Optical glass, optical prefabricated member, optical element and optical instrument

Abstract

The invention discloses optical glass. The optical glass comprises 20-44% of SiO2, 6-15% of B2O3, 0-9% of TiO2, 1-10% of ZnO, 45-60% of RO, 0-9% of Al2O3 and 0-3% of Sb2O3, wherein RO is one or more selected from MgO, CaO, SrO and BaO. The invention provides the environment-friendly optical glass with a small stress optical coefficient and a low refractive index temperature coefficient, an opticalprefabricated member, an optical element and an optical instrument.

Description

technical field [0001] The present invention relates to an optical glass, in particular, the present invention relates to an optical glass and an optical preform, an optical element and an optical instrument made of the optical glass. Background technique [0002] The stress optical coefficient is also called the photoelastic coefficient. The smaller the value is, the easier it is to eliminate the temporary stress of the glass, which is more conducive to imaging. At present, most optical glass has a large stress optical coefficient, the thermal stability of the glass is not good under strong light, the temperature rises rapidly, and stress is easily generated inside the glass, thereby reducing the image quality of the image, or even no image. [0003] Moreover, in recent years, a large number of optical glasses used in automotive, security and other fields have been exposed outdoors for a long time. At present, the temperature coefficient of refractive index and stress optic...

AI Technical Summary

Problems solved by technology

At present, most optical glass has a large stress optical coefficient, the thermal stability of the glass is not good under strong light, the temperature rises quickly, and the stress is easily generated inside the glass, thereby reducing the image quality of the image, or even no image.

[0003] Moreover, in recent years, a large number of optical glasses used in automotive, security and other fields have been exposed outdoors for a long time, and the current fluorophosphate glass has a high temperature coefficient of refraction index and stress optical coefficient, and poor thermal stability. It is not suitable for outdoor high temperature, and especially In the case of high-power light applications, the poor thermal properties of the glass will cause high energy density to enter the glass and cause the glass to burst. Even if there is no burst, the internal structure of the glass will be changed and the image quality will be reduced.

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