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Rotational drive detail

Subclass of:

360 - Dynamic magnetic information storage or retrieval

360088000 - RECORD TRANSPORT WITH HEAD STATIONARY DURING TRANSDUCING

360970010 - Disk record

Patent class list (only not empty are listed)

Deeper subclasses:

Class / Patent application numberDescriptionNumber of patent applications / Date published
360990110 Stationary drive 1
20120120525Motor and recording disk drive device - There is provided a motor allowing for an increase in the rigidity of a hydrodynamic bearing by controlling a gap between a shaft and a sleeve as well as minimizing power consumption and a recording disk derive device including the motor. The motor includes a sleeve having a cylindrical shape and including a hole whose inner circumferential surface has at least one dynamic pressure groove therein; and a shaft rotatably inserted into the hole of the sleeve and having at least one rigidity reinforcing portion protruding in an outer diameter direction from an outer circumferential surface thereof corresponding to the dynamic pressure groove.05-17-2012
360990090 Movable drive 1
20080297944DISK REVERSING/TRANSPORTING MECHANISM AND DISK TESTER USING THE SAME MECHANISM - A grooved cam plate for vertically moving a roller as a crank pin is provided to move the roller vertically correspondingly to a movement of a movable table by slipping the roller in and slipping the roller up from the groove of the camp plate. A disk is reversed by the rotation of a chucking mechanism due to a half rotation of a crank shaft by the vertical movement of the roller.12-04-2008
Entries
DocumentTitleDate
20120162820SPINDLE MOTOR FOR DRIVING A HARD DISK DRIVE - The invention relates to a spindle motor, preferably for driving a hard disk drive, having a stationary motor component and a rotatable motor component that is rotatably supported with respect to the stationary motor component and that is driven by an electromagnetic drive system, at least one storage disk being fixed to the rotatable motor component using some means of mounting and fastening. According to the invention, at least parts of the rotatable motor component and at least parts of the means of mounting and fastening have a wear resistant surface coating or are subjected to a wear resistant surface treatment.06-28-2012
20100053807LUBRICATED LIMITER FOR FLUID DYNAMIC BEARING MOTOR - A component for restricting relative movement of a rotor and a shaft is disclosed. A motor may include a shaft and a rotor, where the rotor is disposed for relative rotation with respect to said shaft. A component is operable to restrict relative movement of the rotor and the shaft, where the component includes a first surface operable to receive a fluid.03-04-2010
20120170149SPINDLE MOTOR - Disclosed herein is a spindle motor, including: a rotating part having a rotating shaft and a magnet and a fixing part including a bearing supporting the rotating shaft and an armature corresponding to the magnet, the rotating part rotated by electromagnetic force of the magnet and the armature, wherein the fixing part includes: a plate supporting the rotating shaft; and a flexible circuit board mounted on the top portion of the plate and disposed between the plate and the armature to shield conduction therebetween.07-05-2012
20130077190BEARING APPARATUS, SPINDLE MOTOR, AND DISK DRIVE APPARATUS - A bearing apparatus includes stationary and rotating portions. The stationary portion includes a stationary shaft and a first cup portion. The rotating portion includes an annular recessed portion and first and second inner circumferential surfaces. Lubricating oil is arranged in a gap between the stationary and rotating portions. An upper surface of the lubricating oil is located between the second inner circumferential surface and an outer circumferential surface of the first cup portion. A lower surface of the lubricating oil is located between the rotating and stationary portions. The rotating portion further includes a through hole filled with the lubricating oil. One of the first cup portion and the rotating portion includes a pumping groove array arranged thereon to cause the lubricating oil to flow toward one end of the through hole during rotation of the rotating portion.03-28-2013
20100033870FLUID DYNAMIC BEARING, MOTOR, AND RECORDING DISK DRIVE APPARATUS - Channels and gaps inside a bearing mechanism are filled with lubricating oil, and the lubricating oil is retained in a first tapered seal portion arranged radially outward of a sleeve, and a second tapered seal portion arranged between the shaft and an upper cap placed above the sleeve. An arrangement of groove-shaped recessed portions on an inner circumferential surface of the upper cap and raised portions on a lower surface of a top portion thereof contributes to increasing a channel cross-sectional area of a channel provided between the upper cap and the sleeve to connect the first tapered seal portion with the second tapered seal portion.02-11-2010
