Optical glass

Details Optical glass Optical glass

2006-08-08

2006-08-08

Lorengo, J. A. (Department: 1755)

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

C501S079000, C501S903000

Reexamination Certificate

active

07087542

ABSTRACT:
There is provided an optical glass suitable for mold pressing having optical constants of a refractive index (nd) within a range from 1.60 to 1.69 and Abbe number (νd) within a range from 35 to 45, having a glass transition point (Tg) within a range from 300° C. to 500° C., being free from devitrification when the optical glass is held at a temperature which is higher by 100° C. than the glass transition point (Tg) for 30 minutes, comprising in mass % on oxide basis:SiO220–less than 40%B2O35–20%Al2O30–5%ZrO2more than 3%–15%Nb2O510–30%MgO + CaO0–less than 5%in which MgO0–less than 5%CaO0–less than 5%SrO0–10%BaO0–10%ZnO0–18%Li2Omore than 5%–15%Na2O1–10%K2O1–10%Sb2O30–1%,and being free from La2O3, TiO2, Ta2O5and PbO.

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