| 摘要 |
PURPOSE:To elevate the follow-up property of a device, and to make its response flat, by constituting the device so that an electric signal having a speed and acceleration corresponding to angle displacement of an arm is applied to a horizontal turning force generating part of the arm and a coil of a motor, and damping is applied. CONSTITUTION:On a shaft 5b of an arm 1, a permanent magnet 30a and a horizontal turning force generating part 30 consisting of a magnetic material 30b are provided, and also differentiating circuits 20, 22 and 23 for generating an electric signal having a speed and acceleration corresponding to angle displacement of the arm 1 are provided. In this constitution, an output corresponding to a turning speed of the arm 1 is supplied to the generating part 30 through a high-pass filter 25, and a damping operation is applied to horizontal turning of the arm 1. Also, outputs of the differentiating circuits 22, 23 are added by an adding circuit 24, are applied to a coil 9 of a linear motor, and damping is applied in the tracking direction of a base 6. In this way, a resonance level of a point fo lowers, the follow-up property of an arm of fo frequency or below is elevated, and accordingly, the response is made flat. |
