Abstract: Embodiments for passive retraction of a hub clamp in an optical disc drive. The optical disc drive may comprise a spindle hub coupled to an optical assembly. The optical disc drive may further include a disc clamp assembly configured to hold an optical disc on the spindle hub, the disc clamp assembly including a hub clamp partially comprised within a clamp carriage. The hub clamp of the optical disc drive may be biasedly drawn toward the spindle hub when in a first position and biasedly drawn toward the clamp carriage when in a second position. The bias may be generated by at least one ferromagnetic material integrated into the hub clamp and at least one ferromagnetic material integrated into the spindle hub.

Abstract: Provided is an optical disk drive including a turntable on which an optical disk is mounted and which rotates the optical disk, a chuck pulley movable in the direction of an axis of the turntable between a first pulley position spaced from the turntable and a second pulley position which is close to the turntable and in which the chuck pulley grips the optical disk together with the turntable, the chuck pulley being attracted toward the turntable by a magnetic force, and a pulley operating mechanism for moving the chuck pulley between the first pulley position and the second pulley position. The pulley operating mechanism, at the time of moving the chuck pulley between the first pulley position and the second pulley position, inclines the chuck pulley in relation to the turntable, and brings the chuck pulley closer to or away from the turntable.

Abstract: A turn table for a spindle motor and a spindle motor having the turn table are provided, the turn table for a spindle motor according to an exemplary embodiment comprising a clamping plate configured to have a locking protrusion protruding from an inner surface of a first recess thereof, the first recess being concavely formed in an outer circumference of the clamping plate; and a turn-table body configured to have a second recess to receive the clamping plate, and a plurality of protrusions protruding from an inner surface defined by the second recess towards the first recess to lock the locking protrusion.

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 disk drive apparatus able to prevent jamming of a disk and abutting parts having a rotary table fit on a shaft of a brushless motor and carrying a disk and a centering part elastically biased in an axial direction away from a center hole of this rotary table and fit in a center through hole of the disk to center and hold the disk, the centering part having inelastic abutting parts sticking out from a center taper part in radial directions and abutting against an inner circumferential edge of the center through hole and having outer circumferential groove parts forming clearances from the inner circumferential edge between the inelastic abutting parts adjoining each other in the circumferential direction.

Abstract: There is provided a disk clamping mechanism that supports a disk on a turntable unit under pressure by an attractive force produced between a clamping magnet and a damper constituted in a rotor unit, wherein the clamping magnet is directly fixed at the upper surface of a rotor frame including the turntable unit, and further, the upper surface of the clamping magnet is covered with a centering member for centering the disk.

Abstract: A cylindrical member is fixed to an upper portion of a rotary shaft and a clamper presses an optical disc in contact with the top of a turntable. The structure is such that a first bottom face of the cylindrical member that faces a clamping magnet in the axial direction is positioned below an opposite face of the clamper that faces the clamping magnet in the axial direction.

Abstract: Disclosed is a turn table for a spindle motor, the turn table including a clamping plate having a locking protrusion protruding from an inner surface of a first recess that is concavely formed in an outer circumference of the clamping plate, and a turn-table body having a second recess to receive the clamping plate and having protrusions that protrude from an inner surface defined by the second recess towards the first recess to lock an upper surface and a side surface of the locking protrusion.

Abstract: An apparatus for rotating a disc is disclosed, wherein the apparatus for rotating the disc includes a rotation shaft; a turn table coupled to the rotation shaft and having a felt that makes contact with a disc; a center guide member inserted into the rotation shaft and coupled to an inner face of the disc; a clamp magnet sucking a clamp unit that is faced with the turn table and makes contact with an upper face of the disc toward the felt; an elastic member interposed between the turn table and the center guide member and the elastic member elastically supporting the center guide member in an axial direction of the rotation shaft, wherein 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 prevent slipping of the optical disc from the turn table.

Abstract: A cylindrical member is fixed to an upper portion of a rotary shaft and a clamper presses an optical disc in contact with the top of a turntable. The structure is such that a first bottom face of the cylindrical member that faces a clamping magnet in the axial direction is positioned below an opposite face of the clamper that faces the clamping magnet in the axial direction.

