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| Number | Title | Issue Date |
| 8164850 | Fluid dynamic bearing device, spindle motor, and disk drive apparatus including nickel coated bearing housing A fluid dynamic bearing device includes a sleeve having a bearing hole into which a shaft is inserted, the sleeve rotatably supporting the shaft to make relative rotation about a center axis and a bearing housing made of a cold-rolled steel plate or a galvanized ste... | 04/24/2012 |
| 8023224 | Apparatus to prevent sticking of spindle motor and hard disk drive having the same A hard disk drive includes a base, a cover coupled to an upper portion of the base to accommodate a plurality of parts between the cover and the base, a spindle motor including a FDB (fluid dynamic bearing) having an FDB fixing portion fixed to the base and an FDB r... | 09/20/2011 |
| 7986491 | Hard disk drive with disk separator for creating axial gaps between disks for access by read/write heads A hard disk drive (HDD) has a stack of disks mounted on a rotatable spindle with the disks being movable axially, i.e., in a direction parallel to the axis of rotation of the spindle. A disk separator is located inside the spindle and separates axially-adjacent disk... | 07/26/2011 |
| 7764463 | Fluid dynamic pressure bearing for spindle motors and storage disk drive devices and having ridge portions between grooves in the fluid dynamic pressure bearing A fluid dynamic bearing having a shaft (12) and a bearing sleeve (11) rotatably supported relative to each other. At least one of the shaft and the bearing sleeve is made of steel or stainless steel made of by weight C: 0.6˜1.20%; Si: 1.0% or less; Mn... | 07/27/2010 |
| 7724468 | Apparatus and method for correcting static and dynamic imbalance with a single mass in a hard disk drive An apparatus and method for correcting static and dynamic imbalance with a single mass in a hard disk drive is disclosed. The method provides for determining a static imbalance of a hard disk assembly and for determining a dynamic imbalance of the hard disk assembly... | 05/25/2010 |
| 7474501 | Outer hub assembly and spindle motor including the same in hard disk drive and method for servo-track writing A spindle motor, which rotates a plurality of data storage disks in a hard disk drive, the spindle motor including: a shaft; an inner hub rotatably installed on an outer periphery of the shaft; and a hub assembly, which includes: an outer hub detachably coupled to a... | 01/06/2009 |
| 7463446 | Two-plane balance for spindle motors In a spindle hub configured for rotation about an axis, through holes extend from a first end of the spindle hub to a second end of the spindle hub. The through holes are generally parallel to the axis. A method of achieving two-plane balance of a disc pack assembly... | 12/09/2008 |
| 7436625 | Disk drive spindle motor having a cavity defined by one of an upper surface of a stator support structure and a lower surface of a stator tooth A spindle motor includes a shaft defining a longitudinal axis, a hub, a bearing assembly disposed between the hub and the shaft for allowing the hub to rotate, and a stator. The stator includes an inner diameter, an outer diameter, a stator tooth having a distal end... | 10/14/2008 |
| 7391139 | Spindle motor and rotation apparatus A spindle motor which allows appropriate formation of communicating hole for compensating a pressure difference due to an error in working of dynamic pressure generating grooves and other components, easy formation of dynamic pressure generating grooves and readily ... | 06/24/2008 |
| 7375961 | Rotatable component support assembly for an electronics enclosure An electronics component support assembly and an electronics system assembly employing the component support assembly are provided. The component support assembly includes a rotatable base support and a component connector assembly. The rotatable base support is siz... | 05/20/2008 |
| 7370407 | Disc centering device A disc centering device includes a base plate, a chuck which is installed on the base plate, a hub unit which is detachably engaged to the chuck and receives discs to be stacked, disc pushers which are slidably provided outside the hub unit and include corresponding... | 05/13/2008 |
| 7369355 | Magnetic disk drive apparatus and manufacturing method of magnetic disk drive apparatus A magnetic disk drive apparatus includes a housing member with first and second faces opposed to each other, at least part of each of the first and second faces being opened, a first cover member for covering the first face of the housing member, a second cover memb... | 05/06/2008 |
| 7355817 | Head suspension assembly with femto-slider and disk device provided with the same A head suspension assembly of a disk device comprises a head having a femto-slider, which is flied by an air current generated between the slider and a surface of the recording medium as the recording medium rotates, and a recording element which is provided on the ... | 04/08/2008 |