20130083427MOTOR AND DISK DRIVE APPARATUS - A motor includes a shaft component, an upper plate portion, a lower plate portion, and a sleeve portion. The shaft component includes an inner shaft portion and an outer shaft portion. The upper plate portion defines a single monolithic member with one of the inner shaft portion and the outer shaft portion. The lower plate portion defines a single monolithic member with the other of the inner shaft portion and the outer shaft portion. The sleeve portion is disposed between the upper plate portion and the lower plate portion. A radial gap is defined between the sleeve portion and the outer shaft portion. A fixing range in which the outer shaft portion and the inner shaft portion radially overlap is arranged. At least a portion in an axial direction of the fixing range radially overlaps with an existing range in the axial direction of the radial gap.04-04-2013
20130083426MOTOR AND DISK DRIVE APPARATUS - A motor includes a shaft portion, an upper plate cylindrical portion, a lower plate cylindrical portion, and a sleeve portion disposed between an upper plate portion and a lower plate portion. The sleeve portion includes an inner sleeve cylindrical portion and an outer sleeve cylindrical portion. An upper seal portion is arranged between the outer circumferential surface of the upper plate cylindrical portion and the inner circumferential surface of the outer sleeve cylindrical portion. A lower seal portion is arranged between the outer circumferential surface of the outer sleeve cylindrical portion and the inner circumferential surface of the lower plate cylindrical portion. At least a portion of the upper seal portion and at least a portion of the lower seal portion radially overlap with a radial gap between the outer circumferential surface of the shaft portion and the inner circumferential surface of the inner sleeve cylindrical portion.04-04-2013
20130038964SPINDLE MOTOR HAVING CONNECTING MECHANISM CONNECTING LEAD WIRE AND CIRCUIT BOARD, AND STORAGE DISK DRIVE HAVING THE SAME - A spindle motor includes a base portion, a rotor hub, a stator, and a circuit board. The base portion preferably includes a through hole and is arranged to spread out radially around a central axis. The rotor hub is arranged above the base portion to rotate about the central axis. The stator is arranged above the base portion, and includes coils each including at least one lead wire. The circuit board is arranged radially outward of the through hole, and arranged on a lower surface of the base portion. The base portion includes a communicating groove arranged to join the through hole and the circuit board to each other. The at least one lead wire of the coils is arranged to pass inside the through hole and the communicating groove to be electrically connected to the circuit board. The through hole is sealed with a sealant.02-14-2013
20120262823DISK DRIVE DEVICE WITH HUB - The disk drive device includes a base member, a hub, a bearing unit which is arranged on the base member and which rotatably supports the hub, and a spindle drive unit which drives the hub to rotate. The spindle drive unit includes a stator core having a salient pole, a coil wound around the salient pole and a magnet opposed to the salient pole. The hub formed of magnetic material includes an outer cylinder portion engaged with an inner circumference of a recording disk and an inner cylinder portion to which an outer circumference of the magnet is fixed. The diameter of the inner cylinder portion is larger than the diameter of the outer cylinder portion.10-18-2012
20130135771SHROUD INTEGRATED COVER AND HARD DISK DRIVE INCLUDING THE SAME - There is provided a hard disk drive including: a bottom plate including a disk rotating by a motor; and a cover having a first wall member formed thereon, the first wall member inducing an airflow generated at the time of rotation of the disk.05-30-2013
