Invention Application
- Patent Title: FUNDUS CAMERA
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Application No.: US13323499Application Date: 2011-12-12
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Publication No.: US20120081665A1Publication Date: 2012-04-05
- Inventor: Hiroshi Itoh , Shinya Tanaka , Motoya Takai
- Applicant: Hiroshi Itoh , Shinya Tanaka , Motoya Takai
- Applicant Address: JP Tokyo
- Assignee: CANON KABUSHIKI KAISHA
- Current Assignee: CANON KABUSHIKI KAISHA
- Current Assignee Address: JP Tokyo
- Priority: JP2008-110939 20080422
- Main IPC: A61B3/14
- IPC: A61B3/14

Abstract:
A fundus camera includes an optical path splitting unit arranged between a focusing unit and an imaging unit. The splitting unit has characteristics adapted to reflect light of a visible light region and to transmit near-infrared light. The splitting unit retreats from an optical path when a still fundus image is photographed. A quick-return mirror having such characteristics is used as the splitting unit. When near-infrared illumination light having a wavelength of about 850 nm is used, such light can be incident upon the imaging unit without loss of the amount of light. Visible light output from an internal fixation target is projected onto a subject's eye. A cornea diaphragm and a crystalline lens diaphragm are used for observing a fundus with invisible light. Each of the cornea diaphragm and crystalline lens diaphragm can be changed to another one having a different diameter.
Public/Granted literature
- US08727533B2 Fundus camera Public/Granted day:2014-05-20
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