发明名称 |
An optical glass for precision molding |
摘要 |
The present invention provides a high refractive index, high dispersion optical glass for precision molding, being free from harmful materials causing environmental problems, such as lead oxide, etc., and having a low yield temperature, a refractive index (nd) of at least 1.83 and an Abbe number (vd) of at most 26.0 and further providing a low softening property as well as an improved mass production property with less coloration, which is represented in terms of for making up the glass, by the following chemical composition (wt%) : P 2 O 5 15 to 29 % B 2 O 3 0 to 2 % GeO 2 0 to 14 % Sum of P 2 O 5 + B 2 O 3 + GeO 2 20 to 35 % Li 2 O 0 to 5 % Na 2 O 3 to 14 % K 2 O 0 to 9 % Sum of Li 2 O + Na 2 O + K 2 O 5 to 15 % Nb 2 O 5 2 to less than 22 % Bi 2 O 3 34 to 60 % WO 3 0 to 5 % BaO 0 to 5 % In 2 O 3 0 to 7 % |
申请公布号 |
EP1555248(B1) |
申请公布日期 |
2015.01.14 |
申请号 |
EP20040256212 |
申请日期 |
2004.10.07 |
申请人 |
SUMITA OPTICAL GLASS, INC. |
发明人 |
YAMAMOTO, YOSHINORI;SAWANOBORI, NARUHITO;NAGAHAMA, SHINOBU |
分类号 |
C03C3/253;C03C3/16;C03C3/19;C03C3/21 |
主分类号 |
C03C3/253 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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