Indicating devices for camera viewfinders

Details Indicating devices for camera viewfinders Indicating devices for camera viewfinders

1977-11-16

1980-08-12

Hix, L. T.

354 60L, 354224, 354289, G03B 1720

Patent

active

042170443

ABSTRACT:
An indicating device for a camera, which includes a viewfinder and which is selectively settable to either an automatic diaphragm control mode or an automatic shutter speed control mode, enables selective observation of the f-number and the shutter speed scales in accordance with the selection of the exposure control modes. The f-number and shutter speed scales are provided on a common transparent scale plate which is interconnected with an exposure control mode selecting member by a scale shifting mechanism. The scale shifting mechanism shifts the scale plate to a first position wherein only the f-number scale is in the viewfinder optical path upon selection of the automatic diaphragm control mode, and to a second position wherein both the f-number scale and the shutter speed scale are in the viewfinder optical path. A scale shielding member is provided within the viewfinder optical path to shield the f-number scale when the scale plate is in the second position.

REFERENCES:
patent: 3829867 (1974-08-01), Ono
patent: 3836922 (1974-09-01), Hasegawa et al.
patent: 3982254 (1976-09-01), Ito et al.
patent: 3990799 (1976-11-01), Nanba et al.
patent: 4047189 (1977-09-01), Bletz et al.

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