Camera exposure control devices with smoothing circuit

Details Camera exposure control devices with smoothing circuit Camera exposure control devices with smoothing circuit

1981-09-10

1983-07-12

Perkey, William B.

G03B 7085, G03B 7089

Patent

active

043927270

ABSTRACT:
A controlling device that determines the diaphragm aperture of the camera in accordance with an output of a light measuring circuit, which detects a light from an object to be photographed being illuminated by a light which includes an alternatingly changing component and has its intensity maintained constant in effect for a given time period. The device is equipped with a smoothing circuit for smoothing the ripple component in the photoelectric output. The smoothing circuit is set to have a charge time constant smaller than the discharge time constant and generates an output equivalent to the peak value of the ripple component. The light that illuminates the photographic object can be generated from the electronic flash and the photoelectric detector may be arranged within the body of a camera to receive the light from the photographic object that passes through the diaphragm aperture of the camera.

REFERENCES:
patent: 3520597 (1970-07-01), Fujii
patent: 4275335 (1981-06-01), Ishida
patent: 4288150 (1981-09-01), Ishida
patent: 4305647 (1981-12-01), Ishida

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