Environmental protective heavy flint optical glass in high refractive index, and high dispersion, and producing method and equipment

Abstract

This invention provides a method for producing environmentally friendly heavy-flint optic glass with high refractivity and high color dispersion. The heavy-flint optic glass is composed of: SiO2 20-44 wt.%, TiO2 22-34 wt.%, Nb2O5 5-22 wt.%, Na2O 7-18 wt.%, BaO 9-17 wt.%, K2O 0-9 wt.%, CaO 0-3 wt.%, ZrO2 0-3 wt.%, SrO 0-0.5 wt.% and Sb2O3 0-0.5 wt.%. The method comprises (1) mixing the raw materials uniformly; (2) melting in a tank furnace at 1150-1300 deg.C to obtain glass liquid with uniform refractivity; (3) clearing, homogeneizing and molding the glass liquid into glass stripes; (4) annealing in an annealing furnace. The equipment comprises a tank furnace and an annealing furnace. The melting pool of the tank furnace is connected with an automatic burning control system. The heavy-flint optic glass dose not contains pollutive components such as PbO, As2O3 and GdO. The method can reduce the times of high-temperature melting and improve the optic permeability.

Description

technical field [0001] The invention relates to an optical glass and its production method and equipment, in particular to a high refractive index (Nd) high dispersion environment-friendly heavy flint optical glass and its production method and equipment. Background technique [0002] With the improvement of people's living standards, in order to meet the high image number, small and light requirements of high-end digital products, the demand for heavy flint optical glass with the advantages of high refractive index, high dispersion (low Abbe number), and low density is increasing. Large, but the PbO and As contained in the optical glass 2 o 3 and GdO cause serious pollution to the environment. For this reason, optical equipment manufacturers require that glass with the same optical properties does not contain PbO, As 2 o 3 and GdO ingredients. [0003] In order to make the optical glass have a high refractive index, TiO in the glass composition 2 and Nb 2 o 5 The con...

AI Technical Summary

Problems solved by technology

Because this production method passes through two high temperatures, the optical transmission performance of the glass is affected, and there are many processes, long production cycle and high production cost.

Images