Abstract: An abnormality diagnosis device according to the present invention detects damage to a bearing device based on vibration data on acceleration of the bearing device. The abnormality diagnosis device includes a first filter, a second filter, and a diagnosis unit. The first filter is configured to extract a first vibration waveform belonging to a frequency band from the vibration data. The second filter is configured to extract a second vibration waveform belonging to a second frequency band higher than the first frequency band from the vibration data. The diagnosis unit is configured to diagnose that there is damage to the bearing device when an evaluation value calculated by dividing a first amplitude of the vibration waveform by a second amplitude of a second vibration waveform at a time at which the first amplitude has occurred exceeds a determination value, the first amplitude exceeding a reference value.

Abstract: A lighting apparatus may include a printed circuit board (PCB) for supplying power, a light source electrically connected to the PCB and generating light, a reflector installed to be positioned at a front of the light source and positioned in a case and guiding the light generated from the light source together with the case, and a prism installed to be positioned at a front of the reflector and surround a dial plate and concentrating the light guided by the reflector and the case into the dial plate.

Abstract: A disk clamp that can engage a disk hub to couple a disk media to a disk hub, the disk clamp having a body portion, and a groove formed in a surface of the body portion and extending at least in a circumferential direction substantially parallel to at least a portion of the circumference of the disk clamp; and a balance weight installed in the groove formed in the surface of the disk clamp, the balance weight having a quantity of material applied in the groove. A disk drive assembly using the disk hub and a method of correcting a drive imbalance using the disk hub.

Abstract: A disk drive device includes: a hub on which a recording disk is to be mounted; a base member; a bearing unit configured to support the hub in a manner in which the hub can be relatively rotated with respect to the base member; an extended annular groove portion provided in part of the hub around the rotational axis of the hub; and a weight member that is installed in the extended annular groove portion to adjust a rotational balance when the recording disk is being rotated with the hub. The weight member has a fixing mechanism that is slidable, when installed, in the direction of the extended annular groove portion and that can substantially maintain a stopped state at a fixing position.

Abstract: A spindle motor having a turntable is disclosed, the spindle motor including: a bearing having a rotation hole; a bearing housing accommodating the bearing; a stator including a core secured at a periphery of the bearing housing and a coil wound on the core; a rotation shaft rotatably coupled to the bearing; a rotor coupled to the rotation shaft and including a magnet facing the core; a turntable body coupled to the rotation shaft and formed with a round groove at a bottom surface facing an upper surface accommodated by a disk; and a turntable including at least one ball accommodated in the round groove, where a rolling frictional coefficient between the turntable and the ball is in the range of 0.12˜0.16.

Abstract: A disk rotation device is provided, the device including: a bearing assembly including a bearing formed with a rotation shaft hole and a bearing housing that accommodates the bearing; a stator including a core secured at a periphery of the bearing housing and a coil wound on the core; a rotation shaft coupled to the rotation shaft hole; a rotor including a yoke secured at the rotation shaft and a magnet arranged at an inner lateral surface of the yoke facing a distal end of the core; and a turn table including a turn table body coupled to the rotation shaft, balls accommodated inside a circular trench of the turn table body and a cover member that blocks the trench, wherein a curve that line-contacts the balls is formed at an area where an inner lateral surface of the trench and a floor surface connected to the inner lateral surface of the trench meets.

Abstract: A chucking device includes a disk support unit on which a disk is placed, a resin-made turntable arranged to directly or indirectly support the disk support unit from below, a metal member including a circular plate portion closely secured to a lower surface of the turntable, and a plurality of balls rollably arranged below the disk support unit and above the circular plate portion about a center axis in a circumferential direction. The turntable includes an antiskid member, a bottom rolling surface arranged to support the balls from below through the antiskid member and a cylindrical side rolling surface positioned radially outwards of the balls.

Abstract: Disclosed is a spindle motor comprising: an integral turntable including: a table on which a rotating body to be installed, and an inner side wall and an outer side wall formed to be recessed upwards at a portion therebetween on a lower surface of the table so that a predetermined hollow is formed, a surface of thereof being formed slant; a ball cover for covering a ball inserted into the hollow and the hollow; a rotation shaft an upper portion of which is inserted into a center of the integral turntable; a bearing supporting a lower portion of the rotation shaft; a coil formed on an outside of the rotation shaft; and a magnet formed on an outside of the coil.

