Focusing apparatus for eye-fundus examining instrument

Details Focusing apparatus for eye-fundus examining instrument Focusing apparatus for eye-fundus examining instrument

1980-08-21

1983-11-01

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

044127286

ABSTRACT:
An eye-fundus examining instrument is provided with a phototaking system, an illumination system for illuminating the fundus of an eye, a projecting system for projecting a focus mark and a comparison mark, a finder coupled to the phototaking system for observing therethrough the fundus of the eye, the focus mark and the comparison mark, a linear photosensor array for detecting the focus mark image reflected by the fundus of the eye, a light-receiving system focused to the fundus of the eye simultaneously with the phototaking system and the projecting system, a focusing mechanism for focusing the phototaking system to the fundus of the eye, a manual adjust member for manually driving the focusing mechanism, a servomotor for driving the focusing mechanism, a control circuit for controlling the servomotor by the output of the linear photosensor array, and a switch for selecting the power supply to the control circuit.

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), Kobayashi
patent: 4187014 (1980-02-01), Kato et al.
patent: 4208107 (1980-06-01), Oharek

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