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Lead and arsenic free optical lanthanum borate glass

A glass, B2O3 technology, applied in the field of preforms of optical components, can solve problems such as damage to the internal transmittance of glass

Active Publication Date: 2006-12-13
SCHOTT AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Contains Bi in each case 2 o 3 , Bi 2 o 3 imparts its own color to the glass, which impairs the internal transmission of the glass

Method used

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  • Lead and arsenic free optical lanthanum borate glass
  • Lead and arsenic free optical lanthanum borate glass

Examples

Experimental program
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Effect test

example 2

[0095] Tables 2 to 5 in Example 2 contain examples of implementation within preferred composition ranges. The glasses described in the examples were prepared as in Example 1:

example 1

[0097] Weigh the raw material for oxide, add one or more clarifiers (for example, Sb 2 o 3 ), followed by thorough mixing. The glass mixture was melted at about 1150°C into a continuous molten aggregate, followed by clarification (1200°C) and homogenization. At a casting temperature of about 1180°C, the glass can be cast and processed to the desired dimensions. Experience has shown that in large volume continuous aggregates, the casting temperature can be lowered by at least about 100K and the material can be processed to the final geometry by pressing methods.

[0098] Oxide

[0099] The properties of the glass thus obtained are given in Table 3 of Example 10.

[0100] Example 2:

[0101] Tables 2 to 5 contain Examples 1 to 26 according to the invention.

[0102] The glasses according to the invention all have a Tg lower than or equal to 560° C., have very good alkali resistance and can be processed well. The glass according to the invention has a color code v...

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PUM

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Abstract

The present invention describes lead and arsenic free and preferably gadolinium and further preferably also fluorine free optical glasses for the application fields mapping, projection, telecommunication, optical communication engineering, mobile drive and / or laser technology with a refractive index of 1.75<=Nd<=1.85, an Abbe number of 34<=Vd<=44 and have a low transformation temperature, namely lower than or equal to 560 DEG C. and preferably lower than or equal to 550 DEG C., as well as good producability and processability and crystallisation stability. The glasses according to the present invention within the following composition range (based on oxide in % by weight) contain the following component B2O3, ZnO, La2O3, Ta2O5.

Description

technical field [0001] The present invention relates to a lead-free, arsenic-free, preferably gadolinium-free and fluorine-free optical lanthanum borate glass, and the use of this glass in the fields of mapping, projection, communication, optical communication engineering, mobile hard disk and laser technology, and Optical elements, and correspondingly preforms for these optical elements. Background technique [0002] In recent years, the market trend in the field of optical technology and optoelectronic technology (mapping, projection, communication, optical communication engineering, mobile hard disk and application of laser technology) is increasingly moving towards miniaturization. This trend manifests itself in ever smaller finished products which naturally require the ever-increasing miniaturization of the individual structural members and assemblies of these finished products. For producers of optical glass, this development means that the volume of blank glass requi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C3/068
CPCC03C3/068
Inventor 莫妮卡·西蒙娜·里特乌特·威尔费尔斯特凡尼娅·汉森
Owner SCHOTT AG
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