| 摘要 |
PURPOSE:To simplify the constitution of a displacement unit and also to prevent the generation of electric noises by adjusting the height position of a rotary head by transmitting driving force from a fixed part to a rotary part in the rotation center of a body of revolution. CONSTITUTION:Once a driving current is applied from driver circuit 10 to driving coil 9, a magnetic field applied to permanent magnet 8 concentric with body 1 of revolution varies to support movably coil 9 by supporting members 6 and 7 of body 1 connected to magnet 8 without touching, and through driving force transmission 5 combined with leaf spring 4 rotating together with revolution body 1, driving force generated by magnet 8 corresponding to the driving current is transmitted, thereby displacing spring 4. As a result, the driving force is transmitted from a fixed part to a rotation part in the rotation center and height positions of rotary heads 2 and 3 provided to spring 4 are adjusted by displacement. This displacement unit, therefore, requires no slip ring and its constitution is simplified, so that the generation of electric noises can be prevented. |
