Low refractive optical glass of a flint glass type

Details Low refractive optical glass of a flint glass type Low refractive optical glass of a flint glass type

1992-10-01

1994-06-14

Group, Karl

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 68, 501 69, 501903, C03C 3112

Patent

active

053209850

ABSTRACT:
An optical glass which is a SiO.sub.2 --Nb.sub.2 O.sub.5 --R'.sub.2 O (R' being an alkali metal element)-F system of a specific composition range exhibits optical constants of a refractive index (Nd) of about 1.60 or below and an Abbe number (.nu.d) of about 57-40, is free of PbO and has an improved light transmissivity.

REFERENCES:
patent: 3877953 (1975-04-01), Broemer et al.
patent: 4562161 (1985-12-01), Mennemann et al.
patent: 4719186 (1988-01-01), Mennemann et al.

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