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Optical glass and optical element

An optical glass and light transmittance technology, applied in the fields of glass preforms, optical components and optical instruments, can solve the problems of transition metal ion impurities entering glass, high viscosity of glass at high temperature, and high viscosity of Pyrex glass.

Active Publication Date: 2020-12-04
CDGM OPTICAL GLASS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The viscosity of Pyrex glass is very high at high temperature. Even at the melting temperature of 1600°C, the degree of bubbles and streaks of the glass cannot meet the requirements of optical imaging.
At the same time, due to the very high melting temperature required during production, the glass solution will severely corrode the refractory material, which will cause the transition metal ion impurities in the refractory material to enter the glass, so that the light transmittance of the glass cannot meet the requirements of optical imaging. , when severe, the glass even becomes green
[0004] In recent years, with the intensification of competition in the automotive industry, the cost requirements for auto parts have become higher and higher. Automotive lens manufacturers have gradually begun to use the one-time drop molding method to manufacture lenses. Compared with the traditional two-time molding method, one-time Drop molding can greatly reduce manufacturing costs, but Pyrex glass cannot be produced by one-time drop molding because of its high viscosity during the molding stage

Method used

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  • Optical glass and optical element
  • Optical glass and optical element
  • Optical glass and optical element

Examples

Experimental program
Comparison scheme
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Embodiment

[0096]

[0097]In order to further clearly explain and illustrate the technical solution of the present invention, the following non-limiting examples are provided.

[0098]In this example, the optical glass having the composition shown in Table 2 to Table 3 was obtained by using the above-mentioned manufacturing method of optical glass.In addition, the characteristics of each glass were measured by the test method described in the present invention, and the measurement results are shown in Tables 2 to 3.

[0099]Table 2.

[0100]

[0101]

[0102]table 3.

[0103]

[0104]

[0105]

[0106]The glass obtained in Examples 1 to 20 of the optical glass was formed by means of a grinding process, or a press molding method such as hot press molding and precision press molding to produce concave meniscus lenses, convex meniscus lenses, and biconvex lenses, Bi-concave lenses, plano-convex lenses, plano-concave lenses, and other prefabricated lenses, prisms, etc.

[0107]

[0108]Annealing the preforms obtained in the above ex...

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PUM

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Abstract

The invention provides optical glass with a refractive index of 1.50-1.56, an Abbe number of 57-67 and low high-temperature viscosity. The optical glass comprises the following components in percentage by weight: 50-80% of SiO2, 3-20% of B2O3, 5-25% of Li2O, Na2O and K2O, and 0.05-5% of Al2O3 and ZrO2, and the ratio of (Li2O+Na2O+ K2O+ B2O3) / (SiO2+Al2O3) ranges from 0.2 to 0.8. Through reasonablecomponent design, the obtained optical glass has the advantages of expected refractive index and Abbe number, low high-temperature viscosity, excellent internal quality and light transmittance, low raw material cost, low production energy consumption, low unit nitrogen oxide emission and good process performance, and can meet the requirements of a one-time dropping molding process; and the opticalglass can be applied to the fields of high-precision imaging-level vehicle-mounted headlamp lens manufacturing and the like.

Description

Technical field[0001]The invention relates to an optical glass, in particular to an optical glass with high temperature and low viscosity, and glass preforms, optical elements and optical instruments made of the optical glass.Background technique[0002]In the prior art, automotive headlight lenses are usually made of Pylex glass, which has a lower coefficient of thermal expansion and higher chemical stability, and has greater advantages in manufacturing automotive lenses. With the development of vehicle headlight technology in the direction of intelligence, high power, precision control, laser light source, etc., correspondingly, the quality of automotive lenses needs to be improved to the imaging level, and even more precise aspheric lenses need to be manufactured.[0003]The high temperature viscosity of Pylex glass is very large, even at the melting temperature of 1600℃, the bubble degree and streak degree of the glass cannot meet the requirements of optical-grade imaging. At the sa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C3/093C03C3/097C03C3/095
CPCC03C3/093C03C3/097C03C3/095
Inventor 毛露路郝良振匡波
Owner CDGM OPTICAL GLASS
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