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发明授权
US4088501A Photochromic alumino-phosphate glasses 失效
光致变色磷酸铝眼镜

Photochromic alumino-phosphate glasses
摘要：
Fast-response photochromic boron-free aluminophosphate glasses which have silver halide crystals dispersed throughout the glass comprise, in weight percentages:______________________________________ SiO.sub.2 10 to 17% Al.sub.2 O.sub.3 20 to 29% P.sub.2 O.sub.5 30 to 40% R.sub.2 O 8.5 to 17% R'O 4 to 18% ______________________________________ Where R.sub.2 O represents Na.sub.2 O and/or K.sub.2 O; R'O represents CaO and/or BaO, the CaO content being at least 4% if BaO is absent and being from 0 to 7% if BaO is present, while the BaO content is from 0 to 18%; the total of SiO.sub.2 + Al.sub.2 O.sub.3 + P.sub.2 O.sub.5 amounting to not less than 69% by weight of the glass. Preferably the total of SiO.sub.2 + P.sub.2 O.sub.5 + Al.sub.2 O.sub.3 is not less than 72% by weight of the glass. The silver content of the glass, expressed as Ag.sub.2 O, is preferably not less than 0.05%. Refractive index n.sub.D can be corrected to the standard ophthalmic value of 1.523 by additions of TiO.sub.2, ZrO.sub.2 and/or PbO.
摘要（中）：

具有分散在整个玻璃中的卤化银晶体的快速响应的光致变色无硼磷酸铝玻璃包含重量百分比：} SiO 2 10至17％} Al 2 O 3 20至29％} P 2 O 5 30至40％} R 2 O 8.5至17％} R 'O 4〜18％} R 2 O表示Na 2 O和/或K 2 O; 如果BaO不存在，则R'O表示CaO和/或BaO，如果BaO不存在，CaO含量为至少4％，如果BaO存在，则CaO含量为0至7％，而BaO含量为0至18％; SiO 2 + Al 2 O 3 + P 2 O 5的总量不小于玻璃的69重量％。 优选地，SiO 2 + P 2 O 5 + Al 2 O 3的总和不小于玻璃的72重量％。 以Ag2O表示的玻璃的银含量优选为0.05％以上。 通过添加TiO 2，ZrO 2和/或PbO，可以将折射率nD校正为1.523的标准眼科值。

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