Optical glass, preform for press molding and optical part

Details Optical glass, preform for press molding and optical part Optical glass, preform for press molding and optical part

2005-12-20

2005-12-20

Group, Karl (Department: 1755)

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

C501S051000, C501S050000, C501S064000

Reexamination Certificate

active

06977232

ABSTRACT:
Provided is an optical glass that has high-refractivity and high-dispersion properties and can give preforms for press-molding, which are excellent in shapability at high temperatures and suitable for precision press-molding.The optical contains, as essential components, 25 to 45 mol % of B2O3, 2 to 20 mol % of SiO2, 5 to 22 mol % of La2O3, 2 to 20 mol % of Gd2O3, 15 to 29 mol % of ZnO, 1 to 10 mol % of Li2O and 0.5 to 8 mol % of ZrO2, the optical glass having a B2O3/SiO2molar ratio of from 2 to 5.5 and having an La2O3and Gd2O3total content of 12 to 24 mol % and a ZnO and Li2O total content of 25 to 30 mol %, the optical glass having a refractive index (nd) of 1.75 to 1.85 and an Abbe's number (νd) of 40 to 55, or the optical glass contains, as essential components, B2O3, SiO2, La2O3, Gd2O3, ZnO, Li2O and ZrO2and has a viscosity of at least 6 dPa·s at a liquidus temperature thereof, a glass transition temperature (Tg) of 600° C. or lower, a refractive index (nd) of 1.75 to 1.85 and Abbe's number (νd) of 40 to 55.

REFERENCES:
patent: 3811901 (1974-05-01), Bacon
patent: 4111707 (1978-09-01), Komorita et al.
patent: 4226627 (1980-10-01), Inoue et al.
patent: 4732876 (1988-03-01), Nagamine et al.
patent: 4742028 (1988-05-01), Boudot et al.
patent: 6251813 (2001-06-01), Sato
patent: 6558316 (2003-05-01), Kikuchi et al.
patent: 6645894 (2003-11-01), Endo
patent: 2003/0050177 (2003-03-01), Uehara
patent: 2003/0125186 (2003-07-01), Hayashi et al.
patent: 62100449 (1987-05-01), None
patent: 06-305769 (1994-11-01), None
Derwent Abstract 1987-167506 of JP 62-100449.

Affiliated with

Also associated with

Rating

Optical glass, preform for press molding and optical part does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Optical glass, preform for press molding and optical part, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical glass, preform for press molding and optical part will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3494461