Patent ID: 6594109
Filing Date: 2003-07-15
Classification: F16F,G11B

Abstract:
A disc clamp assembly for exerting a clamping force on a disc stack to secure the disc stack to a spindle hub to form a spindle hub assembly, and for modifying the center of gravity of the spindle hub assembly toward a central axis of rotation of the spindle hub, the disc clamp assembly comprising:a disc shaped base piece having a top surface and a bottom surface, the bottom surface for contacting a top surface of the spindle hub, a periphery on the base piece including a downwardly extending annular ring for contacting a top information storage disc of the disc stack; a disc shaped retainer piece engaged to the top surface of the base piece, the retainer piece having a peripheral balance ring receiving portion for receiving a balance ring; and a balance ring having a first end and a second end and an intervening gap therebetween, wherein the balance ring has a predetermined mass, the balance ring secured within the peripheral balance ring receiving portion of the retainer piece to modify the center of gravity of the spindle hub assembly toward the central axis of rotation of the spindle hub.