Optical glass

Details Optical glass Optical glass

2006-11-21

2006-11-21

Lorengo, J. A. (Department: 1755)

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

C501S063000, C501S065000, C501S078000, C501S079000, C501S903000

Reexamination Certificate

active

07138348

ABSTRACT:
An optical glass has optical constants which are an refractive index (nd) of 1.70–1.75 and an Abbe number (vd) of 45.0–54.0; a glass transformation temperature (Tg) of 500–580° C. The glass has the following composition in mass percent of: SiO2more than 5–15%; B2O320-less than 30%; a total amount of SiO2+B2O3more than 25–40%; La2O3more than 21-less than 30%; Y2O3more than 5–15%; Gd2O30-less than 10%; ZrO21–8%; Nb2O50.1–5%; Ta2O5more than 5–12%; a total amount of ZrO2+Nb2O5+Ta2O57–20%; ZnO 0–10%; CaO 0–10%; SrO 0–5%; BaO 0–10%; a total amount of ZnO+CaO+SrO+BaO 5–15%; Li2O 1–8%; Sb2O30–1%; and As2O30–1%. The glass is substantially free of Yb2O3and Al2O3. Devitrification is not generated when the optical glass is kept at a temperature of 920° C. for two hours.

REFERENCES:
patent: 6558316 (2003-05-01), Kikuchi et al.
patent: 6753281 (2004-06-01), Uehara
patent: 6844279 (2005-01-01), Hayashi et al.
patent: 2005/0053788 (2005-03-01), Terashima et al.
patent: 2005/0209085 (2005-09-01), Endo
patent: 54-3115 (1979-01-01), None
patent: 60-221338 (1985-11-01), None
patent: 61-163138 (1986-07-01), None
patent: 10226533 (1998-08-01), None
Derwent Abstract 1998-514986, abstract of JP 10226533 A.
Machine translation of JP 10226533 A.
English Translation of JP 60-221338.
English Translation of JP 61-163138.

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