| 摘要 |
A disk-use hub of the present invention is provided with a hub's main body to which a magnetic plate is attached, an energy director for ultrasonically joining the disk, and a center hole to which a disk-driving-use spindle is inserted. The hub's main body, the energy director and the circumferential edge of the center hole are integrally molded into one part from a hard synthetic resin with which an abrasion-resistant resin in fine powder form such as, for example, fluororesin is blended. Thus, the friction resistance of the circumferential edge of the center hole is reduced, and abrasion of the center hole is also reduced even after repeated inserting and removing operations of the spindle into and from the center hole. Moreover, when, for example, poly-tetra-fluoroethylene, which is easily available at low costs, is used as the fluororesin, it becomes possible to provide an inexpensive disk-use hub, and also to reduce the friction resistance of the circumferential edge of the center hole effectively. <IMAGE> <IMAGE> <IMAGE> |
