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US 2008/0176734 A1Published application
Optical glass and optical element
AssigneeKonica Minolta Opto, Inc.
InventorAkio Oogaki
Life of this patent
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Abstract
An optical glass contains as glass ingredients, by weight: 0-8% SiO2; 34.5-46% B2O3; 2.6-6% Li2O; 21-38% ZnO; 0-40% La2O3; 0-35% Gd2O3; and 0-15% Y2O3, with the total content of La2O3+Gd2O3+Y2O3 accounting for 10-40%. The optical glass also has a predetermined index of refraction and a predetermined dispersion.
Claims9
An optical glass comprising as glass ingredients, by weight:
- 0-8% SiO2;
- 34.5-46% B2O3;
- 2.6-6% Li2O;
- 21-38% ZnO;
- 0-40% La2O3;
- 0-35% Gd2O3;
- and
- 0-15% Y2O3,
- with a total content of La2O3+Gd2O3+Y2O3 accounting for 10-40%.
6 more elements
Dependencies are inferred from the claim text.