| 摘要 |
<p>A magnetic circuit contains a magnet, a first plate, a yoke and a magnetic gap. The first plate and the yoke are joined to the magnet. The magnet comprises a first magnet section and a second magnet section. The second magnet section has a lower magnetic characteristic than the first magnet section. Said first magnet section is placed near the magnetic gap. The second magnet section is placed at a position farther from the magnetic gap than the first magnet section. The first magnet section and the second magnet section are connected in parallel. By means of the aforementioned structure, the contribution of the second magnet section to the magnetic flux density of the magnetic gap is small. Accordingly, the second magnet section is capable of using of a low-cost magnet, with the magnetic characteristic of the second magnet section being acceptable even if low.</p> |
