| 摘要 |
PURPOSE:To secure the reliability extending over a long period without generating a harmful effect caused by a hub by constituting an optical disk of automatic centripetal structure parts without fixing the hub to the optical disk. CONSTITUTION:Both of a substrate and a hub are not fixed but are in a state that they can move freely in a space generated by sticking the substrate. Therefore, a harmful effect caused by fixation is not generated. When this optical disk is placed on a recording/reproducing device, the hub which is not subjected to constraint at all before it is placed is constrained by a rotary shaft fitted into the center hole, and also, constrained by a magnet provided on a turntable. Binding force by the magnet is transmitted to the center hole of the substrate through a tapered collar, and becomes binding force of the substrate and the turntable. At the time of transferring this binding force, a centriperal action is generated automatically between a guide group and the hub, and the centripetal action of the rotary shaft of the turnable and the guide group is executed. |
