Abstract: There is provided a disk drive apparatus including a first chassis unit that has a pickup base at which an optical pickup and a disk table have been disposed, and a first base chassis to which the pickup base has been attached, and a second chassis unit that has a second base chassis and at which a chucking pulley has been disposed. A first rectifying plate part is provided at the first base chassis. A second rectifying plate part is provided at the second base chassis.

Abstract: An optical disc device includes: a loader body having a recess and slopes; a traverse chassis provided to the loader body and having a protrusion guided along the recess, the traverse chassis being vertically movable; a turntable provided to the traverse chassis, for mounting the optical disc; and a clamper which clamps the optical disc between the clamper and the turntable when the traverse chassis ascends relative to the loader body to a clamp position, in which when the traverse chassis is at a position lower than the clamp position, the protrusion is guided along the recess, and when the traverse chassis is at the clamp position, the protrusion is positioned inside the slopes.

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 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: Provided is a spindle unit. The spindle unit includes: a spindle motor having a rotation shaft; a turntable that is coupled to the rotation shaft and supports a data storage device; and a sliding cone coupled to the turntable so as to elastically move up and down and to be inserted into a hole formed at the data storage device. The sliding cone includes a bump protruding from a surface thereof, and the bump has a concave portion recessed downward from a center thereof.

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 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 optical disc device comprises a disc clamper. The disc clamper is provided with: a first member provided with a first circular disc, and with a plurality of upstanding pieces formed with predetermined spaces therebetween along a circle concentric to the first circular disc, the upstanding pieces having an engaging claw at the distal end thereof; and a second member provided with a second circular disc in which are formed a plurality of through-holes into which the plurality of upstanding pieces are inserted, and with a plurality of peripheral walls formed with predetermined spaces therebetween along a circle concentric to the second circular disc. Rotation in a state where the upstanding pieces have been inserted into the through-holes through the spaces between the peripheral walls causes the engaging claws to engage the peripheral walls.

Abstract: A spindle structure for an optical disc and an optical disc drive employing the spindle structure are provided. The spindle structure includes a spindle motor having a rotation axis, a spindle that is coupled to the rotation axis, and a sliding cone coupled to the spindle and inserted into a center hole of the optical disc. The sliding cone includes a plurality of hook-shaped guide rods extended toward the spindle, and the spindle includes guide holes, to which the plurality of hook-shaped guide rods are inserted into and coupled.

Abstract: A motor including: a rotor case having a chucking device, on which a disk is mounted, press-fitted and coupled thereto; disk support members mounted on an upper surface of the rotor case to support a bottom surface of the disk, and having each of flow path portions therebetween allowing for airflow in a space between the disk and the rotor case; and a push portion disposed in at least one of the rotor case and the disk support members to accelerate the airflow through the flow path portions when the rotor case rotates.

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: Various embodiments herein include utilities that facilitate the substantially flat and aligned mounting of optical tape segments on testing drums to increase testing accuracy of the tape segments. In this regard, a drum for testing optical tape media is disclosed having a substantially planar portion onto which first and second ends of an optical tape segment may be mounted to thereby secure the entire tape segment around an outer testing surface of the drum. Also disclosed is fixture that may be used to precisely mount and secure the tape segment over the outer mounting surface of a drum in a manner that reduces axial run-out and wrinkling of the optical tape.

Abstract: Provided is a disc clamping structure, a spindle structure, and an optical disc drive having the disc clamping structure. The disc clamping structure includes a chucking spring comprising a pressing portion pressing an upper surface of the clamper, and elastic portions surrounding the pressing portion and providing an elastic force toward the clamper. The disc clamping structure does not require a magnetic thrust as does the conventional optical disc drive.