20130027807ROTATING DEVICE USING A FLUID DYNAMIC BEARING - A disk drive device comprises: a hub; a base rotatably supporting the hub via a bearing; a core fixed to the base; a cylindrical magnet fixed to the hub; and a suction plate fixed to the base, the suction plate being arranged to face the cylindrical magnet in a direction along the rotational axis and made of magnetic material. The suction plate is arranged so that the minimum distance between the suction plate and the rotational axis is greater than the minimum distance between the cylindrical magnet and the rotational axis. A projection area created by projecting the cylindrical magnet onto a plane that is perpendicular to the rotational axis partially overlaps a projection area created by projecting the suction plate onto the plane.01-31-2013
20120182645ROTATING MACHINE COMPRISING INSULATION SHEET FOR INSULATING COIL AND BASE, AND METHOD OF PRODUCING THE ROTATING MACHINE - A rotating machine includes: a coil that is provided on the first surface side of a base and formed with a wire; an insulation sheet that has a sheet hole formed at the position aligned with the position of a guide hole in the base; and a wiring that is provided on the second surface and electrically connected to the coil. The wire forming the coil has a guide wire that is guided on the second surface side through the guide hole and the sheet hole to be connected to the wiring. The insulation sheet has an extending portion that protrudes from the sheet hole and covers at least part of the circumferential surface of the guide hole. The extending portion is placed between part of the circumferential surface of the guide hole and the guide wire.07-19-2012
20120182644RECORDING HEAD AND DISK DRIVE WITH THE SAME - According to one embodiment, a recording head includes a main pole, a trailing core, a first coil wound around the trailing core, a leading core, and a second coil wound around the leading core. The trailing core includes a return pole opposed to a trailing side of the main pole with a write gap therebetween, and side shields arranged individually on opposite sides of the main pole transversely relative to tracks and magnetically separated from the main pole at a distance not more than double a track pitch of the recording medium. The leading core includes a junction opposed to a leading side of the main pole with a gap therebetween and joined to the side shields with a width of 20 μm or less transversely relative to the tracks and a connecting portion joined to the main pole in a position off the recording medium.07-19-2012
20130070369SUSPENSION HAVING BONDING PADS WITH SOLDER LAYERS, MANUFACTURING METHOD OF A SUSPENSION, AND CONNECTING METHOD BETWEEN A SUSPENSION AND A SLIDER - A suspension includes a flexure and a plurality of electrical traces formed on the flexure. Each electrical trace has a trace body and a bonding pad arranged for connecting with a slider, and the bonding pad is a free end before connecting with the slider and is capable of bending to the trace body flexibly, and the bonding pad includes a trace body layer and a solder layer formed on the trace body layer, thereby the bonding pads of the electrical traces connecting with the slider by reflowing the solder layer. The present invention uses no extra solder balls, so as to reduce the manufacturing cost and the corresponding apparatus cost. The invention also discloses a manufacturing method of a suspension, and a connecting method for a suspension and a slider.03-21-2013
20130050872MOTOR AND DISK DRIVE APPARATUS - A motor includes a stationary unit and a rotary unit. The stationary unit includes a stator, a base portion having at least one hole extending in the up-down direction, and a flexible wiring substrate. The flexible wiring substrate reaches a position higher than a lower surface of the base portion through at least one hole and is arranged to supply electric power to the stator. The flexible wiring substrate includes a connection portion arranged higher than the lower surface of the base portion and connected to the stator. The connection portion includes a solder portion arranged on a lower surface thereof to cover a portion of a lead wire extending from a coil of the stator. At least a portion of the solder portion is positioned within the hole.02-28-2013
20130050871SPINDLE MOTOR AND DISK DRIVE APPARATUS - A spindle motor includes a stationary portion, and a rotating portion supported rotatably with respect to the stationary portion. The stationary portion includes a base portion, a ring-shaped core back, a plurality of teeth, and a coil. The rotating portion includes a magnet radially opposite to a radially inner end surface of the teeth and a hub arranged to hold the magnet. The teeth include an outer core portion arranged radially outward from an outer circumference of the hub, and an inner core portion arranged radially inward from the outer core portion. The inner core portion includes a positioning portion which is positioned radially outward from the outer circumference of the hub, and arranged radially inward from the coil, and the width of the positioning portion in a circumferential direction is larger than the width of the outer core portion in the circumferential direction.02-28-2013
