Preferably pb-free and as-free optical glasses with tg less than or equal to 500 degree centigrade

A technology of optical glass and transition temperature, applied in optics, optical components, instruments, etc., can solve the problems of expensive glass and lower crystallization stability

Inactive Publication Date: 2004-08-25
SCHOTT AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Up to 12.4 wt% Li 2 The necessary content of O and 29.2 wt% SrO greatly reduces the crystallization stability
Moreover, lithium oxide used in high-performance optical glass must be made of high-purity Li 2 used in the form of O, which makes the glass more expensive

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0059] The glass of the present invention is prepared as follows:

[0060] Weigh out the oxide raw materials, preferably carbonates, nitrates and fluorides, add one or more fining agents such as Sb 2 O 3 , and then mix thoroughly. At about 1300°C, the glass batch is melted in a continuous melting apparatus, then refined (1350°C) and homogenized. The glass is cast and machined to desired dimensions at a casting temperature of approximately 1220°C, or precision thermoformed at lower temperatures (<800°C).

[0061] Example of melting of 100kg glass (calculation)

[0062] oxide

weight%

raw material

Weighing mass

(kg)

SiO 2

B 2 O 3

Al 2 O 3

Na 2 O

F

56

12

17

12

3

SiO 2

H 3 BO 3

AlO(OH)

Na 2 CO 3

NaF

56.05

21.24

21.83

12.39

6.49

total

100

118.00

...

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Abstract

Optical glass having a refractive index nd of 1.8-1.56, an Abbe number vd of 64-72 and a glass transition temperature Tg of not more than 500degrees C comprises (in wt.%) 53-58 SiO2, 11-15 B2O3, 16-20 Al2O3, 0-13 Na2O, 0-13 K2O, 9-13 SIGMA M2O, and 0.5-4 F.

Description

technical field [0001] The invention relates to a kind of refractive index of 1.48≤n d ≤1.56, Abbe number is 64≤υ d Preferably lead-free and arsenic-free optical glass of ≤72, the glass has low transition temperature (Tg≤500℃), good ion exchange performance, and also has good chemical resistance and crystallization stability, and relates to this kind of glass. use. Background technique [0002] In recent years, miniaturization has become a considerable market trend in optical and optoelectronic technologies (application fields include imaging, projection, telecommunications, optical communication technology and laser technology). This trend is evident in the ever-decreasing dimensions of finished products, which of course require increased miniaturization of the individual modules and components of such final objects. For manufacturers of optical glass, this trend, despite an increase in the number of finished products, is bound to be accompanied by a significant drop in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B1/00C03C3/118
CPCY10S501/903Y10S501/902C03C3/118
Inventor S·沃尔夫U·维尔菲尔
Owner SCHOTT AG
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