Real time type viewfinder

Details Real time type viewfinder Real time type viewfinder

1994-07-12

1996-08-27

Nguyen, Thong

Optical: systems and elements

Compound lens system

Telescope

359431, 359646, G02B 2300, G02B 2500

Patent

active

055506747

ABSTRACT:
A real image type viewfinder is provided with, in the following order from the object side: an objective lens group, a condenser lens group which transmits the image of the object formed by the objective lens group towards an eyepiece lens group, an image erecting optical system that erects an inverted image, and, the eyepiece lens group. The eyepiece lens group consists of a negative lens and a positive double-convex lens, in this order from the eye side, and satisfies the following three relationships:

REFERENCES:
patent: 4265529 (1981-05-01), Yokota
patent: 5034763 (1991-07-01), Inabata
patent: 5136427 (1992-08-01), Sugawara
patent: 5191477 (1993-03-01), Abe et al.
patent: 5193030 (1993-03-01), Nozaki et al.
patent: 5235460 (1993-08-01), Abe
patent: 5255123 (1993-10-01), Estelle
patent: 5309286 (1994-05-01), Abe et al.

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