Patent ID: 7667362
Filing Date: 2010-02-23
Classification: G11B

Abstract:
1. A disc drive apparatus mounted with an improved clamping mechanism for driving a disc to rotate, comprising: (a) a rotor, the rotor including: (1) a rotor yoke, (2) a clamping means for clamping down a disc on the rotor yoke, (3) a boss, the boss constituted by (4) a shaft fixed to the boss by being inserted into the through hole of the boss, wherein the rotor yoke is further constituted by a regulating surface for regulating a position in an axial direction of the disc clamped down on the rotor yoke by the clamping means and a center hole, and wherein the boss fastens the rotor yoke by engaging the center hole of the rotor yoke with an outer circumferential surface of the outer peripheral wall section of the boss at the bottom of the outer peripheral wall section of the boss; and (b) a stator supporting the rotor rotatable freely, the stator including (1) a bearing in a cylindrical shape supporting the shaft in a radial direction, (2) a bearing holder holding the bearing at a position crossing a plane including the regulating surface of the rotor yoke, and (3) a motor base fixed with the bearing holder, wherein a space is formed between an inner circumferential surface of the outer peripheral wall section of the boss and an outer circumferential surface of the shaft, and wherein a ring protruded section of the bearing holder is disposed so as to intrude into the space.