Optical glass and optical element

Abstract

An optical glass having a low transition temperature, high transmissivity, and good chemical stability and devitrification resistance, the refractive index of the optical glass being 1.60-1.65, and the Abbe number thereof being 62-66; the optical glass comprises the following components by weight percentage: P2O5: 30%-50%, BaO: 35%-50%, B2O3: 2%-6%, La2O3: 0%-5%, Gd2O3: 0%-5%, Al2O3: 0.1%-5%, Li2O: 0.1%-5%, MgO: 2%-10%, and CaO: 2%-10%. The present invention utilizes P2O5 as the network former of the glass, increasing the transmissivity of the glass; in addition, a large amount of BaO is an important ingredient for improving the transmissivity of the glass, while also increasing the refractive index of the glass, and improving the weathering stability of the glass.

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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