Optical glass

Abstract

The invention provides optical glass. The optical glass is prepared from, by weight, 5-25% of SiO2, 0-15% of B2O3, 10-30% of La2O3, 13-35% of TiO2, 2-25% of Nb2O5 and 5-25% of BaO. According to the optical glass, through the reasonable formula design, the refractive index of the optical glass is 1.92-2.0, the Abbe number is 20-28, and the optical glass has excellent chemical stability and good crystallization resistance and transmittance and can be widely applied to equipment such as surveillance cameras, digital cameras, digital video cameras and camera mobile phones.

Description

technical field [0001] The invention relates to an optical glass with a refractive index of 1.92-2.0 and an Abbe number of 20-28, as well as a glass preform, an optical element and an optical instrument made of the optical glass. Background technique [0002] High refractive index optical glass can eliminate advanced spherical aberration and improve imaging quality in wide field of view and large aperture optical systems. At the same time, it can effectively simplify the optical design of the lens, reduce the volume and weight of the lens, and miniaturize the optical system. , light weight and integration become possible, and achieve the effect that traditional optical glass cannot achieve, so it becomes an indispensable component material in optical design. Known in the field of high refraction and high dispersion optical glass is glass containing a large amount of lead, such as JP Patent 57-34042, which contains a large amount of lead oxide, and the glass has a large speci...

AI Technical Summary

Problems solved by technology

Known in the field of high refraction and high dispersion optical glass is glass containing a large amount of lead, such as JP 57-34042, which contains a large amount of lead oxide, and the glass has a large specificity, which is not suitable for the current lightweight needs. The environment is also harmful and cannot meet environmental protection requirements

[0003] In addition, some high-refraction and high-dispersion glasses use bismuth-containing glass systems, resulting in poor chemical stability of the glass, which reduces the yield of glass in the later processing and coating processes. CN102459106A discloses a glass with a refractive index greater than 1.925 and an Abbe number of 10-30 high refraction high dispersion glass, which contains 20-90% Bi 2 o 3 , the chemical stability of the glass is poor, which brings difficulties to the later processing and reduces the market competitiveness of the product

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