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Leadless and specially arseniumless optical double-crown glass

A kind of optical glass and glass technology, applied in optics, optical components, instruments, etc., can solve the problems of decreased light transmission performance and unacceptable addition amount

Inactive Publication Date: 2004-05-12
SCHOTT AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But in the modern optical application fields mentioned above, such a high Sb 2 o 3 The amount of addition is not allowed, because by absorbing this component by itself, it will lead to a decrease in light transmission performance

Method used

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Examples

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Effect test

Embodiment

[0062] Tables 2 and 3 include 13 examples within the range of preferred compositions and one comparative example. The glass of the present invention is produced according to the following method:

[0063] The oxide-providing materials, preferably the corresponding carbonates, nitrates and / or fluorides, and phosphate components, preferably complex phosphates, are weighed out. Then add one or more clarifiers, such as Sb 2 o 3 . It is then mixed well. The glass mixture was melted at about 1070° C. in a continuous melting apparatus, thereby achieving clarification (1100° C.) and homogenization. Glass can be cast and processed to desired dimensions at a casting temperature of about 800°C. In large-volume, continuous equipment the temperature can be dropped empirically by about 100°C, and the material can be processed at about 650°C by direct molding with a similar final geometry.

[0064] Oxide

[0065] The properties of the glass obtained are listed in Table 2, Exa...

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Abstract

The present invention describes lead-free and preferably arsenic-free optical glasses for the application areas imaging, projection, telecommunications, optical communication technology and / or laser technology, having a refractive index of 1.55 <= Nd <= 1.60, an Abbe number of 54 <= nud <= 63 and a low transformation temperature Tg <= 500 DEG C., and having good production and processing properties and crystallization stability, combined at the same time with the absence of PbO and As2O3. The glasses according to the invention within the following composition range (in % by weight, based on oxide) satisfy these requirements: P2O5, 43-56; ZnO, 21-36; Al2O3, 0-6; Na2O, 0-16; K2O, 0-8; SigmaM2O <= 16; MgO, 0-5; CaO, 0-5; BaO, 3-14; B2O3, 0-8; La2O3, 0-7. In addition, they may also contain standard refining agents.

Description

technical field [0001] The invention relates to a lead-free and in particular arsenic-free optical double crown glass (Schwerkronglas), the use of such glasses in the fields of imaging, projection, telecommunications, optical communication technology and laser technology, as well as optical elements or such optical elements The prefab for the component. Background technique [0002] In recent years, whether it is optical or optoelectronic technology (in imaging, projection, telecommunication, optical communication technology and laser technology application fields), its market development direction is increasingly miniaturized. This trend can be seen from the increasingly smaller size of finished products, and naturally requires the continuous miniaturization of each component of this finished product. For optical glass producers, although the number of finished products can be increased, this development is closely related to whether the volume of rough glass required can ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B1/00C03C3/16C03C3/17C03C3/19
CPCC03C3/16C03C3/17
Inventor S·沃尔夫U·维费尔
Owner SCHOTT AG
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