Optical glass

Abstract

To provide optical glass that achieves both high refractive index and high light transmittance, while also being highly producible for mass production. [Solution] An optical glass containing, by mass%, SiO20-15%, La2O35-47%, Nb2O52-30%, La2O3+Gd2O3+Y2O3+Yb2O35-47%, MgO+CaO+SrO+BaO+ZnO over 6%, and B2O3+WO30-3.0%, with a refractive index nd of 2.05 or higher.

Claims

【Request Item 1】 By mass%, SiO ２ 0 to 15%, La ２ O ３ 5 to 47%, Nb ２ O ５ 2 to 30%, La ２ O ３ + Gd ２ O ３ + Y ２ O ３ + Yb ２ O ３ 5 to 47%, MgO + CaO + SrO + BaO + ZnO more than 6%, B ２ O ３ + WO ３ 0 to 3.0%, and having a refractive index nd of 2.05 or more, an optical glass. 【Request Item 2】 Furthermore, in mass percent, TiO ２ 0-25%, WO ３ The optical glass according to claim 1, containing 0 to less than 1%. 【Request Item 3】 Internal transmittance τ at a thickness of 10 mm and wavelength of 450 nm ４５０ The optical glass according to claim 1 or 2, wherein the percentage is 92% or more.

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