Optical glass with refractive indexes of 1.60-1.69 and Abbe numb

Details Optical glass with refractive indexes of 1.60-1.69 and Abbe numb Optical glass with refractive indexes of 1.60-1.69 and Abbe numb

1983-01-17

1987-02-10

Bell, Mark

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501903, C03C 308, C03C 330

Patent

active

046422978

ABSTRACT:
Optical glass compositions having refractive indexes of 1.60-1.69 and Abbe numbers higher than 54 as well as with a density of less than 3.4 g/cm.sup.3, and which are distinguished in that they have good chemical stability, comprising (in percent by weight): 5-30 percent SiO.sub.2 ; 20-55 percent B.sub.2 O.sub.3 ; 13-40 percent CaO; 3-25 percent La.sub.2 O.sub.3 ; and optionally one or more of the following: up to 7 percent ZrO.sub.2, up to 2 percent TiO.sub.2, up to 9 percent Al.sub.2 O.sub.3, up to 11 percent MgO, up to 10 percent ZnO, up to 10 percent SrO, and up to 12 percent BaO.

REFERENCES:
patent: 2745757 (1956-05-01), Geffcken
patent: 3248238 (1966-04-01), Faulstich
patent: 3510325 (1970-05-01), Broemer et al.
patent: 3958999 (1976-05-01), Izumitani et al.
patent: 4055435 (1977-10-01), Sagara

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