Invention Grant
US07827823B2 Optical glass, precision press-molding preform, process for producing the preform, optical element and process for producing the element
有权
光学玻璃，精密压制成型预型件，用于制造预成型件的工艺，光学元件以及用于制造元件的方法
- Patent Title: Optical glass, precision press-molding preform, process for producing the preform, optical element and process for producing the element
- Patent Title (中): 光学玻璃，精密压制成型预型件，用于制造预成型件的工艺，光学元件以及用于制造元件的方法
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Application No.: US12457821Application Date: 2009-06-23
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Publication No.: US07827823B2Publication Date: 2010-11-09
- Inventor: Yoshiko Kasuga , Xuelu Zou
- Applicant: Yoshiko Kasuga , Xuelu Zou
- Applicant Address: JP Tokyo
- Assignee: Hoya Corporation
- Current Assignee: Hoya Corporation
- Current Assignee Address: JP Tokyo
- Agency: Nixon & Vanderhye P.C.
- Priority: JP2004-330047 20041115
- Main IPC: C03B11/00
- IPC: C03B11/00 ; C03C3/066
Abstract:
An optical glass having high refractivity and a low sag temperature and having a low-temperature softening property that enables precision press-molding is provided, and the optical glass contains, by mol %, 5 to 50% of B2O3, 3 to 50% of SiO2, 5 to 40% of TiO2, 1 to 40% of ZnO, 5 to 20% of La2O3, 0 to 10% of Gd2O3, 0 to 15% of Nb2O5, 0 to 10% of ZrO2, 0 to 5% of Ta2O5, 0 to 10% of Bi2O3, 0 to 10% of MgO, 0 to 8% of CaO, 0 to 10% of SrO, 0 to 10% of BaO, provided that the total content of MgO, CaO, SrO and BaO is 15% or less, 0 to 20% of Li2O, and 0 to 5% of Na2O, optionally containing Sb2O3 as a refining agent, and having a refractive index (nd) of 1.8 or more and an Abbe's number (νd) of 35 or less.
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