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Environment-friendly lanthanum flint optical glass with high refractive index

An optical glass and high refractive index technology, which is applied in the field of high refractive index environmental protection lanthanum flint optical glass, can solve the problems of refractory, easy precipitation, accumulation and blockage of the material tube, and achieves the effect of avoiding the tendency of crystallization and having little effect on coloring.

Active Publication Date: 2013-01-02
HUBEI NEW HUAGUANG NEW INFORMATION MATERIALS CO LTD
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  • Application Information

AI Technical Summary

Problems solved by technology

[0006] CN 201010131367 patent contains SnO 2 , SnO 2 Although it has the effect of improving the coloring degree of glass, it is refractory and easy to precipitate and accumulate to block the material pipe

Method used

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  • Environment-friendly lanthanum flint optical glass with high refractive index

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Embodiment Construction

[0031] Five embodiments of the present invention and three comparative examples are shown in Table 1.

[0032]

[0033] As can be seen from the examples and comparative examples in Table 1, adding TiO 2 and WO 3 The coloring degree of the back glass is obviously reduced, which is manifested in the deepening of the color of the glass, and the addition of TiO 2 and WO 3 The dispersion of the rear glass is significantly increased, which is not good for reducing the dispersion of the glass. Add Li 2After O, the coloring degree of the glass is improved, and the dispersion is also reduced, but the refractive index of the glass is seriously reduced, which is not good for increasing the refractive index of the glass, and Li 2 O is very corrosive to the quartz crucible, which will shorten the service life of the quartz crucible.

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Abstract

The title of the invention is environment-friendly lanthanum flint optical glass with high refractive index. The invention belongs to the technical field of optical glass with a high refractive index. The invention mainly provides environment-friendly lanthanum flint optical glass with a high refractive index and low chromatic dispersion. The invention is mainly characterized in that the components comprise the following compounds by weight: 2-5% of SiO2; 25-32% of B2O3; 1-3% of ZnO; 30-40% of La2O3; 3-6% of ZrO2; 0.1-3% of Nb2O5; 16-23% of Gd2O3; and 1-3% of Ta2O5. The invention has the characteristics that the optical glass does not contain alkali metal components such as Li2O and the like, does not contain WO3 or TiO2 which are easy to cause glass colorization, does not contain fluorides which are easy to volatilize and are harmful to human body and the environment, does not contain SnO2 which is easy to deposit or enrich, has a refractive index nd of 1.74-1.80, an Abbe number ud of 45-55, and a colorization degree (lambda80 / lambda5) of less than 380 / 310, and is mainly used for environment-friendly lanthanum flint optical glass with a high refractive index.

Description

technical field [0001] The invention belongs to the technical field of high refractive index optical glass. Specifically relates to a high-refractive-index environment-friendly lanthanum flint optical glass, which has a refractive index nd of 1.74-1.80 and an Abbe number υd of 45-55. Background technique [0002] Traditional optical glass generally contains elements such as lead, arsenic, and cadmium. With the development of society, people's awareness of environmental protection is gradually increasing, and the traditional optical glass containing harmful substances is gradually being replaced by environmentally friendly optical glass. With the development of precision and miniaturization of optical systems, especially household digital cameras, the direction of lightness and thinness is developing, which requires the use of high refractive index and low dispersion glass to manufacture lenses. The glass of the present invention belongs to high refractive index and low disp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C3/068C03C4/02
Inventor 张小东黄国雅胡向平
Owner HUBEI NEW HUAGUANG NEW INFORMATION MATERIALS CO LTD