20130063839HEAD-GIMBAL ASSEMBLY WITH A SUSPENSION-LEAD PAD HAVING A FORM THAT IS CONFIGURED TO INHIBIT FORMATION OF AN INTER-PAD SOLDER BRIDGE - A head-gimbal assembly (HGA) with a suspension-lead pad having a form that is configured to inhibit formation of an inter-pad solder bridge. The HGA includes a gimbal, a head-slider and a plurality of suspension-lead pads. The head-slider is coupled with the gimbal, and includes a plurality of head-slider pads. The plurality of suspension-lead pads is coupled with the plurality of head-slider pads by a plurality of solder bonds. A suspension-lead pad comprises a first lateral side, a second lateral side, a proximal side, disposed in proximity to a respective head-slider pad, and a distal side. A first width of the suspension-lead pad closer to the proximal side is substantially larger than a second width of the suspension-lead pad further from the proximal side than the first width. A disk drive including the HGA, and a head-slider with a head-slider pad having similar form to the suspension-lead pad are also provided.03-14-2013
20130163116SPINDLE MOTOR - There is provided a spindle motor. The spindle motor includes a fixed member; and a rotating member rotating relatively to the fixed member, and having oil filling a bearing clearance formed between the fixed member and the rotating member, wherein the fixed member and the rotating member are provided with an oil diffusion path communicating an air/oil interface formed at a boundary between the oil filled in the bearing clearance and air with the outside, and at least one of the fixed member and the rotating member is provided with at least one dummy oil groove opened to the oil diffusion path and having oil filled in at least a portion of the inside thereof.06-27-2013
20090231754FLUID DYNAMIC PRESSURE BEARING DEVICE, SPINDLE MOTOR AND DISK DRIVE APPARATUS - A fluid dynamic pressure bearing device includes a shaft, an annular member, and a rotating member. The annular member is fixed to or seamlessly defined with the shaft and is radially opposed to the rotating member. The annular member and the rotating member are covered with a seal member. A first gap is defined between the seal member and the annular member. A second gap is defined between the rotating member and the seal member. A third gap is defined between the annular member and the rotating member. The first gap preferably has a width smaller than that of the second gap but greater than that of the third gap.09-17-2009
20100202084DISK DRIVE DEVICE - In a brushless motor, the rotational frequency N (Hz) of the hub satisfies N08-12-2010
20110279925ROTATING DEVICE AND A METHOD FOR MANUFACTURING A ROTATING DEVICE - In a disk drive device, a magnetic recording disk is mounted on a hub. A base rotatably supports the hub via a bearing unit. The base has a ring-shaped wall that surrounds the bearing unit and that protrudes towards the hub. A laminated core is fixed to the base. The laminated core has a ring portion and twelve teeth that radially outwardly extend from the ring portion. Coils are wound around the twelve teeth. The base includes an increasing-thickness portion formed so that the less the distance between a part of the increasing-thickness portion and the ring-shaped wall is, the thicker the part of the increasing-thickness portion becomes.11-17-2011
20110299193FLUID DYNAMIC PRESSURE BEARING DEVICE, SPINDLE MOTOR AND DISK DRIVE APPARATUS - A fluid dynamic bearing mechanism includes a stationary shaft, a sleeve portion arranged to rotate with respect to the shaft, and a thrust portion including an upper end surface arranged oppose to a lower end surface of the sleeve portion. An inside surface of the thrust portion includes an inside surface contact portion arranged in contact with an outside surface of the shaft, and an inside surface lower non-contact portion spaced away from the outside surface of the shaft, and arranged to extend downward from a lower end of the inside surface contact portion. An outside surface of the thrust portion includes an outside surface inclined portion arranged in contact with an interface of a lubricating oil. The lower end of the inside surface contact portion is arranged at a level axially higher than that of a lower end of the outside surface inclined portion.12-08-2011
