| 摘要 |
PURPOSE:To make winding of a film smooth to the final possible in low speed feed as well by feeding the voltage corresponding to the speed of a film driving motor back to the input side of a control circuit and feeding the voltage from a motor driven by the film movement back to the control circuit. CONSTITUTION:A resistance R31 for detecting generated voltage is connected in series to a short circuit switch S1-2, and the terminal voltage thereof is supplied via a resistance R32 to an operational amplifier OPA3, the output whereof is fed back via a resistance R34 to an operational amplifier OPA1. Namely, the generated voltage of a motor 14 generated at both ends of the resistance R31 is fed back to the OPA1 via the feedback system of the resistance R32, the OPA3 and the resistance R34, and the voltage of a motor 15 per se is fed back to the OPA1 by the feedback system of a resistance R3, a capacitor C1 and a resistance R4. Thereby, a film is wound smoothly at low speeds as well. |
