Optics horniness crown glass without lead and arsenical

An optical glass, the technology of m2omgocaobaosrozno210.11---57291.54.5, is applied in the field of optical hard crown glass, which can solve the problems of reduction effect and increase of furnace damage, and achieve the effect of excellent manufacturability

Inactive Publication Date: 2006-08-16
SCHOTT AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Next, Li 2 O and B 2 o 3 (5-30% by weight) leads to increased damage to the furnace, which in the case of platinum aggregates has a strong and undesired transformation-reducing effect
[0017] Disclosed in US 5,744,409 and also contains between 7 and 12 wt% Li 2 Glasses with O content exhibit considerable disadvantages

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0047] Glass according to the present invention can be produced according to the following method:

[0048] Weigh out raw materials for oxides, preferably carbonates, nitrates and / or fluorides, add one or more refining agents, e.g. Sb 2 o 3 , and mix it well. The glass mixture was melted at about 1250°C into discrete molten aggregates, then refined (1270°C) and homogenized. The glass can be poured at a pouring temperature of about 1000°C and processed to the required dimensions. In high volume continuous aggregates, the temperature can be reduced by about 100°C as a rule of thumb, and the material can be processed by direct compression near the final geometry at about 700°C.

[0049] Oxide

weight%

raw material

Weight (kg)

SiO 2

B 2 o 3

Al 2 o 3

42.0

15.0

4.0

SiO 2

B 2 o 3

AlO(OH)

42.059

15.228

5.155

Li 2 o

Na 2 o

6.0

4.0

Li 2 CO 3

Na 2 CO...

example 2

[0054] Table 2 below describes 10 glass compositions and their properties (melting examples). The composition can be manufactured via the method according to Example 1.

[0055] As a note on the fabrication, the following will be mentioned: In high volume continuous aggregates the temperature can be empirically reduced by about 100°C and the material can be processed close to the final geometry by direct pressing at about 650°C.

[0056] example

[0057] example

[0058] The table shows that the glasses according to the invention exhibit excellent properties with regard to optical range, viscosity-temperature distribution and processing temperature. Highly specific thermoforming close to final geometries can thus also be guaranteed by sensitive and precise machines. In addition, further heat treatment of the glass (pressing or re-pressing) is also easily possible because of the recognition of the relationship between the stability against crystallization a...

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PUM

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Abstract

The present invention relates to lead and arsenic-free optical hard crown glass with lower transition temperature (Tg≤520°C), characterized in that its optical range has a refractive index of 1.57≤nd≤1.61 and a refractive index of 56≤νd≤63 Dispersion coefficient. The glass has the following composition (in weight percentage): (see the above formula) wherein, ΣTiO2, ZrO2<0.9. Refining agents can be added as long as they do not contain arsenic.

Description

technical field [0001] The invention relates to a lead-free and arsenic-free optically hard crown glass with a low transition temperature (Tg≤520°C), which is characterized in that its optical range has 1.57≤n d ≤1.61 refractive index and 56≤v d ≤63 dispersion coefficient. Background technique [0002] In recent years, the market in the field of optical technology and optoelectronic technology (application fields: graphics, projection, telecommunications, optical communication engineering, optical data processing and laser technology) is increasingly trending towards miniaturization. This can be observed by the finished product, and thus the individual structural elements and assemblies also tend towards miniaturization. For producers of optical glass, this means above all a significant reduction in the required volume, despite the increased product volume. [0003] Additionally, there is increased price pressure on reprocessing machines due to the significant accumulatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C3/066C03C3/093
CPCC03C3/066C03C3/093C03C3/076C03C3/087
Inventor 西尔克·沃尔费斯特凡尼娅·汉森乌特·韦尔费尔
Owner SCHOTT AG
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