Optical glass

Details Optical glass Optical glass

1997-01-03

1998-04-28

Group, Karl

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 64, 501 66, 501 69, 501 77, 501 78, 501903, C03C 3078, C03C 3089, C03C 3064, C03C 420

Patent

active

057444099

ABSTRACT:
An optical glass containing, as glass components,
30.about.55 wt % of SiO.sub.2,
5.about.30 wt % of B.sub.2 O.sub.3,
the total amount of SiO.sub.2 and B.sub.2 O.sub.3 being 56.about.70 wt % and the SiO.sub.2 /B.sub.2 O.sub.3 weight ratio being 1.3.about.12.0,
7.about.12 wt % of Li.sub.2 O, in which 7 wt % is excluded,
0.about.5 wt % of Na.sub.2 O,
0.about.5 wt % of K.sub.2 O,
the total amount of Li.sub.2 O, Na.sub.2 O and K.sub.2 O being 7 to 12 wt % in which 7 wt % is excluded,
10.about.30 wt % of BaO,
0.about.10 wt % of MgO,
0.about.20 wt % of CaO,
0.about.20 wt % of SrO, and
0.about.20 wt % of ZnO
the total amount of BaO, MgO, CaO, SrO and ZnO being 10.about.30 wt %, and the total amount of SiO.sub.2, B.sub.2 O.sub.3, Li.sub.2 O and BaO being at least 72 wt %.

REFERENCES:
patent: 4460696 (1984-07-01), Harada et al.
patent: 5472918 (1995-12-01), Onozawa

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