| 摘要 |
PURPOSE:To prevent a failure of photography due to a source voltage drop, by providing a means of detecting the source voltage drop and a film feeding means which stops operating in response to the output of the detecting means. CONSTITUTION:When the voltage obtained by dividing 2 and 3 the voltage of a power source 1 drops below a reference voltage 5, a comparator 4 generates an output to turn on a transistor (TR) 7 while turning off a TR8. Even if a switch SW1 changes over from a terminal NO to a terminal N C when a shutter release button returns to flow a charging current to a capacitor 17, TRs 8 and 10 are still off and a motor M does not rotate, inhibiting a film winding. When the source voltage is normal, the charging current of the capacitor 17 generated during the switching of the switch SW1 turns on the TR8 to take up a film and once the film is taken up by a specific length, a switch SW2 changes over from a terminal NO to a terminal NC to stop the motor M. |
