Optical glass, glass preforms and optical components

Abstract

The invention provides an optical glass, a glass preform and an optical element, which belong to the field of glass technology. The optical glass component of the invention is represented by weight percentage, and contains: SiO 2 : 5‑12%; B 2 o 3 : 8‑15%; Y 2 o 3 : 5‑15%; ZrO 2 : 1‑10%; ZnO: 0.2‑10%; La 2 o 3 : 40‑55%; TiO 2 +WO 3 +Nb 2 o 5 : 5‑20%, of which: TiO 2 / (TiO 2 +WO 3 +Nb 2 o 5 ) is 0.38-1.0, the optical glass of the present invention has excellent performances such as weather resistance and temperature coefficient of refractive index.

Description

technical field [0001] The invention belongs to the technical field of glass, and in particular relates to an optical glass with a refractive index above 1.90 and an Abbe number above 30, as well as a glass preform and an optical element formed from the optical glass. Background technique [0002] Optical components and optical instruments are developing rapidly in terms of miniaturization, integration and high precision, which puts forward higher requirements for the performance of optical glass used in optical instruments and optical components of equipment, especially in recent years, vehicle, monitoring security A large number of high-refractive-index optical glasses are used in fields such as automotive and security. Due to long-term exposure to outdoors, the performance of the glass may deteriorate due to changes in outdoor temperature and humidity, resulting in a decline in imaging quality. Therefore, in the field of optoelectronic materials, there is an increasingly ...

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Problems solved by technology

[0003] Usually the refractive index n d Above 1.90, the Abbe number v d Ta, Gd and other elements are contained in the composition of high refractive index optical glass above 30, but the raw materials of Ta and Gd are expensive, which is not conducive to obtaining cost-effective materials

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