Zoom type of finder optical arrangement

Details Zoom type of finder optical arrangement Zoom type of finder optical arrangement

1993-07-02

1995-09-05

Ben, Loha

Optical: systems and elements

Lens

With variable magnification

359432, 354222, 354225, 354 94, G02B 1514, G03B 1308

Patent

active

054484111

ABSTRACT:
The invention is directed to a zoom type of finder optical arrangement which, even when the magnification of finder is increased by changing the focal length of the eyepiece system, is less likely or unlikely to undergo aberration fluctuations and kept stationary in respect of the eye point location, and comprises an objective lens system a of positive refracting power, reflecting members b and d for image erection, and an eyepiece system of positive refracting power, said eyepiece system comprising a lens unit f of positive refracting power and a lens unit g of negative refracting power, and moved along the optical axis in such a way that the air separation between both the lens units becomes wider, thereby altering the focal length of said eyepiece system to change the magnification of finder.

REFERENCES:
patent: 4639111 (1987-01-01), Harvey
patent: 4909614 (1990-03-01), Itoh et al.
patent: 4972216 (1990-11-01), Ueda et al.
patent: 5255030 (1993-10-01), Mukai et al.
patent: 5257055 (1993-10-01), Cho et al.
patent: 5309278 (1994-05-01), Ito et al.

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