Optical glass having an anomalous dispersion

Details Optical glass having an anomalous dispersion Optical glass having an anomalous dispersion

2005-03-15

2005-03-15

Sample, David (Department: 1755)

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

C501S063000, C501S066000, C501S069000, C501S070000, C501S903000

Reexamination Certificate

active

06867157

ABSTRACT:
An optical glass having a positive anomalous dispersion comprises, in mass %,SiO240-60%B2O33-9%TiO2 3-15%Nb2O50.1-5.0%Al2O3 3-15%WO30.5-5.0%MgO0-3%CaO0-3%SrO0-3%BaO0-3%K2Oexceeding 10%and up to 21%Na2O 0-10%Sb2O30-1%and a fluoride or fluorides of a metal element or elements  3-10%,contained in the above metal oxides, a total amount of Fcontained in the fluoride or fluoridesis free of PbO and As2O3except for unavoidable mixing of these compounds as impurities, has optical constants of a refractive index (nd) within the range from 1.48 to less than 1.55 and an Abbe number (νd) within the range from 45 to 55, and has an anomalous dispersion (Δθg,F) of +0.0010 or over.

REFERENCES:
patent: 4055435 (1977-10-01), Sagara
patent: 4084978 (1978-04-01), Sagara
patent: 4719186 (1988-01-01), Mennemann et al.
patent: 20030040424 (2003-02-01), Wolff et al.
patent: 973 350 (1960-01-01), None
patent: 32 06 227 (1983-09-01), None
patent: 197 38 428 (1998-08-01), None
patent: 2 313 328 (1976-12-01), None
patent: 2 115 403 (1983-09-01), None
Patent Abstract of Japan vol. 1997 No. 03 Mar. 31, 1997 & JP 08 290936.

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