| 摘要 |
PURPOSE:To precisely fit a hub to an optical recording medium independently of the track pitch at a low cost by forming a positioning pattern for fitting a hub on the optical recording medium with a mask for exposure having a positioning pattern for fitting a hub. CONSTITUTION:A positioning pattern 46 concentric with a guide layer pattern 45 is formed on an optical recording medium 52 with a mask for exposure having a positioning pattern for fitting a hub. A hub is fixed so that a positioning pattern 26 concentric with a central hole 28 coincides with the positioning pattern 46. |
