Optical glass

Abstract

The invention provides optical glass. The optical glass contains the ingredients in percentage by weight: 10%-30% of B2O3, 0%-10% of SiO2, 20%-40% of La2O3, 1%-10% of WO3, 3%-15% of Nb2O5, 0%-8% of TiO2, 16%-35% of BaO, more than 0% but less than or equal to 10% of ZrO2 and more than 0% but less than or equal to 9.5% of ZnO, and is free of Gd2O3. Through reasonable ingredient design, the optical glass provided by the invention with expected index of refraction and Abbe number can be obtained by a relatively low cost; and the optical glass has excellent devitrification resistance.

Description

technical field [0001] The invention relates to an optical glass, in particular to an optical glass with a refractive index of 1.78-1.83 and an Abbe number of 36-44. Background technique [0002] In recent years, with the rapid development of digitalization and high precision of optical systems, it is necessary to reduce the number of lenses and prisms used in optical systems in photographic equipment such as digital cameras and video cameras, as well as image playback equipment such as projectors and projection TVs. The number of optical components is increasing, so the requirements for the overall light weight and miniaturization of the optical system are getting higher and higher. In the design of the optical system, high-refractive glass or aspheric lenses are widely used to achieve miniaturization, ultra-thinning and wide-angle, and it is easier to achieve chromatic aberration correction while achieving lightweight and high-performance optical systems. Therefore, The r...

AI Technical Summary

Problems solved by technology

CN102303952A discloses an optical glass with a refractive index of 1.81-1.84 and an Abbe number of 42-47, which contains 9-30% of Gd 2 o 3 , high content of Gd 2 o 3 It will reduce the devitrification resistance of the glass, and it is not good for reducing the cost of the glass

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