Invention Grant
- Patent Title: Optical medium, an optical lens and a prism
- Patent Title (中): 光学介质，光学透镜和棱镜
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Application No.: US10599452Application Date: 2005-06-22
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Publication No.: US07674737B2Publication Date: 2010-03-09
- Inventor: Kazuo Fujiura , Tadayuki Imai , Masahiro Sasaura , Kouichirou Nakamura
- Applicant: Kazuo Fujiura , Tadayuki Imai , Masahiro Sasaura , Kouichirou Nakamura
- Applicant Address: JP Tokyo
- Assignee: Nippon Telegraph and Telephone Corporation
- Current Assignee: Nippon Telegraph and Telephone Corporation
- Current Assignee Address: JP Tokyo
- Agency: Workman Nydegger
- Priority: JP2004-183966 20040622
- International Application: PCT/JP2005/011433 WO 20050622
- International Announcement: WO2005/124398 WO 20051229
- Main IPC: C04B35/00
- IPC: C04B35/00 ; G02B3/00 ; G02B7/00 ; G02B9/00 ; G02B5/04 ; G02B7/18
Abstract:
An optical medium having a high refractive index without anisotropy and a wide transmission wavelength is obtained. The cubic crystal material is αβO3, where α is at least one of K, Ba, Sr, Ca, and β is at least one of Ta, Ti. Optimally, the cubic crystal material is KTa1-xNbxO3, where composition x is 0≦x≦0.35. This composition enables to raise refractive index while its phase transition temperature is below a room temperature.
Public/Granted literature
- US20070199505A1 Optical Medium, An Optical Lens And A Prism Public/Granted day:2007-08-30
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