US Patent 7380256 Disk device

A disk drive comprising a turntable 10 which has a ring-like disk receiving surface 11 on which a disk 40 is placed, a disk holding mechanism 20 which holds the disk 40 on the turntable 10, a disk-retaining abutment member 30 which has projections 34 and 35 provided at an outer periphery of the hole 31 and projecting toward the turntable 10, and a moving mechanism which allows the disk-retaining abutment member 30 and the turntable 10 to relatively approach each other and separate from each other, wherein the projections 34 and 35 are formed by a first deformed portion formed at a position opposed to the disk receiving surface 11 and a second deformed portion formed at a location closer to an inner peripheral side than the disk receiving surface 11, the projection 34 or 35 formed by the second deformed portion most projects toward the turntable 10.