Optical glass
AssigneesNihon Yamamura Glass Co., Ltd., National Institute of Advanced Industrial Science and Technology
InventorsTatsuo Hidaka, Junichi Nakamura, Takuro Ikeda, Hidekazu Hashima, Kohei Fukumi, Naoyuki Kitamura, Junji Nishii
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Abstract
An optical glass having a high refractive index (particularly preferably a refractive index of 1.6 or more), low dispersion (an Abbe number of 45 or more), a low deformation point, and improved resistance to devitrification upon molding, and suitable for precision-mold press molding or other molding processes and also suitable for transfer of a fine structure is provided. The optical glass contains 1.0-4.5 wt. % SiO2, 30.5-50.0 wt. % B2O3, 1.1-8.0 wt. % Li2O, 10.1-19.5 wt. % BaO, 15.5-30.0 wt. % ZnO, 3.0-15.0 wt. % Y2O3, and 10.0-19.5 wt. % La2O3.
Claims13
An optical glass containing:
- 1.0-4.5 wt. % SiO2,
- 30.5-50.0 wt. % B2O3,
- 1.1-8.0 wt. % Li2O,
- 10.1-19.5 wt % BaO,
- 15.5-30.0 wt. % ZnO,
- 3.0-15.0 wt. % Y2O3 and
- 10.0-19.5 wt. % La2O3.
An optical glass containing:
- 1.0-4.0 wt. % SiO2,
- 34.0-40.0 wt. % B2O3,
- 3.0-8.0 wt. % Li2O,
- 1.0-4.0 wt. % Na2O,
- 11.0-18.0 wt. % BaO,
- 15.5-25.0 wt. % ZnO,
- 3.0-6.0 wt. % Y2O3,
- 10.0-15.0 wt. % La2O3,
- 3.0-8.0 wt. % Gd2O3,
- 0.5-5.0 wt. % ZrO2, and
- 0.5-5.0 wt. % Al2O3.
Dependencies are inferred from the claim text.