Invention Grant
US08349749B2 Optical glass, preform for precision press molding, optical element and method of manufacturing thereof
有权
光学玻璃，精密加压成型用预成型体，光学元件及其制造方法
- Patent Title: Optical glass, preform for precision press molding, optical element and method of manufacturing thereof
- Patent Title (中): 光学玻璃，精密加压成型用预成型体，光学元件及其制造方法
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Application No.: US13230914Application Date: 2011-09-13
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Publication No.: US08349749B2Publication Date: 2013-01-08
- Inventor: Yasuhiro Fujiwara
- Applicant: Yasuhiro Fujiwara
- Applicant Address: JP Tokyo
- Assignee: Hoya Corporation
- Current Assignee: Hoya Corporation
- Current Assignee Address: JP Tokyo
- Agency: Sughrue Mion, PLLC
- Priority: JP2006-089116 20060328
- Main IPC: C03C3/15
- IPC: C03C3/15 ; C03C3/068 ; C03B11/00
Abstract:
An optical glass having a refractive index nd of 1.70 or greater and an Abbé number of 50 or greater. Given as mole percentages, it comprises: B2O3 (20 to 80 percent), SiO2 (0 to 30 percent), Li2O (1 to 25 percent), ZnO (0 to 20 percent), La2O3 (4 to 30 percent), Gd2O3 (1 to 25 percent), Y2O3 (0 to 20 percent), ZrO2 (0 to 5 percent), MgO (0 to 25 percent), CaO (0 to 15 percent), and SrO (0 to 10 percent), with the combined quantity of the above components being 97 percent or greater. The molar ratio of {ZnO/(La2O3+Gd2O3+Y2O3)} is 0.8 or less and the molar ratio of {(CaO+SrO+BaO)/(La2O3+Gd2O3+Y2O3)} is 0.8 or less. Ta2O5 may be incorporated as an optional component, with the molar ratio {(ZrO2+Ta2O5)/(La2O3+Gd2O3+Y2O3)} being 0.4 or less.
Public/Granted literature
- US08314042B2 Optical glass, preform for precision press molding, optical element and method of manufacturing thereof Public/Granted day:2012-11-20
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