FLUORINE-FREE OPTICAL GLASS

摘要

The present invention relates to lead and fluorine and preferably lithium free optical glasses for the application areas imaging, projection, telecommunications optical communications engineering, mobile drive and/or laser technology with a refractive index of from 1.60<=N_d<=1.64 and an Abbe number of from 56<=□d<=64, which glasses have a low transformation temperature, namely less than or equal to 590° C., preferably less than or equal to 585° C., more preferred less than or equal to 570° C., which glasses can still further be produced and handled easily and are stable to crystallization. The glasses according to the invention with the following composition (in weight-% based on the oxides) comprise the following components: P₂O₅ 26-35 B₂O₃ 10-15 Al₂O₃ 5.5-10 BaO 25-37 SrO 0-6 CaO 8-15 ZnO 3-10 Bi₂O₃ 0-8 Na₂O 0-2 K₂O 0-2 WO₃ 0-10 La₂O₃ 0-2 Nb₂O₅ 0-1 TiO₂ 0-<1 earth alkali oxides >=40 alkali oxides 0-2 common refining agents 0-0.5