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Lead-free and arsenic-free niobium phosphate optical glass

一种玻璃、碱金属氧化物的技术，应用在玻璃的成型、玻璃的压制、玻璃制造设备等方向，能够解决玻璃变色等问题

Inactive Publication Date: 2007-02-21
SCHOTT AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is explained that amounts of said components above 22% by weight can lead to undesired discoloration of the glass upon exposure to UV light

Method used

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  • Lead-free and arsenic-free niobium phosphate optical glass
  • Lead-free and arsenic-free niobium phosphate optical glass

Examples

Experimental program
Comparison scheme
Effect test

example

[0073] The following examples illustrate preferred glasses according to the invention and should not limit their scope of protection.

example 1

[0075] Weigh the raw material of the oxide, add one or more such as Sb 2 o 3 clarifier and then mix it thoroughly. The glass mixture was melted into a continuous molten aggregate at about 1100°C and sparged with oxygen, followed by fining (1100°C) and homogenization. At a casting temperature of about 1160°C, the glass can be cast and processed to the desired dimensions. Experience has shown that in high volume continuous aggregates the temperature can be lowered by at least about 100K and the material can be processed into a final geometry by a pressing process.

[0076] Oxide

example 2

[0078] Table 2: Composition of examples of glasses according to the invention, i.e. showing glasses 1 to 14:

[0079] instance number

[0080] instance number

[0081] The glasses according to the invention have a glass transition temperature Tg of less than or equal to 595° C., are well processable and have very good resistance to alkalis (good alkali resistance). Expansion coefficient below 9×10 -6 / K, which is measured over a temperature range of 20 to 300°C.

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PUM

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Abstract

The present invention describes the lead-free, arsenic-free, preferably gadolinium-free and fluorine-free, optical glass which is used in the field of application of plotting, projection, telecommunications, optical communication engineering, mobile hard disk and / or laser technology, and which has a refractive index of 1.86<=Nd<=1.95, an Abbe number of 19<=Vd<=24, a transformation temperature of <=595 DEG C., preferably <=550 DEG C., good crystallization stability, good processing properties and production properties. The optical glass has a composition described in claim 1.

Description

technical field [0001] The present invention relates respectively to lead- and arsenic-free and preferably fluorine-free optical niobium phosphate glasses, the use of said glasses in the fields of surveying and mapping, projection, telecommunications, optical communication engineering, mobile hard disks and laser technology, as well as optical elements and so-called The optical element "preform". Background technique [0002] In recent years, the market trend in the fields of optics and optoelectronics technology (the application fields of surveying and mapping, projection, telecommunications, optical communication engineering, mobile hard disk and laser technology) is more and more concentrated on the direction of miniaturization. This trend can be found in finished products that are becoming smaller and of course requires an increasing miniaturization of the individual structural parts and assemblies of said finished products. For producers of optical glass, this developm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C3/21C03B11/00
CPCC03C3/253
Inventor 西蒙娜·莫尼卡·里特乌特·韦尔费尔斯特凡尼娅·汉森
Owner SCHOTT AG
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