Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1981-04-10
1984-03-13
Corbin, John K.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
354 62, 351208, A61B 314
Patent
active
044363885
ABSTRACT:
An eye-fundus camera provides change-over and selection between automatic focusing and manual focusing. The eye-fundus camera includes a projector, a photo-sensor array, a focus controller and an illuminator. The projector projects a first focus mark and a second focus mark on the fundus of an eye to be examined. The photo-sensor array detects the first focus mark reflected from the fundus and the output from the sensor array is introduced into the controller to adjust the focus of the camera. The illuminator illuminates the fundus uniformly with light within a first wavelength range. The first focus mark is with light within the first wavelength range and within a second wavelength range other than the first one whereas the second focus mark is formed only of light within the first wavelength range. The eye-fundus camera further comprises a wavelength selecting mirror which cuts off light of the first wavelength range among rays of light incident upon the photo-sensor array.
REFERENCES:
patent: 3614214 (1971-10-01), Cornsweet
patent: 3925793 (1975-12-01), Matsumura
patent: 4264153 (1981-04-01), Ito
Itoh Yuji
Sakane Toshio
Takahashi Jun-ichi
Bovernick Rodney B.
Canon Kabushiki Kaisha
Corbin John K.
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