Abstract: It is an object of the present invention to maintain a generation-preventing effect of a relative slip between a disc support surface and a disc member even when dust attaches to a surface of an elastic layer provided on the disc support surface of a turntable, and to suppress a surface deflection when the disc member rotates when the elastic layer is provided on the disc support surface. Provided is a turntable for rotatably supporting a disc member on a disc support surface in a state where the disc member is sandwiched and held between the turntable and a clamp member placed opposite thereto, wherein the disc support surface is provided with an elastic layer having a predetermined width, and configured to project from the disc support surface, and at least one of an outer peripheral part and an inner peripheral part of the elastic layer is provided with a high contact pressure portion of which a contact pressure generated by pressing the clamp member thereto is higher than that of other portion.

Abstract: A disk holding device for a disk having a center hole is provided. A disk holding mechanism 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 as actuator shifts the disk holding mechanism, to hold the disk by setting the disk holding mechanism in the holding position, and to release the disk by setting the disk holding mechanism in the release position. A regulating portion contacts a peripheral portion of an upper surface of the disk, to keep the disk retained on the disk holding mechanism by preventing skew relative to the disk holding mechanism. Preferably, the disk holding mechanism enters the center hole downwards and holds the disk on a lower side.

Abstract: A simplified disc-clamping mechanism is provided to decrease the number of parts and processes of the assembly of a disc-clamping mechanism. The disc-clamping mechanism has a clamping plate sandwiching a disc by cooperating with a turntable, and a clamp base rotatably holding the clamping plate. The clamping plate has a surface plate pressing a disc toward the turntable, a small-radius body portion having an outer diameter smaller than that of the surface plate portion, and a flange portion protruding more than an end portion in an axial direction of the small-radius body portion and being parallel to the surface plate portion. The clamp base is integrally formed while including a thin-plate shaped holding portion, a stopper piece, and a bent portion which extends from the holding portion.

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: 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: There is provided a motor including: a rotor case having a chucking device, on which a disk is mounted, press-fitted and coupled thereto; and disk support members mounted on an upper surface of the rotor case to support a bottom surface of the disk, and having each of flow path portions therebetween allowing for airflow in a space between the disk and the rotor case, wherein a push portion is disposed in at least one of the rotor case and the disk support members to accelerate the airflow through the flow path portions when the rotor case rotates.

Abstract: A cone part in a chucking device capable of freely attaching and detaching a disc having a disc shape includes an abutting portion for abutting an inner peripheral surface of a central through hole of the disc with substantially equal forces along an entire circumference thereof and aligning the disc. The cone part is made of a resin material having a high slidability than that of a material used for the disc.

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 support (611) that is substantially cylindrical so as to be received by a disk hole (1NA) and has a positioning portion (612) on a circumference adjacent to a first axial end is provided with a concave portion (613) of which both ends open to the circumference along a radial direction. A first engaging portion (614) protrudes from around the circumference at which a first axial end of the concave portion opens substantially opposes to the positioning portion with a gap equal to or more than a thickness of an optical disk (1N). A moving member (615) is disposed in the concave portion in a manner movable along a radial direction of the support. A second engaging portion (616) protrudes on an end of the moving member at a position corresponding to a second axial end of the concave portion.

Abstract: A motor includes a stationary unit, a bearing mechanism, a rotary unit, and a chucking device. The rotary unit includes a rotor yoke provided with a cover portion extending around the chucking device and designed to allow the storage disk to be directly or indirectly mounted thereto and a removal-preventing member fixed to the cover portion to prevent removal of the rotary unit from the stationary unit. The removal-preventing member made of metal. The removal-preventing member includes a removal-preventing portion, an upper fixing portion having a plurality of upper protrusions inserted into the through-holes of the cover portion and bent toward the upper surface of the cover portion, and a lower fixing portion making direct or indirect contact with the lower surface of the cover portion and cooperating with the upper fixing portion to fix the position of the removal-preventing portion in a direction parallel to the center axis.

