Automatic exposure control means

Details Automatic exposure control means Automatic exposure control means

1974-02-15

1977-01-25

Adams, Jr., Russell E.

Optics: motion pictures

Removable film strip magazine type

354 43, 354 60R, 354271, 352141, G03B 708

Patent

active

040054454

ABSTRACT:
A diaphragm of a camera is controlled by a servomotor which is actuated with an output of an amplifier. A bridge circuit including a photodetector which receives light from the object to be photographed is connected with the amplifier so that the imbalance output of the bridge circuit may be amplified by the amplifier and transmitted to the servomotor to actuate the motor in accordance with the imbalance of the bridge circuit. The output of the photodetector is differentiated by a differentiation circuit connected between the photodetector and the amplifier so that the output of the amplifier may be controlled by the differentiated output which represents the rate of variation in the quantity of light received by the photodetector.

REFERENCES:
patent: 3554633 (1971-01-01), Sekine
patent: 3587420 (1971-06-01), Dop
patent: 3611894 (1971-10-01), Minneste, Jr.
patent: 3696719 (1972-10-01), Tauikoski
patent: 3776111 (1973-12-01), Maido
patent: 3824605 (1974-07-01), Fliesser et al.,

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