Electromagnetic trigger device in motor-driven camera capable of

Details Electromagnetic trigger device in motor-driven camera capable of Electromagnetic trigger device in motor-driven camera capable of

1975-03-10

1976-09-14

Adams, Jr., Russell E.

Optics: motion pictures

Camera and/or projector drive mechanisms

With single frame operation

352121, 352137, 354173, G03B 2138

Patent

active

039804003

ABSTRACT:
This invention relates to an electromagnetic trigger device in a motor-driven camera for effecting bulb exposure in which the shutter is kept open during depression of the shutter release button. By depression of the shutter release button, discharge current from a first capacitor directly or indirectly energizes a electromagnet to drive a shutter driving mechanism. A latching lever stops the shutter driving mechanism in an open shutter position. By release of the button, discharge current from a second capacitor directly or indirectly energizes the electromagnet to drive the shutter driving mechanism. The latching lever stops the shutter driving mechanism in a closed shutter position, thus accomplishing the bulb exposure.

REFERENCES:
patent: 3705764 (1972-12-01), Reinsch
patent: 3722989 (1973-03-01), Inoue

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