Patent ID: 6771460
Filing Date: 2004-08-03
Classification: F16C,G11B,H02K

Abstract:
A magnetic disc device comprising:a magnetic disc; a hub having an inside and an outer peripheral side on which the magnetic disc is mounted; a rotary shaft having an axial direction and coupled with the hub so as to be integrally rotated therewith; a motor arranged on the inside of the hub; the magnetic disc, the hub, the rotary shaft and a part of the motor constituting a rotary body; a radial bearing having a length in the axial direction of the rotary shaft, for supporting the rotary body in a direction crossing the rotary shaft; and a thrust bearing for supporting the rotary body in the axial direction of the rotary shaft; wherein the thrust bearing has an outer diameter greater than the length of the radial bearing, and the thrust bearing is arranged at a position which is inside of the motor and diametrically inward of the hub.