Patent ID: 7228554
Filing Date: 2007-06-05
Classification: G11B

Abstract:
1. A driving unit for executing recording/reproducing to a recording disk, comprising in a disk holding portion for holding the recording disk: a first centering member having a predetermined outer diameter; a second centering member having an outer diameter smaller than that of the first centering member; and a protrusion size changing mechanism for changing a protrusion size of the second centering member toward the recording disk with respect to the first centering member, wherein when the recording disk held by the disk holding portion has a center hole of a predetermined diameter formed in the center portion of the recording disk, and a centering hole formed in the hub fixed to the recording disk, the centering hole having a diameter smaller than that of the center hole, the disk holding portion centers the recording disk by coupling the second centering member into the centering hole, wherein: