Abstract: A washing machine having a balancer to offset unbalanced load generated during rotation of a drum. The washing machine includes a cabinet, a drum rotatably disposed in the cabinet, and a balancer mounted to the drum to offset unbalanced load generated in the drum during rotation of the drum. The balancer includes a balancer housing having an annular channel defined therein, at least one mass movably disposed in the channel, a magnet provided at one side of the balancer housing to restrain the mass, and a magnet case to receive the magnet.

Abstract: A disc clamp and a spindle motor having the same is provided, the disc clamp according to an exemplary embodiment comprising: a disc clamp body; a first disc balancer projected from the disc clamp body in the horizontal direction and configured to have a first thickness; and a second disc balancer bent downwards from an end of the first disc balancer to fix the disc and configured to have a second thickness, wherein an angle between a horizontal surface of the first disc balancer and the second disc balancer is in the range of 92° to 95°.

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: Disclosed is a disc clamp including a disc clamp body having a rotational axis hollow engaged with a rotational axis; a first disc balancer that is projected from the disc clamp body in the horizontal direction and formed in a first thickness A; and a second disc balancer that is bent downwards from an end of the first disc balancer in order to fix the disc and formed in a second thickness B, wherein an angle formed between a horizontal surface of the first disc balancer and the second disc balancer is from 92° to 95°.

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

Abstract: Disclosed is a spindle motor including a turn table on which a disk is mounted; a rotation shaft that is a rotational center of the turn table; and a ball balancer including a lace formed on the turn table and a ball stored in the lace in order to reduce a rotation vibration of the disk; wherein a gap Gr formed between the ball contacting an inner surface of the lace adjacent to the rotation shaft and an outer surface of the lace facing the inner surface is about 10% to 20% of the diameter of the ball.

Abstract: An optical disk drive is adapted for reading data from an optical disk. The optical disk drive includes a housing, a tray, and a read module. The tray is disposed in the housing and is adapted for ejecting from the housing. The read module is adapted for reading data from an optical disk. The read module includes a turntable and an optical read head. The turntable includes a number of engaging springs, in which at least one of the engaging springs include added material for superposing the center of the optical disk and the center of the turntable. Furthermore, the optical read head is adapted to move along a tracking path for reading data from the optical disk.

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 an apparatus for reading information recorded on the track of a data carrier (1). The apparatus comprises a rotating device (2) for supporting and rotating the data carrier (1) around an axis of rotation (3). The rotating device (2) comprises a turntable (21) and a motor (23) for rotating the turntable (21). The apparatus according to the invention is able to suppress a wobble introduced by the data carrier (1) when rotated. This is done by a flexible part (24) in the rotating device (2). In an embodiment the supporting surface of the turntable (21) comprises the flexible part (24). This allows the data carrier (1) to tilt in radial and tangential direction. The centrifugal forces, which are present when rotation the data carrier (1), are able to level the data carrier (1), thus reducing the wobble.

Abstract: A fabrication method of an optical disk drive is provided. The method adapted for alleviating the eccentric issue of a loaded optical disk. The optical disk drive, for example, includes a turntable having a plurality of engaging springs. The engaging springs are adapted to secure the optical disk through a hole in the center of the optical disk. The steps for fabricating the optical disk drive include the following: first, the eccentric degree of the optical disk caused by the engaging springs is measured. Then a result is obtained. According to the obtained result, material is added to at least one of the engaging springs or a part of original material is removed from at least one of the engaging springs.

Abstract: An optical disc drive includes a traverse deck having left and right sides to be balanced. The optical disc drive includes a main deck, a tray, a turntable, an optical pickup, a traverse deck, and a balancer. The optical pickup is mounted movably in the back-and-forth direction to emit light to an optical disc placed on the turntable to read and write information from and to the optical disc. On the traverse deck, the turntable is mounted at the front side of the traverse deck and the optical pickup is mounted movably in the back-and-forth direction. The balancer is mounted on the traverse deck to balance the weights of the left and right sides of the traverse deck.

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 method for reducing the altitudinal errors and run-out of a spindle motor is disclosed. The method includes the following steps. First is to mount a material layer on the loading surface. Then, a surface treatment is applied to the material layer until the average run-out of the surface of the material layer is below 10?2 mm during the running of the spindle motor, and the distance between the surfaces of the material layer and one end of a shaft of the spindle motor achieves an expected value.

Abstract: An automatic balancing apparatus is disclosed. The automatic balancing apparatus includes a plurality of magnets, magnetic fluid, and a rotatable housing. The magnets function as balancers. The rotatable housing has a moving path disposed along a peripheral direction of the rotation. Each of the magnets is moved through the moving path. The rotatable housing accommodates the magnets and the magnetic fluid.

Abstract: Disclosed is an apparatus for reading information recorded on the track of a data carrier (1). The apparatus comprises rotating means (2) for supporting and rotating the data carrier (1) around an axis of rotation (3). The rotating means (2) comprises a turntable (21) and a motor (23) for rotating the turntable (21). The apparatus according to the invention is able to suppress a wobble introduced by the data carrier (1) when rotated. This is done by a flexible part (24) in the rotating means (2). In an embodiment the supporting surface of the turntable (21) comprises the flexible part (24). This allows the data carrier (1) to tilt in radial and tangential direction. The centrifugal force which are present when rotation the data carrier (1), are able to level the data carrier (1), thus reducing the wobble.

Abstract: An auto-balancing apparatus for optical disk drives mainly includes a housing for holding a balance weight and a plurality of clamp mechanisms movable radially through the perimeter of the housing. The clamp mechanisms are engaged with a spindle of a spindle motor or the housing through elastic elements. When the spindle motor is not rotating, the balance weight is anchored at a desired position by the clamp mechanisms because of the elastic force of the elastic elements. When operating at high rotation speeds, the engagement force of the elastic elements exerted on the clamp mechanisms is smaller than the centrifugal force, and the balance weight may be moved freely to automatically reach a balanced condition.

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.