Optical glass having a negative anomalous dispersion

Details Optical glass having a negative anomalous dispersion Optical glass having a negative anomalous dispersion

1998-03-12

1999-09-14

Marcheschi, Michael

Compositions: ceramic

Optical glass

Having refractive index less than 1.8 and abbe number less...

501 63, 501 65, 501 67, 501 70, 501 77, 501 78, 501 79, C03C 3064, C03C 3089, C03C 400, C03C 3097

Patent

active

059522569

ABSTRACT:
An optical glass has a large negative anomalous dispersion value and optical constants of refractive index (nd) within a range of 1.65-1.80 and Abbe number (.nu.d) within a range of 28-42. The optical glass includes, as its essential ingredients, in weight percent, 20-50% SiO.sub.2, 6-20% B.sub.2 O.sub.3 where SiO.sub.2 /B.sub.2 O.sub.3 .ltoreq.6, 0.5-15% ZrO.sub.2 and 31-50% Nb.sub.2 O.sub.5.

REFERENCES:
patent: 3870531 (1975-03-01), Jahn
patent: 3877953 (1975-04-01), Broemer et al.
patent: 4084978 (1978-04-01), Sagara
patent: 4200467 (1980-04-01), Broemer et al.
patent: 4612295 (1986-09-01), Sagara
patent: 5332700 (1994-07-01), Yamaguchi et al.

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