Magnification change-over device for camera

Photography – Having variable focal length of camera objective – Having focus operation

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396 83, 396 84, 396 90, 359432, 359698, 359700, 359701, G03B 500, G03B 1336, G02B 709

Patent

active

057520950

ABSTRACT:
A magnification change-over device is arranged to be highly suitable for a camera of the kind having a photo-taking lens and a viewfinder arranged independently of each other. The device includes the photo-taking lens having an image magnification which is variable; the viewfinder which is arranged to have an image magnification thereof also variable; an operating device for varying the image magnification of the viewfinder; a detecting device for detecting the magnifying state of the viewfinder; and a driving apparatus for driving the photo-taking lens according to a detection signal of the detecting device when a shutter release operation is performed. After a magnification setting operation is performed on the viewfinder, the change-over device changes the magnification of the photo-taking lens according to the magnification of the viewfinder when a photographing operation is actually performed.

REFERENCES:
patent: 3972056 (1976-07-01), Tsujimoto et al.
patent: 4083057 (1978-04-01), Quinn
patent: 4179191 (1979-12-01), Freudenschuss et al.
patent: 4314748 (1982-02-01), Kawabata et al.
patent: 4597657 (1986-07-01), Wakabayashi
patent: 5005038 (1991-04-01), Ogawa et al.

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