Dense lanthanum flint optical glass as well as preparation method and optical element thereof

Abstract

The invention relates to a dense lanthanum flint optical glass as well as a preparation method and an optical element thereof. The dense lanthanum flint optical glass is prepared from the following components in percentage by weight: 5.5 to 8% of SiO2 (silicon dioxide), 22 to 27% of B2O3 (boric oxide), 42 to 49% of La2O3 (lanthanum oxide), 0.1 to 2.9% of ZnO (zinc oxide), 7 to 9% of ZrO2 (zirconium dioxide), 3.1 to 6% of Nb2O3 (niobium oxide), 6 to 8% of Y2O3 (yttrium oxide), 1 to 8% of Gd2O3 (gadolinium oxide), and 0.01 to 0.1% of Sb2O3 (antimonous oxide). The dense lanthanum flint optical glass has the advantages that the reflectivity nd is between 1.801 and 1.821, and the abbe number upsilond is between 46 and 49; the chemical stability and coloring degree are good; the specific weight is lower, and the weights of a glass element and an optical system are reduced; the crystallizing temperature is lower, and the batched production is easily realized.

Description

technical field [0001] The invention relates to a heavy lanthanum flint optical glass, a preparation method thereof and an optical element, belonging to the field of optical glass. Background technique [0002] In recent years, in order to meet the high-pixel, small and light requirements of high-end digital products, there is an increasing demand for heavy lanthanum flint optical glass with advantages such as high refraction, medium dispersion, and small specific gravity. In order to make the glass have the above properties, the La in the glass 2 o 3 、Gd 2 o 3 , Nb 2 o 5 、TiO 2 、 Ta 2 o 5 , ZnO, ZrO 2 The content of components is also gradually increasing, but too much of these components will lead to low viscosity of the glass, difficulty in molding, difficulty in obtaining high-quality stripes, and serious crystallization and other defects. At the same time, in today's increasingly fierce market competition, the addition of certain ingredients will undoubtedly i...

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Problems solved by technology

However, it contains the expensive Ta2O5 component as an essential component and Li which will destroy the glass network structure and deteriorate the crystallization performance of the glass. 2O component

[0010] patent application CN1510002A discloses that the refractive index nd is 1.75~1.85, the Abbe number υd is Optical glass above 35, its composition contains 10-30% ZnO, too much ZnO will make the glass devitrification resistance and chemical stability worse

In addition, it also contains 15.5-25% of expensive Ta2O5 components, which will greatly increase the cost of glass

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