| 摘要 |
<p>A hub (67) for an optical recording medium (61) comprises a metal member (67a) to be attracted by a clamping magnet (95) on a turn-table of an optical disk drive device (91), and a resin member (67b) having a center hole (77) for receiving a spindle (93) of the drive device (91). An inner peripheral portion (S8) and hole peripheral portion (S9, S18) of the center hole (77) are made of a resin as a whole. The section (72a) of the insertion portion of the center hole (77) of the hub (67) is expanded either linearly or in an arcuate form of a small radius towards the open end so as to prevent wear and deformation of the center hole (77) when the hub is attached to or removed from the drive device (91).</p> |
