Optical glass, glass prefabricated part, optical element and optical instrument

Abstract

The invention provides high-refractive-index low-chromatic-dispersion optical glass. The optical glass comprises, by weight, 20-35% of B2O3, 32-52% of La2O3, 6-20% of Y2O3, 0-15% of Gd2O3 and 1-12% ofZrO2, wherein Y2O3 / (Y2O3+Gd2O3) is 0.6-1.0. The Young modulus E of the optical glass is 10000*10<7> or above. Through reasonable component design, the obtained optical glass has high refractive indexand low chromatic dispersion, and is low in production cost, excellent in devitrification resistance and high in Young modulus.

Description

technical field [0001] The invention relates to an optical glass, in particular to an optical glass with high refractive index and low dispersion. Background technique [0002] Today, with the rapid development of science and technology, devices such as digital cameras, digital video cameras, and camera phones are becoming more and more popular. Taking the traditional SLR camera as an example, several spherical lenses are required in one lens, and aspherical lenses processed by high refractive index and low dispersion optical glass can replace several spherical lenses with one piece, which greatly reduces the weight of the lens . Combining lenses made of high-refractive-index low-dispersion optical glass with lenses made of high-refractive-index high-dispersion optical glass can correct chromatic aberration and miniaturize the optical system, especially when the refractive index nd is 1.75 to 1.81 and the Abbe number νd is 45-51 environmental protection optical glass with ...

AI Technical Summary

Problems solved by technology

Chinese patent CN102849942A discloses an optical glass with a refractive index of 1.74-1.80 and an Abbe number of 45-55, which contains 16%-23% of Gd 2 o 3 , its resistance to devitrification is poor, and a large amount of expensive Gd 2 o 3 The introduction also increases the production cost of optical glass

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