Device for reducing counter-light incident on a single-lens refl

Details Device for reducing counter-light incident on a single-lens refl Device for reducing counter-light incident on a single-lens refl

1981-09-09

1983-06-07

Gellner, Michael L.

354219, G03B 1302

Patent

active

043868355

ABSTRACT:
The device according to the present invention comprises a photosensitive element responsive to counter-light which enters into an optical view finder from its eyepiece, a detector responsive to the signal from the photosensitive element for producing a control signal when the intensity of the counter-light exceeds a predetermined value, and a shutter arranged to close in response to the control signal for preventing the counter-light from propagating through the optical system of the view finder to another optical system of a video camera, movie camera or the like. Thus, picture quality of the camera or the like is prevented from deteriorating due to the counter-light entering into the view finder. The shutter may be replaced with an aperture stop or a filter so that the shooter can see an objective image through the view finder, while the amount of counter-light transmitted to the optical system of the camera or the like can be reduced.

REFERENCES:
patent: 3890627 (1975-06-01), Uno

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