Optical glass

Abstract

The invention provides high-refraction low-dispersion optical glass with excellent impermeability. The optical glass comprises the following components in percentage by weight: 5-25% of B2O3, 1-15% ofSiO2, 30-50% of La2O3, 4-20% of Gd2O3, 2-15% of Y2O3, 0-15% of Ta2O5 and 0-8% of ZrO2, wherein the ratio of Y2O3 to (La2O3+Gd2O3+Y2O3) is 0.03-0.3. An appropriate amount of La2O3, Gd2O3, Y2O3 and other rare-earth oxide components with high-refraction low-dispersion effects is introduced, and the ratio of the various components is optimized, so that the high-refraction low-dispersion optical glasswith excellent impermeability as well as glass prefabricated parts and optical elements formed from the optical glass can be obtained. Moreover, the requirements on novel modern photoelectric products can be met.

Description

technical field [0001] The invention relates to an optical glass with high refractive index and low dispersion characteristics, as well as a glass preform and an optical element formed from the optical glass. Background technique [0002] Combining lenses made of high refractive index and low dispersion optical glass with lenses made of high refractive index and high dispersion optical glass can correct chromatic aberration and miniaturize the optical system, especially when the refractive index nd is 1.82-1.86 and the Abbe number νd is 40-46 high refractive index and low dispersion optical glass, the market demand is increasing day by day. [0003] The content of rare earth element components in the glass components satisfying the above optical properties is large, while the content of components used to form glass network formers is relatively small. easy to crystallize. Japanese Patent Application Laid-Open No. 2008-1551 discloses a high-refraction and low-dispersion op...

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Problems solved by technology

[0003] The content of rare earth element components in the glass components satisfying the above optical properties is large, while the content of components used to form glass network formers is relatively small. easy to crystallize

Japanese Patent Laid-Open No. 2008-1551 discloses a high-refraction and low-dispersion optical glass, but its resistance to devitrification is poor, and complex cooling methods are required to suppress devitrification when the glass is formed.

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