Abstract: A cone part in a chucking device capable of freely attaching and detaching a disc having a disc shape includes an abutting portion for abutting an inner peripheral surface of a central through hole of the disc with substantially equal forces along an entire circumference thereof and aligning the disc. The cone part is made of a resin material having a high slidability than that of a material used for the disc.

Abstract: A simplified dist-clamping mechanism is provided to decrease the number of parts and processes of the assembly of a disc-clamping mechanism. The disc-clamping mechanism has a clamping plate sandwiching a disc by cooperating with a turntable, and a clamp base rotatably holding the clamping plate. The clamping plate has a surface plate pressing a disc toward the turntable, a small-radius body portion having an outer diameter smaller than that of the surface plate portion, and a flange portion protruding more than an end portion in an axial direction of the small-radius body portion and being parallel to the surface plate portion. The clamp base is integrally formed while including a thin-plate shaped holding portion, a stopper piece, and a bent portion which extends from the holding portion.

Abstract: Disclosed is a clamping apparatus including a case having a side surface on which a plurality of arm holes are formed; an arm, which moves inside and outside the case through one of the arm holes while being restricted by the case and has an upper part and a lower part that are guided by the case; and an elastic member installed inside the case to elastically support the arm.

Abstract: A spindle motor is provided. The spindle motor includes a base, a bearing housing, a bearing, a rotation shaft, a stator, a bushing, and a rotor. The bearing housing is installed on the base. The bearing is fixed inside the bearing housing. The rotation shaft is installed to be supported by and rotate on the bearing. The stator is disposed around the bearing housing. The bushing is coupled to the rotation shaft. The rotor is coupled to the bushing to rotate through interaction with the stator.

Abstract: A spindle clamp for supporting a disk includes a radial control member that is in contact with an opening through a jaw and that has a contour such that radial expansion of the jaw is induced during initial movement of the jaw toward a registration surface for seating the disk. However, the contour is such that further movement of the jaw toward the registration surface is an axial motion, rather than a combination of axial and radial motion. In one preferred embodiment, the jaw is unitary, but is configured to enable the radial expansion while having sufficient rigidity to reliably clamp a data disk seating on the registration surface. The jaw may include a lip which is configured to contact the major surface of the disk opposite to its contact with the registration surface.

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: 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 provides a lift device of a slot-in disk drive, which includes two straight slots formed on a side of a sliding component, two sliding pins protruding from a side of base adjacent to the sliding component or protruding from a fixing plate of a casing, a cover covering with the sliding component, two guiding pins protruding from an inner surface of the cover corresponding to the two straight slots for inserting into the two straight slots respectively, an one-humped traverse slot with two ends of different heights formed on a lateral side of the cover adjacent to the sliding bolt whereinto the sliding bolt inserts, and two lifting slots separately formed on the other lateral side of the cover whereinto the two sliding pins insert.

Abstract: Disclosed is an optical disc drive. The optical disc drive may include a clamp unit for selectively chucking an optical disc, a moving force transfer unit for transferring a moving force, of moving the clamp unit in an axial direction of the clamp unit, to the clamp unit, the moving force transfer unit being formed of a first synthetic resin material at least in part, and a lifting projection coupling body formed of a second synthetic resin material, coupled to at least one lifting projection protruding from the clamp unit toward the moving force transfer unit, and contacting the moving force transfer unit. Accordingly, noise generation at a joined portion between the moving force transfer unit and the lifting projection coupling body can be suppressed.

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: The position of an optical pickup with respect to a disk is maintained accurately by preventing the free end portion of a cantilever movable member from being displaced lower than its proper position during the rotation of the disk even if the movable member is heavy to have improved vibration characteristics. There are provided a movable member 4, a chassis 1, a clamp mechanism 3, and a cam mechanism 5. The cam mechanism 5 includes a shift lever 51 connected to the free end portion of the movable member 4 via elastic bodies 42 and a cam main body 55. Positioning means 8 is composed of a protrusion 53 on the shift lever 51, a stepped engaging surface 15 for supporting the protrusion 53 thereon, and a guide mechanism 71. There is also provided anti-positioning means 9 for disengaging the protrusion 53 from the engaging surface 15.

