Eye fundus camera having automatic exposure control means

Details Eye fundus camera having automatic exposure control means Eye fundus camera having automatic exposure control means

1987-11-13

1989-05-30

Bovernick, Rodney B.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

354 62, A61B 314, G03B 2900

Patent

active

048345261

ABSTRACT:
An eye fundus camera including an illuminating optical system having a photographing light source such as a xenon lamp, and a photographing optical system having an image forming lens and a photographing film plane. A light measuring system is provided and includes a half mirror disposed in the photographing optical system to reflect a part of light passing through the photographing system, the reflected light being received by a photodetector. The signal from the light measuring system is used to control the operation of the xenon lamp to thereby control the exposure. The light measuring system includes a variable aperture device conjugate with the film plane, the aperture device having a plurality of apertures of different diameters so that the field of measurement of light can be changed in accordance with the photographing field.

REFERENCES:
patent: 4429970 (1984-02-01), Fujiwara
patent: 4563070 (1986-01-01), Saito et al.

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