Patent ID: 8837078
Filing Date: 2014-09-16
Classification: G11B,Y10T

Abstract:
1. A rotating body for a fluid dynamic bearing used for rotating a recording disk that has been mounted therein, comprising: a rotating shaft portion, in which a cylindrical portion is integrally formed with a protruding portion, which extends radially outward from one end of the cylindrical portion, a diameter of an outer circumference of the protruding portion being larger than a diameter of an outer circumference of the cylindrical portion, the cylindrical portion is housed inside a sleeve, and the outer circumference of the cylindrical portion forms a radial dynamic bearing together with an inner circumference of the sleeve; and a hub that is connected with the outer circumference of the protruding portion and that has a mounting seat portion on which the recording disk is to be mounted, wherein the diameter of the outer circumference of the protruding portion is one and half times or more larger than that of the cylindrical portion.