Patent ID: 7493633

Claim:
A drive motor for a recording disk, in which a disk-shaped recording disk having a central hole is mounted on a rotor, for rotating about a rotational center axis of the rotor, the drive motor for a recording disk comprising: a rotor holder; a centering portion located around the rotational center axis on the rotor holder, wherein a radially outer peripheral surface of the centering portion makes a center of the recording disk be aligned with the rotational center axis of the rotor holder by contacting with an inner circumference of the central hole of the recording disk; a recording disk mount surface formed on the rotor holder at a radially outer peripheral area of the centering portion; a positioning portion disposed on the rotor holder; and a plurality of chucks located radially in the centering portion, wherein each chuck comprising: a wall portion extending radially outward; a projecting portion extending radially inward from the wall portion; a base portion extending radially inward, and axially downward, from the wall portion, the base portion having a lower surface; and an elastic portion located between the centering portion and the projecting portion, the elastic portion elastically biasing the chuck, wherein an inner end of the elastic portion is fixed to the centering portion and an outer end of the elastic portion is fixedly connected with the projecting portion to support the chuck in radially moveable manner, wherein a gap is formed between the lower surface of the base portion and the positioning portion such that the positioning portion contacts the lower surface when the disk-shaped recording disk is removed from the centering portion.