Invention Grant
- Patent Title: Imaging device, and diffraction grating lens for use in the device
- Patent Title (中): 成像装置和用于装置的衍射光栅透镜
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Application No.: US12524040Application Date: 2008-01-21
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Publication No.: US08045268B2Publication Date: 2011-10-25
- Inventor: Takamasa Ando , Tsuguhiro Korenaga
- Applicant: Takamasa Ando , Tsuguhiro Korenaga
- Applicant Address: JP Osaka
- Assignee: Panasonic Corporation
- Current Assignee: Panasonic Corporation
- Current Assignee Address: JP Osaka
- Agency: Renner, Otto, Boisselle & Sklar, LLP
- Priority: JP2007-016007 20070126
- International Application: PCT/JP2008/050693 WO 20080121
- International Announcement: WO2008/090838 WO 20080731
- Main IPC: G02B5/18
- IPC: G02B5/18 ; G02B27/44
Abstract:
In a refraction lens having an aspheric shape formed thereon and having a positive power, a diffraction grating is formed on at least one of the faces of the refraction lens. In order to reduce the curvature of field and the chromatic aberration in a well-balanced manner, the zonal pitch of the diffraction grating is constituted so as to satisfy the following conditional expression. [ eq . 19 ] 0.21 m 2 v d λ f h max
Public/Granted literature
- US20100110547A1 IMAGING DEVICE, AND DIFFRACTION GRATING LENS FOR USE IN THE DEVICE Public/Granted day:2010-05-06
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