Patent ID: 8032903
Filing Date: 2011-10-04
Classification: G11B

Abstract:
1. A motor comprising: a chucking device for detachably holding a disk having a central opening portion; a rotating body rotatable about a specified center axis, the rotating body including a rotor magnet and a rotor holder, the rotor holder having a cylindrical portion for holding the rotor magnet in place, a cover portion extending from the cylindrical portion to the center axis and a disk support portion formed on an upper surface of the cover portion for making contact with a lower surface of the disk; and a fixed body including a bearing member for rotatably supporting the rotating body and a stator arranged to face the rotor magnet, wherein the chucking device 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 and a cover portion for covering an axial upper side of the cylindrical portion of the center case, at least a part of the cylindrical portion of the center case arranged axially above the rotating body; resilient members received within the center case; and claw members for holding the disk in place, the claw members remaining in contact with radial outer ends of the respective resilient members, wherein each of the claw members has a tip end portion, a disk holding surface positioned axially below the tip end portion for holding the disk in place, and a recessed sliding portion formed substantially at a circumferential center region of the disk holding surface, the sliding portion serving to guide movement of the claw member, wherein rest portions are formed in the center case in a facing relationship with the respective sliding portions, the rest portions serving to support the respective sliding portions by contacting therewith, wherein the sliding portions are designed to make contact with the respective rest portions when the disk is mounted to the chucking device, wherein each of the sliding portions has a substantially planar slanting surface inclined radially inwardly and axially downwardly, and wherein each of the rest portions has an upwardly convex curved surface with which the corresponding sliding portion makes contact.