Automatic exposure control camera having a low brightness warnin

Details Automatic exposure control camera having a low brightness warnin Automatic exposure control camera having a low brightness warnin

1983-05-03

1985-04-09

Perkey, William B.

354475, G03B 7087, G03B 1718

Patent

active

045098476

ABSTRACT:
A camera in which light-sensing means is exposed to the light from an object to be photographed passed through stop means includes means for setting the aperture value of the stop means, means for driving the stop means in a direction in which the aperture value of the stop means is coincident with the aperture value by the setting means, prior to the exposure of the light-sensing means, metering means including a light-receiving element adapted to receive the light from the object passed through the stop means and produce an output corresponding to the intensity of the received light, the metering means producing a metering output corresponding to the brightness of the object on the basis of the output of the light-receiving element, means for controlling the exposure time of the light-sensing means in order that the light-sensing means may obtain a proper exposure, on the basis of the metering output after the stop means has been driven by the driving means, and discriminating means for discriminating, prior to the driving of the stop means, that the intensity of the light received by the light-receiving element after the termination of the driving of the stop means is lower than a predetermined value, on the basis of the metering output before the stop means is driven by the driving means, and putting out a discrimination signal.

REFERENCES:
patent: 4358188 (1982-11-01), Uchidoi

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