Abstract: Provided is a spindle motor. The spindle motor includes a rotatable shaft, a stator, a rotor, and a turntable. The stator is positioned around the shaft. The rotor includes a rotor yoke coupled to the shaft. The rotor is rotated with the shaft integratedly by a reaction with the stator. The turntable is coupled to the shaft. The rotor yoke and the turntable are coupled to each other and are fixed to the shaft.

Abstract: A spindle motor having a turntable is disclosed, the spindle motor including: a bearing having a rotation hole; a bearing housing accommodating the bearing; a stator including a core secured at a periphery of the bearing housing and a coil wound on the core; a rotation shaft rotatably coupled to the bearing; a rotor coupled to the rotation shaft and including a magnet facing the core; a turntable body coupled to the rotation shaft and formed with a round groove at a bottom surface facing an upper surface accommodated by a disk; and a turntable including at least one ball accommodated in the round groove, where a rolling frictional coefficient between the turntable and the ball is in the range of 0.12˜0.16.

Abstract: An auto-balancing device, as well as a turntable device and a disc driving device equipped with the auto-balancing device are disclosed. The auto-balancing device, which includes a housing, which is coupled with a rotating body, and in which an annular insertion groove is formed; a correcting ring, rotatably inserted in the insertion groove; and multiple correcting balls, positioned between the correcting ring and an outward inwall of the insertion groove, can reduce noise and vibration for a rotating body during acceleration and deceleration and during high-speed rotations.

Abstract: Disclosed is a spindle motor comprising: an integral turntable including: a table on which a rotating body to be installed, and an inner side wall and an outer side wall formed to be recessed upwards at a portion therebetween on a lower surface of the table so that a predetermined hollow is formed, a surface of thereof being formed slant; a ball cover for covering a ball inserted into the hollow and the hollow; a rotation shaft an upper portion of which is inserted into a center of the integral turntable; a bearing supporting a lower portion of the rotation shaft; a coil formed on an outside of the rotation shaft; and a magnet formed on an outside of the coil.

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 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 method for controlling a ball auto-balancing system of an optical disk drive is provided. A rotational member is fixed on a rotating axis of an optical disk drive and rotates synchronously therewith. A spindle motor drives the rotational member to accelerate and decelerate within the rotating speed range at least twice. When the spindle motor accelerates and decelerates for many times, if the measured central error value is greater than the last measured one, the accelerating and decelerating range is adjusted.

Abstract: Disclosed herein is a turntable allowing easy assembly of a magnetizing yoke, which includes a central guide part for helping seat a disc on the turntable, and a balancing part extending from the central guide part in a circumferential direction thereof and balancing the disc. In this case, the central guide part has an annular opening to which the magnetizing yoke is detachably coupled. The central guide part includes at least one coupling protrusion provided on a sidewall of the central guide part exposed to the annular opening, and the magnetizing yoke includes at least one coupling part which is provided along an edge of the magnetizing yoke and corresponds to the coupling protrusion. Further, the coupling part includes a coupling hole corresponding to the coupling protrusion, and a protrusion seat in close contact with the coupling protrusion. The protrusion seat is formed to be inclined downwards toward the coupling hole.

Abstract: Disclosed is a spindle motor comprising: an integral turntable including: a table on which a rotating body to be installed, and an inner side wall and an outer side wall formed to be recessed upwards at a portion therebetween on a lower surface of the table so that a predetermined hollow is formed, a surface of thereof being formed slant; a ball cover for covering a ball inserted into the hollow and the hollow; a rotation shaft an upper portion of which is inserted into a center of the integral turntable; a bearing supporting a lower portion of the rotation shaft; a coil formed on an outside of the rotation shaft; and a magnet formed on an outside of the coil.

Abstract: Disclosed is a spindle motor comprising: an integral turntable including: a table on which a rotating body to be installed, and an inner side wall and an outer side wall formed to be recessed upwards at a portion therebetween on a lower surface of the table so that a predetermined hollow is formed, a surface of thereof being formed slant; a ball cover for covering a ball inserted into the hollow and the hollow; a rotation shaft an upper portion of which is inserted into a center of the integral turntable; a bearing supporting a lower portion of the rotation shaft; a coil formed on an outside of the rotation shaft; and a magnet formed on an outside of the coil.

