Optical glass, its preparation method and optical element

Abstract

The invention provides an optical glass, a preparation method thereof and an optical element. The optical glass contains in mole percent: B 2 o 3 : 50.1%~65.0%; La 2 o 3 : 15.0%~30.0%; Nb 2 o 5 : 1% ~ 8%; Y 2 o 3 : 3% ~ 8%; ZnO: 0.01% ~ 8%; Gd 2 o 3 : 0% ~ 8%; TiO 2 : 0% ~ 5%; ZrO 2 : 0%~10%; WO 3 : 0% to 2%; the refractive index n of the optical glass d 1.85 or more, the Abbe number υ d 39-42; the optical glass does not contain Ta 2 o 5 . The optical glass of the invention has good transmission performance, excellent stability, excellent water resistance and devitrification resistance, is a high-refraction and low-dispersion optical glass with abnormal dispersion, and has excellent process performance.

Description

technical field [0001] The invention relates to an optical glass, a preparation method thereof and an optical element, belonging to the technical field of optical glass. Background technique [0002] In recent years, with the rapid progress and development of optoelectronic technology, various optical devices such as digital cameras, video cameras, projectors, and projection TVs have become increasingly digital and high-definition. In particular, high-end smartphones already have high-resolution camera and photography functions, and are thin, light and compact, meeting people's needs for taking high-definition photos and recording small videos to share with friends. The market sales are increasing year by year. These optical products have increasingly strong requirements for reducing the number and weight of optical components such as lenses and prisms used in the optical system, making the overall light weight and miniaturization of the optical system, and at the same time ...

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Problems solved by technology

n of the optical glass d 1.80~1.92, ν d 30-45, but the λ80 of the glass is below 500nm, and the short-wavelength transmission decreases

[0005] The optical glass disclosed in patent application CN104803600A, n d 1.83~1.92, ν d It is 36-45, and its composition contains 10-40% Gd by weight 2 o 3 , 0%~13% Ta 2 o 5 , the liquidus temperature is below 1300, in order to obtain low-cost glass with excellent devitrification resistance, the expensive raw material Ta 2 o 5 The dosage, but increased the Gd 2 o 3 content, but Gd 2 o 3 It is also a more expensive raw material in rare earths, so excess Gd 2 o 3 It will also increase the cost of glass

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