Optical glass with low softening point and its glass preform, component and instrument

Abstract

The invention discloses a low softening point optical glass and its prefabricated parts, components and instruments, which solves the problems in the prior art in order to overcome La 2 o 3 If the content is too high, it will affect the refractive index, dispersion, upper limit temperature of crystallization and other properties, which needs to increase the production cost of glass. According to wt%, the present invention includes: B 2 o 3 25~45%; La 2 o 3 30-50%; Gd 2 o 3 0~10%; Y 2 o 3 3~20%; Li 2 O 0~8%; wherein, the Li 2 O and Gd 2 o 3 The ratio of 0.1 or more. The present invention can increase the refractive index / reduce the dispersion and reduce the Gd through reasonable optimization of composition and ratio 2 o 3 and Ta 2 o 5 usage, reduce cost, and can effectively reduce the glass transition temperature. At the same time, effectively improve the glass transmittance, reduce the degree of coloring, and reduce the λ of the glass 80 Control below 390nm, λ 5 Control below 300nm.

Description

technical field [0001] The invention relates to the field of glass, in particular to a low softening point optical glass and its prefabricated parts, components and instruments. Background technique [0002] Recently, there is a rapid development trend towards higher integration and function improvement in devices using optical systems, and it is increasingly desired to reduce the weight and size of optical systems. To realize this desire, optical designs using aspheric lenses made of high-performance glass are becoming mainstream. Usually, this glass is heated to a temperature acceptable for forming, and then formed by precision molding to produce an aspheric lens. In particular, although recently used large-aperture lenses are spherical lenses, these lenses are being replaced by larger-aperture aspherical lenses in order to further enhance functions. There is an increasing need for high performance glasses for the manufacture of these lenses to have high refractive index...

AI Technical Summary

Problems solved by technology

[0007] The object of the invention is to provide a kind of low softening point optical glass, solves in the prior art in order to overcome La 2 o 3 If the content is too high, it will affect the performance of refractive index, dispersion, crystallization upper limit temperature, etc., which needs to increase the cost of glass production; through reasonable optimization of composition and proportion, it can increase the refractive index / reduce dispersion while reducing Gd 2 o 3 and Ta 2 o 5 usage, reduce cost, and effectively reduce the glass transition temperature. At the same time, effectively improve the glass transmittance, reduce the coloring degree, and reduce the λ of the glass 80 Control below 390nm, λ 5 Control below 300nm

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