| US 7,582,579 B2 | ||
| Phosphate optical glass | ||
| Hiroyuki Ohkawa, Tokyo (Japan); and Naoki Sugimoto, Tokyo (Japan) | ||
| Assigned to Asahi Glass Company, Limited, Tokyo (Japan) | ||
| Filed on Apr. 28, 2008, as Appl. No. 12/110,502. | ||
| Application 12/110502 is a continuation of application No. PCT/JP2006/32117, filed on Oct. 24, 2006. | ||
| Claims priority of application No. 2005-311293 (JP), filed on Oct. 26, 2005. | ||
| Prior Publication US 2008/0207427 A1, Aug. 28, 2008 | ||
| Int. Cl. C03C 3/17 (2006.01); C03C 3/19 (2006.01); C03C 3/21 (2006.01); C03C 3/062 (2006.01) | ||
| U.S. Cl. 501—48 [501/46; 501/47] | 5 Claims |
| 1. A phosphate optical glass comprising, as glass components by mass %, from 1 to 4 mass % of Li2O, 73 to 85 of P2O5, from 14 to 26 of Al2O3, from 1 to 12 of K2O+Li2O, from 0 to 12 of SiO2, from 0 to 12 of B2O3, from 0 to 12 of Na2O, from 0 to 12 of Y2O3, from 0 to 12 of La2O3, from 0 to 12 of MgO+CaO+SrO+BaO, from 0 to 10 of ZrO2+TiO2+Gd2O3, from 0 to 10 of Ta2O5+GeO2+Ga2O3+Nb2O5+WO3+TeO2, from 0 to 2 of Sb2O3, and from 0 to 12 of ZnO+PbO and which has a glass transition point (Tg) of at most 600° C. |