Patent ID: 6369981
Filing Date: 2002-04-09
Classification: F16C,G11B,H02K

Abstract:
A disk drive unit comprising:a rotary member having a spindle; an information-recording disk being fixedly mounted on said rotary member; a bearing unit rotatably supporting said spindle, the bearing unit including: a radial bearing device provided in opposed relation to an outer peripheral surface of said spindle, the radial bearing device having a concentric arc-shaped bearing surface that is concentric with said circular outer periphery of said spindle, and a non-concentric arc-shaped bearing surface that is non-concentric with said circular outer periphery of said spindle; and a thrust bearing device provided in opposed relation to a distal end surface of said spindle; a motor for imparting a rotational force to said spindle; and a lubricating fluid filled in said bearing unit; wherein said radial bearing device comprises a plurality of radial bearings arranged in a direction of an axis of said spindle; one of said plurality of radial bearings has only said concentric arc-shaped bearing surface; and another of said plurality of radial bearings has a plurality of said non-concentric arc-shaped bearing surfaces.