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US 11,958,769 B2Granted
Optical glass, glass preform or optical element made therefrom, and optical instrument
AssigneeCdgm Glass Co., Ltd
InventorWei Sun
Life of this patent
Estimating the term…
Abstract
Disclosed are optical glass, a glass preform or an optical element made therefrom and an optical instrument. The optical glass is calculated by a mass percentage content relative to a total mass of glass converted by an oxide, and the optical glass includes: B2O3: 5˜25%, La2O3: 25−45%, Gd2O3: 15−35%, Y2O3: 0−10%, Yb2O3: 0˜10%, Nb2O5: 2−15%, SiO2: 0.5˜15%, ZrO2: 1−15%, TiO2: 0.5˜10% and WO3: 0˜10%, a weight ratio of Nb2O5 to TiO2, i.e., Nb2O5/TiO2, is 2.17−8.5, and Ta2O5 is not contained.
Claims20
An optical glass, in terms of oxide mass percentages, the optical glass comprises:
- B2O3:
- 5-25%, La2O3:
- 25-45%, Gd2O3:
- 15-35%, Y2O3:
- 0-10%, Yb2O3:
- 0-10%, Nb2O5:
- 2-15%, SiO2:
- 0.5-15%, ZrO2:
- 1-15%, TiO2:
- 0.5-10% and WO3:
- 0-10%, a weight ratio of Nb2O5 to TiO2, i.e., Nb2O5/TiO2, is 2.17-8.5, and Ta2O5 is not comprised;
- a weight ratio of the La2O3 to Gd2O3, i.e., La2O3/Gd2O3, is 1.28-1.625.
9 more elements
Dependencies are inferred from the claim text.