Patent ID: 6414817
Filing Date: 2002-07-02
Classification: G11B

Abstract:
A disc drive comprising:a spindle motor hub rotatable about a central axis and having a circumferentially extending outer hub surface; a disc circumferentially extending about the outer hub surface and having top and bottom disc surfaces each extending along planes substantially normal to the central axis; and opposing first and second disc support members circumferentially extending about the outer hub surface which cooperate to apply a clamping force to the disc to secure the disc relative to the spindle motor hub, the first and second disc support members each comprising a radially extending support member surface immediately adjacent the disc along a plane substantially normal to the central axis, a radially extending node which is formed from the same material as and which axially extends from the radially extending support member surface toward the disc, and a circumferentially extending ring having a contact surface that axially extends from the radially extending support member surface toward the disc, each ring having a coefficient of friction greater than a coefficient of friction of the node, wherein the clamping force applied to the top and bottom disc surfaces is localized at the contact surfaces of the rings and at the nodes so that respective gaps are formed between the top and bottom disc surfaces and the radially extending support member surfaces, wherein each disc support member comprises a circumferentially extending recess adjacent the respective radially extending support member surface, and wherein each ring is disposed within and extends from the respective recess.