| 摘要 |
PURPOSE:To enhance the quality of an information recording disk by bonding two disk substrates, inserting a hub from the recording disk substrate having a larger diameter hole, and fixing it to the disk substrate having a smaller diameter hole. CONSTITUTION:A disk substrate 11 having a guide group 15 is bonded with a disk substrate 12 with adhesives 13. The internal diameter of the substrate 11 having a recording/reproducing layer is set larger than that of the substrate 12. After bonding the substrates 11 and 12, their center is obtained by sensing the guide group 15, and the bonding position of the hub 14 is determined. The hub 14 is fixed on the substrate 12 side with the adhesives, etc. In this method, since the hub 14 is fixed on the substrate 12, the substrate 11 is not mechanically or thermally effected due to fixing, and the high-quality information recording disk can be obtained. |
