Abstract: An electromagnetic device includes a fixed iron core through which a first magnetic flux flows, a movable iron core that reciprocates to separate from the fixed iron core by a predetermined gap when a current applied to a coil, which generates the first magnetic flux, is stopped and move to the fixed iron core by an attractive force when the current is applied to the coil. The electromagnetic device also includes a permanent magnet that generates a second magnetic flux. The opposed surface of the fixed iron core and the opposed surface of the movable iron core may be opposed in a reciprocating direction of the movable iron core. The permanent magnet may be attached to the fixed iron core such that a magnetized surface of the permanent magnet is opposed and exposed to the opposed surface of the movable iron core.

Abstract: An electromagnetic device includes a coil, a fixed iron core, a movable iron core configured to reciprocate to separate from the fixed iron core by a predetermined gap when a current applied to the coil is stopped and move to the fixed iron core by an attractive force when the current is applied to the coil, and a permanent magnet. The permanent magnet is arranged so that the permanent magnet is opposed to the gap in a second direction perpendicular to a first direction and separated from the fixed iron core and the movable iron core with a space interposed therebetween. A direction of a second magnetic flux generated by the permanent magnet conforms to a direction of the first magnetic flux between opposed surfaces of the fixed iron core and the movable iron core.

Abstract: An electromagnetic device includes a coil, a fixed member, a movable member configured to reciprocate to separate from the fixed member by a predetermined gap when a current applied to the coil is stopped and move to the fixed member by an attractive force when the current is applied to the coil, and a permanent magnet. The permanent magnet is arranged at a position adjacent to the gap and separated from the fixed member and the movable member with a space interposed therebetween. A direction of a second magnetic flux generated by the permanent magnet conforms to a direction of a first magnetic flux generated between the respective opposed surfaces of the fixed member and the movable member when the current is applied to the coil.

Abstract: An electromagnetic device includes: a coil configured to generate a first magnetic flux; a fixed member, a movable member configured to reciprocate to separate from the fixed member by a predetermined gap when a current applied to the coil is stopped and move to the fixed member by an attractive force when the current is applied to the coil; and a permanent magnet configured to generate a second magnetic flux between the respective opposed surfaces of the fixed member and the movable member in the same direction as the first magnetic flux. The permanent magnet is attached to at least one of the fixed member and the movable member such that a magnetized surface of the permanent magnet is opposed and exposed to the opposed surface of the other one of the fixed member and the movable member.

Abstract: The clamping device of spindle motor is disclosed, wherein a case portion contacted by the other distal end of the arms is inclined due to depression of a distal end of the arms by the disk, such that the arms linearly moves into the case to allow the other distal end to further rotate upwards, whereby the disk can be easily inserted into the case regardless of size of the inner diameter of the disk.

Abstract: A hub for holding media during manufacturing processes, such as inspection, includes a flexible cap at an end that has a cylindrical profile for engaging with the central void in the media. The cap is expanded to retain the media, avoiding contact of the clamping mechanism with the face of the media, so that particulation is reduced and contact confined to the edges of the media's central void. An actuator draws end of the cap toward the clamp body to place the cap in a clamping state and moves the end of the cap away from the clamp body to unclamp a disc. Vacuum or pressure may be used to move the actuator to the clamping or released state by providing a piston within the hub and applying vacuum to one side of a diaphragm coupled to the piston or pressure to the other.

Abstract: A turn table of a spindle motor is provided, wherein an outer diameter of a vertical portion at the disk insertion unit facing an inner periphery of a small-diameter disk is smaller by 0.01% to 0.15% than the inner periphery of the small-diameter disk to enable a chucking of the small-diameter disk having an inner diameter of an inner periphery smaller than 15 mm.

Abstract: A clamping apparatus for being disposed in an optical disk drive and carrying a disk is provided. The clamping apparatus includes a base, a spindle assembly, a pawl and a buffer element. The spindle assembly is disposed on the base and rotating about an axis. The pawl is assembled to the spindle assembly. The disk is configured to be locked to the pawl, such that the spindle assembly drives the pawl and the disk to rotate about the axis. The buffer element is assembled to the spindle assembly, and the buffer element is located above the pawl. The buffer element interferes with the disk when the disk is separated from the pawl.

