Optical light weight glass

Details Optical light weight glass Optical light weight glass

1985-07-17

1989-03-14

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 63, 501 65, 501 66, 501 67, 501 68, 501 69, 501 70, 501 72, 501903, C03C 3076, C03C 400

Patent

active

048124230

ABSTRACT:
This specification discloses optical light-weight glass having a composition of SiO.sub.2 47--70, Li.sub.2 O 5.5-21, K.sub.2 O 2-30, Na.sub.2 O 0-30 (Li.sub.2 O+Na.sub.2 O+K.sub.2 O 21-50), TiO.sub.2 9.5-24, B.sub.2 O.sub.3 0-20, CaO 0-20, MgO+SrO+BaO+ZnO 0-4, Al.sub.2 O.sub.3 0-5 and ZrO.sub.2 +La.sub.2 O.sub.3 +Ta.sub.2 O.sub.5 +WO.sub.3 0-3, all being in % by weight, and having a refractive index (n.sub.d) of 1.58-1.65, an Abbe number (.gamma..sub.d) of 35-50 and a specific gravity of 2.69 or less. This optical glass is light in weight, high in transparency and low in dispersion, and is particularly suitable for spectacle lenses, but can also be utilized for photographic lenses.

REFERENCES:
patent: 3898093 (1975-08-01), Faulstich et al.
patent: 4012131 (1977-03-01), Krohn et al.
patent: 4036623 (1977-07-01), Deeg et al.
patent: 4084978 (1978-04-01), Sagara
patent: 4149895 (1979-04-01), Doudot et al.
patent: 4367012 (1983-01-01), Ikeda et al.
patent: 4540672 (1985-09-01), Boudot et al.

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