Optical glasses and their uses

摘要

The optical glass has an index of refraction (nd) greater than or equal to 1.70, an Abbé number (nud) greater than or equal to 35 and a density (rho) less than or equal to 4.5 g/cm3. Optical elements made with this optical glass are especially desirable in optical data transfer applications, particularly in read-write devices with movable read-write heads. The glass compositions required to make optical glass with these properties are described.