An optical glass and its glass preforms, components and instruments

Abstract

The invention discloses an optical glass, which solves the problem in the prior art in order to overcome the La 2 O 3 If the content is too high, it will affect the refractive index, dispersion, crystallization upper limit temperature and other properties, and it is a problem that the production cost of glass needs to be increased. The present invention is based on wt%, including: B 2 O 3 25~45%; La 2 O 3 30~50%; Gd 2 O 3 0~10%; Y 2 O 3 3~20%; Among them, Y 2 O 3 / (La 2 O 3 +Gd 2 O 3 ) is 0.10 to 0.60. Through reasonable optimization of composition and proportion, the present invention can reduce Gd while improving refractive index / reducing dispersion. 2 O 3 and Ta 2 O 5 The use amount of the product can reduce the cost, and effectively improve the devitrification resistance, reduce the glass transition temperature, and ensure the excellent performance such as the upper limit temperature of crystallization and chemical stability.

Description

technical field [0001] The invention relates to the field of glass, in particular to an optical glass and its preforms, components and instruments. Background technique [0002] There has recently been a rapid trend toward higher integration and functional enhancement in devices using optical systems, and there is a growing desire to reduce the weight and size of optical systems. To achieve this desire, optical designs using aspheric lenses made of high-performance glass are becoming mainstream. Typically, this glass is heated to a temperature acceptable for forming and then precision-molded to produce aspherical lenses. In particular, although the recently used large-aperture lenses are spherical lenses, these lenses are being replaced by larger-aperture aspherical lenses in order to further enhance the function. There is an increasing need for high-performance glasses for producing these lenses with high refractive index and low dispersion properties. that various B-con...

AI Technical Summary

Problems solved by technology

[0007] The object of the invention is to provide a kind of optical glass, solves the problem of overcoming La in the prior art 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 The amount of use, reduce costs, and effectively improve the resistance to devitrification, to ensure the upper limit temperature of crystallization, chemical stability and low softening point easy to mold and other excellent properties

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