Optical glass, glass preform, optical element and optical instrument

Abstract

The invention provides an optical glass. The optical glass comprises 32-49 wt% of SiO2, 2-12 wt% of B2O3, 2-12 wt% of La2O3, 20-28 wt% of Nb2O5, 1-8 wt% of ZrO2, 0.5-7 wt% of BaO, 0.5-8 wt% of Li2O and 5-20 wt% of Na2O, wherein a ratio of SiO2 / B2O3 is 9.0 or less, a ratio of SiO2 / La2O3 is 4.0-12.0, a ratio of B2O3 / La2O3 is 0.5-2.0, a ratio of (BaO+SiO2) / (Li2O+Na2O+B2O3) is 1.0-3.0, and a ratio ofNb2O5 / SiO2 is 0.3-1.5. The optical glass obtained by the reasonable component proportioning has the advantages of negative anomalous dispersion and excellent devitrification resistance.

Description

technical field [0001] The invention relates to an optical glass, in particular to an optical glass with a refractive index of 1.62-1.72 and an Abbe number of 35-42. Background technique [0002] Optical glass is an indispensable and important part of optical instruments and optoelectronic products. In recent years, with the widespread popularity of optoelectronic products such as smartphones and SLR cameras, higher requirements have been put forward for the performance of optical glass, such as requiring optical glass It has the ability to eliminate or eliminate the residual chromatic aberration of the secondary spectrum as much as possible, which requires optical glass to have negative anomalous dispersion performance. [0003] During the production or secondary molding process of optical glass, the devitrification resistance of optical glass is highly required. If the devitrification resistance of optical glass is poor, problems such as crystallization will easily occur ...

AI Technical Summary

Problems solved by technology

If the devitrification resistance of optical glass is poor, problems such as crystallization will easily occur during the production process, which will lead to devitrification of the glass and make the glass waste, especially the devitrification during the secondary pressing process will lead to the optical components formed by pressing Can not be used, resulting in waste of cost and energy

Images