| 7342746 | Disk drive including a balancing ring with a balancing weight attached to a lower end of a spindle motor hub A disk drive includes a disk drive base and a spindle motor including a spindle motor hub, a spindle motor shaft and a stator. The hub includes an upper end and a lower end. The hub is rotatably coupled to the base via the shaft for rotating the hub about an axis of... | 03/11/2008 |
| 7334243 | Vane integration into motor hub to enhance CD cooling The present invention relates to the cooling of electronic components such as CD or DVD players and recorders and the disc or discs within. Specifically, the present invention relates to the internal cooling of a disc playing or recording device and the disc or disc... | 02/19/2008 |
| 7327531 | Two-plane balance for spindle motors In a spindle hub configured for rotation about an axis, through holes extend from a first end of the spindle hub to a second end of the spindle hub. The through holes are generally parallel to the axis. A method of achieving two-plane balance of a disc pack assembly... | 02/05/2008 |
| 7321178 | Spindle motor In a spindle motor in which teeth portions of a stator core formed by laminating magnetic plates are bent in order to increase the number of turns of the stator windings, a gap in the teeth portions between the magnetic plates is avoided and a precise attractive for... | 01/22/2008 |
| 7315100 | Motor and magnetic bearing assembly thereof A motor comprising a stator, a rotor, and a plurality of blades. The stator comprises a stator base with an opening, a first magnetic structure disposed at a bottom of the opening, a magnetic pole disposed on the stator base, and a second magnetic structure disposed... | 01/01/2008 |
| 7312550 | Architecture for electric machine In one aspect, an alternator is described which includes a current control apparatus including a stator winding and a control winding, wherein current control in the control winding regulates the stator winding. In another aspect, a gas turbine engine includes a mul... | 12/25/2007 |
| 7300209 | Aerodynamic bearing assembly for spindle motor for hard disk drives Disclosed is an aerodynamic bearing assembly for a spindle motor for hard disk drives, in which a hub of the spindle motor is pivoted in both radial and thrust directions by the ball bearing, which directly contacts the center of the hub, to perform rotation accordi... | 11/27/2007 |
| 7294944 | Brushless motor A compact, highly accurate and inexpensive brushless motor is disclosed. A bearing is fixed to the inner periphery of a cylindrical portion of a housing, and a shaft is rotatably inserted through the bearing to cover the housing. A yoke arranged at the forward end o... | 11/13/2007 |
| 7295400 | Method and apparatus for mechanically balancing the disk pack of a hard disk drive The invention includes a method making a balanced disk pack for a hard disk drive, from a disk pack including a spindle motor rigidly coupled, and aligned by at least two open screw holes, with a disk clamp. The invention includes the resulting balanced disk packs, ... | 11/13/2007 |
| 7288923 | Voltage-limited electric machine An electric alternator having a rotor, stator and at least one winding in the stator adapted to conduct a current, the machine also having and first and second magnetic circuits around different portions of the winding which may be configured relative to one another... | 10/30/2007 |
| 7283325 | Apparatus and system for centering media disks on the hub of a spindle motor in a hard disk drive A device for centering and securing data storage disks to the hub of a spindle motor in a hard disk drive has a chamfer and a countersink on the top of the spindle motor shaft center. During the hard disk drive assembly process, a disk centering tool engages and use... | 10/16/2007 |
| 7265939 | Spindle motor and disk drive unit Disclosed is a spindle motor and a disk drive unit equipped with the same, having advantages of preventing hard collision between a disk and a signal conversion element due to lifting of rotating components, and avoiding the signal conversion element and swing means... | 09/04/2007 |
| 7265469 | Spindle motor having dynamic pressure fluid bearing A spindle motor includes a rotor section, a stator section, and thrust and radial dynamic pressure fluid bearings. The thrust dynamic pressure fluid bearing includes first and second thrust dynamic pressure fluid bearing sections each generating a dynamic pressure i... | 09/04/2007 |
