Camera film drive motor control devices

Details Camera film drive motor control devices Camera film drive motor control devices

1982-04-14

1984-06-19

Gellner, Michael L.

G03B 112

Patent

active

044550731

ABSTRACT:
A film wind-up and rewinding motor is connected in series with a resistor so that a voltage commensurate with the motor current appears across the resistor. A level shift circuit shifts the voltage by a given level to generate a voltage signal for switching operation of a transistor. A voltage detecting circuit having a transistor or a bipolar transistor type voltage comparator detects the level of the voltage signal and generates a signal to energize an electromagnet for opening a power switch of the motor when the motor current varies due to forced rotational stopping of the motor or decreased load rotation of the motor causing the voltage signal to rise or drop to a given level.

REFERENCES:
patent: 3946409 (1976-03-01), Toyada
patent: 4122471 (1978-10-01), Takahata

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