Variable magnification viewfinder

Details Variable magnification viewfinder Variable magnification viewfinder

1996-09-30

1998-07-21

Nguyen, Thong

Optical: systems and elements

Lens

With variable magnification

359431, 359432, 359676, G02B 1514, G02B 2300

Patent

active

057842043

ABSTRACT:
A variable magnification viewfinder comprises, from the object side, an objective lens group of an overall positive power, including a first lens unit of a negative refractive power, a second lens unit of a positive refractive power, a third lens unit of a positive refractive power and a fourth lens unit of a positive refractive power, wherein the objective lens group forms an actual image of an object, a reverse group for reversing an image formed through the objective lens group, and an eyepiece lens group for observing an image reversed through the reverse group, and where 2.4<L/fw<3.7, wherein, fw represents the focal length of the objective lens group at a wide angle position, L represents the distance between a closest surface of the objective lens group to the object and the actual image of the object formed by the objective lens group.

REFERENCES:
patent: 5225927 (1993-07-01), Nozaki et al.
patent: 5231534 (1993-07-01), Kato
patent: 5247324 (1993-09-01), Estelle
patent: 5257129 (1993-10-01), Morooka et al.
patent: 5406416 (1995-04-01), Ohtake
patent: 5448400 (1995-09-01), Kikuchi et al.
patent: 5448411 (1995-09-01), Morouka
patent: 5587840 (1996-12-01), Itoh

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