Patent ID: 6775094
Filing Date: 2004-08-10
Classification: G11B

Abstract:
A disk supporting apparatus comprising:a motor including a rotatable hub having a disk receiving portion at an outer periphery of an end of the hub; a plurality of disks each of which has an inner hole through which the hub is inserted, the disks being fitted around an outer periphery of the hub; a spacer ring having an inner hole through which the hub is inserted, the spacer ring being fitted around the outer periphery of the hub and being located between the disks; and a clamp member fixed to other end of the hub to clamp the disks and the spacer ring between the clamp member and the disk receiving portion; the disk receiving portion and the clamp member having a substantially equal outer diameter, the spacer ring having a larger outer diameter than those of the disk receiving portion and clamp member, and if the outer peripheral radius of the spacer ring is defined as rs, the outer peripheral radius of each of the disks is defined as rd, the inner peripheral radius of the disk is defined as rh, and the outer peripheral radius of the disk receiving portion and clamp member is defined as rc, the rs, rd, rh, rc having a relationship: (rcâˆ’rh)/rd<0.1rsâˆ’rh)/rd<0.15.