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US 12,559,413 B2Granted
Optical glass, preform for precision press molding, and optical element
AssigneeSumita Optical Glass, Inc.
InventorTatsuya Tezuka
Life of this patent
Estimating the term…
Abstract
Provided is an optical glass having a composition including, by mol %: 0% to 15 % B2O3; 25% to 40% P2O5, the total content of B2O3 and P2O5 being 35% to 45%; 0% to 10% Al2O3; 5% to 15% Li2O; 0% to 15% Na2O; 0% to 5% K2O; 0% to 35% MgO; 0% to 35% CaO, the total content of MgO and CaO being 20% or more; 0% to 5 % ZnO; 0% to 3% ZrO2; 0% to 3% Y2O3; 0% to 3% La2O3; and 0% to 3% Gd2O3. The composition does not contain SrO and BaO.
Claims20
An optical glass comprising a composition consisting only of, by mol %:
- 0% or more and 15% or less B2O3;
- 25% or more and 40% or less P2O5, the total content of B2O3 and P2O5 being 35% or more and 45% or less;
- 0% or more and 10% or less Al2O3;
- 5% or more and 15% or less Li2O;
- 0% or more and 15% or less Na2O;
- 0% or more and 5% or less K2O;
- 0% or more and 35% or less MgO;
- 0% or more and 35% or less CaO, the total content of MgO and CaO being 20% or more;
- 0% or more and 5% or less ZnO;
- 0% or more and 3% or less ZrO2;
- 0% or more and 3% or less Y2O3;
- 0% or more and 3% or less La2O3;
- and
- 0% or more and 3% or less Gd2O3,
- wherein the composition does not contain SrO and BaO, and
- the optical glass has an Abbe number (νd) of 62 or more and 70 or less.
13 more elements
Dependencies are inferred from the claim text.