20110292543HEAD GIMBAL ASSEMBLY AND DISK DRIVE WITH THE SAME - According to one embodiment, a head gimbal assembly includes a suspension includes a load beam and a gimbal, a slider includes a head and mounted on the gimbal, a gap portion defined between the gimbal and the slider, in an area where the gimbal and an air inflow end of the slider overlap each other, and configured to accommodate contamination.12-01-2011
20090154008SPINDLE MOTOR AND RECORDING DISK DRIVE HAVING SPINDLE MOTOR - Using a simple and inexpensive method, a reliable spindle motor having a simple and inexpensive structure is afforded, in which contact failure of the FPC does not occur even when the motor undergoes external impact. An extending portion is provided radially outer side of an annular recess of a base. The extending portion has a step whose radially outer side is higher, and a through hole formed such as to pass through the base from its inside to outside. A FPC is disposed on an upper surface of a stator. The FPC is fixed to a lower surface of the base through the through hole. The bending height and the bending angle of the FPC are minimized by providing the step having appropriate height so that the FPC is not easily peeled off even when subject to external impact.06-18-2009
20120033330SPINDLE MOTOR AND STORAGE DISK DRIVE - In a motor, a stationary portion includes a shaft portion and an upper thrust portion arranged to define a single continuous monolithic member together with the shaft portion, and arranged to extend radially outward from an upper portion of the shaft portion. The shaft portion includes a female screw portion recessed axially downward from an upper end thereof. An upper end of the single continuous monolithic member defined by the shaft portion and the upper thrust portion includes an upper end annular surface arranged to extend radially outward from the female screw portion perpendicularly or substantially perpendicularly to the central axis. An outside diameter of the upper end annular surface is greater than a diameter of an outer circumferential surface of the shaft portion.02-09-2012
20120033328SPINDLE MOTOR AND STORAGE DISK DRIVE - A spindle motor includes a stationary portion and a rotating portion. The stationary portion preferably includes a shaft portion, an upper thrust portion, and an outer tubular portion. The rotating portion preferably includes an inner tubular portion, a flange portion, an upper hub annular portion, and a lower hub annular portion. The flange portion includes a communicating hole. An upper surface of a lubricating oil is located in a fifth gap defined between an upper thrust portion and an upper hub annular portion, while a lower surface of the lubricating oil is located in a sixth gap defined between an outer tubular portion and a lower hub annular portion. The communicating hole and a space extending from the fifth gap to the sixth gap through a fourth gap, a first gap, a second gap, and a third gap are continuously filled with the lubricating oil.02-09-2012
20120033324ROTATING BODY FOR FLUID DYNAMIC BEARING CAPABLE OF BEING THINNED AND BEING IMPROVED IN ROTATIONAL ACCURACY AND METHOD OF PRODUCING THE ROTATING BODY FOR FLUID DYNAMIC BEARING - A rotating body for a fluid dynamic bearing used for rotating a recording disk that has been mounted therein include: a rotating shaft portion in which a cylindrical portion that serves as a rotating shaft and a protruding portion extended radially outward from one end of the cylindrical portion are formed integrally with each other; and a hub that is to be connected to the end portion near to the outer circumference of the protruding portion and that has a mounting seat portion on which the recording disk is to be mounted.02-09-2012
20090190253Motor mount for interference suppression in a hard disk drive - A method for manufacturing a hard disk drive is described. The method includes providing a motor assembly, the motor assembly comprising a stationary portion and a rotatable portion for rotating a magnetic disk with respect to said stationary portion and providing a base for receiving the motor assembly. The method further includes providing an adhesive for mounting the motor assembly to said base wherein the adhesive is electrically conductive and mounting the stationary portion of the motor assembly to the base utilizing the adhesive such that the adhesive provides a low resistance path between the base and the motor assembly.07-30-2009
20090284866FLUID BEARING DEVICE, METHOD OF MANUFACTURING THE SAME, AND DISK DRIVE DEVICE - Provided is a fluid bearing device with a hub part having high molding precision and dimensional stability and capable of being produced at low cost. An annular gate (11-19-2009
