Abstract: Disclosed is a motor including a rotor body mounted on a shaft and a chucking mechanism body mounted on a rotor hub, which are coupled with an increased coupling force by changing a coupling structure of the rotor hub of the rotor body and the chucking mechanism body mounted on the rotor hub. The motor includes: a sleeve rotatably supporting a shaft; a rotor body having a rotor hub mounted on the shaft; and a chucking mechanism body having a boss with a through hole in which the rotor hub is insertedly coupled and a space part formed within the boss and providing an elastic force when the rotor hub is coupled.

Abstract: A disk stabilizing plate is disposed oppositely below a thin disk for the purpose of allowing the thin disk to rotate stably, in a recording and reading device that uses a flexible thin disk for recording and reading. The disk stabilizing plate has a movable disk support member, relative to the prescribed rotation condition of the thin disk, that is caused to protrude upward from the surface of the disk stabilizing plate to touch and support the thin disk, or that is drawn downward from the surface of the disk stabilizing plate from the state touching and supporting the thin disk so that the state wherein the thin disk is touched and supported is terminated.

Abstract: A motor includes a turntable and a rotor holder unified with each other by insert-molding. The turntable includes a protrusion portion protruding radially outward beyond a cylinder portion and a substantially cylindrical covering portion extending downward from an radial inner end of the protrusion portion to cover an outer circumferential surface of the cylinder portion. The rotor holder has a radial outer end portion arranged in the same radial position as an outer circumferential surface of the covering portion or arranged radially inward of the outer circumferential surface of the covering portion. For this reason, a sliding contact area between a mold and the rotor holder is reduced. This helps suppress sliding contact between the mold and the rotor holder during a mold releasing process, consequently suppressing degradation of the mold.

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: Disclosed is an optical disc drive. The optical disc drive may include a clamp unit for chucking an optical disc; at least one lifting projection protruding from the clamp unit; and 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 through the lifting projection, wherein the moving force transfer unit includes a guide for moving the lifting projection in the axial direction by a movement in a direction perpendicular to the axial direction, and a protective part provided at least one of both ends of the guide and protecting the lifting projection. Accordingly, when an optical disc rotates at high speed, noise generation at a joined portion between the guide of the moving force transfer unit and the lifting projection can be suppressed.

Abstract: A spindle motor assembly includes a spindle motor, a disk for storing data, the disk being installed on the spindle motor, and a disk clamp for fixing the disk to the spindle motor. The disk clamp includes a hollow formed in a central portion thereof, a coupling portion formed around an external circumference of the hollow and including a plurality of screw insertion holes into which clamp fastening screws to be coupled to the spindle motor are inserted, and a pressing portion formed around an external circumference of the coupling portion to press the disk. The coupling portion includes a first region and a second region that are asymmetrical with respect to each other, the plurality of screw insertion holes are formed in the first region only, and a thickness extension portion or a through hole is formed in at least a portion of the second region.

Abstract: Disclosed herein is a slip prevention member for a turntable. A friction layer prevents a slip of a disk placed on an upper surface thereof. A hardness reinforcing layer is provided under the lower surface of the friction layer. An adhesive layer is provided under the lower surface of the hardness reinforcing layer. A releasable sheet is attached to the lower surface of the adhesive layer. The slip prevention member reduces use of environmentally toxic material and uses the hardness reinforcing layer, thus preventing occurrence of vibrations and noise which may be induced when the hardness of the slip prevention member is relatively low.

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 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 disk drive. The disk drive includes a motor, a hub coupled to a spindle shaft of the motor, at least two disks each having a center hole and being coupled to the hub, and a spacer having a center hole. The spacer is disposed around the hub such that the hub is disposed within the center hole of the spacer; and, the spacer is sandwiched between and in contact with the two disks to define spacing between the disks. The spacer includes at least two conductive rings and the conductive rings are secured between the two disks. The spacer also includes a damping sheet configured to absorb vibration between the conductive rings, and a conductive ring-shaped spring having a spring characteristic in a radial direction of the disks to make a diameter variable. Moreover, the conductive ring-shaped spring is in contact with both of the two conductive rings.