Abstract: Provided is a spindle motor. The spindle motor includes a rotatable shaft, a stator, a rotor, and a turntable. The stator is positioned around the shaft. The rotor includes a rotor yoke coupled to the shaft. The rotor is rotated with the shaft integratedly by a reaction with the stator. The turntable is coupled to the shaft. The rotor yoke and the turntable are coupled to each other and are fixed to the shaft.

Abstract: An auto-balancing device, as well as a turntable device and a disc driving device equipped with the auto-balancing device are disclosed. The auto-balancing device, which includes a housing, which is coupled with a rotating body, and in which an annular insertion groove is formed; a correcting ring, rotatably inserted in the insertion groove; and multiple correcting balls, positioned between the correcting ring and an outward inwall of the insertion groove, can reduce noise and vibration for a rotating body during acceleration and deceleration and during high-speed rotations.

Abstract: Disclosed is a spindle motor comprising: an integral turntable including: a table on which a rotating body to be installed, and an inner side wall and an outer side wall formed to be recessed upwards at a portion therebetween on a lower surface of the table so that a predetermined hollow is formed, a surface of thereof being formed slant; a ball cover for covering a ball inserted into the hollow and the hollow; a rotation shaft an upper portion of which is inserted into a center of the integral turntable; a bearing supporting a lower portion of the rotation shaft; a coil formed on an outside of the rotation shaft; and a magnet formed on an outside of the coil.

Abstract: Provided is a spindle motor comprising a stator and a shaft provided in the stator. A rotor is coupled with the shaft, and a turntable is connected with the shaft. The turntable has a ball container for receiving a plurality of ball, and the ball container has an inclined inner or outer wall. A ball cover is coupled with the ball container and having decelerating means. Herein, the decelerating means comprise an inclination or protrusions formed in the ball cover.

Abstract: A disk player having a self-compensating dynamic balancer which can limit internal vibrations generated by an eccentric center of gravity of a disk, and a turntable, a clamper and a spindle motor which incorporate a self-compensating dynamic balancer. The self-compensating dynamic balancer is formed integrally with rotating members in a disk player; that is, a turntable, a clamper and/or a rotor of a spindle motor. The self-compensating dynamic balancer includes at least one race which is integrally formed with the rotating member and rotates around a rotational shaft, a mobile unit which is located in the race to be capable of moving, and a cover member for covering an opening of the race. Thus, internal vibrations occurring due to the eccentric center of gravity of the disk can be effectively limited by the self-compensating dynamic balancer in which the mobile unit is disposed far away from the center of orbital rotation by a centrifugal force during rotation thereof.

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: Disclosed herein is a turntable allowing easy assembly of a magnetizing yoke, which includes a central guide part for helping seat a disc on the turntable, and a balancing part extending from the central guide part in a circumferential direction thereof and balancing the disc. In this case, the central guide part has an annular opening to which the magnetizing yoke is detachably coupled. The central guide part includes at least one coupling protrusion provided on a sidewall of the central guide part exposed to the annular opening, and the magnetizing yoke includes at least one coupling part which is provided along an edge of the magnetizing yoke and corresponds to the coupling protrusion. Further, the coupling part includes a coupling hole corresponding to the coupling protrusion, and a protrusion seat in close contact with the coupling protrusion. The protrusion seat is formed to be inclined downwards toward the coupling hole.

Abstract: A disk player having a self-compensating dynamic balancer so as to subdue internal vibrations due to an eccentric center of mass of a disk, a self-compensating-dynamic-balancer integrated turntable, a self-compensating-dynamic-balancer integrated clamper, and a self-compensating-dynamic-balancer integrated spindle motor which are employed in the disk player. The self-compensating dynamic balancer is embodied by forming a cavity in a turntable, clamper, a rotor of a spindle motor, or the like, and disposing movable members including movable rigid bodies and/or a liquid therein. Internal vibrations due to the eccentric mass of the disk are subdued effectively the movable members moving away from a revolution center according to respective centrifugal forces where the self-compensating dynamic balancer rotates.

Abstract: A method for reducing the stable rotation speed of an automatic ball balancing system is used with an automatic ball balancing system that has a rotor that has an annular track, with at least one ball provided for rotation inside the track. First, an optimum rotation speed ws that is between the unstable critical rotation speed wc of a ball and a working rotation speed w is first determined. In the next step, the rotor is accelerated to the optimum rotation speed ws. Next, the acceleration of the rotor is reduced until the balls are stationary relative to the track, and then the rotor is accelerated to the working rotation speed w.