Abstract: Provided are a disc chucking method of preventing mis-chucking from occurring according to a state and direction of a disc loaded onto a tray when the tray is closed, and a disc driving apparatus for performing the disc chucking method. The method include: opening a tray on which a disc in which a first magnet is installed is loadable; moving a feeding unit to a position where attraction between a second magnet installed in the feeding unit and the first magnet is relatively low; and if the tray is closed, placing a center of the disc in a turn table.

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 chucking device includes a turntable fixed to a shaft having a central axis and a cone arranged axially above the turntable. An annular yoke is arranged above a sliding portion of the cone and fixed to the shaft, and a clamp magnet is fixed to the yoke through an adhesive agent. The yoke includes an upper surface having an annular recess defined in a concentric relationship with the central axis, the adhesive agent being applied on a region of the upper surface existing radially inwards of the recess. The recess includes a radial outer wall parallel to the central axis and a radial inner wall inclined radially inwards and axially upwards. The angle between the radial outer wall and a lower surface of the clamp magnet is greater than the angle between the radial inner wall and the lower surface of the clamp magnet.

Abstract: A spindle motor including a base, a bearing housing supported on the base, a bearing provided within the bearing housing, a rotating shaft rotatably supported by the bearing, a stator including a core fixed to the bearing housing and coils wound around the core, a rotor including a rotor yoke fixed to the rotating shaft, and a first magnet installed on the rotor yoke facing the stator, a turntable positioned on the rotor yoke, rotating together with the rotating shaft, a center guide member coupled to the rotating shaft at an upper side of the turntable, an elastic member disposed between the turntable and the center guide member for elastically supporting the center guide member.

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: The present invention provides a disk drive device that can appropriately clamp a disk by means of magnetic force even when the disk drive device is very small. A clamping magnet 16 on which a disk 20 is mounted is attached to a turntable portion 15b of a rotor frame 15 to attract the disk 20. The clamping magnet 16 is configured so that the disk 20 can be mounted on the clamping magnet 16. An area of the rotor frame 15 from the turntable portion 15b to a boss portion 15a is composed of a ferromagnetic material.

Abstract: The embodiments herein describe an apparatus and method for a reduced Z stack slot loading optical disc drive (ODD). In one embodiment, an optical disc mounting assembly can be used to chuck an optical disc to a turntable. The optical disc mounting assembly can include a hub spring for spring loading a hub and a clamping mechanism pivotally connected to the hub. In the described embodiment, in an extended position, the clamp is used to secure the optical disc to the turntable. The clamping mechanism can include a clamp pivotally attached to the hub at a pivot point. In the absence of the optical disc, the clamp is retracted and secured within a recess in the optical disc mounting assembly. In the presence of the optical disc, the mounting assembly chucks the optical disc to the turntable using the clamp and hub.

Abstract: An optical disc clamping device is provided. A driving bar is moved away from a center hole to synchronously drive a first linking bar and a second linking bar. A first pivotal rod and a second pivotal rod are respectively driven by the first slider and the second slider to move towards the center hole to drive a carrier which carries a chucking disk disposed thereon to contact a spindle motor. A suppresser is fixed at the rim of the center hole to press on the chucking disk to clamp the disc stably.

Abstract: A low-cost disk device with which the same spindle motor and clamper can be used for different types of disk device, such as a DVD drive. A clamper includes a clamper main body and a plurality of positioning components. The clamper main body clamps a disk between itself and a spindle motor that holds and rotates the disk. The plurality of positioning components are formed on the clamper main body for the relative positioning of the clamper main body and each of the plurality of spindle motors in the radial direction.

Abstract: A motor and a disk driver having the motor are disclosed. The motor in accordance with an embodiment of the present invention includes: a shaft; a boss, which is coupled to one end of the shaft; a bearing, which supports the other end of the shaft such that the shaft can rotate; a holder, which supports the bearing; a stator, which is coupled to the holder; a rotor, which is coupled to the boss and covers the stator; and a ventilation hole, which is formed on a lower surface of the boss such that air flows toward the stator. The motor in accordance with an embodiment of the present invention can make the flow of air around a disk stable by forming an air circulation structure, allowing air to flow from the inside to the outside of the motor.

