Optical: systems and elements – Compound lens system – Microscope
Patent
1996-11-12
1998-02-10
Nelms, David C.
Optical: systems and elements
Compound lens system
Microscope
359432, 359676, 359708, 359643, 359656, G02B 2100, G02B 2300, G02B 1514
Patent
active
057175217
ABSTRACT:
A super wide-angle variable magnification viewfinder includes an objective lens group of a positive refractive power. The objective lens group further includes a fixed first lens unit of a negative refractive power, a movable second lens unit of a negative refractive power for compensating the change of a view angle, a movable third lens unit of a positive refractive power for changing the magnification of the optical system, and a fixed fourth lens unit of a positive refractive power. Also included in the finder is a prism for erecting an image and an eyepiece lens group of a positive refractive power. The objective lens group forms an actual image of an object, and the actual image can be observed through the eyepiece lens group. The view finder satisfies the condition:
REFERENCES:
patent: 4842395 (1989-06-01), Sato et al.
patent: 5086353 (1992-02-01), Mukai et al.
patent: 5555431 (1996-09-01), Kim
Lester Evelyn A.
Nelms David C.
Samsung Aerospace Industries Ltd.
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