| 摘要 |
PURPOSE:To absorb the shock after positioning and obtain good positioning accuracy by supporting a magnet assembly rotatably around a rotation axis and restraining the rotation by buffers. CONSTITUTION:When current flows in a coil 4, and the coil 4, a coil frame 3B and an arm 3A rotate with a rotation shaft 5, an assembly 6 is vibrated slightly around the rotation shaft by reaction force applied to the magnet assembly 6. At this time, a plate 14 is vibrated. However, the vibration is damped by buffers 12 on both sides. Thus, vibration applied from the magnet assembly to the base 9 is restrained. On the other hand, direction of drag and reaction force (F, -F1) is restrained by the rotation shaft 5, these forces are cancelled inside the positioning device. Thus, vibration after positioning is reduced, and reproduction of record of information can be made stably. |
