High-refraction and high- dispersion optical glass and method of manufacture

Abstract

The invention provides a high-refraction and high-dispersion optical glass which comprises 4 percent to 16 percent of B2O3, 0 percent to 15 percent of SiO2, 0 percent to 10 percent of GeO2, 20 percent to 55 percent of La2O3, 0 percent to 20 percent of Gd2 O3, 8 percent to 20 percent of TiO2, 0 percent to 30 percent of Nb2O5, 0 percent to 8 percent of WO3, 0 percent to 20 percent of BaO, 1 percent to 10 percent of ZrO2, 0 percent to 18 percent of Ta2O5, 0 percent to 8 percent of Y2O3, 0 percent to 10 percent of Yb2O3, 0 percent to 15 percent of Lu2O3, 0 percent to 20 percent of Bi2O3, 0 percent to 1 percent of Li2O, etc. The optical glass of the invention contains no environmentally-harmful substances such as lead, arsenic, cadmium, etc., and Nd is more than or equal to 1.95 while Vd is less than or equal to 35; in addition, the L.T of the optical glass is lower than 1300 DEG C and the optical glass is applicable to the industrial mass production.

Description

technical field [0001] The invention relates to a high-refraction high-dispersion optical glass with a refractive index Nd≥1.95 and an Abbe number Vd≤35 and a manufacturing method thereof Background technique [0002] In recent years, various optoelectronic products such as digital cameras, digital video cameras, and CCTV (monitors) are increasingly pursuing compactness, portability, multi-function and high performance, so the demand for high-refractive-index optical glass used in imaging lenses is increasing. Traditional high-refractive optical glass uses a large amount of PbO to increase the refractive index of the glass, but lead is harmful to the environment, and the chemical stability of glass containing a large amount of PbO is poor. Therefore, except for special applications, lead is generally not used in optical glass. [0003] USP4439531 and USP4584279 respectively disclose two kinds of high refractive index optical glasses, but the melting temperature of these two ...

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Problems solved by technology

[0004] Japanese Patent Application No. 9-278480 discloses a B 2 o 3 -GeO 2 -La 2 o 3 -TiO 2 -ZrO 2 -Nb 2 o 5 The high refractive index glass of the system, but the glass contains a large amount of GeO 2 , GeO 2 Is an expensive raw material, so its product is not economical

[0005] CN200610149827.4 discloses a B 2 o 3 -GeO 2 The high refractive index glass of the system, which also contains a large amount of expensive GeO 2 , the economy is not strong

[0006] The optical glass disclosed in CN200610139840.1 requires heat treatment near the transition temperature to reduce the coloring of the glass, which increases the production process and may cause inconsistent color inside and outside the glass during heat treatment

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