Optical glass

Abstract

The invention provides optical glass which is low in density, high in transmittance, high inrefractive index and low in chromatic dispersion, the refractive index of the glass is 1.80-1.85, and the abbe number is 40-45. The optical glass comprises B2O3, La2O3, Y2O3, Nb2O5 and ZrO2, and according to the weight percentage, Y2O3 / (Nb2O5+ZrO2) is 0.43-1.4. The introducing amount of Ta2O5 is reduced in the glass components, the appropriate amount of La2O3, Gd2O3, Y2O3, Yb2O3 and rare earth oxide components with the high refractive index and low chromatic dispersion are introduced, Nb2O5 and ZrO2 of an appropriate ratio are introduced, the component compatibility is optimized, the high-refractive-index and low-chromatic-dispersion optical glass which is low in density, high in transmittance and free of devitrification, and a glass prefabricated member and optical element made of the optical glass are obtained.

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] With the development of the optoelectronic industry, the requirements for light weight, miniaturization and high performance of optical equipment are put forward. The lens formed by high refractive index and low dispersion optical glass is combined with the lens formed by high refractive index and high dispersion optical glass. The market demand for correcting chromatic aberration, especially high-refractive-index low-dispersion optical glass with a refractive index (nd) of 1.80-1.85 and an Abbe number (νd) of 40-45, is increasing day by day. [0003] CN101386469A discloses a high refraction and low dispersion optical glass, the optical glass component contains a large amount of Ta 2 o 5 , while Ta 2 o 5 High density and expensive raw m...

AI Technical Summary

Problems solved by technology

[0003] CN101386469A discloses a high refraction and low dispersion optical glass, the optical glass component contains a large amount of Ta 2 o 5 , while Ta 2 o 5 High density, expensive raw materials

In addition, this type of optical element has high requirements on the transmittance of optical glass. If the transmittance is not good, the image quality will be reduced. Therefore, it is hoped that the optical glass has good transmittance performance.

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