2O, Na2O, Nb2O5, and B2O3 as essential components, and not more than 2 weight percent SiO2 an optional component, with a refractive index (nd) of 1.64-1.72, an Abbé number (vd) of 29-36, a sag temperature (Ts) of not more than 520° C., and a liquidus temperature (LT) of not more than 900° C., wherein the optical glass does not comprise PbO.
Dependencies are inferred from the claim text.