Abstract: A motor includes a rotating body including a magnet, and a fixed body including a stator. The stator includes a stator core having an annular core back portion with an upper and a lower surface, and a plurality of circumferentially spaced-apart tooth portions extending from the core back portion in a direction away from the rotational axis, and a plurality of coils provided by winding a conductive wire around the tooth portions of the stator core with multiple turns. The rotor holder is arranged axially above the stator to cover the stator. Further, an annular or arc-shaped attracting magnet arranged to attract the rotor holder toward the stator is arranged radially inwardly of the core back portion, the attracting magnet having an upper surface axially facing toward the rotor holder, and a lower surface arranged axially below the upper surface of the core back portion of the stator core.

Abstract: A spindle motor and a mounting device for mounting a disk in a spindle motor are provided. The mounting device allows for a reduced number of parts, a reduction in product cost, a disk to be smoothly slid and securely mounted to a turntable, and prevents deforming of a disk during mounting. A center guide member is formed of a plastic material, into which the rotating shaft is inserted at an upper end of the turntable, so that it is capable of rising and descending thereon. The center guide member supports the disk. A back yoke is fixed at an upper side of the center guide member on the rotating shaft, to prevent disengaging of the center guide member from the rotating shaft. An outer portion of the center guide member gradually widens toward a lower end thereof, so that the disk can be inserted more securely.

Abstract: There is provided a disk recording and/or reproducing apparatus including: a disk mounting part; a clamp member holding a disk-shaped recording medium between the clamp member and the disk mounting part; and a support member movably supporting the clamp member. One of the disk mounting part and the clamp member has a magnet and the other has an attractable member attracted to the magnet. A rotating member is rotatably supported by the support member and a rotary elevating mechanism moves the rotating member up and down at a predetermined height by rotating the member. The clamp member is allowed to approach the disk mounting part by attracting the attractable member by a magnetic force of the magnet or to depart from the disk mounting part against a magnetic force of the magnet.

Abstract: The present invention relates to a clamping apparatus for a disc player which is able to accurately release a clamper from a turntable while improving miniaturization and thinning.

Abstract: A disk device, wherein a disk clamp unit is further thinned. The disk device is provided with a spindle motor (300) for positioning and rotating a disk, an alignment ring (301) fixed to the rotating shaft of the spindle motor, and a clamp section (400) for mounting the disk on the spindle motor (300). The alignment ring (301) is provided with a projection section (301C) formed around the rotating shaft of the spindle motor (300), and a magnet (302) provided around the rotating shaft with a space provided between the magnet (302) and the projection section (301C). The clamp section (400) is provided with a center member (401) having formed therein a recessed space (401G) in which the projection section (301C) is fitted, and also with a member (402) to be attracted which is attracted by the magnet (302).

Abstract: A spindle motor for an optical disc drive complements a loss of a function of automatically correcting a center of the spindle motor that may occur due to an excessive centrifugal force of an optical disc that is generated as the rotation speed of the spindle motor is increased. A conic outer circumferential surface of a slide cone closely contacts an inner circumferential surface of the optical disc so that a center of the optical disc is the same as a rotational center of the spindle motor The slide cone is cup-shaped so that the slide cone vertically slides in the direction of the rotation shaft. A cone yoke exerts a force to push the slide cone upwards in an axial direction so that an attractive force is used between the yoke and a magnetic cone yoke or an attractive force between the magnetic cone yoke and a clamp magnet.

Abstract: A motor is provided with a chucking device enabling attachment and detachment of a disk-shaped storage medium. In the motor, a turntable forming a portion of the chucking device is disposed axially above a rotor holder. The turntable has a placement portion on which the storage medium is placed. An inner recess is formed on an outer surface of a shaft between a position at which the rotor holder is fitted and another position at which the turntable is fitted. An outer recess is formed to radially face the inner recess and is concave away from a center axis. Adhesive is placed in the inner recess and the outer recess.

