Optical Glass and Optical Components

Abstract

The invention provides an optical glass with low transition temperature, high transmittance, good chemical stability and devitrification resistance, the refractive index is 1.60-1.65, and the Abbe number is 62-66. Optical glass, the composition of which contains by weight percent: P 2 o 5 : 30~50%, BaO: 35~50%, B 2 o 3 : 2~6%, La 2 o 3 : 0~5%, Gd 2 o 3 : 0~5%, Al 2 o 3 : 0.1~5%, Li 2 O: 0.1-5%, MgO: 2-10%, CaO: 2-10%. The present invention uses P 2 o 5 As a network generator of glass, it endows glass with higher transmittance. A large amount of BaO is an important component to improve glass transmittance. At the same time, it can increase the refractive index of glass, improve the weather resistance stability of glass, and have a lower transition temperature. , and good chemical stability and devitrification resistance.

Description

technical field [0001] The invention relates to an optical glass, in particular to a refractive index (n d ) is 1.60~1.65, Abbe number (υ d ) is 62-66 optical glass, and glass preforms, optical elements and optical instruments made of the optical glass. Background technique [0002] With the continuous development of digital cameras, digital video cameras and camera phones with better imaging quality and higher definition, aspheric lenses are used more and more widely. For this reason, glass with medium refractive index, low dispersion and high transmittance It is more and more favored by the market. At the same time, in order to reduce processing difficulty and production cost, precision molding technology has become the first choice for optical glass to manufacture optical lenses. However, if the obtained optical glass is suitable for precision molding, it must have a lower transition temperature, which also affects optical Glass developers put forward higher requiremen...

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Problems solved by technology

[0003] The Chinese patent application number 201010554499.2 discloses an optical glass whose glass transition temperature is about 600°C, which is not conducive to precision molding

[0004] The optical glass described in Japanese Patent Laid-Open No. 2004-217513 contains a lot of Nb 2 o 5 、 Bi 2 o 3 、WO 3 , there is a problem of low glass transmittance

[0005] Chinese patent application number 201010299001.2 discloses an optical glass whose composition contains a large amount of B 2 o 3 , which will increase the volatility of the glass during melting, and the chemical stability and devitrification resistance of the glass will be insufficient

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