20110199705DISK DRIVE ACTUATOR INERTIAL LATCH WITH MOMENT OF INERTIA AND MAGNETIC ATTRACTION PRODUCT RELATIONSHIP - According to one embodiment, a disk drive includes a carriage supporting a head configured to perform information processing for the recording medium, and a latch mechanism configured to latch and hold the carriage in a retracted position when an external force acts on the disk drive with the carriage being in the retracted position. The latch mechanism includes a latch member pivotable around an central axis between a latchable range and a released position. The latch member is configured to pivot in a latching direction within the latchable range before the engaging portion of the carriage starts to move when a rotational impact externally acts in a direction to pivot the carriage toward the information processing position with the carriage and the latch member being located in the retracted position and the latchable range, respectively.08-18-2011
20100277831FLUID DYNAMIC BEARING SYSTEM - The invention relates to a fluid dynamic bearing system having a first conical bearing and a second conical bearing working in opposition to the first conical bearing, wherein the two conical bearings are disposed along a stationary shaft, wherein the first and the second conical bearing each comprises a bearing cone disposed on the shaft having bearing surfaces as well as a conical counter bearing disposed in a rotor component that are separated from one another by a bearing gap filled with a bearing fluid, wherein the bearing gap has a first open end that is sealed by a first sealing gap partially filled with bearing fluid, wherein the bearing fluid in the sealing gap forms a fluid meniscus. According to the invention, the sealing gap is bounded by sealing surfaces of the bearing cone and associated sealing surfaces of the rotor component, wherein the smallest radius R11-04-2010
20080273263LUBRICATED LIMITER FOR FLUID DYNAMIC BEARING MOTOR - In one example, a FDB motor having a top-cover attached, EM biased bearing system is provided. The motor includes a shaft and rotor disposed for relative rotation, and an axial limiter for restricting axial movement of the rotor with respect to the shaft, wherein the axial limiter is wet or lubricated during contact. The limiter is spatially fixed with respect to one of the shaft or the rotor and disposed with an axial end surface opposing a surface portion spatially fixed with respect to the other of the shaft or the rotor to form a gap therebetween. The gap may be filled with a fluid such as bearing lubricant, thereby providing a lubricated or wet contact surface to restrict axial movement of the shaft and rotor. Additionally, one or both surfaces may include a groove or slot to provide circulation of fluid through the gap.11-06-2008
20080291569Base Dam in a Data Storage System to Reduce or Eliminate Motor Leakage - A base for a data storage system is provided having an inner facing surface and an outer facing surface. The base includes a motor well. Formed with inner surface of facing surface of the base includes a medium region, an actuator region and a dam. The medium region is defined by a medium region planar surface surrounding a portion of the motor well, a leading surface and a trailing surface. The actuator region is defined by an actuator region planar surface that is recessed from the medium region planar surface, the leading surface, the trailing surface and a remaining portion of the motor well. The dam has a dam planar surface that surrounds the remaining portion of the motor well and is positioned on the actuator region planar surface between the leading surface and the trailing surface.11-27-2008
20080278850MOTOR - When a sleeve of a fluid dynamic bearing is manufactured, its inner peripheral surface is formed by cutting. On the inner peripheral surface, first and second inclined surfaces are formed by a first cutting process such that a distance between the sleeve and a central axis is increased toward an upper end surface of the sleeve. Then, an upper bearing surface and a third inclined surface between the upper bearing surface and the first inclined surface are formed on the inner peripheral surface of the sleeve by a second cutting process of accuracy higher than that of the first cutting process. In the second cutting process, it is possible to form accurately in position a boundary between the upper bearing surface and the third inclined surface in contact with an upper end of an upper dynamic pressure groove provided on the upper bearing surface.11-13-2008
