High-refractive index high-dispersive index optical glass, optical element, and optical instrument

Abstract

A high refractivity and high dispersion optical glass with light transmissivity and good devitrification resistance. The high refractivity and high dispersion optical glass, including: 1 wt % to 13 wt % of SiO2, 6 wt % to 15 wt % of B2O3, 5 wt % to 22 wt % of TiO2, 35 wt % to 60 wt % of La2O3, 1 wt % to 15 wt % of Gd2O3, 2 wt % to 10 wt % of ZrO2, 1 wt % to 15 wt % of Nb2O5, 0.5 wt % to 8 wt % of ZnO, 0 to 8 wt % of WO3 and 0 to 10 wt % of Y2O3, with Ta2O5 and GeO2 excluded. The optical glass has degree of pigmentation and light transmissivity due to no pigmenting Bi2O3, and has low cost due to no valuable oxides such as Ta2O5 and GeO2. The optical glass has devitrification resistance with a refractive index of 1.95-2.07 and Abbe number of 25-35.

Description

technical field [0001] The invention relates to a high refraction and high dispersion optical glass, in particular to a high refraction and high dispersion optical glass with a refractive index (nd) of 1.95-2.07 and an Abbe number (νd) of 25-35, and the optical glass Consists of preforms, optical components and optical instruments. Background technique [0002] In recent years, the development trend of digital imaging equipment has two main points. One is that the volume is getting smaller and smaller, which can be made very light and thin, which is convenient for users to carry around; the second is that the imaging quality is getting higher and higher. Optical glass with a refractive index higher than 1.95 is generally called ultra-high refractive index glass. When used in optical imaging equipment, it can greatly shorten the focal length of imaging, reduce the length required for lens imaging, and thus greatly reduce the volume of the lens. The emergence of ultra-high re...

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Problems solved by technology

However, TiO 2 If the amount added is too large, coloring will occur during the glass melting process, which will seriously reduce the light transmittance of the glass

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