Focusing system for eye-ground camera

Details Focusing system for eye-ground camera Focusing system for eye-ground camera

1982-02-08

1984-06-05

Corbin, John K.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

354 62, A61B 314, G03B 2900

Patent

active

044525176

ABSTRACT:
The focusing system of the present invention includes an objective lens facing an eye to be examined, an aperture mirror for reflecting the illuminating light, an aperture stop, a photographing lens, a photosensitive lens and a focusing lens provided between said aperture stop and the photographing lens.
The system further comprises a system for directing the beam reflected at the reflecting spot located at the image side of the objective lens or by the aperture mirror or a dichroic mirror located at the image side of the aperture mirror toward the eye ground, and a light-receiving optical system for focusing the beam reflected from the eye ground onto a photosensor through the objective lens, wherein the focusing lens is driven by the output of said photosensor.

REFERENCES:
patent: 3016000 (1962-01-01), Noyori
patent: 3614214 (1971-10-01), Cornsweet et al.
patent: 3925793 (1975-12-01), Matsumura et al.
patent: 3936844 (1976-02-01), Matsumura
patent: 4149787 (1979-04-01), Kobayshi
patent: 4208107 (1980-06-01), Oharek

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