Optical glass with negative anomalous dispersion

Abstract

The invention is an optical glass equipped with negatively anomalous dispersion, which belongs to the technical field of optical glass equipped with negatively anomalous dispersion and high refractive index, and resolves the problem of larger abbe coefficient and lower refractive index of the existing optical glass. The invention is composed of the following components, Sb2O3, SiO2, B2O3, Al2O3, Ta2O5, K2O, Na2O, Nb2O5, TiO2, MgO and ZrO2, wherein the contents of the above components are respectively 50-75%, 5-10%, 8-15%, 0-5%, 0-5%, 0-5%, 0-5%, 1-10%, 0-10%, 0-10%, 0-5%. The invention is equipped with bigger negatively anomalous dispersion value (PgF), high refractive index (nd) and smaller abbe coefficient (vd), wherein the refractive index value is with the range of 1.78-1.81, the abbe coefficient is with the range of 23-25, the negatively anomalous dispersion is an optical constant with the range of 0.598-0.612, and the invention is equipped with the effect of correcting the second order spectrum, perfect stability, and has no harmful compositions as plumbum, arsenium and the like, and no high price oxide .

Description

technical field [0001] The invention relates to an optical glass with relatively large negative anomalous dispersion value. Background technique [0002] In an optical lens system, two types of optical glass with different Abbe numbers are usually combined, even without a large anomalous dispersion glass, the chromatic aberration of the two colors of light can be eliminated. With respect to light of other colors, however, there is also a residual chromatic aberration representing the second spectrum (secondary spectrum). When designing optical lens systems, it is desirable to correct or eliminate secondary spectra. This is accomplished by combining an optical lens with large positive anomalous dispersion with an optical lens with negative anomalous dispersion. [0003] No glass having such a high refractive index and negative anomalous dispersion has been found in the art so far. A group of SiO with negative anomalous dispersion disclosed in Japanese Patent No. 48-74516 ...

AI Technical Summary

Problems solved by technology

A group of SiO with negative anomalous dispersion disclosed in Japanese Patent No. 48-74516 2 -B 2 o 3 -Al 2 o 3 -PbO-Sb 2 o 3 Glass, but does not have high refractive index and small Abbe value, but also contains a large amount of harmful components PbO, which will bring pollution to the environment

For a glass that does not contain PbO and has negative anomalous dispersion, a kind of anomalous dispersion glass disclosed in German early patent 2137748 contains B 2 o 3 , Sb 2 o 3 , Li 2 In addition to O, it also contains GeO 2 、 Ta 2 o 5 such as expensive oxides, the glass is uneconomical to manufacture

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