INFORMATION RECORDING MEDIUM

摘要

PURPOSE:To increase the attraction force by a magnet of the veneer type information recording medium of a magnetic clamping system to be used as an optical disk and to increase the binding force of a hub and a disk substrate. CONSTITUTION:The flange part 10 of the hub 6 having the flange part covering the part near a center hole 5 on the side of the disk substrate 2 made of a transparent resin opposite from its recording layer 3 is provided with a magnetic member 22 and a lining member 23 is mounted thereto so as to cover the center hole on the opposite side. The disk substrate 2 is fixed to the hub 6 and is held by the hub and the flange part 10.