Fundus imaging apparatus

Details Fundus imaging apparatus Fundus imaging apparatus

2008-09-25

2011-11-15

Greece, James (Department: 2873)

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

C351S205000

Reexamination Certificate

active

08057039

ABSTRACT:
A fundus imaging apparatus comprises: an irradiation optical system comprising a light source which emits a laser beam and a scanner which two-dimensionally scans the laser beam on a fundus of an examinee's eye, the irradiation optical system being adapted to focus the laser beam emitted from the light source on the fundus to form a confocal region; an imaging optical system comprising a photo-receiving element which receives reflection light of the laser beam reflected from the fundus, the imaging optical system being adapted to focus the reflection light from the fundus and receive the reflection light by the photo-receiving element; and a beam restriction member placed in an optical path of the imaging optical system, the beam restriction member comprising: one of an opening through which part of the reflection light from the fundus outside the confocal region is allowed to pass toward the photo-receiving element and a mirror part which reflects the part of the reflection light from the fundus outside the confocal region toward the photo-receiving element; and a light shielding part which shields the reflection light from the fundus in the confocal region and the part of the reflection light from the fundus outside the confocal region. The light shielding part includes a first light shielding part placed in a conjugate position with a focus point of the laser beam on the fundus and a second light shielding part placed in a nearly conjugate position with the fundus and adapted to shield part of an optical path of the reflection light, the second light shielding part is formed around the first light shielding part.

REFERENCES:
patent: 6224212 (2001-05-01), Noda et al.
patent: 6404545 (2002-06-01), Ishiwata
patent: 2002/0060298 (2002-05-01), Endo et al.
patent: 2004/0051847 (2004-03-01), Vilser
patent: A2000-126134 (2000-05-01), None
patent: A2007-89828 (2007-04-01), None
patent: WO 2006/076772 (2006-07-01), None

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