Abstract: A space for accommodating therein a portion of an optical pickup mechanism is arranged below a disk loading portion of a turn table member of a chucking mechanism of the present invention. The space is arranged axially below a disk mounting surface. Since such space is provided, a recording/reproducing portion will be allowed to move closer to a brushless motor, and therefore a second lens arranged further away from the brushless motor will be allowed to move radially inward of a recording/reproducing area of an optical disk.

Abstract: A disclosed disk clamping mechanism includes a turntable fixed on a rotational shaft of a spindle motor to rotate a flexible thin optical disk, a stabilizer member configured to suppress a run-out of the flexible thin optical disk by an applying aerodynamic force to the rotating flexible thin optical disk so as to stabilize the run-out of the rotating flexible thin optical disk, and a clamper movably supported in a center of the stabilizer member in a direction perpendicular to a surface of the flexible thin optical disk. In the disclosed disk clamping mechanism, the flexible thin optical disk is sandwiched between the turntable and the clamper such that the turntable and the clamper rotate the flexible thin optical member sandwiched in-between.

Abstract: The present invention relates to a disc loading apparatus that has the capability of simplifying the assembly while improving thinning and reducing the number of components. With a disc loading apparatus according to the present invention, a portion of a top panel of the frame is designed to be a second mounting unit and another portion of the top panel to be a first mounting unit, the upper surface of the second mounting unit is sagged downward more than the lower surface of the first mounting unit, notches are provided appropriately at the steeped unit between the first and the second mounting units, the second mounting unit is a portion of the disc guide, the interlocking mechanism is mounted on the upper surface of the second mounting unit, and the pair of disc detection members is mounted on the lower surface of the first mounting unit, and these detection members are arranged throughout the lower surface of the first mounting unit and the upper surface of the second mounting unit through the notches.

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: Disclosed herein is an optical disk drive device comprising an spindle motor rotating a turntable on which an optical disk is safely placed; a clamper adhering the optical disk to the turntable to clamp the optical disk into the turntable; and an upper case provided with a hollow part so opened as to make the clamper face the turntable, and a support part contacting and supporting the clamper as an edge of the hollow part, the support part being inclined against the turntable.

Abstract: A disk clamp mechanism includes a disk clamper (13), a main chassis (11), a disk clamper pushing member (14) and a resilient member (15). The disk clamper (13) has a contact surface (13a) contacting a disk, and a convex portion (13b) on a side opposite to the contact surface (13a). The main chassis (11) includes a frame body (11a) and a disk clamper holding member (11b) for holding the disk clamper (13). The disk clamper pushing member (14) has a pushing surface (14d) that pushes the convex portion (13b) of the disk clamper (13) toward the disk, and first and second end portions (14a, 14b) provided on both sides of the pushing surface (14d). The first end portion (14a) is swingably supported by the main chassis (11). The resilient member (15) urges the second end portion (14b) of the disk clamper pushing member (14) in the direction in which the pushing surface (14d) pushes the disk.

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 disk clamping apparatus of a spindle motor and a spindle motor having the same are disclosed, wherein the apparatus includes a case inserted into an inner periphery of a disk for integrally rotating with a rotation shaft coupled with a rotor yoke, a plurality of claws each formed at a predetermined gap in the case, an arm mounted between the claws in the case and having a body with a slanted surface and slantedly formed at an upper surface of the disk, guide rails each mounted at both lateral surfaces of the body and a disengagement prevention rails each mounted at each guide rail and curvedly formed at the bottom surface for contacting the rotor yoke, and an elastic member elastically supporting the body by being interposed between the body and the case.

