Low-softening-point optical glass as well as glass prefabricated part thereof, element and apparatus

Abstract

The invention discloses low-softening-point optical glass as well as a prefabricated part thereof, an element and an apparatus, and solves the problem that glass production cost needs to be increasedfor overcoming influences caused by too high La2O3 content on performances such as a refractive index, chromatic dispersion and a crystallization upper limit temperature. The low-softening-point optical glass is prepared from the following components in percentage by weight (wt%): 25-45% of B2O3, 30-50% of La2O3, 0-10% of Gd2O3, 3-20% of Y2O3, and 0-8% of Li2O, wherein a ratio of Li2O to Gd2O3 is0.1 or above. According to the invention, composition and a proportion are reasonably optimized, so that usage amount of Gd2O3 and Ta2O5 is reduced while the refractive index can be increased or chromatic dispersion can be reduced; the cost is reduced; and a glass transition temperature can be effectively reduced; and meanwhile, glass transmittance is effectively increased; pigmentation degree isreduced; and lambada80 of the glass is controlled to be 390 nm or below, and lambada5 is controlled to be 300 nm or below.

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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