Patent ID: 7524781
Filing Date: 2009-04-28
Classification: C03C,G02B

Abstract:
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 Bi 2 O 3 , from 12 to 45% of B 2 O 3 , from 1 to 20% of Ga 2 O 3 , from 1 to 20% of In 2 O 3 , from 0 to 20% of ZnO, from 0 to 15% of BaO, from 0 to 2.99% of SiO 2 +Al 2 O 3 +GeO 2 , from 0 to 15% of MgO+CaO+SrO, from 0 to 10% of SnO 2 +TeO 2 +TiO 2 +ZrO 2 +Ta 2 O 3 +Y 2 O 3 +WO 3 and from 0 to 5% of CeO 2 , wherein Ga 2 O 3 +In 2 O 3 +ZnO is at least 5%.