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Optical glass

An optical glass, glass technology, applied in optics, optical components, glass molding, etc., can solve problems such as polluting the environment, reducing chemical stability, and reducing surface precision.

Inactive Publication Date: 2011-05-11
SCHOTT GLASS TECH (SUZHOU) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although phosphoric acid and boric acid can be used to lower the molding temperature, they cause, for example, deterioration of the chemical stability (or chemical durability or chemical resistance, respectively) of the glass
Glasses with poor chemical stability lead to a reduction in the surface precision of the mold and a reduction in the life of the mold
Although the introduction of fluoride in the above glass can lower the transition temperature and produce a stable and homogeneous product, the volatilization of glass compounds will increase significantly during the glass melting process, causing it to pollute the environment
The glass containing lead is also mentioned in the above prior art, but the volatile lead compound can adhere to the mold material and will cause problems such as the precision of the mold surface
Borosilicate glass as described in JP62-123040A also has reduced chemical stability

Method used

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  • Optical glass

Examples

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Embodiment

[0047] Table 1 contains examples of embodiments within preferred compositional ranges. The glasses described in the examples were prepared as indicated below:

[0048] The raw materials we use are oxides, hydroxides, carbonates, nitrates, etc.

[0049] After weighing and mixing, the mixture was placed in a platinum crucible. It is melted in an electric furnace at 1000-1300°C and stirred in time, then cast into a metal mold preheated to an appropriate temperature, and then slowly cooled and manufactured.

[0050] The compositions (wt% based on oxide weight), refractive indices, Abbe numbers and transition temperatures of Examples 1-5 are shown in Table 1.

[0051] Table 1 (composition, wt% based on oxide)

[0052]

[0053] Yb 2 o 3

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Abstract

The invention relates to precision moulding optical glass with high refractive index and low dispersion. With respect to application advantages, the optical glass can be used for producing optical parts and does not need to be polished, such as a lens for a digital camera. The optical parts produced through precision moulding can be used in the technical fields of imaging, projection, radio communication, optical communication engineering and laser.

Description

technical field [0001] The present invention relates to optical glass for precision molding (or precision molding, respectively) wherein the molding (or molding, respectively) temperature can be very low. Background technique [0002] As a medium refractive index and low dispersion (n d 1.59 or more and ν d is at least 54) optical glass, glass of known phosphate system (as described in JP55-154343A, JP58-79839A and JP60-122749A), glass of fluorophosphoric acid system (such as JP56-59641A, JP56-149343A and JP58-217451A described) and fluoroborate system (as described in JP59-146952A). [0003] In the precision molding process, the lower the transition temperature of the glass, the longer the life of the mold and therefore the higher the profit. Thus, there is a need for so-called "low T g The need for "glass", that is, a glass with a low melting point and a low transition temperature, that is, a glass with a viscosity sufficient for processing at as low a temperature as p...

Claims

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Application Information

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IPC IPC(8): C03C3/068C03C3/095G02B1/00C03B11/00
Inventor 张广军
Owner SCHOTT GLASS TECH (SUZHOU) CO LTD
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