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US 8,148,280 B2Granted
Optical glass
AssigneeKabushiki Kaisha Ohara
InventorSusumu Uehara
Life of this patent
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Abstract
An optical glass of the present invention has optical constants of a refractive index (nd) within a range from 1.75 to 1.85 and an Abbe number (νd) within a range from 35 to 45, comprises SiO2 and B2O3 as essential components and one or more components selected from the group consisting of ZrO2, Nb2O5, Ta2O5 and WO3, has a glass transition temperature (Tg) of 580° C. or below and has weathering resistance (surface method) of Class 1 or Class 2.
Claims9
An optical glass comprising:
- SiO2, B2O3, La2O3, ZrO2, Nb2O5, Ta2O5, WO3, ZnO, and Li2O being substantially free of lead component, arsenic component and fluorine component, having a total amount of said oxides exceeding 96 mass %,
- wherein the optical glass contains SiO2 from 6% to 10%, having a ratio of ZnO/SiO2 of 3.303 or over,
- wherein the optical glass has a glass transition temperature (Tg) of 580° C. or below and having weathering resistance (surface method) of Class 1 or Class 2, and
- wherein the optical glass has optical constants of a refractive index (nd) within a range from 1.75 to 1.85 and an Abbe number (νd) within a range from 35 to 45.
1 more element
Dependencies are inferred from the claim text.