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 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: Disclosed herein is a disk drive motor which can prevent a disk from wobbling despite having a simple structure. The disk drive motor includes a turntable which is rotated by a drive unit and supports a disk thereon, and a disk support which is attached onto the turntable to support the disk thereon. Grooves are formed in the disk support. Each groove is inclined based on the radial direction of the turntable in the direction opposite to the direction in which the disk rotates. In the present invention, when a disk rotates, air which has been in a space between the turntable and the disk is discharged outside through the grooves, so that adsorption force is generated by a difference in pressure between the air and the space between the turntable and the disk. Therefore, the disk can be prevented from wobbling when rotating.

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: A mounting structure for an optical member comprising: an optical member; a holding member having the optical member mounted thereon; and a position adjustment member disposed between the optical member and the holding member, the position adjustment member configured to adjust a mounting position of the optical member.

Abstract: A move-sled-home device is used in an optical disc drive. The move-sled-home device includes a processing unit, a motor actuator, a sled, a sled motor, and a current-detecting unit. The processing unit outputs a control signal. The motor actuator generates a driving voltage according to the control signal. The sled motor generates a driving current according to the driving voltage to move the sled. The current-detecting unit is used for receiving and converting the driving current into an indicating signal, and issuing the indicating signal to the processing unit. During a move-sled-home action, the processing unit realizes a magnitude of the driving current according to the indicating signal, thereby determining whether the move-sled-home action is finished.

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 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: 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 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 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: 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 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 transportation body 1 for a flexible optical disk 10 has flexibility, and includes a rotation stabilizing board 2 having a disk-shaped form, an optical disk alignment unit 4 installed in the central part of the rotation stabilizing board 2, and a spacer 3 installed on a surface of the rotation stabilizing board 2. A combination of the transportation body 1 and the optical disk 10 can be treated as an equivalent of a conventional optical disk having rigidity, by transporting the flexible optical disk 10 placed on the transportation body 1 and by recording/reproducing information onto/from the flexible optical disk.

Abstract: The present invention provides a spindle motor assembly with an encoder. The spindle motor includes a circuit board, a spindle motor and an encoder. A connector is mounted on the upper surface of the circuit board. The spindle motor is provided on the circuit board. The spindle motor functions to rotate a disk placed thereon. The encoder is provided on the connector and senses a detection mark of the disk and thereby detects a rotating speed of the disk. As such, because the encoder is installed on the connector, the number of components is reduced, and the production cost can be thus reduced.

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 disc device capable of achieving a slimming down of a tilt adjusting portion is provided. A tilt adjusting portion 400, 500, or 600 is provided to adjust a light beam 303b emitted from an optical pickup 303 such that an optical axis 303c is set perpendicularly to a disc 200 loaded on a disc turning portion 302. As the tilt adjusting portion 400, 500, or 600, a turntable adjusting portion 600 for adjusting a tilt of the disc loading face of the disc turning portion 302, and an optical pickup adjusting portion 400 or 500 for adjusting a position of a frame 307 that holds an optical pickup driving portion 305 are provided. Therefore, a margin of adjustment in the adjusting portion can be reduced, the tilt adjusting portion 400, 500, 600 can be reduced in size, and a slimming down of a disc device 100 can be achieved.

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: 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, prevents deforming of a disk during mounting, and ease of mounting a disk. 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: An optical disk drive includes a bracket, and a mecha module installed on the bracket. The mecha module includes a mounting plate fixed on the bracket, an optical pick-up head installed on the mounting plate in a slidable manner for reading or writing data in an optical disk, and a spindle motor installed on the mounting plate for rotating the optical disk. The optical disk drive further includes a rotary mechanism connected to the bracket and a base for driving the bracket to rotate into or out of an opening on a housing relative to the base.

