Optical glass and optical element

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...

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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

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