Abstract: A chucking device includes a turntable fixed to a shaft having a central axis and a cone arranged axially above the turntable. An annular yoke is arranged above a sliding portion of the cone and fixed to the shaft, and a clamp magnet is fixed to the yoke through an adhesive agent. The yoke includes an upper surface having an annular recess defined in a concentric relationship with the central axis, the adhesive agent being applied on a region of the upper surface existing radially inwards of the recess. The recess includes a radial outer wall parallel to the central axis and a radial inner wall inclined radially inwards and axially upwards. The angle between the radial outer wall and a lower surface of the clamp magnet is greater than the angle between the radial inner wall and the lower surface of the clamp magnet.

Abstract: A motor includes a chucking device to hold a disk having a central opening in a detachable manner. In the chucking device, a turntable part is arranged above a rotor holder and has a disk support surface for supporting the disk. An axially slidable cone part is arranged above the turntable part. A resilient member is axially arranged between the turntable part and the cone part upwardly biases the cone part. Further, the turntable part includes an inner table made of a metal and fixed to the shaft, and an outer table made of a resin material and fixed to an outside of the inner table. The outer table has the disk support surface and is axially spaced apart from the rotor holder in a position where the inner table and the outer table are fixed to each other.

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.

Abstract: When a motor rotates and a traverse mechanism integrated with a turntable pivots, a clamper holder moves downward together with the turntable whereby an end part of a first flange of the clamp holder abuts the bottom surface of a flange provided at an outer peripheral edge part at the upper end side of the clamper. The first flange is so arranged at the side opposite to the pivoting axis of the traverse mechanism as viewed from the center of the clamper. Further downward movement of the turntable separates the clamper from the turntable in such a manner as to leave the clamper in the clamper holder.

Abstract: Costs are reduced by rationalizing the process while maintaining the sliding performance with respect to a optical disk and a disk table and the reliability is improved. A plate 21 having a slidability film 17, which has heat-resistant, non-adhesive characteristics, on one side thereof is used as a material. A chucking plate is formed by subjecting the plate 21 to predetermined press processing from a side at which the slidability film is not formed, and is attached to a cartridge housing 2 such that a slidability-film-applied surface 8d faces a disk 5.

Abstract: The invention relates to a disk drive unit for a disk (D) to be used in a device for reading and/or writing the disk at high rotational speeds of the disk. It comprises a turntable (5) and a clamping mechanism (7, 11) to hold the disk firmly on the turntable. A clamper (7) thereof is adapted to be provided on a side of the disk (D) facing away from the turntable (4) and includes at least one magnetizable portion. A magnet (11) is provided in the turntable and is movable in a direction to and away from the magnetizable portion of the clamper A centrifugal operating mechanism (16-21) is adapted to cause the magnet to move towards and away from the magnetizable portion of the clamper in dependence of the rotational speed of the turntable.

Abstract: The invention provides increased stroke of the clamper and a reduction in thickness of the entire disk device by improving structures of a clamper for clamping the recording medium to turn freely and a clamper plate engaging with the clamper. Plural connecting sections that connect an inner torus and an outer torus, plural L-shaped hook sections at an upper end of an inner rim wall of substantially a cylindrical shape extended upward from a border of the connecting sections and the outer torus, and an outer rim wall of substantially a cylindrical shape extended upward from the outer torus are integrally formed on a clamper body. Engaging holes engaging with the L-shaped hook sections are provided in a clamper plate. A step section, an outer peripheral side of which is high, is provided in a position where an upper end of the outer rim wall collides with the clamper plate.

Abstract: A mounting device (30) for a data storage device (80) has at least one retaining hole (81) defined in each one of two opposite sides thereof. The mounting device includes a receiving member (40) and a retaining member (50). The receiving member includes a side wall (43) and a bottom wall (41). At least one fixing pin (433) is formed on the side wall. An elastic clip (415) is formed on the bottom wall with a protrusion (416) formed thereon. The retaining member is slidably attached to the receiving member. The retaining member includes a base wall (51) and a retaining wall (53). At least one fixing pin (533) is formed on the retaining wall. An opening (511) is defined in the base wall corresponding to the protrusion.

