Exposure control system

Patent

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Details

354 60R, 354235, G03B 708, G03B 962

Patent

active

040018440

ABSTRACT:
A system for controlling the closing of a camera shutter includes photosensitive means for detecting the available light level in the field of view of the camera to provide an output control signal a predetermined time after initiation of shutter closure dependent on the detected available light level. The power supply for the system includes a bidirectional linear magnetic generator which includes a spring drive which is mechanically loaded and unloaded by the film advance mechanism of the camera to power the exposure control circuitry. A solenoid, such as a rotary solenoid or linear solenoid magnetically latches the shutter in the open position during exposure until the solenoid coil is energized at the completion of the required exposure time to neutralize the magnetic flux in the magnetic stator of the solenoid, overcoming the magnetic latch and, due to a spring, thereafter biasing the armature to a second position which, through the mechanical linkage of the camera, closes the shutter.

REFERENCES:
patent: 2999445 (1961-09-01), Fahlenberg
patent: 3472137 (1969-10-01), Galbraith, Jr.
patent: 3636840 (1972-01-01), Harvey et al.
patent: 3703132 (1972-11-01), Beach
patent: 3709118 (1973-01-01), Shoupp et al.
patent: 3774518 (1973-11-01), Vincent
patent: 3840297 (1974-10-01), Shoupp et al.

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