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US 12,767,585 B2Granted
Optical glass, optical element blank, and optical element
AssigneesHoya Corporation, Hoya Optical Technology (Weihai) Co., Ltd.
InventorHayato Sasaki
Life of this patent
Estimating the term…
Abstract
Provided is optical glass in which a refractive index nd is 1.950 or more, an amount of P2O5 is 10.0 to 40.0 mass %, an amount of TiO2 is 5.0 to 40.0 mass %, an amount of Nb2O5 is 20.0 to 60.0 mass %, an amount of Bi2O3 is 20.0 mass % or less, a total amount of Al2O3 and SiO2 [Al2O3+SiO2] is 2.0 mass % or less, a total amount of Li2O, Na2O, and K2O [Li2O+Na2O+K2O] is 5.0 mass % or less, and a total amount of ZnO, SrO, and BaO [ZnO+SrO+BaO] is 0.01 to 12.0 mass %.
Claims17
Optical glass,
- wherein a refractive index nd is 1.950 or more,
- an amount of P2O5 is 10.0 to 40.0 mass %,
- an amount of TiO2 is 18.0 to 40.0 mass %,
- an amount of Nb2O5 is 20.0 to 60.0 mass %,
- an amount of Bi2O3 is 20.0 mass % or less,
- an amount of WO3 is 15.0 mass % or less,
- a total amount of Al2O3 and SiO2 [Al2O3+SiO2] is 2.0 mass % or less,
- a total amount of Li2O, Na2O, and K2O [Li2O+Na2O+K2O] is 5.0 mass % or less,
- a total amount of ZnO, SrO, and BaO [ZnO+SrO+BaO] is 0.01 to 12.0 mass %,
- a mass ratio [TiO2/(TiO2+Nb2O5)] between the amount of TiO2 and the total amount of TiO2 and Nb2O5 [TiO2+Nb2O5] is 0.20 to 0.60,
- a mass ratio [(Li2O+Na2O+MgO+CaO+ZnO+SrO)/(K2O+BaO)] between a total amount of Li2O, Na2O, MgO, CaO, ZnO, and SrO [Li2O+Na2O+MgO+CaO+ZnO+SrO], and a total amount of K2O and BaO [K2O+BaO] is 0.51 or less, and
- a mass ratio [TiO2/([Li2O+Na2O+K2O])] between the amount of TiO2 and the total amount of Li2O, Na2O, and K2O [Li2O+Na2O+K2O] is 1.0 to 50.
9 more elements
Dependencies are inferred from the claim text.