Abstract: An optical read/write apparatus causes a read/write light beam from illuminating means to strike only one side of an optical storage medium including stacked data storage layers each of which is readable/writeable separately from the other layers. In this case, the optical read/write apparatus operates so that data is read/written from/into a second data storage layer after fully recording a recordable area of a first data storage layer. Thus, light can be shone with uniform intensity across the substantially entire recordable area of the second data storage layer without using a complex read/write system even under such conditions that the transmittance to light of the first data storage layer in the recordable area may vary depending on whether any data is recorded in the recordable area.

Abstract: An optical read/write apparatus causes a read/write light beam from illuminating means to strike only one side of an optical storage medium including stacked data storage layers each of which is readable/writeable separately from the other layers. In this case, the optical read/write apparatus operates so that data is read/written from/into a second data storage layer after fully recording a recordable area of a first data storage layer. Thus, light can be shone with uniform intensity across the substantially entire recordable area of the second data storage layer without using a complex read/write system even under such conditions that the transmittance to light of the first data storage layer in the recordable area may vary depending on whether any data is recorded in the recordable area.

Abstract: An optical read/write apparatus causes a read/write light beam from illuminating means to strike only one side of an optical storage medium including stacked data storage layers each of which is readable/writeable separately from the other layers. In this case, the optical read/write apparatus operates so that data is read/written from/into a second data storage layer after fully recording a recordable area of a first data storage layer. Thus, light can be shone with uniform intensity across the substantially entire recordable area of the second data storage layer without using a complex read/write system even under such conditions that the transmittance to light of the first data storage layer in the recordable area may vary depending on whether any data is recorded in the recordable area.

Abstract: An optical read/write apparatus causes a read/write light beam from illuminating means to strike only one side of an optical storage medium including stacked data storage layers each of which is readable/writeable separately from the other layers. In this case, the optical read/write apparatus operates so that data is read/written from/into a second data storage layer after fully recording a recordable area of a first data storage layer. Thus, light can be shone with uniform intensity across the substantially entire recordable area of the second data storage layer without using a complex read/write system even under such conditions that the transmittance to light of the first data storage layer in the recordable area may vary depending on whether any data is recorded in the recordable area.

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 spindle motor includes a base plate, a stator, and a rotor. The base plate has a plurality of air-guiding holes. The stator includes a bearing portion and a plurality of coil portions. The bearing portion is fixed on the base plate. The coil portions are connected to and surrounded the bearing portion, and are disposed above the air-guiding holes. The rotor is rotatably mounted to the bearing portion and disposed adjacent the coil portions.

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: Drive units for a data medium, e.g. a CD or a DVD, generally comprise a turntable and a clamp. It would be advantageous to provide a drive unit having an improved torque 5 transmission from the rotatable parts of the drive unit to the disc. It would also be desirable to allow a better guiding of the disc into a centered position around the axis of rotation from the supporting surface. To better address one or more of these concerns, an embodiment of the invention provides a drive unit for a data medium, comprising a turntable and a clamp for clamping a data medium onto the turntable, wherein the turntable 10 and the clamp can be moved with respect to each other from an unclamped to a clamped position, and, in the clamped position, the turntable and the clamp comprise a form-fit torque transmission between them.

Abstract: A disk holder, disk alignment mechanism and disk drive employing same that for permitting accurate alignment of a disk are provided. The disk drive comprises a disk holder 10 that comprises a plurality of holder plates 11 that individually hold disks D, a drive unit 62 that plays back disks D, disk selectors 41A and 41B that form a space above and below a desired disk D by raising and lowering the holder plates 11, and a drive base 60 that moves the drive unit 62 into the space that is formed as a result of raising and lowering the holder plates 11. Disk hold links 17 and 18 comprising catches 17a and 18a respectively that engage with and disengage from the center hole of disk D are provided on the holder plates 11 such that the disk hold links 17 and 18 are able to turn, and a disk hold arm 16 that allows the disk hold links 17 and 18 to turn is provided so as to be able to perform a sliding movement.

