Invention Grant
- Patent Title: Optical glass, precision press-molding preform, process for the production thereof, optical element and process for the production of the element
- Patent Title (中): 光学玻璃，精密压制成型预成型件，其制造方法，光学元件和元件的制造方法
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Application No.: US11512420Application Date: 2006-08-30
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Publication No.: US07655585B2Publication Date: 2010-02-02
- Inventor: Kazutaka Hayashi
- Applicant: Kazutaka Hayashi
- Applicant Address: JP Tokyo
- Assignee: Hoya Corporation
- Current Assignee: Hoya Corporation
- Current Assignee Address: JP Tokyo
- Agency: Nixon & Vanderhye P.C.
- Priority: JP2005-251207 20050831
- Main IPC: C03C3/155
- IPC: C03C3/155 ; C03C3/14 ; C03C3/145 ; C03C3/066 ; C03C3/15
Abstract:
Provided is a precision press-molding optical glass that is not easily degraded in quality by the occurrence of an altered layer such as fogging or yellowing on a surface and that comprises B2O3, ZnO, La2O3 and ZrO2 and contains, by mol %, 0 to less than 0.5% of Li2O, 20 to 50% of B2O3, 0 to 20% of SiO2, 22 to 42% of ZnO, 5 to 24% of La2O3, 0 to 20% of Gd2O3, provided that the total content of La2O3 and Gd2O3 is 10 to 24%, 0.5 to 10% of ZrO2, 0 to 15% of Ta2O5, 0 to 20% of WO3, 0 to 15% of Nb2O5, 0 to 20% of TiO2, 0 to 10% of Bi2O3, 0 to 10% of GeO2, 0 to 10% of Ga2O3, 0 to 10% of Al2O3, 0 to 10% of BaO, 0 to 10% of Y2O3 and 0 to 10% of Yb2O3, the optical glass having an Abbe's number (νd) of at least 35 but less than 40.
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