Abstract: A disk carrier device for carrying an optical disk having a plate in the center, which plate is capable of being attracted by a magnetic force, is disclosed. The disclosed disk carrier device includes an attracting unit including a permanent magnet that attracts and thereby holds the plate; and a holding mechanism configured to detachably hold the attracting unit.

Abstract: A motor is provided with a chucking device enabling attachment and detachment of a disk-shaped storage medium. In the motor, a turntable forming a portion of the chucking device is disposed axially above a rotor holder. The turntable has a placement portion on which the storage medium is placed. An inner recess is formed on an outer surface of a shaft between a position at which the rotor holder is fitted and another position at which the turntable is fitted. An outer recess is formed to radially face the inner recess and is concave away from a center axis. Adhesive is placed in the inner recess and the outer recess.

Abstract: A disk clamper (100) includes a clamper main body (1) and a lid body (2) that holds an attraction member (3) such as a magnet or the like between the clam main body (1) and the lid body (2). The clamper main body (1) includes a peripheral wall (12) whose outer peripheral surface constitutes a cylindrical surface. The lid body (2) includes a peripheral wall (22) fitted on the outside of the peripheral wall (12) of the clamper main body (1). Engaging claws (13) are formed on and protruded from the outer peripheral surface of the peripheral wall (12). Engaging claws (23) are formed on the inner peripheral surface of the peripheral wall (22). The clamper main body (1) and the lid body (2) can be integrated by fitting the peripheral wall (22) to the outside of the peripheral wall (12) in a state where the circumferential positions of the engaging claws.

Abstract: A disk cartridge includes a case accommodating a disk, a cover installed at the case to be capable of being open and shut and having a hole formed thereon to be open to an outside of the cover, a shutter installed under the disk in the case to be capable of moving to open and shut an opening formed on the case, and a clamping member installed at the cover to seal the hole to clamp the disk. Thus, since the clamping member blocks the hole of the cover connected to the outside of the cover, possibility of intrusion of dust into the disk cartridge is reduced. Also, since there is no need to install the clamping member at the disk drive, the disk drive can be made simplified and slim.

Abstract: An optical disk drive includes a base for holding an optical disk, a protrusion protruding out from the base that extends through the center hole of the optical disk when holding the optical disk, and at least one hook rotatably installed on the protrusion. When the disk drive stops, the hook is retracted to within the edge of the protrusion and when disk is rotated up to a predetermined speed, the hook extends out from the edge of the protrusion to hook the optical disk.

Abstract: A disk transfer device including a disk tray for holding a disk during the disk transfer action and a tray driving mechanism for driving the tray forward and backward between a first position which is the retracted location of the tray corresponding to a turntable in a disk drive and a second position which is the loading and unloading location of the disk outwardly of the disk drive. The disk tray is provided with a large diameter support region and a small diameter support region which is stepped down by a predetermined distance from the large diameter support region. A plurality of claws capable of engaging with the peripheral edge of the lower side of a small size disk are provided on the outer periphery of the small diameter support region.

Abstract: An optical disk clamping device. The device includes a diamagnetic member, a turntable, a magnet, and a clamping member. The turntable supports an optical disk. The magnet is disposed between the diamagnetic member and the turntable. The clamping member is disposed on the turntable to support the magnet. A repellent force is generated between the diamagnetic member and the magnet when the turntable rotates, pushing the magnet toward the clamping member to fix the optical disk.

Abstract: An optical disk drive having a turntable for carrying an optical disk with a clamping plate made of a magnetic material having a clamping area. A magnet is included for attracting to a turntable side the clamping plate of the optical disk placed on the turntable in a noncontact state. A motor is included for rotating the turntable with the optical disk placed thereon, wherein an attraction force of the magnet attracting the clamping plate is a value by which bending of the optical disk accompanied with the attraction of the clamping plate becomes within a permissible error range. A recording and reproducing apparatus may also incorporate the optical disk drive.

