Movie-camera with automatic fade-out shutoff

Details Movie-camera with automatic fade-out shutoff Movie-camera with automatic fade-out shutoff

1976-04-12

1978-06-13

Hayes, Monroe H.

Optics: motion pictures

Special effects

Transition effects

352141, G03B 2136

Patent

active

040945944

ABSTRACT:
A movie camera has a film advance motor which can only operate when a relay is closed that is controlled by a transistor. This transistor can be operated by the release switch of the camera and by a circuit which senses the end of a fade-out cycle so that the film-advance motor is automatically stopped at the end of the fade-out cycle. To this end a variable diaphragm, which is provided with automatic light-adjusting circuitry is operated by a driving coil adjacent which is provided a damping coil that causes a control circuit to change the level of an output signal when the diaphragm aperture is fully closed so that at this time the film-advance motor is automatically stopped.

REFERENCES:
patent: 3712721 (1973-01-01), Keiner
patent: 3792920 (1974-02-01), Mayr

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