Optical light weight glass
First Claim
1. Optical lens of light-weight glass consisting essentially of the following composition in % by weight and having a refractive index (nd) of 1.58 through 1.65, and Abbe number (ν
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d) of 35 through 50 and a specific gravity of 2.69 or less;
space="preserve" listing-type="tabular">______________________________________ SiO.sub.2 47-70 Li.sub.2 O 5.5-21 K.sub.2 O 2-30 Li.sub.2 O + K.sub.2 O 21-50 TiO.sub.2 9.5-24 CaO 0-20 MgO + SrO + BaO + ZnO 0-4 Al.sub.2 O.sub.3 0-5 ZrO.sub.2 + La.sub.2 O.sub.3 + Ta.sub.2 O.sub.5 + WO.sub.3 0-3. ______________________________________
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Accused Products
Abstract
This specification discloses optical light-weight glass having a composition of SiO2 47--70, Li2 O 5.5-21, K2 O 2-30, Na2 O 0-30 (Li2 O+Na2 O+K2 O 21-50), TiO2 9.5-24, B2 O3 0-20, CaO 0-20, MgO+SrO+BaO+ZnO 0-4, Al2 O3 0-5 and ZrO2 +La2 O3 +Ta2 O5 +WO3 0-3, all being in % by weight, and having a refractive index (nd) of 1.58-1.65, an Abbe number (γd) 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.
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Citations
2 Claims
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1. Optical lens of light-weight glass consisting essentially of the following composition in % by weight and having a refractive index (nd) of 1.58 through 1.65, and Abbe number (ν
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d) of 35 through 50 and a specific gravity of 2.69 or less;
space="preserve" listing-type="tabular">______________________________________ SiO.sub.2 47-70 Li.sub.2 O 5.5-21 K.sub.2 O 2-30 Li.sub.2 O + K.sub.2 O 21-50 TiO.sub.2 9.5-24 CaO 0-20 MgO + SrO + BaO + ZnO 0-4 Al.sub.2 O.sub.3 0-5 ZrO.sub.2 + La.sub.2 O.sub.3 + Ta.sub.2 O.sub.5 + WO.sub.3 0-3. ______________________________________ - View Dependent Claims (2)
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d) of 35 through 50 and a specific gravity of 2.69 or less;
Specification