Optical crown glass having negative anomalous partial dispersion

Details Optical crown glass having negative anomalous partial dispersion Optical crown glass having negative anomalous partial dispersion

1993-06-04

1994-08-23

Group, Karl

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 77, 501901, 501903, 501905, C03C 3064, C03C 3145, C03C 408

Patent

active

053407784

ABSTRACT:
An optical crown glass having a negative anomalous partial dispersion .DELTA.P.sub.g,F, a refractive index n.sub.d of greater than 1.52, an Abbe number .nu..sub.d of greater than 57, and a high UV transmission has a composition (in % by weight) 40-72 B.sub.2 O.sub.3, 9-31 Al.sub.2 O.sub.3, 0-15 SiO.sub.2, 0.1-0.5 H.sub.2 O, 0-12 Li.sub.2 O, wherein the total of R.sub.2 O (R=Li, Na, K, Rb, Cs) is 0-20 and the total of MO (M=Mg, Ca, Sr, Ba) is 0-30, and wherein the total of R.sub.2 O and MO is greater than 5, and the molar ratio between Al.sub.2 O.sub.3 and B.sub.2 O.sub.3 is 0.2-0.3 and the molar ratio between (R.sub.2 O+MO) and B.sub.2 O.sub.3 is 0.1-0.4.

REFERENCES:
patent: 3510325 (1965-08-01), Broemer et al.
patent: 3912525 (1975-10-01), Monneraye et al.
patent: 4043852 (1977-08-01), Izumitani et al.
patent: 4642297 (1987-02-01), Mennemann et al.

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