Abstract: A spindle motor is disclosed, characterized by: a rotation shaft rotated by a stator and a rotor; a turn table rotated by the rotation shaft and accommodated by an optical disk; and a center cone moved along an axial direction of the rotation shaft for being brought into contact with an inner periphery of the optical disk to align a rotation center of the optical disk with a rotation center of the rotation shaft, wherein the center cone contacting the inner periphery of the optical disk is formed with a rise prevention unit configured to reduce a contact area with the inner periphery of the optical disk and to tightly contact the optical disk to the turn table.

Abstract: A turntable for storage disk drive apparatuses includes a plate member made of a ferromagnetic material and a central resin member arranged at the center of the plate member and formed by injection-molding a resin. The central resin member includes a disk guide portion provided on an upper surface thereof to guide a central hole of a disk and a plurality of gate recess portions indented upwards from a lower surface of the central resin member. The gate recess portions include ceiling surfaces positioned higher than the plate member. The ceiling surfaces include a plurality of gate cut portions formed in an injection molding process.

Abstract: Disclosed herein is a disk chucking apparatus. The apparatus includes a central boss which is coupled to a rotating shaft of a motor, a guide which extends from the central boss outwards and is inserted into a center hole of a disk, and a chucking unit which extends from the central boss outwards. The chucking unit is elastically deformable inwards when pushed by the disk that is fitted over the guide. The chucking unit includes a lower horizontal part, a vertical part and an upper horizontal part. The lower horizontal part extends from the lower portion of the central boss outwards in the horizontal direction. The vertical part is bent from the outer end of the lower horizontal part upwards. The vertical part extends in a direction inclined outwards. The upper horizontal part extends from the upper end of the vertical part inwards in a horizontal direction.

Abstract: An apparatus for rotating disc is provided, the apparatus according to an exemplary embodiment is characterized in that an anti-slip torque that is applied to the upper face of the disc by using the clamp unit and the elastic member is stronger than a rotation torque that is generated by the turn table to inhibit slipping of the optical disc from the turn table.

Abstract: A turn table of a spindle motor in which a small-diameter disk can be freely attached and detached is disclosed, wherein the disk insertion unit includes an inclination portion guiding the inserted disk, and a vertical portion extensively formed from the inclination portion to the disk accommodation unit to allow an inner periphery of the disk to be brought into contact, and wherein the claw includes an inclination claw portion guiding the inserted disk and a vertical claw portion bent from the inclination claw portion to chuck the disk, and wherein an outer diameter of the vertical portion at the disk insertion unit is 14.94˜l4.96 mm and an outer diameter of the vertical claw portion at the claw is 15.17˜15.23 mm.

Abstract: There is provided a turntable for a motor, including: a rotor case equipped with a chucking mechanism mounting a disk; a disk holding base part formed on the rotor case to be protruded by denting and disposed to be spaced apart from each other in order to form an air passage communicating a space formed between the disk and the top surface of the rotor case with the outer side of the rotor case; and a disk holding friction part stacked on the disk holding base part and grounded to the bottom surface of the disk.

Abstract: The disk clamp apparatus and a spindle motor having the same according to the present invention has an industrial applicability in that a radial force of a claw on a disk is greater than a radial force of an arm to the disk to prevent the radial force of the arm applying to the disk from affecting the disk, whereby matched center of the clamp body with a center of the disk by the law is not affected by an arm, such that the center of the disk comes to have a relatively smaller deviation from the center and to thereby enhance the reliability of the product.

Abstract: A turntable for a storage disk drive apparatus includes a plate member made of a ferromagnetic material and a central resin member arranged at the center of the plate member and formed into a single member by injection-molding a resin. The plate member includes a peripheral plate portion and a central plate portion positioned higher than the peripheral plate portion. The central plate portion includes a plate center hole defined at the center of the plate member. The central resin member includes a resinous cylinder portion extending through the plate center hole and defining a resin central through-hole, a disk guide portion arranged to guide a disk center hole, and a resinous connector portion arranged above the central plate portion to interconnect the resinous cylinder portion and the disk guide portion.

Abstract: A spindle motor is disclosed, wherein a spindle motor includes a rotating shaft coupling to a rotor yoke for supporting an optical disc, a clamp case disposing on the rotor yoke and coupling to the rotating shaft; and a chucking member including a rim portion combined with the clamp case, a plurality of extension portion radically extruded from an edge portion of the rim portion, and chucking arm portions formed at each of the end portion of the extension portions to chuck an inner face of the optical disc.

