High refraction and low dispersion optical glass

Abstract

The invention provides an environment-friendly optical glass with high refractive index, low dispersion and high light transmittance, which has components according to weight percentage: B2O3: 6 percent to 17 percent, SiO2: 2 percent to 10 percent, La2O3: more than 25 percent but less than 45 percent, Gd2O3: 5 percent to 25 percent, Nb2O5: 0 to 3 percent, Ta2O5: more than 19 percent but less than 27 percent, ZnO: 0 percent to 16 percent, BaO: 0 percent to 5 percent, CaO: 0 percent to 5 percent, SrO: 0 percent to 5 percent, ZrO2: 0 percent to 9 percent, Y2O3: 0 percent to 8 percent, Yb2O3: 0 percent to 8 percent, WO3: 0 percent to 5 percent, Li2O, Na2O and K2O: the total content of 0 percent to 2 percent, Sb2O: equal to 0.01 percent or less than 0.1 percent, SnO2: 0 percent to 1 percent. GeO2 is not included in the components of the environment-friendly optical glass and the refractive index is 1.85 to 1.90, while the Abbe number is 35 to 45. Meanwhile, the corresponding wavelength is below 440nm when the transmittance thereof is up to 80 percent, and the environment-friendly optical glass has high light transmittance.

Description

technical field [0001] The invention relates to an optical glass, in particular to an optical glass with a refractive index (nd) of 1.85-1.90 and an Abbe number (vd) of 3545. Background technique [0002] High-refraction and low-dispersion optical glass is widely used in new optoelectronic products to improve its imaging quality. In order to solve the problem that high-refraction and low-dispersion optical glass is easy to devitrify during smelting and production, germanium oxide is usually added to the formula in the past, such as Japanese special Kai 2006-151758A discloses a GeO 2 —B 2 o 3 —La 2 o 3 —ZnO—Bi 2 o 3 High refraction and low dispersion optical glass, but its GeO 2 The content is as high as 13% (mass percentage content, the same below) or even 17%. Since germanium oxide is expensive, the cost of this optical glass is relatively high. [0003] The transmittance of optical glass is greatly affected by the refractive index. The higher the refractive index, ...

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Problems solved by technology

[0002] High-refraction and low-dispersion optical glass is widely used in new optoelectronic products to improve its imaging quality. In order to solve the problem that high-refraction and low-dispersion optical glass is easy to devitrify during smelting and production, germanium oxide is usually added to the formula in the past, such as Japanese special Kai 2006-151758A discloses a GeO 2 —B 2 o 3 —La 2 o 3 —ZnO—Bi 2 o 3 high refraction and low dispersion optical glass, but its GeO 2 The content is as high as 13% (mass percentage content, the same below) or even 17%. Because germanium oxide is expensive, the cost of this optical glass is relatively high

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