High-refractive-index glass
AssigneeNippon Electric Glass Co., Ltd.
InventorsTomoki Yanase, Takashi Murata
Life of this patent
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Abstract
Provided is a high refractive index glass, comprising, as a glass composition in terms of mass %, 0.1 to 60% of SiO2+Al2O3+B2O3, having a mass ratio (BaO+La2O3+Nb2O5+TiO2+ZrO2)/(SiO2+Al2O3+B2O3) of 0.1 to 50, amass ratio (MgO+CaO+SrO+BaO)/(BaO+La2O3+Nb2O5+TiO2+ZrO2) of 0 to 10, and a mass ratio (TiO2+ZrO2)/(BaO+La2O3+Nb2O5) of 0.001 to 40, and having a refractive index nd of 1.55 to 2.3.
Claims22
A high refractive index glass, comprising, as a glass composition in terms of mass %, 0.1 to 60% of SiO2+Al2O3+B2O3, having a mass ratio (BaO+La2O3+Nb2O5+TiO2+ZrO2)/(SiO2+Al2O3+B2O3) of 0.1 to 50, a mass ratio (MgO+CaO+SrO+BaO)/(BaO+La2O3+Nb2O5+TiO2+ZrO2) of 0 to 10, and a mass ratio (TiO2+ZrO2)/(BaO+La2O3+Nb2O5) of 0.001 to 40, and having a refractive index nd of 1.55 to 2.3.
6-11. (canceled)
A high refractive index glass, comprising, as a glass composition in terms of mass %, 10 to 60% of SiO2, 0 to 5% of B2O3, 0.1 to 60% of BaO, 0.1 to 40% of La2O3+Nb2O5, and 0 to 10% of Li2O+Na2O+K2O, having a value for a mass ratio (MgO+CaO)/(SrO+BaO) of 0 to 0.5, and having a strain point of 600° C. or more and a refractive index nd of 1.55 to 2.3.
20-25. (canceled)
A high refractive index glass, comprising, as a glass composition in terms of mol %, 20 to 70% of SiO2+Al2O3+B2O3, 20 to 70% of SiO2, 0 to 30% of B2O3, 0 to 50% of MgO+CaO+SrO+BaO, and 0 to 30% of BaO+La2O3+Nb2O5+ZrO2+TiO2, having a molar ratio B2O3/SiO2 of 0 to 1, a molar ratio SiO2/(MgO+CaO+SrO+BaO+La2O3+Nb2O5) of 0.1 to 6, and a molar ratio (MgO+CaO+SrO+BaO)/(MgO+CaO+SrO+BaO+La2O3+Nb2O5+Gd2O3) of 0.1 to 0.99, and having a refractive index of 1.55 to 2.3.
32-37. (canceled)
Dependencies are inferred from the claim text.