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US 2004/0018933 A1Published application
Optical glass
AssigneeKabushiki Kaisha Ohara
InventorsMichiko Ogino, Yoshio Mori, Masahiro Onozawa
Life of this patent
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Abstract
An optical glass comprises, in mass percent, 15-35% of P2O5, 40-60% of Nb2O5, 0.5% to less than 15% of Na2O and 3% to less than 25% of BaO, has a ratio in mass % of (BaO+Nb2O5)/{(TiO2+WO3)×3+Bi2O3+Nb2O5}>1.0; is free of Pb and As; and has a refractive index (nd) within a range from 1.78 to 1.90 and an Abbe number (νd) within a range from 18 to 27.
Claims14
An optical glass comprising, in mass percent:
- 23 P2O5 15-35% Nb2O5 40-60% Na2O 0.5% to less than 15% and BaO 3% to less than 25%;
- having a ratio in mass % of (BaO+Nb2O5)/{(TiO2+WO3)×3+Bi2O3+Nb2O5}>1.0;
- being free of Pb and As;
- and having a refractive index (nd) within a range from 1.78 to 1.90 and an Abbe number (νd) within a range from 18 to 27.
1 more element
An optical glass comprising, in mass percent:
- 31 P2O5 15-35% Nb2O5 40-60% Gd2O3 0.1-4% Na2O 0.5% to less than 10% K2O 0-6%
- where the total amount of Na2O and K2O is 0.5% to less than 10%
- 32 Bi2O3 0% to less than 5% MgO 0% to less than 10% CaO 0% to less than 10% SrO 0 to less than 10% BaO 0.5% to less than 25% ZnO 0-3% SiO2 0% to less than 5% B2O3 0.2% to less than 5% Al2O3 0-3% Ta2O5 0-5% ZrO2 0-3% Sb2O3 0-0.03% and a fluoride or fluorides of a metal element 0-5%;
- or elements contained in the above metal oxides, a total amount of F contained in the fluoride or fluorides being free of Pb, WO3 and TiO2 and having a refractive index (nd) within a range from 1.78 to 1.90 and an Abbe number (νd) within a range from 18 to 27.
1 more element
An optical glass comprising, in mass percent:
- 33 P2O5 15-30% Nb2O5 42-60% Gd2O3 0.1-4% Na2O 0.5-9.6% K2O 0-6% where the total amount of Na2O and K2O is 0.5% to 9.6% Bi2O3 0-4.5% MgO 0% to less than 10% CaO 0% to less than 10% SrO 0% to less than 10% BaO 0.5% to less than 25% ZnO 0-3% SiO2 0.1% to less than 4% B2O3 0.2% to less than 5% Al2O3 0-3% Ta2O5 0-5% ZrO2 0-3% Sb2O3 0-0.03% and a fluoride or fluorides of a metal element 0-5%;
- or elements contained in the above metal oxides, a total amount of F contained in the fluoride or fluorides being free of Pb, WO3 and TiO2 and having a refractive index (nd) within a range from 1.78 to 1.90 and an Abbe number (νd) within a range from 18 to 27.
Dependencies are inferred from the claim text.