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: 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: 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: An optical disk device of the present invention includes a spindle motor, an optical pick-up, and a rotation control portion. The spindle motor is a rotational drive portion that rotates an optical disk, on an information recording surface of which a plurality of addresses are recorded. The optical pick-up records an information signal onto and plays back the information signal from the information recording surface of the optical disk that is rotated by the spindle motor. The rotation control portion controls the rotation of the optical disk by the spindle motor. In this case, the rotation control portion performs control based on a first reference signal that can be read off the optical disk, such that the optical disk is rotated at a speed that is based on a specified clock count.

Abstract: A master disk exposing apparatus having: a turntable for rotating a master disk; moving means for horizontally moving the turntable in at least one direction; beam irradiating means for irradiating an electron beam toward the turntable, thereby forming a beam spot onto the turntable or the master disk; beam deflecting means for deflecting the beam; and control means for controlling the moving means, the beam irradiating means, and the beam deflecting means, wherein the control means includes initializing means for executing an initial operation to drive at least either the moving means or the beam deflecting means and make an origin of the beam spot coincide with a rotational center of the turntable at the time of activation. An apparatus and a method for easily adjusting a deviation between an origin of an irradiating position of the recording beam and the rotational center of the turntable are, thus, provided.

Abstract: In a laser processing method, a workpiece is set with respect to a jig having a laser passage hole and a relative position of the jig and the workpiece is determined so that the laser passage hole can face toward a target processing point on the workpiece. Then, laser light is irradiated on the target processing point through the laser passage hole while creating a stream of an inert gas flowing from a peripheral area of the target processing point toward the target processing point and flowing away from the workpiece through the laser passage hole.

Abstract: An optical disk drive includes a spindle motor, a power source, a microprocessor, and a comparator. The spindle motor is for supporting a disk. The power source supplies a first voltage to drive the spindle motor to rotate. The microprocessor signals the power source to supply a second voltage to slow down rotational speed of the spindle motor when receiving a power-off signal. The comparator compares the rotational speed with a predetermined value. The microprocessor signals the power source to stop supplying power to the spindle motor when the rotational speed is smaller than the predetermined value. A controlling method for controlling the spindle motor in the optical disk driver is also provided.

Abstract: An optical disk drive includes a device body. A turntable is disposed on the device body, for rotating a disk. There is an optical pickup head for reading and/or writing of data with the disk. A multi-segment cover assembly is shiftable between a folded position and a spread position. The multi-segment cover assembly, when in the folded position, allows loading and unloading of the disk on the turntable, and when in the spread position, has a larger area than when in the folded position, and contains and protects the disk on the turntable. The multi-segment cover assembly includes a plurality of pie-shaped cover sectors, rotatable about an axis defined concentrically with the turntable, for extending to nest in one another when in the folded position, and for spreading by offsetting from one another when in the spread position.

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 protruding portion 131 is formed on a surface of an optical base 110 on which a light source 101 is placed. A curing-type resin 140 is coated in a gap 132 between a light source holder 111 holding the light source and the protruding portion on the optical base, so that a sufficient securing strength is obtained against an external influence such as a drop impact by using only the curing-type resin, and heat generated from the light source can be efficiently released to the base.

Abstract: A motor driving device generates a first PWM control signal for PWM driving each phase (1u, 1v, 1w) of stator windings of a motor (1) and a second PWM control signal for synchronously rectifying the phases (1u, 1v, 1w) on the basis of a current command signal indicating the level of a current to be supplied to the motor (1) and a phase current signal indicating the level of a current actually supplied to the motor (1) and drives the motor (1) according to the first and second PWM control signals. The motor driving device includes a synchronous rectification control switching section (21) for controlling the presence or absence of a mask for the second PWM control signal according to a provided control switching signal.