| 摘要 |
PURPOSE: To enable support by a supporting body like a case using a clamping plate without using the plate, to facilitate production and to control cost. CONSTITUTION: The inner circumferential side of an optical disk is used as a clamping region 1a supported by a supporting body at the time of recording and/or reproducing information and a recess 3 is formed in a reference plane 1a1 as a face of the clamping region 1a brought into contact with the supporting body. The recess 3 is filled with a magnetic substance added resin 4. |
