Optical glass

Abstract

The invention discloses optical glass which comprises the following components in percentage by weight: 28%-42% of SiO2, 5%-18% of ZnO, 26%-48% of RO, 0-10% of TiO2, and 0-10% of ZrO2, wherein RO is one or more selected from MgO, CaO, SrO and BaO. According to the invention, the formula and the proportioning relationship are optimized, without adding other expensive metals, the content of SiO2 isremarkably reduced, the proportioning relationship of all the components is optimized, the moisture resistance stability, weather resistance and acid resistance of the optical glass are remarkably improved, and particularly, the moisture resistance stability and weather resistance of the optical glass can reach first-class standards; meanwhile, the optical glass also has a good optical constant.

Description

technical field [0001] The invention relates to the technical field of environmental protection optical glass, in particular, the invention relates to optical glass and optical preforms, optical elements and optical instruments made of the optical glass. Background technique [0002] The lenses that make up the optical system usually have spherical lenses and aspheric lenses. A spherical lens has a constant curvature from the center to the edge of the lens, while an aspheric lens has a curvature that changes continuously from the center to the edge; as in a photographic lens , in order to ensure optical performance, numerous "aberrations" must be corrected. If only spherical lenses are used for correction, the corresponding lens technology requires many lens combinations. Aspherical lenses can improve optical quality, reduce optical components, and reduce design costs. Compared with spherical lenses, aspheric lenses have unique advantages, so they are widely used in optical ...

AI Technical Summary

Problems solved by technology

Optical glass for precision stamping usually has the disadvantage of poor chemical durability, which is not conducive to subsequent processing and even affects the quality of the glass

For optical glass with poor chemical durability, in the subsequent polishing and cleaning process, measures such as protective coating need to be taken, and the yield rate is low, which increases the process and cost

If the weather resistance level of the glass is low, the surface of the polished glass is easily corroded by water vapor in the air and scrapped during cleaning, drying, transportation, etc.

[0004] For example, patent CN200610021577.6 provides an environmentally friendly optical glass. By adjusting the component distribution ratio, an optical glass with ideal optical constants can be obtained without introducing elements such as Pb, As, and Cd that are harmful to the environment. However, Little contribution to the chemical resistance and durability of optical glass, especially the weather resistance

[0005] For example, patent CN108975687A provides an optical glass with high SiO 2 Content (50% ~ 65%) optical glass formula, so the meltability is poor, and in order to ensure good meltability, it is necessary to increase the melting temperature, which is not conducive to improving the light transmittance of the glass

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