Optical glass

Abstract

The invention provides optical glass. The optical glass comprises the following components in percentage by weight: 25-45% of SiO2; 2-15% of ZrO2; 35-60% of Nb2O5; 1-10% of Li2O; 2-15% of Na2O; and 0-10% of k2O. According to the optical glass of the invention, the optical glass has excellent crystallization resistance by containing a proper amount of SiO2, alkali metal oxide and other components;the optical glass with high refractive index and high dispersion is obtained by containing Nb2O5, ZrO2 and other oxide components with high refractive index; through reasonable component design, the optical glass has low relative partial dispersion.

Description

Technical field[0001]The invention relates to an optical glass, in particular to a high-refraction and high-dispersion optical glass with excellent crystallization resistance.Background technique[0002]In the long focal length, large field of view, and high-precision optical system, the secondary spectrum is the main factor affecting the imaging quality. Correcting the secondary spectrum is a prominent problem in the design of long focal length optical system, and it is also a difficult problem to solve. The correction of the secondary spectrum in the optical system depends to a large extent on the choice of glass material. High refraction, high dispersion, and low relative partial dispersion (Pg,F ) Glass is beneficial to eliminate secondary spectrum when applied to coupling lens, simplify and optimize optical system, and improve imaging quality.[0003]Secondary pressing has the advantages of low production cost, low production difficulty, and convenient mass production, and is widel...

AI Technical Summary

Problems solved by technology

This production method often needs to heat the glass to 100-200°C above the transition temperature. At this time, the glass already has a certain fluidity. The risk of crystallization scrapping

CN104583142A discloses an optical glass with relatively low relative partial dispersion, the components of which contain more than 5.0% and less than 55.0% of B in terms of mass % 2 o 3 and more than 15% and less than 60% of rare earth oxides, the optical glass has poor anti-devitrification performance, and there is a greater risk of devitrification during the second pressing of the glass

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