Abstract: A spindle motor in an optical disc player includes a motor having a rotation shaft, a turntable rotating together with the rotation shaft and having a track groove having a circular shape, moving members disposed in the track groove to move along the track groove to compensate for an eccentric force, a collision and dispersion inducing unit having a height from the track groove to induce a rebounding phenomenon between the moving members to be spaced-apart from each other when the moving members are arranged in a non-uniform displacement due to a centrifugal force and a friction between the track groove and the moving members.

Abstract: Provided is a spindle motor comprising a stator and a shaft provided in the stator. A rotor is coupled with the shaft, and a turntable is connected with the shaft. The turntable has a ball container for receiving a plurality of ball, and the ball container has an inclined inner or outer wall. A ball cover is coupled with the ball container and having decelerating means. Herein, the decelerating means comprise an inclination or protrusions formed in the ball cover.

Abstract: A disk player having a self-compensating dynamic balancer so as to subdue internal vibrations due to an eccentric center of mass of a disk, a self-compensating-dynamic-balancer integrated turntable, a self-compensating-dynamic-balancer integrated clamper, and a self-compensating-dynamic-balancer integrated spindle motor which are employed in the disk player. The self-compensating dynamic balancer is embodied by forming a cavity in a turntable, clamper, a rotor of a spindle motor, or the like, and disposing movable members including movable rigid bodies and/or a liquid therein. Internal vibrations due to the eccentric mass of the disk are subdued effectively the movable members moving away from a revolution center according to respective centrifugal forces where the self-compensating dynamic balancer rotates.

Abstract: The present invention is intended to provide a disk drive apparatus capable of suppressing the occurrence of undesirable vibration due to the imbalance of a disk and capable of carrying out high-rate transfer, wherein a balancer is formed so as to accommodate a predetermined number of spherical bodies in a ring-shaped track portion having a predetermined shape, and this balancer is provided so as to be rotatable integrally and coaxially with the disk. In addition, in the disk drive apparatus of the present invention, the ring-shaped track of the balancer is divided into plural tracks by partition walls or the like, and a ball used as a balance member is disposed so as to be movable on each divided track. Furthermore, the disk drive apparatus of the present invention is configured so that the disk is held on both sides or one side thereof by using four or more projections or rubber sheets.

Abstract: A disk player having a self-compensating dynamic balancer which can limit internal vibrations generated by an eccentric center of gravity of a disk, and a turntable, a clamper and a spindle motor which incorporate a self-compensating dynamic balancer. The self-compensating dynamic balancer is formed integrally with rotating members in a disk player; that is, a turntable, a damper and/or a rotor of a spindle motor. The self-compensating dynamic balancer includes at least one race which is integrally formed with the rotating member and rotates around a rotational shaft, a mobile unit which is located in the race to be capable of moving, and a cover member for covering an opening of the race. Thus, internal vibrations occurring due to the eccentric center of gravity of the disk can be effectively limited by the self-compensating dynamic balancer in which the mobile unit is disposed far away from the center of orbital rotation by a centrifugal force during rotation thereof.

Abstract: To provide a disk drive apparatus that suppresses undesirable vibrations due to the unbalance of a loaded disk and achieves high-speed data transfer, the disk drive apparatus of the present invention comprises a hollow ring member (23) that contains therein a plurality of spherical bodies (24) or a liquid (26) to form a balancer or a balancer, wherein the balancer is formed so as to be rotatable in integral fashion with a disk, thereby suppressing the vibrations generated when an unbalanced disk is rotated at high speed.

Abstract: An auto-balancing device mounted on the spindle of the motor of a disk player is disclosed to include a device shell, which defines an inner annular track and an outer annular track concentrically arranged around the center hub thereof, a plurality of rolling balls movably received in the inner annular track, and a balancing fluid filled in the outer annular track and worked with the rolling balls to produce a balancing force during rotary motion of the motor of the disk player, and to further balance eccentricity of mass and prohibit the production of vibrations and noises.

Abstract: An auto balancing apparatus for a disk drive including a ball casing having a circular racing space installed concentrically with respect to a rotation member capable of rotating a disk. A plurality of balls roll along a racing face formed in the racing space for implementing a balancing operation. A guide member guides the movements of the balls. The proper guiding of the movements of the balls used for an auto balancing apparatus automatically corrects an unstable rotation of a disk and provides an accurate balancing operation.