Zoom viewfinder system for single reflex camera

Details Zoom viewfinder system for single reflex camera Zoom viewfinder system for single reflex camera

1995-04-04

1996-12-17

Nguyen, Thong

Optical: systems and elements

Compound lens system

Telescope

359422, 359434, 396377, 396386, G02B 2300, G02B 1310

Patent

active

055859658

ABSTRACT:
A zoom viewfinder system for a single reflex camera comprises a relay optical system through which said first object image is formed as a second object image and plural reflecting members for reflecting light rays of said first object image, wherein the reflecting members except one reflecting member provided closest to a first object image is moved in order to adjust an angle of light rays of the first object image to the reflecting members. The zoom viewfinder system also comprises a holder for holding the reflecting members located parallel in the relay optical system in order to determine relative positions of the reflecting members precisely. The zoom viewfinder system further comprises holding members for holding plural parts of an optical system respectively, wherein each part is fixed to compose a viewfinder system, so that assembly and maintenance can be easy and the optical axis can be prevented from deviating.

REFERENCES:
patent: 3975750 (1976-08-01), Yoshino et al.
patent: 4119982 (1978-10-01), Imura et al.
patent: 4432626 (1984-02-01), Ohtake
patent: 4910545 (1990-03-01), Fujibayashi
patent: 4955715 (1990-10-01), Kitagishi

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