Eye fundus photographing apparatus and eye fundus camera for cha

Details Eye fundus photographing apparatus and eye fundus camera for cha Eye fundus photographing apparatus and eye fundus camera for cha

1993-09-02

1995-08-29

Sikes, William L.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351214, 351221, 354 62, A61B 312, A61B 314

Patent

active

054465095

ABSTRACT:
This invention relates to an eye fundus photographing apparatus for photographing the fundus of an eye to be examined. The eye fundus photographing apparatus has an optical system for illuminating the fundus of the eye to be examined and also causing the illuminated fundus of the eye to be examined to be photographed at different photographing magnifications. Also provided is an operating mechanism for changing the photographing magnification. The photographing magnification is changed by the operating mechanism being operated in a predetermined manner. In addition, an interlocking device is provided for varying a portion of the optical system without changing the photographing magnification, by the operation of the operating mechanism succeeding to the operation of the operating mechanism for changing the photographing magnification by the optical system.

REFERENCES:
patent: 4235540 (1980-11-01), Hanamura et al.
patent: 4265518 (1981-05-01), Matsumura
patent: 4436388 (1984-03-01), Takahashi et al.
patent: 4558932 (1985-12-01), Nunokawa
patent: 4679919 (1987-07-01), Itoh et al.
patent: 4799783 (1989-01-01), Takahashi et al.

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