Invention Grant
- Patent Title: Optical glass, hot-molded article and method of manufacturing the same, optical element and method of manufacturing the same
- Patent Title (中): 光学玻璃，热成型品及其制造方法，光学元件及其制造方法
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Application No.: US14766270Application Date: 2014-02-06
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Publication No.: US09434637B2Publication Date: 2016-09-06
- Inventor: Masanori Aniya
- Applicant: HOYA CORPORATION
- Applicant Address: JP Tokyo
- Assignee: HOYA CORPORATION
- Current Assignee: HOYA CORPORATION
- Current Assignee Address: JP Tokyo
- Agency: Oliff PLC
- Priority: JP2013-021338 20130206
- International Application: PCT/JP2014/052799 WO 20140206
- International Announcement: WO2014/123200 WO 20140814
- Main IPC: C03C3/155
- IPC: C03C3/155 ; C03C3/19 ; C03C3/21 ; C03C3/15 ; C03C3/068 ; C03B23/00 ; G02B1/00 ; G02B3/02 ; C03B40/04 ; C03B11/12 ; G02B3/00 ; G02B5/04 ; G02B5/18
Abstract:
An optical glass includes P2O5, B2O3 and a rare earth oxide as essential components, and in a glass composition based on oxides, the P2O5 content is in the range of over 0 weight % and less than 0.79 weight %, the B2O3 content is in the range of 20-40 weight % and the total content of the rare earth oxide and an oxide selected from the group including of Ta2O5, WO3, TiO2, Nb2O5 and Bi2O3 is in the range of 35-70 weight %. Further, this optical glass has a refractive index (nd) in the range of 1.72-1.83, an Abbe number (υd) in the range of 45-55 and a glass transition temperature (Tg) of 640° C. or less.
Public/Granted literature
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