| 摘要 |
PURPOSE:To achieve the reduction of power consumption and the improvement of typing speed, by a method wherein the magnetic flux density of permanent magnet and at the same time the leakage of magnetic flux between neighboring cores by fixing plural pieces of cores to the permanent magnet spreading their gaps and by lessening the section of core in the direction being apart from the magnet. CONSTITUTION:Because respective cores 25 are arranged spreading the gap S and the width becomes narrower as they are becoming apart from the permanent magnet 22, the gap between neighboring cores 25 is broad. Therefore, the leakage of magnetic flux between cores 25 can be vanished. Because the permanent magnet 22 is in contact with the core 25 with the surface opposed to an armature 23, the length of magnetic path from the permanent magnet 22 to the armature 23 is short and the leakage of magnetic flux due to the optical flow of magnetic flux can be prevented. Therefore, the increase of power consumption due to magnetic interference can be prevented and the typing speed can be raised. Further, though the cores 25 spread the gap to prevent magnetic interference, the contacting surface to the core supporting surface 24 is large and the armature 23 can be quickly sucked with strong sucking force by raising the magnetic flux of permanent magnet 22, too. |
