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US3999996A Compatible near-portion phototropic glass 失效
兼容近部分光热玻璃

Compatible near-portion phototropic glass
摘要：
Glass as near-portion material for fusion with known phototropic far-portion glasses for multifocal spectacle lenses has a linear thermal expansion coefficient between 45 and 58 .times. 10.sup.-.sup.7 /.degree. C, a refractive index of n.sub.d .gtoreq.1.60, a speed of crystallization of less than 0.5 .mu./min., and the following composition:______________________________________ SiO.sub.2 10.0 - 20.0 % by weight B.sub.2 O.sub.3 15.0 - 23.0 % by weight PbO >26.0 - 30.0 % by weight ZnO 3.0 - 5.0 % by weight La.sub.2 O.sub.3 6.0 - 10.0 % by weight Al.sub.2 O.sub.3 12.0 - 17.0 % by weight ZrO.sub.2 0.5 - 3.0 % by weight TiO.sub.2 0.2 - 3.0 % by weight K.sub.2 O 0.1 - 2.0 % by weight Na.sub.2 O 0.1 - 2.0 % by weight Li.sub.2 O 0.1 - 4.0 % by weight ______________________________________ With the provision that:______________________________________ sum of SiO.sub.2 + B.sub.2 O.sub.3 is 30.0 - 40.0 % by weight sum of the alkali oxides is 0.2 - 3.0 % by weight sum of Al.sub.2 O.sub.3 + La.sub.2 O.sub.3 is 19.0 - 27.0 % by weight sum of the alkaline earth oxides is 3.0 - 8.0 % by weight, MgO being less than 5 % by weight and BaO being 3 - 8 % by weight sum of ZnO + ZrO.sub.2 + TiO.sub.2 is 3.0 - 6.0 % by weight sum of the oxides of Bi, Ta, Nb, W is 0 - 5.0 % by weight. ______________________________________
摘要（中）：

玻璃作为用于与多焦点眼镜片的已知光致变色远端眼镜融合的近部分材料具有45至58×10 -7 /℃之间的线性热膨胀系数，nd> / = 1.60的折射率，a 结晶速度小于0.5微米/分钟，组成如下：} SiO 2 10.0〜20.0重量％} B 2 O 3 15.0〜23.0重量％} PbO> 26.0〜30.0重量％} ZnO 3.0〜5.0重量％ } La 2 O 3 6.0〜10.0重量％} Al 2 O 3 12.0〜17.0重量％} ZrO 2 0.5〜3.0重量％·TiO 2 0.2〜3.0重量％·K 2 O 0.1〜2.0重量％·Na 2 O 0.1〜2.0重量％·Li 2 O 0.1〜4.0重量％}，其中：SiO 2 + B 2 O 3的重量比为30.0〜40.0重量％}碱金属氧化物的总量为0.2〜3.0重量％} Al 2 O 3 + La 2 O 3的和为19.0〜27.0质量％ 碱土金属氧化物的重量和总量为3.0〜8.0重量％，MgO}小于} 5重量％}，BaO}为3〜8重量％} ZnO + ZrO 2 + TiO 2的总和为3.0〜 6.0％（重量）} Bi，Ta，Nb，W的氧化物为0-5.0重量％。 }

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