Patent ID: 8032902

Claim:
A motor comprising: chucking device for detachably holding a disk having a central opening portion; a shaft centered on a center axis; a rotor magnet rotatable together with the shaft about the center axis; a bearing member for rotatably supporting the shaft; and a rotor holder having a cylindrical portion for holding the rotor magnet in place, a cover portion extending from the cylindrical portion radially inwardly and a shaft-fixed portion fixed onto the shaft, the cover portion of the rotor holder having at a center region thereof a cylindrical central protrusion portion for receiving a part of the bearing member, wherein the chucking device is arranged axially above the rotor holder and includes: a center case to which the central opening portion of the disk is inserted, the center case having a cylindrical portion coaxial with the center axis, a cover portion for covering an axial upper side of the cylindrical portion of the center case and a base portion fixed to the shaft-fixed portion of the rotor holder; resilient members received within the center case; and claw members remaining in contact with the respective resilient members, the claw members being movable radially to hold the disk in place, and wherein the center case is spaced apart from the rotor holder except for the base portion contacting with the shaft-fixed portion of the rotor holder.