Preferably Pb-free and As-free optical glasses with Tg≦500° C.
AssigneeSchott Glas
InventorsSilke Wolff, Ute Woelfel
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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≦νd≦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): 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.
Claims8
Optical glass having a refractive index nd of 1.48≦nd≦1.56, an Abbe number νd of 64≦νd≦72 and a transformation temperature Tg≦500° C., which comprises the following composition (in % by weight):
- SiO2
- 53-58
- B2O3
- 11-15
- Al2O3
- 16-20
- Na2O
- 0-13
- K2O
- 0-13
- ΣM2O
- 9-13
- F
- 0.5-4.
Optical glass having a refractive Index nd of 1.48≦nd≦1.56, an Abbe number νd of 64≦νd≦72 and a transformatIon temperature Tg≦500° C, which comprises the following composition (in % by weight):
- SiO2
- 53-58
- B2O3
- 11-15
- Al2O3
- 16-20
- Na2O
- 0-13
- K2O
- 0-13
- ΣM2O
- 9-13
- F
- 0.5-4
- Sb2O3
- 0-1.
Dependencies are inferred from the claim text.