| 摘要 |
PURPOSE:To eliminate the occurrence of an eccentricity caused by fitting and to obtain a small and thin optical disk with high precision by bonding and assembling a hub disk and a disk mainbody by bringing the prescribed tapered surfaces into close contact. CONSTITUTION:Two single-side optical disks 52 are adhered through a spacer 53 to form a both-face optical disk 54. In the one-sided optical disk 52 the hub disk 58 is fitted to the disk mainbody 51. At the time of assembling, the tapered recessed surface 62 of the disk mainbody 51 is abutted on the tapered projecting surface 75 of the hub disk. By holding a peel surface 61 had the upper surfaces of the hub disk 58 in a parallel state, they are pressed and bonded. Consequently, there is gap of fitting at the time of assembling, whereby the occurrence of eccentricity can be prevented, and the small and thin optical disk with high precision can be formed. |
