Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1980-07-15
1983-01-25
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
043700349
ABSTRACT:
An ophthalmological instrument capable of continuously changing the size of an observed image is disclosed. The instrument comprises an image forming optical system for forming a first observed image, a magnification changing optical system for forming a second observed image from said first image and continuously changing the size of said second image and a correction member for correcting the optical length. To continuously change the size of said second image for observation, the magnification changing optical system includes a positive lens group and a negative lens group which are movable relative to each other in the direction of the optical axis. In order to keep constant the positions of the anterior and posterior focal points of the magnification changing optical system, that is, a composite system of the two lens groups, the optical length correction member is movable in association with the movements of the positive and negative lens groups.
REFERENCES:
patent: 3030857 (1962-04-01), Shumway
patent: 3217622 (1965-11-01), Kiyono
patent: 4265518 (1981-05-01), Matsumura
Bovernick Rodney B.
Corbin John K.
Nippon Kogaku K.K.
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