High-refractivity optical glass and preparation method thereof

Abstract

The invention provides high-refractivity optical glass which comprises the following components: 40wt%-46wt% of SiO2, 1wt%-6wt% of P2O5, 2wt%-8wt% of BaO, 1wt%-8wt% of WO3, 11wt%-15wt% of ZnO, 1wt%-5wt% of Nb2O5, 11wt%-16wt% of Li2O, 12wt%-15wt% of La2O3 and 2wt%-6wt% of Gd2O3. The SiO2 has the function of maintaining devitrification resistance of the glass. The ZnO is capable of lowering the thermal expansion coefficient and density of the glass and increasing the chemical stability, heat stability and refractivity of the glass. The Gd2O3 is an effective component for increasing the refractivity and Abbe number of the glass. The refractivity of the high-refractivity optical glass provided by the invention is 1.88-1.92, and the Abbe number is 51-54.

Description

technical field [0001] The invention relates to the technical field of optical glass, in particular to a high-refractive-index optical glass and a preparation method thereof. Background technique [0002] In recent years, with the increasing popularity of digital cameras, digital video cameras, camera phones, etc., the integration level and functions of the equipment used for the optical system have increased rapidly, and the optical system has been required to have higher accuracy, lighter weight and smaller size. size of. Therefore, aspheric mirrors are widely used, and the use of aspheric components has become the mainstream of optical design. [0003] The manufacture of aspheric lenses widely uses the method of precision molding. The so-called precision molding is to mold a glass preform with a high-precision mold with a predetermined product shape under a certain temperature and pressure, so as to obtain a glass product with a final product shape or very close to the ...

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Problems solved by technology

[0005] However, the refractive index of the above-mentioned optical glass needs to be further improved

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