Electromagnetic trigger device

Details Electromagnetic trigger device Electromagnetic trigger device

1974-07-19

1976-03-23

Greiner, Robert P.

Optics: motion pictures

Removable film strip magazine type

354212, 352169, 242 715, G03B 118

Patent

active

039464105

ABSTRACT:
A capacitor-energized electromagnetic trigger device controls the energization of a camera motor which drives a film transport and shutter mechanism. For one-frame photography the motor is de-energized after a predetermined number of revolutions and then the transport and shutter mechanism is immobilized by a restraining device. For continuous photography the motor continues to operate and the restraining device is maintained ineffective. For repetitive one-frame photography, the capacitor is recharged after a one-frame cycle and the cycle is repeated. Embodiments are disclosed having different types of switching circuits, including different arrangements of transistor switches, SCR switches, mode selection switches, reset switches, and starting and holding coils.

REFERENCES:
patent: 3576362 (1971-04-01), Mayr et al.
patent: 3601481 (1971-08-01), Kessler
patent: 3721492 (1973-03-01), Kessler
patent: 3804499 (1974-04-01), Higuma

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