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

Abstract

The invention discloses colorless optical glass, a glass prefabricated part thereof, an element and an instrument. The problem is solved that in the prior art, in order to overcome the influence of high La2O3 content on refractive index, chromatic dispersion, crystallization upper limit temperature and other performance, the production cost of glass needs to be increased. The glass comprises, by wt%, 25-45t% of B2O3, 30-50t% of La2O3, 0-10t% of Gd2O3 and 3-20t% of Y2O3. The specific value of Gd2O3 to La2O3 is 0.01-0.3. According to the optical glass, through reasonable optimization of composition and matching, the refractive index is increased, the chromatic dispersion is reduced, the application amount of Gd2O3 and Ta2O5 is reduced, the cost is reduced, it is effectively guaranteed that the crystallization upper limit temperature of the glass is not increased, the glass formation performance is better, glass bubbles are not easily generated in the founding process, and good optical performance and formation performance are also guaranteed.

Description

technical field [0001] The invention relates to the field of glass, in particular to a colorless 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 and low d...

AI Technical Summary

Problems solved by technology

[0007] The object of the invention is to provide a kind of colorless optical glass, solves the problem in the prior art 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 The amount of use, reduce costs, and ensure that the upper limit temperature of crystallization of the glass does not rise, the glass forming property is better, glass bubbles are not easy to be generated in the melting process, and good optical properties and molding properties are also guaranteed.

Images