Low-temperature molding optical glass

Abstract

The low temperature molded optical glass consists of P2O5 9-25 wt%, GeO2 1-20 wt%, Nb2O5 12-28 wt%, TiO2 1-7 wt%, Bi2O 30-55 wt%, WO3 0-38 wt%, SiO2 0-3 wt%, B2O3 0-5 wt%, Al2O3 0-2 wt%, Ta2O5 0-3 wt%, Sb2O3 0-1 wt%, R2O not more than 13 wt%, where R is Li, Na and/or K, and XO not more than 15 wt%, where X is Ca, Sr, Ba and/or Zn. The low temperature molded optical glass contains no lead oxide, arsenic oxide and other environment harming components, and has easy production and no devitrification within the temperature range near the softening point.

Description

【Technical field】 [0001] The present invention relates to a low temperature molded optical glass, in particular to a low temperature molded optical glass with improved composition and high refractive index. 【Background technique】 [0002] As digital cameras and other optoelectronic products have higher and higher performance requirements and smaller and smaller size requirements, in order to meet such requirements, it is necessary to use aspheric surfaces and high-refractive index materials in the design of optical systems to achieve lightness and thinness. short purpose. To produce aspherical lenses, if the production is done by grinding, it is time-consuming, with low yield and high cost. Therefore, precision press molding technology has become the mainstream and indispensable production technology in recent years. [0003] Existing optical glass with low glass transition temperature discloses as Japanese Patent No. 7-247135 and No. 10-316448, and the glass composition di...

AI Technical Summary

Problems solved by technology

[0010] As can be seen from the above table, the embodiment No. 2002-173336 will lose clarity near the softening point, the liquidus temperature is high, and pulses are easy to occur during production; the embodiment No. 2001-0588...