Optical glass

Abstract

The invention provides optical glass which has reduced or no tantalum, low cost and good bubbles and stripes and is easy to be stably produced. The optical glass comprises 10-30% by weight of SiO2, 20-45% by weight of B2O3, 10-35% by weight of La2O3, 12-30% by weight of BaO, 0-10% by weight of ZrO2, and 0-10% by weight of ZnO. Through reasonable refractive index design, the refractive index of theoptical glass is 1.62-1.70, and the Abbe number is 55-62. The optical glass has low cost, good chemical stability, excellent anti-crystallization property and good transmittance. At the same time, the bubbles and stripes of the glass are good, and the optical glass is easy to be stably produced, and can be widely applied to digital cameras, digital video cameras, camera cell phones and the like.

Description

technical field [0001] The invention relates to an optical glass with a refractive index of 1.62-1.70 and an Abbe number of 55-62, as well as a glass preform and an optical element made of the optical glass. Background technique [0002] In recent years, with the development of optoelectronic systems, optical glasses with a refractive index of 1.62-1.70 and an Abbe number of 55-62 have been widely used. With the rapid development of camera-capable smartphones, the digital camera market shipments continue to shrink, and the market competition for optical glass is becoming increasingly fierce. At the same time, the price of optical glass raw materials has increased significantly, which further increases the manufacturing cost of glass. Only products with low cost of raw materials and excellent comprehensive performance can have stronger competitiveness. [0003] CN1323281A discloses an optical glass with a refractive index of 1.65-1.73 and an Abbe number of 50-60. The glass ...

AI Technical Summary

Problems solved by technology

[0003] CN1323281A discloses an optical glass with a refractive index of 1.65-1.73 and an Abbe number of 50-60. The glass component contains a certain amount of Ta 2 o 5 , due to Ta 2 o 5 Expensive, will greatly increase the production cost of glass and reduce its competitiveness

B in glass disclosed in Chinese patent application 200780006271.6 2 o 3 The content is 46-70%, B 2 o 3 The content of B is high, although the chemical material is easy, but the viscosity of the glass is too small, which is not good for molding, and B 2 o 3 Severe volatilization is unfavorable for the stable control of the refractive index and dispersion in the production process. Streaks are prone to occur in mass production and affect the intrinsic quality of the glass

At the same time, excessive B 2 o 3 It is not conducive to improving the chemical stability of glass

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