Patent ID: 8296789

Claim:
A chucking device, comprising: a rotor holder including a upper cover portion extending radially with respect to a vertically-extending center axis and a cylinder portion extending downwards from the outer edge of the upper cover portion; a turntable positioned above the upper cover portion and arranged to directly or indirectly support a disk from below; an annular rolling guide portion including a top panel portion contiguous to the lower surface of the upper cover portion and an outer wall portion contiguous to the inner circumferential surface of the cylinder portion of the rotor holder; a closing member arranged to close the rolling guide portion from below; and a plurality of balls positioned within an annular space surrounded by the rolling guide portion and the closing member to make rolling movement in a circumferential direction, wherein the turntable and the rolling guide portion are formed of a single resin member extending continuously through a through-hole defined in the rotor holder.