Patent ID: 7796357
Filing Date: 2010-09-14
Classification: G11B,H02K

Abstract:
1. An information recording and playback apparatus comprising: a rotating body rotatably holding a magnetic disk and being provided with a permanent magnet on an outer peripheral surface of the rotating body; a stator core fixed to a base member, the stator core protruding to the inner side in the radial direction in such a manner as to oppose the permanent magnet, the stator core including a plurality of stator poles around which winding wires are wound; a shield member disposed between the magnetic disk and the stator core in such a manner as to cover the stator core while leaving a small gap between the shield member and the rotating body, the shield member blocking magnetic flux from the permanent magnet and the stator core; and a magnetic head for carrying out recording and playback of the magnetic disk by moving forward and backward between the shield member and the magnetic disk, wherein the magnetic head moves forward and backward within a width W of a teeth section which is provided at a tip of one of the stator poles, the teeth section extending in the circumferential direction.