Patent ID: 7754629
Filing Date: 2010-07-13
Classification: C03C,G02B

Abstract:
1. A glass material having a refractive index higher than about 1.70 at 633 nm, having a composition, expressed in mole percentage of the total composition on an oxide basis, wherein the oxides comprise oxides of metal elements, tellurium, bismuth, gallium, and phosphorus, comprising: 20-90% TeO 2 ; 17-40% P 2 O 5 ; 1-30% R 2 O, where R 2 O represents Na 2 O and, optionally, at least one of K 2 O, Rb 2 O, and Cs 2 O; 0-30% RO, where RO represents all alkaline earth metal oxides in total; 5-40% ZnO; 0-15% Bi 2 O 3 ; 0.5-5% Al 2 O 3 ; 0-5% Ga 2 O 3 ; 0.5-15 R 2 O 3 , where R 2 O 3 represents Al 2 O 3 , Bi 2 O 3 and Ga 2 O 3 in total; 0-5% Ln 2 O 3 , where Ln is any metal selected from the group consisting of lanthanoids, Y and Sc; 0-20% Tl 2 O; and 0-30% CdO, and wherein the glass material is free of Li 2 O and PbO.