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专利名称：Optical glass, press-molding preform and
optical part
发明人：Kazutaka Hayashi,Yasuhiro Fujiwara,Zou
Xuelu
申请号：US11902409申请日：20070921
公开号：US20080026928A1公开日：20080131
摘要：A high-refractivity low-dispersion optical glass that gives press-moldingpreforms excellent in high-temperature shapability and suitable for precision press-molding, including an optical glass comprising BO, LaO, GdOand ZnO as essentialcomponents, substantially containing none of lead and fluorine, having a refractive index(nd) of 1.72 to 1.83, an Abbe's number (νd) of 45 to 55 and a glass transition temperature(Tg) of 630° C. or lower and having a viscosity of at least 0.6 Pa·s at its liquidus
temperature, and an optical glass comprising, by mol %, 45 to 65% of BO, 5 to 22% ofLaO, 1 to 20% of GdO, provided that the total content of LaOand GdOis 14 to 30%, 5 to30% of ZnO, 0 to 10% of SiO, 0 to 6.5% of ZrOand 0 to 1% of SbO, substantially
containing none of lead and fluorine, and having a refractive index (nd) of 1.72 to 1.83 andan Abbe's number (νd) of 45 to 55.
申请人：Kazutaka Hayashi,Yasuhiro Fujiwara,Zou Xuelu
地址：Tokyo JP,Tokyo JP,Tokyo JP
国籍：JP,JP,JP
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