| 摘要 |
PURPOSE:To rotate a motor only for a required time to prevent the waste of a battery by controlling the stop of an instant film developing driving motor in accordance with the detection of reduction of a current flowed to the motor. CONSTITUTION:When a switch 34 is switched from a contact (a) to a contact (b) temporarily after the completion of exposure, a pulse signal is generated from a differentiating circuit 38 to set an FF 26, and an FET 40 is turned on, and a relay coil 42 is excited, and a switch 1 is switched to turn an instant film developing driving motor 3. When the current of the motor 3 becomes lower than the inversion level in the final stage of the developing processing, this reduction is detected, and the output of a comparator 18 is inverted to the high level, and the FF 26 is reset by the output pulse from the circuit 38, and the FET 40 is turned off, and the switch 1 is switched, and the motor 3 is stopped. Consequently, the instant film developing driving motor is turned only for a required time to prevent the waste of the battery, and further, the generation of unnecessary noise is prevented. |
