Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Folding
Patent
1978-08-04
1981-01-27
Corbin, John K.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Folding
354 62, A61B 314, G03B 2900
Patent
active
042471761
ABSTRACT:
In the apparatus disclosed a photographic system is composed of an objective lens and an image forming lens. An illumination system has a part of its light path in common with the photographic system. In the latter the photographic picture angle is adjusted by mounting an attachment lens in front of the objective lens or exchanging the front component lens of the objective lens for an attachment lens. In the illuminating system a masking plate forms a shadow on the pupil of the eye and has a transparent domain. The masking plate is exchanged for another one with a different size of transparent domain when mounting and exchanging the attachment lens. By forming the attachment lens as a positive aplanatic lens or a negative aplanatic lens various aberrations taking place in the illumination light beam and the photographing light beam are compensated. Further, one of the aplanatic points of the aplanatic lens corresponds to the image of the masking plate.
REFERENCES:
patent: 3594071 (1971-07-01), Okajima
patent: 3914032 (1975-10-01), Takano et al.
patent: 3925793 (1975-12-01), Matsumura et al.
patent: 4102563 (1978-07-01), Matsumura et al.
Bovernick Rodney B.
Canon Kabushiki Kaisha
Corbin John K.
LandOfFree
Optical system for eye fundus inspection apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Optical system for eye fundus inspection apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical system for eye fundus inspection apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1178684