Abstract: The present invention relates to a disc chucking apparatus having claws that horizontally move and provide elasticity to improve performance in centering and chucking a disc. The disc chucking apparatus includes: a centering base to which an inner circumferential surface of a disc is fixed; a plurality of chuck chips arranged at regular intervals along an outer circumferential surface of the centering base; and a plurality of elastic support parts disposed to be opposite to the chuck chips on the centering base, rotating horizontally when the disc is mounted, and pressing the inner circumferential surface of the disc in an outer diameter direction thereof.

Abstract: A disk holding device is for use with a disk having a center hole. A disk holding mechanism with coupling levers is movable between a holding position and a release position, for engagement with an edge of the center hole when in the holding position, and for coming away from the edge when in the release position. A solenoid shifts the disk holding mechanism, to hold the disk by setting the disk holding mechanism in the holding position, and to enable loading or unloading of the disk by setting the disk holding mechanism in the release position. A separating projection is opposed to the edge when inserted in the center hole, for receiving the edge while the disk holding mechanism moves to the release position, to ensure separation of the disk from the disk holding mechanism.

Abstract: A turntable for a storage disk drive apparatus includes a plate member made of a ferromagnetic material and a central resin member arranged at the center of the plate member and provided with an outer peripheral portion positioned above the plate member. The central resin member includes claws extending downwards from the outer peripheral portion and claw position holes overlapping with the claws in the direction parallel to the center axis of the central resin member. The claw position holes include inner surfaces spaced apart from an edge of the plate member. The inner surfaces are defined by the resin. The central resin member includes a resin layer extending in the direction perpendicular to the center axis. The resin layer exists between the portion of the edge of the plate member around the claw position holes and the claw position holes.

Abstract: Disclosed is a spindle motor including a rotor yoke coupled with a rotation axis and having an optical disk mounted thereon; a clamp case that is arranged on the rotor yoke, inserted into an inner side of the optical disk and has a receiving groove formed on the side thereof; and a chuck clip having one side fixed to the clamp case corresponding to the receiving groove and the other side that elastically supports the inner side of the optical disk, the other side being corresponding to the one side.

Abstract: A data storage medium support member is produced by resin molding. The data storage medium support member includes an accommodating portion, a guide portion, and a gate cut portion. The accommodating portion accommodates a magnetic member around a central axis. The guide portion has a guide surface for guiding an inner edge of a disc, and is arranged radially outward of the accommodating portion. The gate cut portion is formed on a rear surface of the guide portion. The data storage medium support member can be produced by the resin molding while securing space for accommodating the magnetic member and preventing an increase in the axial dimension of the data storage medium support member.

Abstract: A spindle motor is disclosed which is configured such a manner that a rotor is press-fitted into a portion of a rotor fastener corresponding to a radially thicker portion out of outer portions of the rotor fastener of a clamping device, and a portion of the rotor fastener corresponding to a relatively thinner radial portion is filled up with an adhesive to adhesively couple a case with the rotation shaft side. Consequently, even if the rotation shaft side is coupled with the case, the case is not damaged to therefore enhance the reliability of the product.

Abstract: A motor device includes: a rotor case rotated along with a shaft; a chuck housing mounted on a hub of the rotor case; a chuck member mounted on the chuck housing such that the chuck member is protruded from the interior to an outer side, to fix a disc; and a concave portion formed as a recess on the rotor case to form a gap with the chuck support in contact with the chuck member to thereby prevent a frictional contact between the rotor case and the chuck member.

Abstract: There is provided a disk chucking device including: a chucking mechanism body installed on a rotor case; a chuck chip movably installed on the chucking mechanism body and fixing a disk thereto; and a spring member installed such that both ends thereof are supported by the chucking mechanism body and the chuck chip, and including a permanent deformation suppressing part provided in a bent portion thereof in order to prevent permanent deformation of the bent portion when the disk is loaded and unloaded and having a smaller pitch than that of other portions.

