Barium flint ophthalmic glasses
    2.
    发明授权
    Barium flint ophthalmic glasses 失效
    钡火石眼镜

    公开(公告)号:US3902910A

    公开(公告)日:1975-09-02

    申请号:US44349574

    申请日:1974-02-19

    CPC classification number: C03C3/07 C03C3/072 C03C3/074

    Abstract: This invention relates to improved barium flint glasses particularly designed for production of segments or buttons for multifocal ophthalmic lenses. The glasses have refractive indices in the range of 1.64 to 1.71, corresponding dispersive indices (nu values) such that the nu value (V) is greater than 260 minus 133 times the refractive index, relatively low liquidus temperatures, and good chemical durability. The glasses consist essentially, in percent by weight, of 33-43% SiO2, 0-4% B2O3, 3343% SiO2 + B2O3, 4-9% Na2O, 0-4% K2O, 5-10% Na2O + K2O, 17-24% BaO, 0-3% CaO, 0-5% La2O3, 22-26% BaO + CaO + La2O3, 13-28% PbO, 2-5% ZnO, 15-30% PbO + ZnO, 2-4% TiO2, 3-6% ZrO2, and 6-9% TiO2 + ZrO2.

    Abstract translation: 本发明涉及特别设计用于生产多焦点眼科镜片的片段或按钮的改进的钡火石眼镜。 玻璃的折射率在1.64〜1.71的范围内,相应的色散指数(nu值)使得nu值(V)大于260减去133倍的折射率,相对低的液相线温度和良好的化学耐久性。 玻璃基本上以重量百分比计,33-43%SiO 2,0-4%B 2 O 3,33-43%SiO 2 + B 2 O 3,4-9%Na 2 O,0-4%K 2 O,5-10%Na 2 O + K 2 O ,17-24%BaO,0-3%CaO,0-5%La2O3,22-26%BaO + CaO + La2O3,13-28%PbO,2-5%ZnO,15-30%PbO + ZnO,2 -4%TiO 2,3-6%ZrO 2和6-9%TiO 2 + ZrO 2。

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