METHOD FOR ATTACHING MAGNETIC PLATE TO DISK SUBSTRATE

摘要

PURPOSE:To house and hold a magnetic plate on a disk substrate with a fixed clearance in a loosely fitted state. CONSTITUTION:In a state where the magnetic plate 5 is arranged in a magnetic plate housing recessed part 6 provided in the center of the disk substrate 2, a horn 17 which generates torsional vibration is allowed to abut on so as to form a projecting part 19 which projects toward the inner side of the recessed part 6 from the periphery of the recessed part 6.