Abstract: A disk chucking device is disclosed. In accordance with an embodiment of the present invention, the disk chucking device coupling a disk to a rotor of a motor such that the disk can be mounted and demounted can include a boss, which is coupled with the rotor, a first elastic body, which includes an inner circumference surrounding the boss and in which the first elastic body has elasticity in a radial direction from a center of the boss, a plurality of second elastic bodies, which are radially disposed from the first elastic body and in which the plurality of second elastic bodies are elastically supported by the first elastic body, and a plurality of chuck pins, which press the disk and in which each of the plurality of chuck pins is elastically supported by each of the plurality of second elastic bodies.

Abstract: An auto-balancing device, and a disc chucking device and a disc driving device equipped with the auto-balancing device are disclosed. The auto-balancing device may include: a housing, which is coupled with a rotating body, and on which a boss is formed; multiple balancing members, which are rotatably supported by the boss, and in at least one of which a hole is formed; and a guiding roller, which is inserted in the hole, and which guides a movement of the balancing member. The auto-balancing device can be utilized to reduce noise and vibration for a rotating body during acceleration and deceleration and during high-speed rotations.

Abstract: A disk chucking device is disclosed. In accordance with an embodiment of the present invention, the disk chucking device coupling a disk to a rotor of a motor can include: a housing, which accommodates a boss that is coupled to the rotor; a plurality of chuck pins, which is inserted into the housing such that the chuck pins are protruded to the outside of the housing; an elastic body, which elastically supports an adjacent pair of the chuck pins toward the outside of the housing; a supporting surface, which is formed on an outer circumference of the boss to support a center portion of the elastic body; a guide part, which faces the supporting surface to guide a movement of the elastic body; and a protruding part, which is protruded on a lower end of the guide part toward the boss to support a lower side of the center portion of the elastic body.

Abstract: A disk device includes a turntable which is rotationally driven and, for placing a disk thereon, a clamper for rotatably holding the disk between the turntable and the clamper, a loading mechanism for carrying the disk inserted to between the turntable and the clamper, a clamp arm which includes a clamper holder for rotatably holding the clamper by a claw fitted to the hook with a clearance and an arm unit disposed pivotably on a pivot shaft positioned apart from the clamper holder, the clamp arm moving the clamper between a disk pressing position and a retreat position, and a clamper restricting member including a resilient portion capable of contacting a part of the clamper on the side opposite to the side of the clamper moved to the retreat position and on a side apart from the pivot shaft of the arm unit.

Abstract: Provided is a spindle motor having a clamping device. The spindle motor includes a bearing housing disposed on a base, a rotation shall rotatably supported by a bearing in the bearing housing, a stator coupled to the bearing housing, a bush directly coupled to the rotation shaft exposed from an upper portion of the bearing housing, a rotor yoke directly coupled to the bush, a magnet fixed on an inner circumference of the rotor yoke, and a clamping device disposed on the rotor yoke. The clamping device includes a body, a stopper, a weight, and an elastic member. The stopper is coupled to the body. The weight is coupled to the stopper. The elastic member elastically supports the stopper.

Abstract: A disc drive device able to increase the number of plastic flexible cantilever beams and improve a centering holding function of a disc to enable handling of high speed revolution, that is, a disc drive device having a plastic turntable mounted on a shaft of a spindle motor, wherein this turntable has a disc hole engagement projection provided with a ring-shaped projection and a plurality of centering portions which extend from this ring-shaped projection outwardly in a diametrical direction and have guide surfaces from which an edge of a disc hole easily slides off, a disc carrying portion, through holes formed defined between adjoining centering portions, and flexible cantilever beams extending in the through holes.

Abstract: Provided is a clamping device of a spindle motor including a body, a stopper, a weight, and an elastic member. The stopper is coupled to the body. The weight is coupled to the stopper. The elastic member elastically supports the stopper. According to one embodiment, at least a portion of each stopper is coated with a material having a specific gravity higher than the specific gravity of the body. This material provides the weight coupled to the stopper.

Abstract: In a motor including a chucking device for detachably holding a disk, the chucking device has a center case to which a central opening of the disk is inserted; resilient members received within the center case; and claw members for holding the disk in place. 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. 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. Each of the rest portions has an upwardly convex curved surface with which the corresponding sliding portion makes contact.

Abstract: In a motor including a chucking device for detachably holding a disk, the chucking device has a center case to which a central opening of the disk is inserted. The center case has 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. 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.

