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US 12,122,712 B2Granted
High index low density glass
AssigneeCorning Incorporated
InventorsJian Luo, Alexander I Priven
Life of this patent
Estimating the term…
Abstract
A glass comprising greater or equal to 30.0 mol % SiO2, the glass being free of iron, lead, antimony ant tantalum oxides, and having a refractive index nd greater than or equal to 1.75 and a linear thermal expansion coefficient α20-300, in the temperature range 20-300° C., that is less than or equal to about 65×10−7 K−1.
Claims15
A glass comprising:
- from 30.0 mol % to 45 mol % SiO2, from 0.5 mol% to 15 mol% Al203, from 10 mol % to 20 mol % TiO2, from 3 mol % to 20 mol % ZnO, from 0.3 mol % to 10 mol % La2O3, and from 5 mol % to 20 mol % MgO+CaO+SrO+BaO, wherein the glass is free of iron, lead, antimony and tantalum oxides, said glass having a refractive index nd greater than or equal to 1.75 and a linear thermal expansion coefficient α20-300, in the temperature range 20° C. to 300° C., that is less than or equal to 65×10−7 K−1.
A glass comprising:
- from 30.0 mol % to 45 mol % SiO2, from 0.5 mol% to 15 mol% Al2O3, from 10 mol % to 20 mol % TiO2, from 3 mol % to 20 mol % ZnO, from 0.3 mol % to 10 mol % La2O3, and from 5 mol % to 20 mol % MgO+CaO+SrO+BaO, wherein said glass having a refractive index nd greater than or equal to 1.75, a linear thermal expansion coefficient (α20-300) that is less than or equal to 80×10−7 K−1, and a Young's elastic modulus (E) that is greater than or equal to 100 GPa.
A glass composition comprising:
- from 30.0 mol % to 45 mol % SiO2, from 0.5 mol% to 15 mol% Al2O3, from 10 mol % to 20 mol % TiO2, from 3 mol % to 20 mol % ZnO, from 0.3 mol % to 10 mol % La2O3, and from 5 mol % to 20 mol % MgO+CaO+SrO+BaO, and substantially free of the compounds of Fe, Pb, Sb, and Ta,
- wherein the glass composition has:
- a refractive index nd that is greater than or equal to 1.75 and a thermal expansion coefficient that is less than or equal to 65.0*10−7 K−1 in the temperature range 20° C. to 300° C.
Dependencies are inferred from the claim text.