US 7,524,781 B2
	Non-lead optical glass and optical fiber
Tatsuo Nagashima, Yokohama (Japan); Naoki Sugimoto, Yokohama (Japan); Seiki Ohara, Yokohama (Japan); and Tomoharu Hasegawa, Yokohama (Japan)
Assigned to Asahi Glass Company, Limited, Tokyo (Japan)
Filed on Dec. 20, 2005, as Appl. No. 11/311,559.
Application 11/311559 is a continuation of application No. PCT/JP2004/004199, filed on Mar. 25, 2004.
Claims priority of application No. 2003-176110 (JP), filed on Jun. 20, 2003.
Prior Publication US 2006/0100084 A1, May 11, 2006
Int. Cl. C03C 3/15 (2006.01); C03C 3/14 (2006.01)

U.S. Cl. 501—50  [501/37; 501/41; 501/49; 501/51; 501/52]

5 Claims

1. A non-lead optical glass having a refractive index of at least 2.10 at a wavelength of 1,550 nm, consisting essentially of, as represented by mol % based on the following oxides, from 45 to 75% of Bi2O3, from 12 to 45% of B2O3, from 1 to 20% of Ga2O3, from 1 to 20% of In2O3, from 0 to 20% of ZnO, from 0 to 15% of BaO, from 0 to 2.99% of SiO2+Al2O3+GeO2, from 0 to 15% of MgO+CaO+SrO, from 0 to 10% of SnO2+TeO2+TiO2+ZrO2+Ta2O3+Y2O3+WO3 and from 0 to 5% of CeO2, wherein Ga2O3+In2O3+ZnO is at least 5%.