Abstract: An optical disk drive having a turntable for carrying an optical disk with a clamping plate made of a magnetic material having a clamping area. A magnet is included for attracting to a turntable side the clamping plate of the optical disk placed on the turntable in a noncontact state. A motor is included for rotating the turntable with the optical disk placed thereon, wherein an attraction force of the magnet attracting the clamping plate is a value by which bending of the optical disk accompanied with the attraction of the clamping plate becomes within a permissible error range. A recording and reproducing apparatus may also incorporate the optical disk drive.

Abstract: A turntable for a disk storage medium includes disk mounting section, shaft center boss and ribs. The disk mounting section includes disk mount surface, center boss and inner side surface. The disk mount surface is used to mount the disk medium thereon. The center boss has an outer side face that engages with a center hole of the disk medium. The inner side face defines a space that has a center axis aligned with that of the center boss. The shaft center boss includes an outer side face and a hole into which a rotating shaft is inserted so as to transmit a driving force to, and rotate, the disk medium. The ribs join the outer side face of the shaft center boss and the inner side face of the disk mounting section together so that through holes are formed between these side faces.

Abstract: An optical disk drive having a turntable for carrying an optical disk with a clamping plate made of a magnetic material having a clamping area. A magnet is included for attracting to a turntable side the clamping plate of the optical disk placed on the turntable in a noncontact state. A motor is included for rotating the turntable with the optical disk placed thereon, wherein an attraction force of the magnet attracting the clamping plate is a value by which bending of the optical disk accompanied with the attraction of the clamping plate becomes within a permissible error range. A recording and reproducing apparatus may also incorporate the optical disk drive.

Abstract: This chucking apparatus 1 is an apparatus for holding a disk 5 which has been placed on a turntable 3 of a disk player, and includes a magnet 13, a chuck disk 11, a chuck arm 17, first engaging faces 13b and second engaging faces 25c. The chuck disk 11 is arranged so as to be faced with the turntable 3, and adapted to hold the magnet 13. The chuck disk 11 is a disc-like member which has a plurality of claws 25 formed around the magnet 13 which has been held and projecting toward the turntable 3, and engaging parts 25a provided at distal end portions 25a of the plurality of claws 25 to be engaged with an outer circumference of the magnet 13. The chuck arm 17 holds the chuck disk 11 rotatably. The first and the second engaging faces 13b and 25c restrict the engaging parts 25a of the claws 25 from deflecting in a direction away from the magnet.

Abstract: It is an object of the invention to provide a clamping mechanism of a disc unit capable of sufficiently securing a moving distance of a clamper while reducing parts count compared with a conventional clamping mechanism and of rendering the disc unit low-profile. A cap made of a steed plate is engaged in a turntable 4 and a magnet which is magnetized at a bottom face of the turntable at a turntable side is engaged in the clamper. The clamper is freely engaged in an opening of a support member, and it is held by the support member in a state where the magnetized bottom face of the magnet is attracted to the support member to float. When the turntable rises, the cap approaches the magnet so that they attract each other, thereby setting the clamper on the turntable.

Abstract: A disk clamping apparatus for a disk player includes a turntable for receiving a disk, a disk clamper which clamps the disk placed on the turntable, and first and second magnetic bodies which are mounted in the corresponding turntable and the disk clamper and provide a clamping force to the disk by acting a reciprocal magnetic force on the turntable and the disk clamper. The first and second magnetic bodies are opposite to each other and partially overlap each other. In the disk clamping apparatus having the above structure, the variation in a clamping force caused by the variation in thickness of disks, received by the disk clamping apparatus, is very small. Accordingly, clamping and de-clamping of the disks having different thickness can be smoothly performed.

Abstract: A disc driving apparatus is provided with: a turn table on which a disc type record medium is loaded; a clamper opposed to the turn table for clamping the disc type record medium on the turn table by means of a magnetic force applied between the turn table and the clamper; and a spindle motor for rotationally driving the turn table. The clamper has at least 3 abutting portions for abutting to the disc type record medium such that only one of the abutting portions is respectively on a line passing through a center of the clamper in a plain parallel to a record surface of the disc type record medium.