Highly refractive, low dispersion, low density optical glass sui

Details Highly refractive, low dispersion, low density optical glass sui Highly refractive, low dispersion, low density optical glass sui

1982-06-11

1984-04-24

McCarthy, Helen M.

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

351168, 501903, C03C 304, C03C 310

Patent

active

044448937

ABSTRACT:
An optical quality glass suitable for use in ophthalmic lenses having a refractive index of at least 1.59, an Abbe number of at least 40.5, a density of no greater than 2.67 g/cm.sup.-3, and a coefficient of thermal expansion .alpha. of less than 90.times.10.sup.-7 per .degree.C. contains at least 90 mole % of SiO.sub.2, Li.sub.2 O, Na.sub.2 O, K.sub.2 O, CaO, and TiO.sub.2, and essentially does not contain Al.sub.2 O.sub.3, B.sub.2 O.sub.3, or oxides of elements having atomic weights above 90, such as Nb.sub.2 O.sub.5, La.sub.2 O.sub.3, or ZrO.sub.2.

REFERENCES:
patent: 2554952 (1951-05-01), Mockrin et al.
patent: 2566134 (1951-08-01), Mockrin et al.
patent: 3589918 (1971-06-01), Jahn
patent: 4001019 (1977-01-01), Yamashita et al.

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