| Original document(32 pages) Authorized document(31 pages) 中文版 |
Disclosed is an optical glass comprising, expressed as weight percentages, greater than or equal to 18 percent and less than 30 percent of SiO2, greater than or equal to 12 percent and less than 23 percent of BaO, 22 to 37 percent TiO2, greater than or equal to 7 percent and less than 16 percent Nb2O5, 5 to 20 percent of Na2O, 0 to 6 percent of K2O, 0 to 5 percent of CaO, 0 to 5 percent of SrO, 0 to 4 percent of ZrO2, 0 to 3 percent of Ta2O5, 0 to 1 percent of Sb2O5, and greater than or equal to 0 percent and less than 0.5 percent of P2O5, and by essentially not comprising PbO, As2O3, and F. The optical glass exhibits a refractive index (nd) greater than or equal to 1.80 and an Abbe number (vd) less than or equal to 30, the number density of precipitated crystal grain less than or equal to 12/mm<3>. A transparent and high quality press molded article can be produced even from glass that tends to easily loose transparency by the method for preparing press molding by heating and melting the said glass material for molding and press molding. |
Application Number
申请号 |
02147548 |
Application Date
申请日 |
2002.10.15 |
| Title 名称 |
Optical glass, glass raw material and optics component for press moulding and making method thereof |
Publication Number
公开号 |
1418837 |
Publication Date
公开日 |
2003.05.21 |
| Approval Pub. Date |
2006.11.08 |
Granted Pub. Date |
2006.11.08 |
| International Classification 分类号 |
C03C4/00;C03C3/062;G02B1/00;C03B11/00;C03B25/00 |
Applicant(s) Name
申请人 |
Hoya Corp. |
| Address 地址 |
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| Inventor(s) Name 发明人 |
Kasuga Yoshiko;Tatsukazu Nazuichiro;Yanata Hiroaki |
| Attorney & Agent 代理人 |
liu zongjie ye kaidong |
| More information 更 多 信 息 |
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