Lead- and arsenic-free optical lanthanum flint glasses

Details Lead- and arsenic-free optical lanthanum flint glasses Lead- and arsenic-free optical lanthanum flint glasses

2007-11-20

2007-11-20

Group, Karl E (Department: 1755)

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

C501S079000, C501S903000

Reexamination Certificate

active

11067495

ABSTRACT:
The present invention relates to lead and arsenic free optical glasses, used for the application areas imaging, digital projection, photolithography, laser technology, wafer/chip technology as well as telecommunication, optical communications engineering, optics, illumination and in the automotive sector. The glasses have a refraction power of from 1.73≦nd≦1.82 and an Abbé value of 43≦vd≦53 with good chemical consistency and excellent crystallisation stability with the following composition (in weight-%):SiO20.1-5.5B2O327-35La2O342-48BaO0-5ZnO0.5-5  Y2O3 6-12TiO20-4ZrO2 4-10Nb2O50-5WO3 0-5.

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