Viewfinder optical system and photographing apparatus having the

Details Viewfinder optical system and photographing apparatus having the Viewfinder optical system and photographing apparatus having the

1998-07-20

2000-04-18

Gray, David M.

Photography

With viewfinder

Lens detail

396384, 396386, G03B 1724

Patent

active

06052541&

ABSTRACT:
A viewfinder optical system includes, in order from an object side to an observation side, an objective optical system for forming a real image, a first optical member, the first optical member having a reflective surface by which to change a direction in which a light beam from the objective optical system advances, a second optical member, the real image being converted into an erecting image through the first optical member and the second optical member, and an eyepiece optical system for observing the erecting image, wherein the real image is formed on or near an exit surface of the first optical member, and the exit surface of the first optical member is a curved surface convex toward the observation side.

REFERENCES:
patent: 5095326 (1992-03-01), Nozaki et al.
patent: 5721979 (1998-02-01), Takato et al.
patent: 5757556 (1998-05-01), Nishimura
patent: 5798873 (1998-08-01), Hoshi et al.

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