Lanthanide optical glass and glass prefabricated part, element and instrument thereof

Abstract

The invention discloses lanthanide optical glass and a prefabricated part, an element and an instrument thereof, and solves the problem that the production cost of the glass needs to be increased in order to overcome the influence of overhigh La2O3 content on the performances such as refractive index, dispersion, crystallization ceiling temperature and the like in the prior art. The lanthanide optical glass comprises the following components in percentage by weight: 0-10% of SiO2, 25-45% of B2O3, 30-50% of La2O3, 0-10% of Gd2O3, 3-20% of Y2O3, 0-10% of ZnO and 0-8% of R2O. According to the invention, through reasonable optimization of the composition and the proportion, the usage amounts of Gd2O3 and Ta2O5 can be reduced while the refractive index is improved / the dispersion is reduced, thecost is reduced, the devitrification resistance is effectively improved, the glass transition temperature is reduced, and the excellence of performances such as crystallization ceiling temperature, chemical stability and the like is ensured.

Description

technical field [0001] The invention relates to the field of glass, in particular to lanthanide optical glass and its preform, component and instrument. 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 and low dispersion chara...

AI Technical Summary

Problems solved by technology

[0007] The object of the invention is to provide lanthanide 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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