Optical glass for precision molding

An optical glass, glass technology, applied in optics, optical components, instruments, etc., can solve the problems of high volatility of glass components, unsuitable optical glass, adhesion of mold surfaces, etc., and achieve low dispersion, low element volatilization and diffusion, and high refraction. rate effect

Inactive Publication Date: 2011-08-17
SCHOTT GLASS TECH (SUZHOU) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] JP1286934 discloses a low melting point glass, the disadvantages of these glasses are: easy to adhere to the surface of the mold, high degree of volatilization in the precision molding process
[0009] JP 60-221338 discloses a high-refractive-index optical glass used in a precision molding process, but since the devitrification temperature of the glass is higher than the temperature at which the glass is suitable for precision molding viscosity, the glass is not suitable for precision molding by using production of optical glass
In addition, the disadvantages of the glass are that it is easy to stick to the surface of the mold, and the glass components have a high volatility during the precision molding process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0102] Table 1 is an example of implementation within the preferred composition range. The glass described in the example is prepared according to the following steps:

[0103] The raw materials used are commercially available conventional oxides, hydroxides, carbonates and nitrates, all purchased from Sinopharm Chemical Reagent Co., Ltd. (Suzhou), chemical grade. According to the weight composition listed in the table, after weighing and mixing, put the mixture into a 500ml platinum crucible. Melt, clarify and homogenize in an electric furnace at 1100-1400°C and then cool down. The molten glass is cast into a metal mold preheated at 400°C, and then the glass and the metal mold are annealed and cooled in an annealing furnace to obtain.

[0104] Table 1 shows the composition, refractive index, Abbe number, and transition temperature of Examples 1-6, where the content is expressed in wt% based on the oxide.

[0105] The glass sample was made into a 20×20×5mm square, one corner of whi...

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Abstract

The invention relates to an optical glass for precision molding, of which the refractive index eta[d] is greater than 1.67 and smaller than 1.70, the Abbe number vd is greater than 52.0 and smaller than 55.0, and the glass transition temperature T[g] is lower than 550 DEG C. The optical glass for precision molding comprises the following components in percentage by weight: 5.5-15% of SiO2, 2.6-8% of LiO2, 20-40% of B2O3, 21.5-35% of La2O3, 0.5-10% of Y2O3, 0.1-8% of Ta2O5, 0.1-5% of ZrO2, 1-35% of ZnO, 0-15% of SrO, 0-22% of BaO, 0-10% of Al2O3, 0-2% of Na2O, 0-1% of Sb2O3, 0-1% of SnO2 and 0-1% of CeO2.

Description

Technical field [0001] The present invention generally relates to optical glass. In particular, the present invention relates to an optical glass suitable for precision molding. More particularly, the present invention relates to a precision molded optical glass with high refractive index, low dispersion and low glass transition temperature. At the same time, the glass has low element volatilization during the molding process and does not adhere to the mold material. Background technique [0002] In recent years, products in the optical and optoelectronic technology markets have become increasingly miniaturized. The demand for smaller and smaller end products, as well as the growing demand for the miniaturization of individual components and components of such end products, has proven this. For optical glass manufacturers, this development means that, in addition to improving the quality of finished products, it is undoubtedly required to reduce the volume of raw glass. At the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C3/00C03C3/068
CPCC03C3/068G02B5/00
Inventor 张广军乔斯·西默
Owner SCHOTT GLASS TECH (SUZHOU) CO LTD
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