Electrical generator or motor structure – Dynamoelectric – Linear
Patent
1975-07-01
1976-09-14
Duggan, Donovan F.
Electrical generator or motor structure
Dynamoelectric
Linear
310 15, 310 30, 354235, H02K 3502
Patent
active
039809080
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: 3153735 (1964-10-01), Branagan et al.
patent: 3202886 (1965-08-01), Kramer
patent: 3736448 (1973-05-01), Hebel, Jr. et al.
patent: 3840297 (1974-10-01), Shoupp et al.
patent: 3859547 (1975-01-01), Massie
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