Motion picture camera with film marking means

Details Motion picture camera with film marking means Motion picture camera with film marking means

1981-04-09

1982-07-13

Hayes, Monroe H.

Optics: motion pictures

With film carried control signals

352169, 352174, G03B 2150

Patent

active

043391800

ABSTRACT:
A motion picture camera has a rotary shutter driven by a DC motor which is supplied from a battery. The camera also has an arrangement for making light markings for identification purposes on the film in the camera. This arrangement includes a light-emitting diode and a capacitor which is charged by the battery and discharges across the diode. The electrical circuitry is such that the capacitor is connected to the battery only when the motor is disconnected therefrom; inversely, when the motor is to be connected to the battery in order to operate the shutter (and also to advance the film), the capacitor is first disconnected from the battery before the motor is connected to it and then discharges across the diode. The circuit also suppresses afterglowing of the diode.

REFERENCES:
patent: 3278251 (1966-10-01), Freudenschuss
patent: 3301628 (1967-01-01), Hellmund
patent: 3958872 (1976-05-01), Roth
patent: 4194817 (1980-03-01), Staudacher

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