Patent ID: 7555762

Claim:
A clamp mechanism for a disk-shaped recording medium, comprising: a turntable for rotating said disk-shaped recording medium; a clamper capable of being clamped onto said turntable; and a clamper holder having a projecting part for holding said clamper in rotatable fashion, wherein said clamper holder is attached to said clamper by inserting at least a portion of said projecting part into a space formed within said clamper, wherein said clamper has in its center a chamber portion that faces said turntable, and said turntable has a recessed portion engageable with said chamber portion, wherein said projecting part is provided at an end thereof with a flange having an outer diameter to be accommodated in said space, said chamber portion includes a cut-out portion formed by cutting out a portion of a sidewall thereof along a length just enough to allow said flange to pass through, and an engaging member is provided that has a function for holding said flange in said space after said flange has been inserted into said space in said chamber portion by passing through said cut-out portion.