Plural image camera having automatic exposure control

Details Plural image camera having automatic exposure control Plural image camera having automatic exposure control

1973-11-09

1976-04-20

Gonzales, John F.

Optics: motion pictures

Removable film strip magazine type

352 93, G03B 1724

Patent

active

039523195

ABSTRACT:
Automatic and rapid exposure control is incorporated in a camera having facilities for directing, along a common path, a pair of independent noncoincident light beams from an external object and from a separately illuminable item, such as a databearing transparency within the camera. A photoelectric circuit responsive to the total quantity of the directed light generates a proportional control voltage for operating an adjustable diaphragm to maintain a predetermined incident level of the directed light on the camera film and/or controlling the item illuminator or an auxiliary illuminator for the external object. Threshold controlled, motor-instrumented apparatus may be additionally provided to advance the film, to selectively operate a camera shutter, and to illuminate the item in response to trigger signals generated, e.g., upon the detection of the presence of the external object.

REFERENCES:
patent: 2998761 (1961-09-01), Cooper
patent: 3495267 (1970-02-01), Brodie

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