Automatic exposure control camera

Details Automatic exposure control camera Automatic exposure control camera

1981-09-11

1984-02-21

Adams, Russell E.

G03B 708

Patent

active

044326238

ABSTRACT:
Disclosed is a single lens reflex camera of the mean metering type having a first photodiode provided between a mirror and a film and a second photodiode provided in a finder system in which before the shutter release a shutter time is calculated on the basis of an output signal of the second photodiode and is displayed in the finder, and when the shutter release starts and the mirror rises and the shutter time is determined by an output signal from the first photodiode for receiving the reflected light from a front shutter curtain and the film. In the camera, a central portion of the mirror is translucent. A submirror is provided behind the translucent portion, which causes the first photodiode to receive the light from only the central portion of a frame before the shutter release. Further, the camera has a first operating circuit for obtaining a difference between the outputs from the first and second photodiodes before the shutter release and a second operating circuit for adding the result of the operation by the first operating circuit to the output from the first photodiode during the shutter release, whereby a partial metering for controlling a shutter time during the shutter release in accordance with the result of the operation by the second operating circuit is realized.

REFERENCES:
patent: 3864699 (1975-02-01), Tsunekawa et al.
patent: 4284341 (1981-08-01), Yamada
patent: 4322142 (1982-03-01), Kawamura et al.
patent: 4325617 (1982-04-01), Sahara et al.

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