Invention Grant
US07670978B2 Optical glass, precision press molding preform and optical element
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光学玻璃，精密压模成型预制件和光学元件
- Patent Title: Optical glass, precision press molding preform and optical element
- Patent Title (中): 光学玻璃，精密压模成型预制件和光学元件
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Application No.: US11494506Application Date: 2006-07-28
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Publication No.: US07670978B2Publication Date: 2010-03-02
- Inventor: Yoshiko Kasuga , Mikio Ikenishi , Xuelu Zou
- Applicant: Yoshiko Kasuga , Mikio Ikenishi , Xuelu Zou
- Applicant Address: JP Tokyo
- Assignee: Hoya Corporation
- Current Assignee: Hoya Corporation
- Current Assignee Address: JP Tokyo
- Agency: Sughrue Mion, PLLC
- Priority: JP2005-221423 20050729
- Main IPC: C03C3/066
- IPC: C03C3/066 ; C03C3/068
Abstract:
The optical glass has a refractive index of equal to or greater than 1.65 and an Abbé number ranging from 50 to 60. In the optical glass, as molar basis, a ratio of SiO2 content to B2O3 content is greater than 0.5 and equal to or less than 0.90; a total content of SiO2 and B2O3 ranges from 50 to 70 percent; Li2O content ranges from 5 to 20 percent; La2O3 content ranges from 0.5 to 22 percent; a ratio of ZnO content to RO (MgO, CaO, SrO and BaO) is equal to or greater than 0.5; a total content of Gd2O3, Y2O3 and Yb2O3 ranges from 1 to 15 percent; Sb2O3 content ranges from 0 to 1 percent; and no BaO is comprised, or a ratio of the total content of La2O3, Gd2O3, Y2O3 and Yb2O3 to the content of BaO is equal to or greater than 10.
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