| 摘要 |
PURPOSE:To manufacture a molding orientating mold, which can be miniaturized and changed into multipoles and from which a resin magnet having excellent magnetic characteristics can be acquired, by alternately arranging magnetic pole sections consisting of a ferromagnetic substance and spacers composed of a good conductor on the outer circumference of a molding space in which the resin magnet is molded and orientated. CONSTITUTION:When single or plural pulse-shaped currents are caused to flow through a coil 5, the flow of magnetic flux in the direction of a molding space as shown in a solid line and the flow of magnetic flux in the transverse direction as shown in a broken line intend to be generated in a magnetic pole section. Since eddy currents are generated in a spacer 2 at that time and a magnetic field is generated by the eddy currents, however, the flow of magnetic flux in the transverse direction as shown in the broken line is offset, and all magnetic flux flow into the molding space. That is, the spacer 2 fills the role of the confinement of magnetism, and prevents flux leakage. Since flux leakage is not generated among the magnetic pole sections, the title mold can be applied to a mold for manufacturing a resin magnet, which has distances among the magnetic pole sections smaller than conventional devices and pole number more than the conventional devices and is further made smaller than the conventional devices in size. |
