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1. 发明授权

US4351906A Ophthalmic glasses with high indices of refraction 失效
$Ophthalmic glasses with high indices of refraction$
标题翻译：具有高折射率的眼镜
公开(公告)号：US4351906A
公开(公告)日：1982-09-28
申请号：US327771
申请日：1981-12-07
申请人： Jean E. Boudot , Jean P. Mazeau , Andre C. Michaud
发明人： Jean E. Boudot , Jean P. Mazeau , Andre C. Michaud
IPC分类号： C03C3/07 , C03C3/074 , C03C3/102 , G02C7/00 , C03C3/10
CPC分类号： C03C3/07 , Y10S501/903
摘要： The present invention is drawn to glasses suitable for the fabrication of segments or buttons for multifocal ophthalmic lenses. The inventive glasses have refractive indices ranging between about 1.745-1.771, an Abbe number greater than 29 for a refractive index of 1.771 and greater than 31 for a refractive index of 1.745, a softening point between about 640.degree.-700.degree. C., a coefficient of thermal expansion (25.degree.-300.degree. C.) between about 90-98.times.10.sup.-7 /.degree.C., and satisfactory chemical durability. The glasses consist essentially, expressed in terms of weight percent on the oxide basis, of______________________________________ SiO.sub.2 28-32.5 Na.sub.2 O 2-9 K.sub.2 O 0-4 Li.sub.2 O 0-1 K.sub.2 O + Na.sub.2 O + Li.sub.2 O 4-10.5 BaO 0-22 La.sub.2 O.sub.3 0-20 BaO + La.sub.2 O.sub.3 14-22 PbO 28.5-34 ZnO 0-4 TiO.sub.2 0-9 ZrO.sub.2 2-6.5 Nb.sub.2 O.sub.5 0-10 TiO.sub.2 + Nb.sub.2 O.sub.5 4.5-12 ZrO.sub.2 + TiO.sub.2 + Nb.sub.2 O.sub.5 6-17 ______________________________________
摘要翻译：本发明涉及适用于制造多焦点眼镜片的片段或按钮的眼镜。本发明的玻璃的折射率范围为约1.745-1.771，阿贝数大于29，折射率为1.771，折射率为1.745，折射率大于31，软化点为约640-73℃，在约90-98×10 -7 /℃之间的热膨胀系数（25-300℃）和令人满意的化学耐久性。玻璃基本上以氧化物的重量百分数表示，-SiO2 28-32.5 -Na2O 2-9-K2O 0-4 -Li2O 0-1-K2O + Na2O + Li2O 4-10.5 -BaO 0- 22 -La 2 O 3 0-20 -BaO + La 2 O 3 14-22 -PbO 28.5-34-ZnO 0-4 -TiO 2 0-9-Zr 2 2-6.5 -Nb 2 O 5 0-10 -TiO 2 + Nb 2 O 5 4.5-12 -ZrO 2 + TiO 2 + Nb2O5 6-17 -

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