Abstract: A turntable of a recording medium drive can include a coupler having an inner circumference to which a rotating shaft is fixed, and an outer circumference onto which a disk is inserted; a table extending outwardly from the outer circumference of the coupler and for mounting the disk thereon; and first and second claws elastically supporting the disk by making contact with a clamping region of the disk. In an embodiment, the distance from the center of the rotating shaft to an outer surface of the first claws making contact with the clamping region of the disk is longer than the distance from the center of the rotating shaft to an outer surface of the second claw making contact with the clamping region of the disk.

Abstract: A disk chucking apparatus and a disk drive having the same are disclosed. The disk chucking apparatus may include: a chuck base having a plurality of holding portions, a plurality of chuck pins which are inserted in the holding portions such that the chuck pins protrude out from the chuck base, and a plurality of elastic members which elastically support the chuck pins, where each of the elastic members elastically supports a pair of adjacent chuck pins concurrently. When this disk chucking apparatus is utilized, the center of the disk and the center of the chuck base can be aligned with greater ease, since forces can be transferred uniformly to the center of disk.

Abstract: This disk chucking apparatus may include: a chuck bass having a plurality of holding portions, a plurality of chuck pins which are inserted in the holding portions to be elastically supported, and protrudes out from the chuck base, an elastic fragment which is arranged to be symmetrical to the chuck pin with respect to the rotation center of the chuck base, and elastically supports a disk together with the chuck pin, and wherein the elastic fragment has an inclined surface inclined with respect to a direction of equipment of the disk, and the inclined surface are increased from smaller radius than the inner radius of the disk to larger radius than the inner radius of the disk. This disk chucking apparatus make it possible to align the centers of the chuck base and disk, and to decrease the force in mounting a disk.

Abstract: In a motor including a chucking device for detachably holding a disk, the chucking device has a center case to which a central opening of the disk is inserted; resilient members received within the center case; and claw members for holding the disk in place. Each of the claw members has a claw portion having a disk holding surface for holding the disk in place and a pair of wing portions extending radially inwardly from the claw portion. Further, each of the wing portions has a spherical contact surface contacting with a underlying part arranged axially below the wing portions.

Abstract: A disk chucking device and a disk driving device having the same are disclosed. The disk chucking device may include: a chuck base, on which a boss is formed; chuck chips inserted in the chuck base in a manner such that the chuck chips protrude out from the chuck base; an elastic member, which elastically supports a pair of adjacent chuck chips towards an outer side of the chuck base; and a protrusion portion, which is formed on a bottom of the boss, and which supports the elastic member. The disk chucking device can improve the environment of the elastic members that support the chuck chips, to improve the alignment between the rotation centers of the disk and the chuck base.

Abstract: A chucking device for removably holding a disk with a central opening, includes a shaft coaxially arranged with a specified center axis; a turntable fixed to the shaft, the turntable having a disk support surface for supporting the disk; and a resin-made cone arranged axially above the turntable, the cone including a shaft-fixed portion fixed to the shaft, a disk holding portion having an annular disk holding surface inclined radially outwardly and axially downwardly, and an arm portion for radially interconnecting the shaft-fixed portion and the disk holding portion. Herein, the arm portion includes a support portion extending radially outwardly from the shaft-fixed portion and an elastically deformable portion joined to the support portion for being elastically deformed to axially downwardly move the disk holding portion as the disk comes into contact with the disk holding portion.

Abstract: In a brushless motor for use in a disk drive, a rotor is mounted onto a tube portion of a housing. A retaining claw is formed at an upper end of the tube portion. A turntable has a central concave portion which accommodates an upper portion of the tube portion of the housing. A retaining member is provided radially outside the central concave portion, and includes a plurality of retaining pieces extending to the inside of the central concave portion. When the rotor is mounted onto the housing, the retaining pieces come into contact with the retaining claw and then move upward. When the rotor moves upward relative to the housing, the retaining pieces come into contact with the retaining claw, thereby restricting upward movement of the rotor. Upward movement of the retaining pieces is restricted by contact between the retaining member and the turntable.

Abstract: Disclosed herein is a disk chucking apparatus. The apparatus includes a central boss which is coupled to a rotating shaft of a motor, a guide which extends from the central boss outwards and is inserted into a center hole of a disk, and a chucking unit which extends from the central boss outwards. The chucking unit is elastically deformable inwards when pushed by the disk that is fitted over the guide. The chucking unit includes a lower horizontal part, a vertical part and an upper horizontal part. The lower horizontal part extends from the lower portion of the central boss outwards in the horizontal direction. The vertical part is bent from the outer end of the lower horizontal part upwards. The vertical part extends in a direction inclined outwards. The upper horizontal part extends from the upper end of the vertical part inwards in a horizontal direction.

