Optical glass

Details Optical glass Optical glass

1992-12-24

1994-04-05

Group, Karl

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 77, 501 79, 501903, C03C 3064, C03C 3093

Patent

active

053004671

ABSTRACT:
An optical glass which is a SiO.sub.2 --B.sub.2 O.sub.3 --(TiO.sub.2 +ZrO.sub.2)--SrO--BaO--R'.sub.2 O system of a specific composition range exhibits optical constants of a refractive index (Nd) of 1.57-1.75 and Abbe number (.nu.d) of 30-55, is free of PbO and has improved stability against devitrification and tinting and improved chemical durability.

REFERENCES:
patent: 4311504 (1982-01-01), Nigrin
patent: 4390638 (1983-06-01), Mennemann et al.
patent: 4481299 (1984-11-01), Tajima
patent: 4562162 (1985-12-01), Sagara

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