| 摘要 |
PURPOSE:To commonly use a voice coil and an auxiliary coil by alternately executing the drive operation of a driven unit according to the memory operation of speed information to memory means and stored content. CONSTITUTION:When a control signal SC is H, switches 22, 28 are connected to stationary terminals 222, 281. Accordingly, a counterelectromotive force proportional to the moving speed of a vibrating plate is presented at both ends of a coil 21, and an electric signal of a level in response to the difference between the moving speed of the plate and the target speed is charged in a capacitor 29. When the signal SC becomes L, the switches 22, 28 are connected to stationary terminals 221, 282, ad the voltage across the capacitor 29 is applied to the coil 21. As a result, the moving speed of the plate is controlled in response to the difference to the target speed. |
