Optical glass, glass preform, optical element and optical instrument

Abstract

The invention provides an optical glass, which comprises, by weight, 0.1-1.5% of WO3 / ZnO, more than 0.5% of WO3 / Nb2O5, 0.25-1.3% of ZnO / La2O3, 0.45-2.75% of ZnO / B2O3, 0.1-1.0% of WO3 / (SiO2+B2O3), 5-40% of Nb2O5+TiO2+WO3, and 0.5-1.0% of La2O3 / (La2O3+Gd2O3+Y2O3). According to the present invention, through the reasonable component design, the obtained optical glass has a large positive refractive index temperature coefficient in the case of the obtaining of desired refractive index, desired Abbe number and other desired optical performances.

Description

technical field [0001] The invention relates to an optical glass, in particular to an optical glass with a refractive index of 1.74-1.86 and an Abbe number of 35-48, as well as glass preforms, optical elements and optical instruments made of the optical glass. Background technique [0002] In the prior art, glass with a refractive index of 1.74-1.86 and an Abbe number of 35-48 belongs to high refractive index glass, and is widely used in various lenses. In recent years, vehicle-mounted lens equipment has developed vigorously. Compared with general photography and other applications, the quality of vehicle-mounted lenses is closely related to safety. Therefore, vehicle-mounted lenses place more emphasis on the reliability of equipment, especially when exposed outside the vehicle body, it needs to withstand harsh conditions. Working environment, such as reversing camera, front-view camera, rear-view mirror auxiliary camera, etc. [0003] The principle of designing a vehicle-m...

AI Technical Summary

Problems solved by technology

However, although the reliability of the fixed-focus lens is very good, its fatal weakness is that it is very difficult to correct the temperature drift of the lens when it is applied in the car.

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