Optical glass with high index of refraction

Abstract

The invention discloses optical glass with high index of refraction, and belongs to the technical field of optical glass. The invention mainly provides the optical glass with high index of refraction, wherein the index of refraction (nd) of the optical glass is 1.77 to 1.82, the Abbe number (nu d) of the optical glass is in a range of 45 to 50, and the optical glass has low devitrification tendency and high transmittance in the absence of ThO2, harmful components and expensive GeO2 component and is suitable for secondary die pressing. The optical glass is mainly characterized by comprising the following components: 0.5 to 7 percent of SiO2, 20 to 40 percent of B2O3, 25 to 45 percent of La2O3, 1 to 20 percent of Gd2O3, 0 to 15 percent of Y2O3, 0 to 15 percent of Yb2O3, 1 to 20 percent of Ta2O5, 0 to 5 percent of Nb2O5, 0.5 to 8 percent of ZrO2, 0.5 to 5 percent of SnO2, 0.5 to 7 percent of ZnO, and 0 to 5 percent of Al2O3, wherein sigma (La2O3 + Gd2O3 + Y2O3 + Yb2O3) is more than or equal to 35 and less than or equal to 60, and sigma (ZrO2 + SnO2 + ZnO) is more than or equal to 5 and less than or equal to 15. The optical glass is mainly used for small, ultrathin and wide-angle optical elements matched with the optical glass with high index of refraction and low Abbe number.

Description

technical field [0001] The invention belongs to the technical field of optical glass, and specifically relates to a high refractive index (1.77≤n d ≤1.82), high Abbe number (45≤υ d ≤50), and does not contain harmful oxide components and expensive GeO 2 An optical glass with equal composition, and a method for producing an optical element with good devitrification resistance and high visible light transmission from the optical glass. Background technique [0002] In the design of optical systems, such high-refractive-index glass is usually used to achieve miniaturization, ultra-thinning and wide-angle optical components such as aspheric lenses, and this type of glass can better achieve this purpose. High efficiency, low Abbe number glass, in the design of special optical system, can realize the purpose of compensating and correcting chromatic aberration. [0003] Early production of this type of glass all contained the radioactive oxide ThO 2 , while using Ta 2 o 5 , Yb...

AI Technical Summary

Problems solved by technology

[0006] The optical glass disclosed in CN1532160A with a refractive index above 1.80 belongs to the category of this type of glass, but the devitrification performance and transmittance of the glass cannot be expressed, and it cannot be mass-produced

But the glass contains expensive GeO 2 composition, and the vitrification stability and transmittance cannot be expressed, and the devitrification performance of the glass is also insufficiently expressed

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