| 摘要 |
PURPOSE:To eliminate a danger of imparting an impact to a head by longitudinally dividing a yoke assembly forming a magntic circuit into two segments, isolating the permanent magnet of the facing poles, thereby smoothening the assembling work of a disc enclosure. CONSTITUTION:A movable coil 13 is arranged around a center yoke 12, a center yoke 10 is arranged outer periphery of the coil, the first and second permanent magnets 14, 9 are respectively faced at the poles at both longitudinal sides. Then, a front yoke 15 is provided in front of the first magnet 14 of front side, and the rear yoke 8 is provided behinG the second magnet 9 of rear side, thereby forming a magnetic circuit for driving the movable coil 13. Two segments divided from the center yoke 10 and the center yoke 12 are matched, thereby smoothening the assembling work of the disc enclosure. Thus, the impact to the head 5 can be eliminated. |
