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US 2014/0228197 A1Published application
Optical Glass
AssigneeKonica Minolta, Inc.
InventorAkio Oogaki
Life of this patent
Estimating the term…
Abstract
This optical glass contains, as represented by mol %, 18 to 38% P2O5, 0 to 15% B2O3, 23 to 40% P2O5+B2O3, 4 to 28% Nb2O5, 0 to 20% TiO2, 10 to 30% Nb2O5+TiO2, 15 to 35% Li2O+Na2O+K2O, and 21 to 38% ZnO, but does not contain BaO, WO3, Bi2O3 or SiO2, and the ratio of the mol % of ZnO to the total mol % of Li2O+Na2O+K2O (i.e., ZnO/(Li2O+Na2O+K2O)) is 0.8 to 2.0.
Claims10
An optical glass comprising, by mole:
- 18% to 38% of P2O5;
- 0% to 15% of B2O3,
- where P2O5+B2O3 equals 23% to 40%;
- 4% to 28% of Nb2O5;
- 0% to 20% of TiO2,
- where Nb2O5+TiO2 equals 10% to 30%;
- 15% to 35% of Li2O+Na2O+K2O;
- and
- 30.51% to 37.24% of ZnO,
- wherein
- ZrO2, As2O3, an F ingredient, PbO, TeO2, Tl2O, CdO, GeO2, Al2O3, La2O3, Gd2O3, Y2O3, Ta2O5, BaO, WO3, Bi2O3, and SiO2 are not contained,
- a ratio ZnO/(Li2O+Na2O+K2O) of a mol % of ZnO to a total mol % of Li2O+Na2O+K2O is 0.8 to 2.0, and
- the optical glass has optical constants with a refractive index (nd) for a d-line in a range of 1.68 to 1.78 and an Abbe number (vd) in a range of 26 to 35.
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Dependencies are inferred from the claim text.