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US 8,476,178 B2Granted
Optical glass
AssigneeHoya Corporation
InventorsXuelu Zou, Yoshio Nojima, Hiroki Takazawa
Life of this patent
Estimating the term…
Abstract
An optical glass comprising, by mass %, 12 to 40% of SiO2, 15% or more but less than 42% of Nb2O5, 2% or more but less than 18% of TiO2, (provided that Nb2O5/TiO2 is over 0.6), 0.1 to 20% of Li2O, 0.1 to 15% of Na2O, and 0.1 to 25% of K2O, and having an Abbe's number νd of 20 to 30, a ΔPg,F of 0.016 or less and a liquidus temperature of 1,200° C. or lower.
Claims13
An optical glass comprising, by mass %,
- 12 to 40% of SiO2,
- 15% or more but less than 42% of Nb2O5,
- 2% or more but less than 12% of TiO2,
- (provided that Nb2O5/TiO2 is over 1.25),
- 0.1 to 20% of Li2O,
- 0.1 to 15% of Na2O,
- 0.1 to 25% of K2O,
- the optical glass having an Abbe's number νd of 20 to 30, a ΔPg,F of 0.016 or less, a liquidus temperature of 1,200° C. or lower and a refractive index nd of 1.82 or more but less than 1.87.
5 more elements
Dependencies are inferred from the claim text.