Optical glass

A technology of optical glass and mass percentage, which is applied in the field of heavy lanthanum flint optical glass, which can solve the problems of poor crystallization performance, difficulty in achieving optical performance, and poor chemical stability of glass, and achieve the effect of reducing production costs

Active Publication Date: 2011-12-07
HUBEI NEW HUAGUANG NEW INFORMATION MATERIALS CO LTD
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  • Abstract
  • Description
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Problems solved by technology

[0010] The glass disclosed in the patent CN 101397189A belongs to the same category as the present invention, but it contains as an essential component Σ(ZnO+Nb 2 o 5 ), have obvious difference with protection scope of the present invention, in addition, too much ZnO can make the chemical stability of glass gradually deteriorate, and too much Nb 2 o 5 Also can make the devitrification performance of glass gradually worsen, and it is difficult to reach the expected optical performance of the present invention

Method used

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Embodiment

[0041] Examples 1 to 5 listed in the following table 1 are used to illustrate that the present invention obtains a heavy lanthanum flint optical glass with a refractive index (nd) between 1.80 and 1.81 and an Abbe number (υd) between 45 and 48 specific implementations. Comparative Examples A and B are comparative embodiments with a refractive index between 1.80-1.81 and an Abbe number between 45-48.

[0042] Calculate, weigh and mix these raw materials according to the ratio provided in Table 1, and put the prepared batch into the smelting device (in view of the application requirements of the present invention, the smelting device needs to adopt a platinum crucible), and then take After smelting with proper mixing, clarification and cooling process, it is poured or leaked into the forming mold. Finally, after post-processing such as annealing and processing, or directly pressing and forming through precision pressing technology, this environmentally friendly heavy lanthanum ...

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Abstract

The invention provides optical glass with B2O3, La2O3 and Gd2O3 as the main components, and the optical glass contains no thorium, cadmium and arsenic, and preferably contains no lead and fluorine. The refractive index (nd) of the optical glass is in a range of 1.80 to 1.81, and the Abbe number (vd) of the optical glass is in a range of 45 to 48. According to tests by the method of GB/T17129, water resistance (DW) of the optical glass is of grade 1, and acid resistance (DA) is of grade 3 or of a higher grade. On a mass percentage basis, the optical glass comprises 0 to 5% of SiO2, 23 to 32% of B2O3, 28 to 36% of La2O3, 3 to 7% of ZrO2, 0 to 6% of Nb2O5, 0 to 5% of ZnO, less than 2% of Y2O3, 20 to 28% of Gd2O3, 0 to 4% of WO3, 0 to 3% of TiO2, 0 to 2% of Sb2O3 and 0 to 5% of sigma(R2O + RO). The optical glass has good crystallization performance and is suitable for production.

Description

technical field [0001] The invention relates to an optical glass, in particular to a heavy lanthanum flint optical glass with a refractive index (nd) between 1.80-1.81 and an Abbe number (ud) between 45-48. Background technique [0002] In recent years, in order to meet the high-pixel, small and light requirements of high-end digital products, the demand for heavy lanthanum flint optical glass with the advantages of high refraction, medium dispersion, and small specific gravity is increasing. In order to make the glass have the above properties, the La in the glass 2 o 3 、TiO 2 , Nb 2 o 5 The component content is also gradually increasing, but too much of these components will lead to defects such as low glass viscosity, difficult molding, difficulty in obtaining high-quality streaks, and severe crystallization. [0003] The glass disclosed in the patent CN 1510002A belongs to the same kind of glass as the present invention, but its components contain more than 10% ZnO....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C3/068C03C3/155
Inventor 霍金龙杨爱清张卫唐雪琼
Owner HUBEI NEW HUAGUANG NEW INFORMATION MATERIALS CO LTD
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