Optical glass, press-molding preform and optical part

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

2007-09-21

2008-12-23

Lorengo, J. A. (Department: 1793)

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

C501S051000, C501S078000, C501S079000

Reexamination Certificate

active

07468338

ABSTRACT:
A high-refractivity low-dispersion optical glass that gives press-molding preforms excellent in high-temperature shapability and suitable for precision press-molding, including an optical glass comprising B2O3, La2O3, Gd2O3and ZnO as essential components, substantially containing none of lead and fluorine, having a refractive index (nd) of 1.72 to 1.83, an Abbe's number (νd) of 45 to 55 and a glass transition temperature (Tg) of 630° C. or lower and having a viscosity of at least 0.6 Pa·s at its liquidus temperature, and an optical glass comprising, by mol %, 45 to 65% of B2O3, 5 to 22% of La2O3, 1 to 20% of Gd2O3, provided that the total content of La2O3and Gd2O3is 14 to 30%, 5 to 30% of ZnO, 0 to 10% of SiO2, 0 to 6.5% of ZrO2and 0 to 1% of Sb2O3, substantially containing none of lead and fluorine, and having a refractive index (nd) of 1.72 to 1.83 and an Abbe's number (νd) of 45 to 55.

REFERENCES:
patent: 3958999 (1976-05-01), Izumitani et al.
patent: 4111707 (1978-09-01), Komorita et al.
patent: 4584279 (1986-04-01), Grabowski et al.
patent: 4798768 (1989-01-01), Oversluizen et al.
patent: 6251813 (2001-06-01), Sato
patent: 6413894 (2002-07-01), Sato
patent: 6844279 (2005-01-01), Hayashi et al.
patent: 6977232 (2005-12-01), Hayashi et al.
patent: 1068661 (1993-02-01), None
patent: 27 56 161 (1979-06-01), None
patent: 3102690 (1992-06-01), None
patent: 199 19 304 (1999-11-01), None
patent: 100 53 388 (2001-05-01), None
patent: 48-37410 (1973-06-01), None
patent: 48-61517 (1973-08-01), None
patent: 60-221338 (1985-11-01), None
patent: 4-92835 (1992-03-01), None
patent: 05-058669 (1993-03-01), None
patent: 08-026766 (1996-01-01), None
patent: 8-276765 (1996-01-01), None
patent: 8-59282 (1996-03-01), None
patent: 2000-016831 (2000-01-01), None
patent: 2002-128539 (2002-05-01), None
Machine translation of JP 08-026765, date unknown.

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