glass composition

Abstract

The invention provides a glass composition, which belongs to the technical field of glass. The glass composition of the invention contains La 2 o 3 、TiO 2 、WO 3 and Nb 2 o 5 , whose composition is expressed in molar percentages, TiO 2 / (TiO 2 +WO 3 +Nb 2 o 5 ) is 0.65‑1.0, excluding 0.65, the refractive index n of the glass composition d is 1.89‑1.97, the Abbe number v d 30-37, the present invention provides a glass composition with more excellent properties such as temperature coefficient of refractive index.

Description

technical field [0001] The invention belongs to the technical field of glass, in particular to a refractive index n d is 1.89-1.97, the Abbe number v d 30-37 glass composition, and optical glass, optical preform, optical element and optical instrument formed from the glass composition. Background technique [0002] In recent years, a large number of high-refractive index optical glasses have been used in the fields of vehicle, monitoring and security, etc., and the performance of optical glass used in the fields of vehicle, security and other fields may be deteriorated due to long-term exposure to the outdoors due to changes in outdoor temperature and humidity. , leading to a decline in imaging quality, so the demand for high-refractive-index optical glass in the field of optoelectronic materials is becoming more and more urgent to improve performance requirements such as weather resistance and temperature coefficient of refraction index. [0003] Some optical glasses of p...

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Problems solved by technology

[0002] In recent years, a large number of high-refractive index optical glasses have been used in the fields of vehicle, monitoring and security, etc., and the performance of optical glass used in the fields of vehicle, security and other fields may be deteriorated due to long-term exposure to the outdoors due to changes in outdoor temperature and humidity. , leading to a decline in imaging quality, so the demand for high-refractive index optical glass in the field of optoelectronic materials is becoming more and more urgent for the performance requirements such as weather resistance and temperature coefficient of refraction index.

[0003] Some optical glasses of prior art by adding Gd in the component 2 o 3 and / or Ta 2 o 5 , has reached a refractive index above 1.89, and obtained ideal optical constants, but Gd 2 o 3 and / or Ta 2 o 5 The components not only increase the cost of the glass, but also make the stability of the glass worse, and the weather resistance and acid stability will be adversely affected, thereby affecting the imaging quality of the glass

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