Title: Exposure control system

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.

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Inventors: McClintock, Richard D. (Woodbury, CT, US)

Application Number: 592112
Filing Date: 1975-07-01
Publication_date: 1976-09-14
Assignee:
Primary Class(es): 396/465 264/101, 310/15, 310/30, 396/468
Other Classes:
US Patent Ref:

3153735	Oct, 1964	Branagan et al.	310/15.
3202886	Aug, 1965	Kramer	310/14.
3736448	May, 1973	Hebe, Jr. et al.	310/15.
3840297	Oct, 1974	Shoupp et al.	310/14.
3859547	Jan, 1975	Massie	310/14.

Other Refs:
Primary Examiner: Duggan, Donovan F.
Assistant Examiner:
Attorney: Hubbell, Cohen, Stiefel & Gross