Patent ID: 6775097
Filing Date: 2004-08-10
Classification: G11B,Y10T

Abstract:
A rotational driving apparatus system comprising a user disk and a rotational driving apparatus for rotating the user disk, said rotational driving apparatus being separately supplied by a manufacturer, said user disk being separately supplied by a user and configured to be removably mounted on said rotational driving apparatus by said user, said rotational driving apparatus comprising:a turntable for magnetically attracting a hub disposed in the center of the user disk, the hub having a center hole and a driving hole formed therein; a center axis protruding at the rotational center of said turntable and configured to be inserted into the center hole of said hub; a driving pin supported by said turntable so as to be projectable therefrom and configured to be inserted into the driving hole of said hub; rotating members including said turntable; and motor driving means for rotationally driving said rotating members; wherein said rotational driving apparatus system further comprises a diskless dummy hub, said diskless dummy hub being separately supplied by the manufacturer of the rotational driving apparatus; and wherein said rotating members comprise a rotational balance that has been adjusted while said user disk is not mounted on said apparatus, said rotational balance being adjusted by imparting a weight to, or removing a portion of, said rotating members while the diskless dummy hub has been temporarily mounted on said turntable, by inserting the center axis of said turntable into a center hole of said diskless dummy hub, by inserting the driving pin into a driving hole of said diskless dummy hub, and by rotating the diskless dummy hub at a speed of rotation equal to a design speed of rotation of said user disk.