Patent ID: 7309670
Filing Date: 2007-12-18
Classification: C03C,Y10S

Abstract:
1. An optical glass for precision press molding characterized by comprising essential components in the form of P 2 O 5 , Nb 2 O 5 , WO 3 , TiO 2 , Bi 2 O 3 , Li 2 O, and Na 2 O; comprising optional components in the form of B 2 O 3 , BaO, ZnO, K 2 O, Sb 2 O 3 , and As 2 O 3 ; where the content of Bi 2 O 3 is equal to or greater than 0.5 molar percent, but does not exceed 15 molar percent; the content of Li 2 O is from 2 to 25 molar percent; the combined quantity of Nb 2 O 5 , WO 3 , TiO 2 , and Bi 2 O 3 is from 25 to 45 molar percent; the combined quantity of Li 2 O, Na 2 O, and K 2 O is less than or equal to 42 molar percent; the combined quantity of the essential components and optional components is greater than or equal to 98 molar percent; the refractive index (nd) is from 1.75 to 2.0; and the Abbé number (νd) is from 18 to 30.