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Optical glass with high refractive index

A technology of optical glass and high refractive index, applied in the field of optical glass, can solve the problems of no transition temperature, low or no content, low or no, etc.

Inactive Publication Date: 2008-07-09
HUBEI NEW HUAGUANG NEW INFORMATION MATERIALS CO LTD
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  • Application Information

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Problems solved by technology

Publication No. CN1524815A Chinese Invention Patent Application Publication has announced a SiO 2 -B 2 o 3 -La 2 o 3 -Nb 2 o 5 -TiO 2 Add BaO, TiO to the system 2 etc. to achieve high refractive index, but the content of ZnO in the composition is low, WO 3 Very low or none, Li 2 O content is very low or no, belongs to ordinary high refractive index glass, does not have transition temperature (T g ) low characteristic

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Embodiment Construction

[0024] The present invention provides 5 examples and 3 existing formula comparison examples of high refractive index glass. Example 1 to Example 5, Comparative Example a to Comparative Example c glass composition (weight percentage), optical constant refractive index (n d ), dispersion coefficient (v d ), transition temperature (T g ), coloring degree (λ 70 / λ 5 ) And the upper limit of crystallization temperature (L T ) Is listed in Table 1.

[0025] The so-called crystallization test is to put 500g of the mixed glass raw materials into a 300cc platinum pot, and according to the difficulty of the solubility of each sample, use an electric furnace to smelt at 1200~1300℃ for 3 hours. The smelting process is stirred and defoamed The glass is uniform, and then the temperature is lowered. Then, each sample is kept at a temperature in the range of 1150°C to 1040°C every 10°C for 1 hour and then taken out. Finally, observe whether there is crystallization with a microscope to determine ...

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Abstract

The invention is an optical glass with high refractive index, which belongs to the technical field of optical glass. The invention mainly resolves the problems that the refractive index of the exsisting optical glass is not high enough or the transforming temperature is not low enough though the refractive index is high enough. The common glass of the invention is characterized in that the invention has the following weight percentage of oxide, 0-5% SiO2, 15-30% B2O3, 0-3% Al2O3, 20-40% La2O3, 0-6% Y2O3, 0-10% Gd2O3, 0-6% Yb2O3, 1-10% TiO2, 3-10% ZrO2, 10-30% Nb2O5, 0-20% Ta2O3, 1-10% WO3, 1-25% ZnO, 0-6% CaO, 0-3% Li2O, 0-0.5% Sb2O3, the glass with low transforming temperature is characterized in that apart from the components of 1-5% WO3 and 8-25% ZnO, the rest components are the same as the above scheme. The refractive index (nd) of the invention is between 1.89-1.91, and the abbe coefficient (vd) is with the range of 30-32. The invention is further equipped with a lower transforming temperature (Tg), and is mainly applied for small size lens glass which needs high refractive index.

Description

Technical field [0001] The invention belongs to the technical field of optical glass, and specifically relates to a refractive index (n d ) Is between 1.89~1.91, the Abbe number (υ d ) Within 30-32, it does not contain harmful components such as thorium, lead, arsenic, etc., the glass has low coloration, good stability, and is suitable for mass production of high-refractive-index optical glass. Background technique [0002] With the large-scale use of digital cameras and camera phones, the demand for small lenses has increased sharply, and the demand for high refractive index glass suitable for the production of small lenses has also increased, especially high refractive index glass suitable for compression molding. For such high-refractive-index glass, the Chinese Patent Application Publication No. CN1569706A published a kind of SiO 2 -B 2 O 3 -BaO-La 2 O 3 -TiO 2 -Nb 2 O 5 Series of optical glass, which is due to SiO 2 , BaO has a larger sum measurement, and the transition temp...

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Application Information

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IPC IPC(8): C03C3/068C03C3/155
CPCC03C3/068C03C3/155
Inventor 陈艳丽李克炎张卫沈义梅邓和平
Owner HUBEI NEW HUAGUANG NEW INFORMATION MATERIALS CO LTD
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