Patent ID: 7877764

Claim:
A chucking mechanism supporting a data storage disk having a center opening in a detachable manner, comprising: a turn table rotatable about a center axis, the turn table includes, a first cylindrical portion axially extending, a first discoid portion radially outwardly extending from the first cylindrical portion, a second cylindrical portion axially downwardly extending from a radially outside end of the first discoid portion, and a second discoid portion radially outwardly extending from the second cylindrical portion, on which the data storage disk is arranged; and a chucking member centered on the center axis and arranged on the turn table, the chucking member includes, a main body having an inner circumferential surface defining a center bore in which the first cylindrical portion of the turn table is fitted, an outer circumferential surface which is to radially face a radially inner surface of the data storage disk defining the center opening, and a radially inner wall arranged radially between the inner circumferential surface and the outer circumferential surface, a plurality of chucking claws supported in the main body in a radially movable manner, having radial tip ends arranged radially outside of the outer circumferential surface of the main body, a plurality of elastic members arranged radially between the radially inner wall of the main body and the plurality of chucking claws, and applying bias force radially outwardly pressing the chucking claws, wherein each of the elastic members comes in contact with at least one of the radially inner wall and the second cylindrical portion, and the radially inner wall and the second cylindrical portion are arranged at positions close or substantially the same to each other in the radial direction.