Optical glass with high refractive index

A technology of optical glass and high refractive index, which is applied in the field of optical glass, can solve the problems of glass devitrification resistance and chemical stability reduction, cannot meet high refractive index, etc., and achieve good devitrification resistance and chemical stability.

Active Publication Date: 2009-01-07
CDGM OPTICAL GLASS
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Problems solved by technology

[0003] The refractive index of the disclosed optical glass of CN1389414A and CN101128400A is 1.75-1.85, can not satisfy the requirement about high refractive index aspect; In addition because contain a large amount of ZnO and Li in its necessary component 2 O, when the content of these two components is too large, the devitrification resistance and chemical stability of the glass will be sharply reduced

Method used

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Embodiment Construction

[0021] The inventor conducted research and experiments, and found that: by using a specific amount of SiO 2 , B 2 O 3 , La 2 O 3 , Gd 2 O 3 , ZrO 2 , Nb 2 O 5 , Ta 2 O 5 And WO 3 The composition can obtain optical glass with the above-mentioned optical constants, good devitrification resistance and high chemical stability.

[0022] In the first aspect of the present invention, there is provided an optical glass having a refractive index in the range of 1.86 to 1.92 and an optical constant of Abbe number in the range of 35 to 40, including SiO 2 , Gd 2 O 3 , La 2 O 3 And B 2 O 3 As an essential component and selected from ZrO 2 , Nb 2 O 5 , Ta 2 O 5 And WO 3 One or more of the components in the composition have good devitrification resistance and have grade 3 acid resistance (powder method) and grade A moisture resistance (powder method).

[0023] In a second aspect of the present invention, there is provided an optical glass having a refractive index in the range of 1.86 to 1.92 a...

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PUM

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Abstract

The invention provides a high refractivity optical glass with the refractivity of 1.86 to 1.92, the abbe number of 35 to 40 and good anti-devitrification performance and chemical stability. The components of the high refractivity optical glass comprises SiO2, B2O3, La2O3 and Gd2O3 as essential components and one or a plurality of components selected from ZrO2, Nb2O5, Ta2O5 and WO3. The high refractivity optical glass has the advantages that the optical glass has optical constants with the refractivity within the scope of 1.86 to 1.92 and the abbe number within the scope of 35 to 40, contains no lead, arsenic and cadmium components, and has good anti-devitrification performance and chemical stability.

Description

Technical field [0001] The invention relates to an optical glass, in particular to a high refractive index optical glass with a refractive index (nd) of 1.86 to 1.92 and an Abbe number (vd) of 35-40. Background technique [0002] In recent years, with the rapid popularization of digital cameras and camcorders, the continuous increase of camera pixels and the development of small and lightweight cameras, optical components are required to have higher refractive index, anti-devitrification performance and chemical stability. [0003] The refractive index of the optical glass disclosed in CN1389414A and CN101128400A is 1.75-1.85, which cannot meet the requirements for high refractive index; in addition, because its essential components contain a large amount of ZnO and Li 2 O, when the content of these two components is too large, the devitrification resistance and chemical stability of the glass will be sharply reduced. Summary of the invention [0004] The technical problem to be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C3/068
Inventor 孙伟李小春李维民
Owner CDGM OPTICAL GLASS
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