Abstract: A data storage disc carrier (1) for carrying discs (10). The carrier includes an axial clamping mechanism which incorporates a three legged resilient clamping member (7) that can flees between release and clamping positions to allow easy loading a gripping of discs (10). The clamping member is articulatingly mounted on a tail (4) that is gripped to provide clamping.

Abstract: A chucking mechanism is operable to detachably set thereon a discoid disk. The chucking mechanism includes a center case, a claw member, an elastic member, and a turn table. The claw member includes, a claw portion, and a movement support portion The center case includes a movement pivot receiving portion. A support point extending continuously from the movement pivot portion is arranged radially inwardly of the movement pivot portion at the movement support portion, and axially upward movement of the tip portion is substantially prevented since the support point makes contact with the movement pivot receiving portion, and a top surface of the movement support portion makes contact with a bottom surface of the top plate portion.

Abstract: A claw member includes at a radially inward surface thereof a protrusion inclined surface in order to minimize deformation occurring in an axial direction to an elastic member which is a coil spring. The protrusion inclined surface is preferably inclined, when a tip portion of the claw member is at an axially lowest point, to be substantially perpendicular to the central axis, or such that the further radially inward a portion thereof is the axially lower the portion is. By virtue of such configuration, the protrusion inclined surface minimizes deformation occurring to the elastic member in the axial direction.

Abstract: A motor used for a data storage disk drive is provided. The motor includes a rotor holder having a cylindrical portion. The cylindrical portion has a radially inner surface defining a through hole and an inner protruding section arranged at an axial end portion of the radially inner surface. The inner protruding section radially inwardly protrudes from the radially inner surface into the through hole. A shaft of the motor is inserted into the through hole and fixed to the radially inner surface of the cylindrical portion of the rotor holder with an adhesive. In the motor, a radially inner end of the inner protruding section of the rotor holder radially opposes an axially upper portion of the shaft. In addition, the portion of the axially lower surface of the inner protruding section of the rotor holder axially opposes the shaft while the axially upper portion of the shaft and the inner protruding portion are arranged in an axially vicinity manner.

Abstract: A movement pivot receiving portion which receives a movement pivot portion of a claw member and a movement support receiving portion which receives a movement assist portion of the claw member are arranged radially within a cylindrical portion of a center case. By virtue of such configuration, both receiving portions are designed with a greater degree of freedom within a space between an inner circumferential surface of the cylindrical portion and an outer circumferential surface of a base portion. Therefore, the claw member may be designed to have a preferable thickness while achieving a preferable movement of in an axial direction.

Abstract: In a motor including a chucking device for detachably holding a disk, the chucking device has a center case to which a central opening of the disk is inserted; resilient members received within the center case; and claw members for holding the disk in place. 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. Rest portions are formed in the center case to face the respective sliding portions, the rest portions serving to support the respective sliding portions by contacting therewith. The sliding portions are designed to make contact with the respective rest portions when the disk is mounted to the chucking device.

Abstract: In a brushless motor for use in a disk drive, a rotor is mounted onto a tube portion of a housing. A retaining claw is formed at an upper end of the tube portion. A turntable has a central concave portion which accommodates an upper portion of the tube portion of the housing. A retaining member is provided radially outside the central concave portion, and includes a plurality of retaining pieces extending to the inside of the central concave portion. When the rotor is mounted onto the housing, the retaining pieces come into contact with the retaining claw and then move upward. When the rotor moves upward relative to the housing, the retaining pieces come into contact with the retaining claw, thereby restricting upward movement of the rotor. Upward movement of the retaining pieces is restricted by contact between the retaining member and the turntable.

Abstract: A claw member includes a claw portion and a movement support portion. The movement support portion includes a movement pivot portion which is a pivotal portion of the movement of the claw member, and a movement support portion formed radially inward of the movement pivot portion. The claw member is allowed to maintain an axial height of a tip portion thereof while smoothly maintaining a movement in a radially inward direction thereof since a movement support receiving portion and the movement support portion make contact with one another.