Optical glass, glass perform, optical element and optical instrument

Abstract

The invention provides optical glass with a refractive index of 1.75-1.82 and an Abbe number greater than 46-53. The optical glass comprises the following components in percentage by weight: 10-30% ofB2O3, 5-18% of SiO2, 30-50% of La2O3, 10-25% of Gd2O3 and 3-15% of Y2O3, wherein the ratio of the Gd2O3 to the sum of the La2O3, the Gd2O3 and the Y2O3 is in a range of 0.15-0.4. Through the reasonable component ratio, the high-refraction low-dispersion optical glass disclosed by the invention has relatively high hardness and excellent anti-crystallization performance, and is suitable for the fields of vehicle mounting, monitoring and the like.

Description

technical field [0001] The invention relates to an optical glass, in particular to an optical glass with high refractive index and low dispersion, and a glass preform, an optical element and an optical instrument made of the optical glass. Background technique [0002] Vehicle-mounted lenses are basically wide-angle lenses. In the design, the first lens mostly adopts a lens with a large curved surface. The higher the refractive index of the glass used, the smaller the R of the corresponding lens, and the easier the lens processing is. The reduction of the lens surface is also less likely to be hit by sand and stones. The larger the Abbe number of the glass used, the easier it is to correct the distortion of the wide-angle lens, improve the imaging quality, and realize the possibility of high-definition photography, especially when the refractive index (nd) is 1.75-1.82 and the Abbe number (νd) is greater than 46. -53 high refractive index and low dispersion optical glass, t...

AI Technical Summary

Problems solved by technology

However, 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. The resulting problem is that the glass has poor resistance to devitrification. Easy to crystallize during molding

JP 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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