Real-image variable magnification viewfinder

Details Real-image variable magnification viewfinder Real-image variable magnification viewfinder

1996-12-27

1998-06-23

Nguyen, Thong

Optical: systems and elements

Compound lens system

Variable magnification

359422, 359431, 396379, G02B 2702, G03B 1310

Patent

active

057711194

ABSTRACT:
A real-image variable magnification viewfinder includes, from the object side, an objective lens group of an overall positive power, including a first lens unit of a positive refractive power, a second lens unit of a negative refractive power, a third lens unit of a positive refractive power, and a fourth lens unit of a positive refractive power. The objective lens group forms an actual image of an object. The viewfinder also includes a reverse lens group for reversing an image formed by the objective lens group, and an eyepiece lens group for observing an image reversed by the reverse lens group.

REFERENCES:
patent: 3250195 (1966-05-01), Mashauis
patent: 5168402 (1992-12-01), Mihara
patent: 5193030 (1993-03-01), Nozaki et al.
patent: 5448400 (1995-09-01), Kikuchi et al.

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