Lead and arsenic free optical glass with high refractive index

A glass, ratio technology, applied in the field of optical components and preforms of such optical components, can solve the problems of difficult to accurately adjust glass composition, long viscosity curve, increased glass transition temperature, etc.

Inactive Publication Date: 2007-05-02
SCHOTT AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Specifically, most of said glasses contain a relatively high proportion of SiO 2 , SiO 2 is a network forming agent, and thus increases the transition temperature of the glass, produces a longer viscosity curve and reduces the refractive index; and / or contains, for example, F and P 2 o 5 Components that can easily evaporate during the melting and burning process, making it difficult to accurately adjust the glass composition

Method used

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  • Lead and arsenic free optical glass with high refractive index
  • Lead and arsenic free optical glass with high refractive index

Examples

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example

[0061] The following examples illustrate preferred glasses according to the invention and should not limit the scope of protection of the invention.

example 1

[0063] Weigh out the raw material of the oxide, add one or more clarifiers (such as Sb 2 o 3 ), and then mix it well. The glass mixture was melted at about 970° C. into a continuous molten aggregate with introduction of oxygen bubbles, followed by fining (970° C.) and homogenization. At a casting temperature of about 970°C, the glass can be cast and processed into desired dimensions. Experience has shown that in large volume continuous aggregates the temperature can be reduced by at least about 100K and the material can be processed to near net geometry by pressing methods.

[0064] Table 1: Calculated melting examples for 100 kg of glass (according to example glass 6)

[0065] Oxide

[0066] The properties of the glass thus obtained are given in Table 2 in Example 6.

[0067] instance number

[0068] instance number

[0069] The glasses according to the invention have a glass transition temperature Tg of less than or equal to 470° C., can be ...

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Abstract

The invention relates to a lead- and arsenic-free, preferably gadolinium-free and more preferably fluorin-free optical glass, having a refractive index (nd) of 1.19-2.05, an Abbe number (vd) of 19-25, a low transition temperature of less than or equal to 470 DEG C, and preferably less than or equal to 450 DEG C, excellent productivity, excellent workability and excellent crystal stability, contains (by weight, on an oxide basis) more than 55% bismuth oxide (Bi2O3) and more than 13% germanium dioxide (GeO2) and has Bi2O3 to GeO2 ratio 5 or less. The inventive optical glass can be used for mapping, projection, telecom, optical communication engineering, shifting drivers, and laser technology and / or microlens array.

Description

technical field [0001] The invention relates to a lead- and arsenic-free and preferably fluorine-free optical bismuth oxide glass containing germanium oxide and to the use of such glasses in the fields of surveying and mapping, projection, telecommunications, optical communication engineering, mobile drives and laser technology , and to optical elements and preforms for such optical elements. The glasses according to the invention can also be used, for example, in the field of microlens arrays of CCDs (Charge Coupled Devices, eg semiconductor elements for image conversion). Background technique [0002] In recent years, the trend in the market for optical components and in the field of optoelectronic technology (application fields of surveying, projection, telecommunications, optical communication engineering, mobile drives, laser technology and microlens arrays) has been increasingly towards miniaturization. This can be seen in the fact that finished products are becoming ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C3/066
CPCC03C3/066C03C3/068
Inventor 西蒙娜·莫尼卡·利特尔乌特·韦尔费尔比安卡·施雷德斯特凡涅·汉森
Owner SCHOTT AG
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