| 7259966 | Apparatus, system, and method for reducing rotational vibration transmission within a data storage system An apparatus, system, and method are disclosed for reducing rotational vibration transmission within a data storage system. A storage device apparatus comprises a carrier having opposing first and second side plates. A support point may be disposed within the first ... | 08/21/2007 |
| 7237956 | Hydrodynamic bearing and disc rotation apparatus using the same A high-accuracy, long-life hydrodynamic bearing that does not cause oil film breakage in bearing clearances and a disc rotation apparatus using the bearing is disclosed. Oil film breakage is avoided as negative pressure is prevented from generating between the shaft... | 07/03/2007 |
| 7234868 | Radial pumping oil seal for fluid dynamic bearing motor An improved rotational motor, such as a spindle motor for a disc drive, is provided. The motor first comprises a hub having a shaft portion and a horizontal body portion. The motor also comprises a sleeve surrounding the shaft portion of the hub. A fine first vertic... | 06/26/2007 |
| 7227712 | Disk drive apparatus and method of mounting same A disk drive apparatus mounting socket includes a socket portion which supports a disk drive apparatus, a lead portion which is connected to the disk drive apparatus supported by the socket portion, and a terminal unit which is electrically connected to the lead por... | 06/05/2007 |
| 7218023 | Spindle motor The spindle motor includes a rotational shaft 30 which has a conical portion 34, whose outer surface gradually widens toward a thrust dynamic pressure bearing 70, and a straight portion 33 with a fixed outer diameter. Radial dynamic press... | 05/15/2007 |
| 7212376 | Disk drive system with hydrodynamic bearing lubricant having charge-control additive comprising dioctyldiphenylamine and/or oligomer thereof An improved disk drive system that employs a lubricant with improved charge control is provided. The disk drive system is comprised of a rotatably mounted magnetic disk. A rotor is coupled to the disk and rotatably retained by a stator. A bearing is formed that serv... | 05/01/2007 |
| 7199981 | High reliability-parallel data transfer hard disk drive A dual actuator arm assembly system that uses two pairs of actuator-carriage arms that linearly move over a stationary micro-rail independently. The geometric shape of the two pairs of actuator carriage arms conform to the arcs of the data tracks at an acute angle. ... | 04/03/2007 |
| 7196868 | Hydrodynamic bearing and disk recording/reproducing apparatus having a vent inside a fixed shaft Radial dynamic pressure grooves are provided in a first region 4A and a second region 4B on the side of a fixed shaft 2. A vent 2D is provided inside the top end 2A of the fixed shaft 2. The vent 2D connects spaces ov... | 03/27/2007 |
| 7190549 | Slim spindle motor and micro-drive apparatus comprising the same A slim spindle motor and a micro-drive apparatus including the slim spindle motor are provided. In the spindle motor, a hub is rotatably mounted on a base plate by ball bearings. The hub is used to seat a disk thereon. A ring-shaped magnet is engaged to the outer bo... | 03/13/2007 |
| 7190101 | Stator coil arrangement for an axial airgap electric device including low-loss materials A dynamoelectric, rotating electric machine includes a stator assembly that includes stacked stator coil windings. The machine is preferably a polyphase, axial airgap device. Improved slot filling results from the stacked stator coil configuration. Device performanc... | 03/13/2007 |
| 7188402 | Disc centering device A disc centering device includes a base plate, a chuck which is installed on the base plate, a hub unit which is detachably engaged to the chuck and in which a plurality of discs are stacked, disc pushers which are slidably provided outside the hub unit, and include... | 03/13/2007 |
| 7187518 | Flexible printed circuit for spindle motor and disk drive having the same A flexible printed circuit (FPC), electrically connecting a spindle motor on a base of a disk drive with a printed circuit board (PCB) outside of the base, and a disk drive including the FPC, are provided. The FPC includes a wiring portion having one end connected t... | 03/06/2007 |
| 7181824 | Method of installing a disk clamp over a hub of a disk drive A disk clamp is provided for securing one or more data storage disks to a disk drive without the need for screws. A preloading device is also provided for installing the disk clamp and removing the disk clamp after installation. The preloading device applies a load ... | 02/27/2007 |
| 7180703 | Disk drive comprising a spindle motor employing anionic/cationic lubricant to reduce disk surface potential A disk drive is disclosed comprising a disk, a head actuated over the disk, and a spindle motor for rotating the disk. The spindle motor comprises a rotating component, a stationary component, and a first and second bearing assembly disposed between the rotating com... | 02/20/2007 |
