Patent ID: 6760188
Filing Date: 2004-07-06
Classification: G11B

Abstract:
A disc stack assembly, comprising:a spindle motor hub configured for rotation about a motor axis and having an annular ring recess; a disc disposed about the spindle motor hub; a substantially disc shaped clamp plate disposed about the spindle motor hub and having an inner ring engagement portion, an outer disc engagement portion, and an initial, substantially planar shape in an undeformed state; and an annular retaining ring secured within the annular ring recess and which maintains the clamp plate in a conically deformed state so that the inner ring engagement portion of the clamp plate applies a first moment force against the retaining ring while the outer disc engagement portion of the clamp plate applies a second moment force as an axially directed clamping force upon the disc as the clamp plate attempts to return to the undeformed state, wherein the clamp plate and the retaining ring are mutually configured so that the clamp plate does not contact the retaining ring as the clamp plate is transitioned from the undeformed state to the deformed state.