Optical glass with low Abbe number

Abstract

An optical glass with low Abbe number comprises the following components by weight: 4-15.0% of SiO2, 15-28% of B203, 13-24.4% of La2O3, 10-30% of Gd2O3, 1-20% of GeO2, 1-10% of Ta2O5, 0-15% of Y2O3, and the total amount of 0.1-6% of Li2O, Na2O and K2O, wherein the Li2O is more than 2%. The optical glass with low Abbe number has high visible light transmittance which is about 2% higher than the glass in the prior art, and is clarified and clear in appearance, and the visible light spectrum transmittance of the optical glass is significantly higher. The glass has chemical stability and better temperature stability after annealing.

Description

technical field [0001] The invention relates to a low Abbe number optical glass. Background technique [0002] Optical glass is a glass material used to manufacture lenses, prisms, mirrors and windows in optical instruments or mechanical systems. Optical glass has good light transmission performance. It has a high refractive index and is widely used in the manufacture of optical instruments such as spectacle lenses, cameras, telescopes, microscopes and lenses. With the advancement of science and technology and the upgrading of digital products, the demand for optical glass is also increasing, and higher requirements are placed on the performance of optical glass. [0003] Optical glass with high refractive index and low dispersion is widely used in current imaging devices, for example: a pair of lenses formed of high refractive index and low dispersion glass can correct chromatic aberration and miniaturize the optical system. Therefore, high refractive index and low dispe...

AI Technical Summary

Problems solved by technology

[0004] However, there are many deficiencies or defects in the high refractive index and low dispersion optical glass disclosed in the prior art, for example: patent document CN102295409A discloses a high refractive index, low dispersion optical glass, the refractive index nd is 1.86-1.89, but the Ta2O5 content It is 5wt%-12.9wt%. The reason why this high refractive index and low dispersion glass contains a large amount of Ta2O5 is because for the high refractive index and low dispersion optical glass with a refractive index nd greater than or equal to 1.75, in order to maintain a higher refractive index, But Ta2O5 is an expensive rare earth element, so the above-mentioned optical glass has a high cost because of the high content of Ta2O5. At the same time, Gd2O3 is an important component to increase the refractive index, which also leads to a refractive index nd of 1.86-1.89 and an Abbe number. The cost of high refractive index and low dispersion optical glass with v d of 38.5-42 is rising