Optical glass and optical element

Abstract

The invention provides optical glass with a high refractive index, high dispersion, small relative partial dispersion Pg,F, high transmittance and good chemical stability, and an optical element. The negative ion of the optical glass is O <2->; and the positive ions of the optical glass comprise, by weight, 12 to 25% of Si<4+>, 58 to 75% of Nb<5+>, W<6+> and Zr<4+>, 8 to 25% of Li<+>, Na<+> and K<+>, and 10% or less Ba<2+>. Through reasonable design of the above components, the optical glass has a refractive index of 1.81 to 1.89 and an Abbe number of 20 to 29, the Pg,F of the optical glass is in a range of 0.5956 to 0.6199, and when the transmittance of the optical glass reaches 70%, a corresponding wavelength lambda70 is below 450 nm; so the optical glass is applicable to high-quality optical elements.

Description

technical field [0001] The invention relates to an optical glass and an optical element. The optical glass has a refractive index (nd) of 1.81 to 1.89 and an Abbe number (νd) of 20 to 29, in particular to a kind of high refraction and high dispersion, relative partial dispersion Pg , Optical glass and optical elements with small F, high transmittance and good chemical stability. Background technique [0002] High-refraction and high-dispersion optical glass is a very important part of optical instruments and optoelectronic products. In recent years, with the widespread popularity of optoelectronic products such as smart phones and SLR cameras, higher requirements have been put forward for the performance of this type of optical glass. That is to reduce its Pg, F, so as to better improve the chromatic aberration, thereby further improving the imaging quality of the optical lens. [0003] Currently known to use SiO 2 -TiO 2 -Nb 2 o 5 -Na 2 Optical glass with high refract...

AI Technical Summary

Problems solved by technology

The glass disclosed in JP2004-161598 has the problem of easy devitrification, and the composition may also contain GeO 2 This expensive component will make the price of glass high, which is not conducive to industrial production

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