Patent ID: 8976486
Filing Date: 2015-03-10
Classification: G11B

Abstract:
1. A rotating device comprising: a base; a hub that is rotatably supported by the base and on which a recording disk is to be mounted; a yoke that is fixedly provided on the hub and is configured to hold a magnet; a bearing unit in which one end thereof is fixedly provided on the base and in which the other end thereof is configured to hold the hub; and a coil that is fixedly provided on the base and is configured to generate electromagnetic interaction with the magnet, wherein the hub has a screw hole in which a screw for fixing a clamper, which is used to fix the recording disk to the hub, to the hub is screwed, wherein the screw hole penetrates the hub, wherein the yoke is configured such that the yoke covers one end of the screw hole, wherein a thickness reduction portion is provided around the hub on a side opposite in the axial direction to a surface on which the recording disk is to be mounted, and wherein an inner surface of the thickness reduction portion in the radial direction is located closer to the rotation center compared to a side surface of the hub onto which an inner circumference of the recording disk is fitted.