Optical glass

Abstract

The invention provides lanthanum borosilicate optical glass taking SiO2, B2O3, La2O3, Nb2O5, ZrO2 and TiO2 as primary ingredients, wherein the optical glass does not contain substances harmful to the environment, for example, lead, thorium, cadmium, arsenic, fluorine and the like, and does not contain valuable materials such as Ta2O5, Gd2O3 and the like; the refractive index (nd) of the optical glass is 1.75-1.77; the abbe number (vd) is 39-41; and the optical glass has the characteristics of being good in crystallization properties, good in pigmentation degree, and suitable for production. Based on the weight percent of the compound, the optical glass contains 8-14% of SiO2, 19-26% of B2O3, 18-23% of La2O3, 0-5% of Y2O3, 2-5% of ZrO2, 5-10% of Nb2O5, 20-25% of BaO, 0-4% of SrO, 0-5% of CaO, 0-2% of ZnO, 0-3% of WO3, 1-5% of TiO2, and 0-1% of Sb2O3, wherein the sum of the contents of La2O3 and Y2O3 is 19-25%; and the sum of the contents of BaO and CaO and SrO is 22-27%.

Description

technical field [0001] The invention relates to an optical glass, in particular to a borosilicate lanthanide optical glass with a refractive index (nd) between 1.75-1.77 and an Abbe number (vd) between 39-41. Background technique [0002] With the fierce competition and development of the optoelectronic product market, manufacturing optical materials with high yield and low cost is the goal of every optical material manufacturer. On the other hand, in recent years, digital cameras, digital video cameras, camera phones, etc. have become increasingly popular, and the degree of integration and functions of mechanical devices used in optical systems have increased rapidly. In this case, the optical system is required to achieve higher accuracy, resolution, and reduce the weight and size of the optical system. In order to meet the high-pixel, small and light requirements of high-end digital products, the demand for borosilicate lanthanide optical glass with advantages such as hi...

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