Electromagnetic release device for a motion picture camera

Details Electromagnetic release device for a motion picture camera Electromagnetic release device for a motion picture camera

1974-01-10

1977-02-08

Hayes, Monroe H.

Optics: motion pictures

Camera and/or projector drive mechanisms

With starting and/or stopping means

352169, 352174, G03B 100

Patent

active

040069796

ABSTRACT:
An electromagnet release device for a motion picture camera having a drive motor, a shutter control member actuated by the driving force of the motor, a blocking mechanism to selectively block the actuation of the shutter control member, an electromagnet member to control the actuation of the blocking mechanism and a release control switching member with a delay circuit having a charging circuit that delays, for a predetermined time, the timing of the actuation of the motor relative to the timing of the actuation of the electromagnet and a discharging circuit to keep the motor energized for a period after the electromagnet is released to assure the driving of the shutter to the proper stop position. Circuits are also shown for reducing magnet current during continuous operation and for timing the operated period of the electromagnet in single frame operation.

REFERENCES:
patent: 3601481 (1971-08-01), Kessler
patent: 3602584 (1971-08-01), Anderl
patent: 3603678 (1971-09-01), Anderl
patent: 3790264 (1974-02-01), Heinrich

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