US 2004/0132606 A1 · Preferably Pb-free and As-free optical glasses with Tg less than or equal to 500 degree centigrade

Abstract

The present invention relates to preferably lead-free and arsenic-free optical glasses, having a refractive index of 1.48≦nd≦1.56, an Abbe number of 64 ≦vd≦72, a low transformation temperature (Tg≦500° C.) and good ion exchange properties, as well as good chemical resistance and crystallization stability, and comprising the following composition (in % by weight): 1 SiO2 53-58 B2O3 11-15 Al2O3 16-20 Na2O 0-13 K2O 0-13 ΣM2O 9-13 F 0.5-4 The glass may additionally contain standard refining agents. The invention also relates to the use of the optical glasses according to the invention in the application areas of imaging, projection, telecommunications, optical communication technology and/or laser technology.

Claims5

Dependent claims

Optical glass having a refractive index nd of 1.48 ≦nd≦1.56, an Abbe number Vd of 64≦Vd≦72 and a transformation temperature Tg≦500° C., which comprises the following composition (in % by weight):

8 SiO2 53-58 B2O3 11-15 Al2O3 16-20 Na2O 0-13 K2O 0-13 ΣM2O 9-13 F 0.5-4

Dependencies are inferred from the claim text.

Facts

Application

10/725,846Filed 2 Dec 2003

Priority

DE 102 56 629.13 Dec 2002

Published

8 Jul 2004

Term ends

Not estimatedThe source records don’t support an estimate.

Classification5 codes

C03C 3/118
Containing boron: containing aluminium
Y10S 501/902
Optical glass, e.g. silent on refractive index and/or ABBE number: having ABBE number at least 70
Y10S 501/903
Optical glass, e.g. silent on refractive index and/or ABBE number: having refractive index less than 1.8 and ABBE number less than 70
C03C
Chemical composition of glasses, glazes or vitreous enamels

Preferably Pb-free and As-free optical glasses with Tg less than or equal to 500 degree centigrade

Life of this patent

Preferably Pb-free and As-free optical glasses with Tg less than or equal to 500 degree centigrade

Life of this patent

Abstract

Claims5