Optical glass with refractive indices>1.90, Abbe numbers>2

Details Optical glass with refractive indices>1.90, Abbe numbers>2 Optical glass with refractive indices>1.90, Abbe numbers>2

1984-11-20

1986-04-22

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501901, C03C 3068, C03C 400

Patent

active

045842795

ABSTRACT:
Optical glass with refractive indicies.gtoreq.1.90, Abbe numbers.gtoreq.25 consisting essentially of, in weight percent; 0-10 SiO.sub.2, 2-20 B.sub.2 O.sub.3, 0-2 Al.sub.2 O.sub.3, the sum of SiO.sub.2, B.sub.2 O.sub.3, and Al.sub.2 O.sub.3 being 7.5-25, 1-16 TiO.sub.2, 0-10 ZrO.sub.2, 35-55 La.sub.2 O.sub.3, 0.5-10 Y.sub.2 O.sub.5, 0.5-15 Nb.sub.2 O.sub.5, 0-10 Gd.sub.2 O.sub.3, 0-15 Ta.sub.2 O.sub.5, 0-3 P.sub.2 O.sub.5 wherein the ratio of SiO.sub.2 to B.sub.2 O.sub.3 is between 0.1 and 1.6, and the sum of Nb.sub.2 O.sub.5 and Ta.sub.2 O.sub.5 is from 9 to 20%.

REFERENCES:
patent: 3958999 (1976-05-01), Izumitani et al.
patent: 4118238 (1978-10-01), Ishibashi et al.
patent: 4120732 (1978-10-01), Komorita et al.
patent: 4166746 (1979-09-01), Ishibashi et al.
patent: 4439531 (1984-03-01), Mennemann et al.
patent: 4472511 (1984-09-01), Mennemann et al.

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