Environmental protective flint optical glass with heavy lanthanum, production method and equipment

Abstract

This invention provides environmentally friendly heavy lanthanum flint optical glass with high refractive index and medium optical dispersion. The optical glass is composed of: SiO2 20-40 wt.%, B2O3 5-20 wt.%, TiO2 5-20 wt.%, Nb2O5 5-20 wt.%, ZrO2 0-3 wt.%, Sb2O3 0-0.5 wt.%, La2O3 10-30 wt.%, K2O + Na2O 0-5 wt.%, and BaO + CaO + SrO 12-40 wt.%. The optical glass does not contain pollutive components such as PbO, As2O3 or GdO2. Its Nd is 1.74-1.83, and Nf-Nc is 32-47. This invention adopts one-step material melting in a tank furnace to produce the optical glass, and has such advantages as simple process, short production time.

Description

technical field [0001] The invention relates to an optical glass and its production method and equipment, in particular to an environment-friendly heavy lanthanum flint optical glass with high refractive index (Nd) and medium dispersion (Nf-Nc) and its production method and equipment. Background technique [0002] With the improvement of people's living standards, in order to meet the high-pixel, small and light requirements of high-end digital products, the demand for heavy lanthanum flint optical glass with the advantages of high refraction, medium dispersion, and low density is increasing. In order to make the optical glass have the above properties, the La in the glass component 2 o 3 、TiO 2 , Nb 2 o 5 It will also increase accordingly, but these components will lead to the consequences of low viscosity of glass liquid, severe crystallization, large fluctuations in optical constants, and large corrosion of equipment during the production process, making the quality o...

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Problems solved by technology

Because this method goes through two high temperatures, which affects the permeability of the glass, and there are many processes, the production cycle is long, and the production cost is high.

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