Patent ID: 6716781
Filing Date: 2004-04-06
Classification: C03C,Y10S

Abstract:
A lead-free optical glass with an index of refraction (nd) between 1.49 and 1.55 and an AbbÃ© number (&ngr;d) between 47 and 59, wherein said optical glass consists of, in percent by weight on an oxide basis:SiO260 to 70Al2O30.3 to 5â€‚â€‰Na2O16 to 25TiO20 to 9ZrO20 to 7Nb2O5â€‚â€‰0 to 0.4Ta2O50 to 7F0 to 3and optionally at least one fining agent in an amount sufficient for fining.