Motion picture camera with motor control circuit having decrease

Details Motion picture camera with motor control circuit having decrease Motion picture camera with motor control circuit having decrease

1975-08-22

1977-02-08

Hayes, Monroe H.

Optics: motion pictures

Camera and/or projector drive mechanisms

With starting and/or stopping means

352169, G03B 100

Patent

active

040069788

ABSTRACT:
A pair of contacts of a relay energizes the driving circuit for the film drive motor when closed. The coil operating the contacts is connected in series with the emitter of a transistor whose base is connected to the battery upon closing of the camera activating button. Zener diode connected between the base of the transistor and the relay contacts. Closing of the contacts thus energizes the motor driving circuit and also connects the Zener diode into the base-emitter circuit of the transistor, thereby decreasing the base voltage and increasing the emitter-collector resistance so that current through the coil is decreased to the holding current.

REFERENCES:
patent: 3598480 (1971-08-01), Kubota
patent: 3790264 (1974-02-01), Heinrich

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