Optical glass and optical component

Abstract

The invention provides optical glass. The refractive index of the optical glass is 1.78-1.83, and the Abbe number of the optical glass is 48-53. Cations of the optical glass comprise, by weight, higher than 0 but lower than or equal to 15% of Si<4+>, higher than 0 but lower than or equal to 20% of B<3+>, 42-58% of La<3+>, 18-33% of Gd<3+>, 1-15% of Y<3+>, higher than 0 but lower than or equal to 10% of Ta<5+> and 0-10% of Zr<4+>, and a Si<4+> / B<3+> ratio is 0.5-1; anions of the optical glass comprise O<2-> and F<->, and a F<-> / O<2-> ratio is higher than 0 but is lower than or equal to 0.3. The optical glass has the advantages that components of the optical glass are reasonably designed, appropriate quantities of rare earth ions La<3+>, Gd<3+> and Y<3+> and a small quantity of F<-> are introduced into the optical glass, accordingly, chromatic dispersion of glass can be lowered, and the high-refraction optical glass with low chromatic dispersion characteristics can be obtained and is applicable to high-quality optical components.

Description

technical field [0001] The invention relates to an optical glass, in particular to an optical glass with high refraction and low dispersion, as well as a preform and an optical element formed from the glass. Background technique [0002] The lens formed by the high refraction and low dispersion optical glass can be combined with the high refraction and high dispersion lens to eliminate the chromatic aberration of the optical system, so that the optical system is more compact and has better performance. Therefore, the market demand for high-refraction and low-dispersion glass with a refractive index of 1.78-1.83 and an Abbe number of 48-53 will increase. [0003] For glasses with high refraction and low dispersion, the dispersion becomes smaller while maintaining a high refractive index. The above-mentioned glasses are in demand in the market, but such "extreme" glasses are rare. The disclosed optical glass of CN1377847 contains a large amount of Nb 2 o 5 , and its dispers...

AI Technical Summary

Problems solved by technology

[0003] For glasses with high refraction and low dispersion, the dispersion becomes smaller while maintaining a high refractive index. The above-mentioned glasses are in demand in the market, but such "extreme" glasses are rare

The disclosed optical glass of CN1377847 contains a large amount of Nb 2 o 5 , and its dispersion is still high, which cannot meet the current requirements for high refraction and low dispersion glass

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