Abstract: A disk clamping device includes clamp pawls 3, which project from or retract into through holes 22 formed in a turntable 2 to be rotated and driven by a disk rotating-and-driving motor 1; a rotating-and-elevating member 3, disposed rotatably and in an ascendable and descendable manner in synchronism with the turntable 2, when going up, causing the clamping pawls 3 to project from the through holes 22, and when going down, causing the clamping pawls 3 to retract into the through holes 22; and clamp releasing levers 6, 7 pushing down the rotating-and-elevating member 3 against a pushing-up and urging force, wherein the turntable 2 has pawl-receiving part protrusions 24 forming clamp pawl receiving parts, which are protruded on the underside of the turntable and communicate with the through holes 22; and the rotating-and-elevating member 4 has protrusion receiving holes 42 formed thereon into which the pawl-receiving part protrusions 24 are fitted at the time of upward movement of the rotating-and-elevating memb

Abstract: A disk reproducing apparatus with improved quality is provided which has a clamper and a clamper plate. By providing the clamp plate with connection portions radially extending from a radially inner peripheral portion toward radially outer peripheral portion of the clamp plate, the axial displacement relative to a clamp holder can be increased as compared to that in the existing structure. Moreover, by disposing the clamper on the radially inner peripheral portion of the clamp plate so as to be elastically deformable, the spacing in clamping can be increased to a drive part.

Abstract: A clamp structure in a disk playing device is structured so that a clamper and a turntable are magnetically coupled to each other to sandwich a disk and that one of the clamper and the turntable is separated from the other to release magnetic coupling and detach the disk. The clamp structure may include a disk stopper for supporting the disk when, for example, the turntable is to be separated from the clamper to prevent the disk and the clamper from following and moving together with the turntable. The disk stopper may be disposed so as to face a non-recording area except a recording area of the disk and the disk stopper may be structured by utilizing a part of a chassis or a feeding roller for feeding the disk.

Abstract: This invention provides a disk holding device which may include a plurality of disk holding members and a disk receiving part. The disk holding members may each be provided with a holding projection part projected from the inner periphery side toward the outer periphery side of the disk-formed recording medium; the holding projection part may be provided with an inclined surface displaced so as to be spaced away from the disk-formed recording medium as one goes from the inner periphery side toward the outer periphery side of the disk-formed recording medium in the condition where the disk holding members are inserted in the center hole.

Abstract: The invention provides an electronic device with a recording and/or reproducing apparatus having a claming mechanism having superior vibration resistance, capable of securely supporting the disk clamped via a clamper and a turntable. The electronic device according to the present invention comprises a supporting portion 41 having a retention frame 46 and a screw hole 44, wherein one end of a leaf spring 51 is locked thereto and the other end is screw-engaged thereto so that a depressed portion 51A of the leaf spring 51 is elastically in contact with a projection 32B of the clamper 32, by which the disk D clamped by the clamper 32 and the turntable 12 is biased without fail by the leaf spring 51. Thereby, the present invention enables to provide a clamping mechanism having enhanced vibration resistance.

Abstract: A disk-clamping device for a disk drive includes a mounting seat and a clamp member disposed above the mounting seat. Each of the mounting seat and the clamp member has a clamping plate. A resilient projection structure is disposed between the clamping plates of the mounting seat and the clamp member in such a manner that the projection structure collides against one of the clamping plates in order to reduce the noise generating due to collision between the clamping plates during the disk clamping operation of the disk drive.

Abstract: Disclosed is a clamping apparatus including a case having a side surface on which a plurality of arm holes are formed; an arm, which moves inside and outside the case through one of the arm holes while being restricted by the case and has an upper part and a lower part that are guided by the case; and an elastic member installed inside the case to elastically support the arm.

Abstract: An optical disk drive has a horizontal adjustment mechanism for a spindle motor formed thereon. The optical disk drive includes a horizontal adjustment mechanism, disposed between a base plate on a traverse module and a securing plate on the spindle motor, to regulate an inclination angle of an optical disc on the spindle motor relative to a laser pickup head.