Automatic focusing means for an ophthalmoscopic instrument

Details Automatic focusing means for an ophthalmoscopic instrument Automatic focusing means for an ophthalmoscopic instrument

1982-04-21

1984-09-04

Corbin, John K.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

354 62, G03B 300, G03B 2900

Patent

active

044694164

ABSTRACT:
An ophthalmoscopic instrument includes a main optical system, with a focusing optical device, for producing an image of the fundus of an eye on an imaging plane, on illuminating optical system for illuminating the fundus, and a target projecting optical system for producing images of a plurality of target marks on the fundus. A photoelectric sensor produces electrical signals based upon the images of the target marks formed on the fundus, and the signals are processed to determine the distances between the images of the target marks. The instrument further includes a circuit for receiving the electrical signals based upon the images of the target marks and discriminating between these electrical signals and anomalous signals, a circuit for controlling the focusing optical device based upon information concerning the distances between the images of the target marks, and a circuit for restricting the focusing optical device when an anomalous signals is detected.

REFERENCES:
patent: 3925793 (1975-12-01), Matsumura et al.

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