| 摘要 |
PURPOSE:To increase the strength of adhesion to forces in all directions by mounting hubs having flange parts from the inner side of disk substrates thereby increasing the adhesion margin of the hubs and the disk substrates. CONSTITUTION:This information recording medium 1 is constituted by sticking two sheets of the disk substrates 2 with recording layers 3 on the inner side to each other via an adhesive layer 7a. The insertion parts 6a of the hubs 6 respectively consisting of press moldings of a magnetic metallic plate are inserted from the recording layer 3 side into a central hole 5. The hubs 6 are so mounted that the flange parts 6b cover the disk substrates 2 from the inner side. The large adhering margin of the hubs 6 and the disk substrates 2 is taken in this way even if the diameter and depth of the clamping area of a turn table are small. The strength of adhesion to the forces in all the directions is thus increased. |
