Fundus camera

Details Fundus camera Fundus camera

2011-08-23

2011-08-23

Hasan, Mohammed (Department: 2873)

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

C351S205000

Reexamination Certificate

active

08002411

ABSTRACT:
A fundus camera includes a fundus photographing optical system including an image-recording image sensor for photographing a fundus image via a focusing lens, a focus target having a plurality of regions for forming light fluxes passing through a plurality of different areas on pupil of a subject's eye, and a focus drive unit for driving the focusing lens based on positions of a plurality of images of the focus target in an image captured by the image-recording image sensor and on contrast of the images.

REFERENCES:
patent: 4412728 (1983-11-01), Sakane et al.
patent: 4469416 (1984-09-01), Isono
patent: 5196872 (1993-03-01), Beesmer et al.
patent: 5572266 (1996-11-01), Ohtsuka
patent: 5-95907 (1993-04-01), None
patent: 8-275921 (1996-10-01), None

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