Optical glass

Abstract

The invention provides optical glass which is excellent in interior quality and has excellent transmittance and anti-devitrification property. The optical glass comprises the components in percentages by weight: positive ion: 8-25% of P<5+>, 5-20% of Al<3+>, 20-50% of Ba<2+>, 15-40% of Sr<2+>, 0.5-8% of Mg<2+>, 1-10% of Ca<2+>, 0-10% of La<3+>, 0-10% of Gd<3+> and 0-10% of Y<3+>; negative ions: 40-90% of F<-> and 10-60% of O<2->. Through a reasonable formula design, the optical glass has the excellent interior equality, transmittance and anti-devitrification property while has the refractive index of 1.48-1.58 and the abbe number of 75-83.

Description

technical field [0001] The invention relates to an optical glass, in particular to an optical glass with low refractive index and low dispersion, a glass preform and an optical element. Background technique [0002] For optical glass, the refractive index, Abbe number, and transmittance are its core optical characteristics. The refractive index and Abbe number determine the basic functions of glass. Optical glass with a refractive index of 1.48-1.58 and an Abbe number of 75-83 belongs to low refractive index and low dispersion optical glass. The application of this kind of high-performance glass in optical systems It can effectively eliminate secondary chromatic aberration and improve image quality. [0003] In addition to the optical properties that need to be set, optical glass must also have excellent internal quality, such as streaks, bubbles, and inclusions. In some cases, the quality of the glass depends on the composition of the glass. Optical glass with a large amo...

AI Technical Summary

Problems solved by technology

[0004] CN1854100B discloses an optical glass with a refractive index of 1.40-1.58 and an Abbe number of 67-90, which contains 1-10% mole of Li + , during the high-temperature melting process, the Li in the glass component + It is easy to corrode platinum or platinum alloy utensils, resulting in more platinum-containing foreign matter in the finished glass, resulting in a decline in the quality of the glass

At the same time, Li + When glass is used for precision molding, there is a risk of blurring the surface of glass components, because the mold is generally coated with a release agent containing carbon elements, and the Li in the glass component + It is easy to react with the carbon element in the release agent to produce a rough opaque film on the surface of the glass element

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