Single lens reflex camera with light measuring device

Details Single lens reflex camera with light measuring device Single lens reflex camera with light measuring device

1984-09-07

1985-10-01

Perkey, William B.

354478, 354481, G03B 7099

Patent

active

045442568

ABSTRACT:
In the single lens reflex camera including a photographic system having an objective lens and an image detector, and a viewfinder optically disposed of the photographic system and comprising a focusing screen having a transparent area surrounded by a light diffusing area, a prism for changing the direction of an optical path, and an eye-piece in sequence from the object, a light receiving element for light measuring is positioned away from an optical axis of the viewfinder in rear of an image forming lens for converging the light from the focusing screen to the light receiving element, and is provided with a mask for blocking the main part of an image of the transparent area which is formed by the image forming lens, thereby the proportionality between the variation of F-number of the objective lens and the amount of light measured is improved.

REFERENCES:
patent: 3450016 (1969-06-01), Yamada
patent: 4309093 (1982-01-01), Kuwayama et al.

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