| 摘要 |
PURPOSE:To fix cracks and chips with resin and to prevent fine magnets from attaching to a magnetic gap by injecting and forming resin between the inner diameter of a ring-like magenet and the central hole diameter of an upper plate and in a space enclosed by upper and lowr plate walls. CONSTITUTION:The upper plate 5 with a center hole for constituting the mag netic gap 7 is jointed on the upper surface of the ring-like magnet 4, and a lower plate 6 provided with a radial groove 10 is jointed on a surface contacting the lower surface of the ring-like magent 4 having a center pole 6a in the center. A periphery part is covered with the resin 8 and fixed. Simultaneously the resin 9 is injected and formed between the inner diameter of the ring-like mag net 4 and the centeral hole diameter of the upper plate 5 through the groove 10 provided on the lower plate 6. Thus such trouble can be prevented that the crack and chip of the magnet, which occur on the inner diameter side of the ring-like magnet, shift and attach to the magnetic gap.
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