Optical glass for high-refractivity low dispersion precision die mould

Abstract

The invention provides a high-refractivity, low-dispersivity, fine moulding optical glass, comprising SiO2:1-8wt%, B2O3:16-30wt%, La2O3:15-40wt%, Gd2O3:0-20wt%, ZnO:8-30wt%, Nb2O5:0.5-14.5wt%, WO3:0-12.5wt%, TiO2:0-9wt%, Li2O:0.5-4wt%, ZrO2:1-10 wt%, Y2O3:0-5 wt%, Yb2O3:0-5 wt%, Lu2O3:0-5 wt%, Na2O: 0-3 wt%, K2O:0-2 wt%, Al2O3:0-2 wt%, BaO:0-3 wt%, CaO:0-3 wt%, SrO:0- 3 wt%, MgO:0-3 wt%, Sb2O3:0-0.5 wt%, and SnO2:0-0.5 wt%. And the invention adopts a B2O3-SiO2-La2O3(Gd2O3)-ZnO system, and uses Nb2O5, WO3 and TiO2 in the reasonable proportion to make glass have the required optical constants and good physicochemical properties of fine moulding. And its transformation temperature (Tg) is lower than 560 deg.C. And it has no high-price Ta2O5 but has good chemical stability, able to be produced in batches and stably by single pot or continous smelting furnace, or other equipment, and suitable for low-cost and fine moulding nonspherical lenses and other optical components.

Description

technical field [0001] The invention relates to an optical glass, in particular to a high refractive index and low dispersion optical glass with a refractive index (Nd) of 1.77-1.84 and an Abbe number (Vd) of 36-44. Background technique [0002] With the fierce competition and development of the optoelectronic product market, manufacturing optical components with high yield and low cost is the goal of every optical material and optical component manufacturer. The use of precision molding technology (including direct pressing method and secondary pressing method) can reduce raw material consumption, greatly reduce the amount of mechanical processing of optical components, thereby reducing the cost of manpower and material resources, and can easily achieve stable batch production. environmental pollution. On the other hand, in recent years, digital cameras, digital video cameras, camera phones, etc. have become increasingly popular, and the degree of integration and functions...

AI Technical Summary

Problems solved by technology

Chinese patent 02155831.0 discloses a B 2 o 3 -SiO 2 -La 2 o 3 -Gd 2 o 3 -ZnO-Li 2 An optical glass system composed of O, but the Abbe number of the glass is difficult to reach below 43, and from its examples, the glass composition contains more expensive Ta 2 o 5 , the cost of glass is higher, which reduces the competitiveness of products

Japanese Patent Application No. 06-305769 discloses a SiO 2 -B 2 o 3 -La 2 o 3 -Ta 2 o 5 -ZnO-Li 2 O system optical glass for precision molding, this system glass also uses more Ta 2 o 5 , and the liquidus temperature of the glass is high, which is not conducive to mass production

Japanese Patent Laying-Open 2002-362938 discloses a kind of B 2 o 3 -SiO 2 -La 2 o 3 -ZnO-Nb 2 o 5 -Ta 2 o 5 -WO 3 System and B disclosed in JP-A-2002-012443 2 o 3 -SiO 2 -La 2 o 3 -Li 2 O-ZnO-Nb 2 o 5 -Ta 2 o 5 -WO 3 Although the system can achieve a lower softening temperature, a certain amount of Ta 2 o 5 , expensive glass