High refraction and low dispersion optical glass

An optical glass and low dispersion technology, applied in the field of optical glass, can solve the problems of expensive germanium oxide, easy devitrification, and high cost of optical glass, and achieve the effect of low cost, high light transmittance, and stable production

Active Publication Date: 2009-03-18
CDGM OPTICAL GLASS
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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

Method used

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  • High refraction and low dispersion optical glass

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Embodiment Construction

[0014] B 2 o 3 It is a glass network generator oxide, which is an essential component of the glass network, especially in high refractive index and low dispersion optical glass, B 2 o 3 It is the main ingredient to obtain stable glass. When B 2 o 3 When the content is less than 6%, it is difficult to obtain glass with stable properties, and the devitrification resistance is not ideal; when B 2 o 3 When the content is higher than 17%, the refractive index of the glass cannot reach the design target, so the B 2 o 3 The content is limited to 6%-17%, more preferably 9-16%, most preferably 10-16%.

[0015] SiO 2 It is also a network generator oxide that forms glass, adding a certain amount of SiO 2 It can increase the high-temperature viscosity of glass and improve the devitrification resistance of glass. However, when the content is less than 2%, the effect is not sufficient; and when the content is more than 10%, the melting property of the glass deteriorates and it is...

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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, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C3/068
CPCC03C3/068
Inventor 匡波文伟李维民
Owner CDGM OPTICAL GLASS
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