20120033326SPINDLE MOTOR AND STORAGE DISK DRIVE - A spindle motor includes a stationary portion and a rotating portion. The stationary portion preferably includes a shaft portion, a lower plate portion, and an outer tubular portion. The rotating portion preferably includes an inner tubular portion and a flange portion including a communicating hole. An upper seal portion is arranged radially outward of a first gap, and a lower seal portion is arranged radially outward of a second gap. The upper and lower seal portions are arranged in communication with each other through the communicating hole. The communicating hole and a space extending from the upper seal portion to the lower seal portion through the first gap, the second gap, and a third gap are filled with a lubricating oil. The third gap includes a dynamic pressure generation portion arranged to produce a radially inward pressure acting on the lubricating oil.02-09-2012
20100142087Variable Track Width Recording Compensation - Method and apparatus for providing a storage medium with variable track widths. In accordance with various embodiments, a data storage medium is rotated by a motor. A write transducer is used to write concentric data tracks to the storage medium during said rotation. The tracks are provided with variable track widths established by selectively changing a rotational velocity of the medium. The variable track widths can be gradual and/or abrupt, depending on the requirements of a given application. Gradual variations in track width can be used by a linear actuator with a linear translation path to emulate tracks written along a pivot translation path of a rotary actuator. Abrupt variations in track width can be used to provide different zones of tracks having different specified track widths. The tracks may be written using an electron beam recorder (EBR) with a constant write beam power level.06-10-2010
20090161253BEARING MECHANISM, MOTOR AND STORAGE DISK DRIVE APPARATUS - A bearing mechanism includes a cylindrical bottom-closed sleeve unit; a shaft unit radially supported by the sleeve unit via a lubricant; and an elastic thrust plate on an inner bottom surface of the sleeve unit to contact an end portion of the shaft unit at a position on a central axis to rotatably support the shaft unit. The shaft unit has a first contact portion, and the sleeve unit has a second contact portion. The contact portions are so arranged that, when a force acting from above the inner bottom surface is applied, movement of the shaft unit is restrained by the contact portions making contact with each other. Further, a distance between the contact portions prior to the force being applied is smaller than the displacement of the shaft unit at which the thrust plate gets so pressed by the shaft unit to be permanently deformed.06-25-2009
20120287534Reader sensor, magnetic head, head gimbal assembly and disk drive unit with the same - A reader sensor comprises a first shielding layer, a second shielding layer, a read element formed therebetween, and a pair of permanent magnet layer respectively placed on two sides of the read element; and it further comprises a magnetic field generating means formed beside the read element and arranged for providing a magnetic field with a direction perpendicular to the first shielding layer and the second shielding layer, thereby stabilizing the reading performance of the reader sensor. The invention can stabilize the reading performance, ameliorate the unstable defective reader sensor, and decrease the waste and the manufacturing cost. The present invention also discloses a magnetic head, a HGA and a disk drive unit.11-15-2012
20120069467MAGNETIC RECORDING MEDIUM AND MAGNETIC DISK DRIVE USING THE SAME - The present invention provides a magnetic recording medium and a magnetic disk drive using the same, capable of keeping flying height and posture of the head slider constant when a discrete track medium (magnetic recording medium) includes tracks as data zones, and non-data zones (groove) formed between adjacent tracks. The width of the discrete servo field for locating the position of the track in the radial direction is set to be smaller than a width of an end of a center pad formed on a head slider of the magnetic disk drive03-22-2012
20090103207ROTOR HUB, SPINDLE MOTOR AND HARD DISK DRIVE - In a method for manufacturing a rotor hub for use in a spindle motor, free-cutting stainless steel is used as a material of the rotor hub. A slug of free-cutting stainless steel is subjected to a plastic working to form a disk mounting portion and a cylindrical surface positioned radially inwardly of the disk mounting portion. Then, a cylindrical disk fitting surface is formed by machining substantially the entirety of the cylindrical surface. The rotor hub contains A-type inclusions appearing in a cross section taken along a center axis of the disk mounting portion. The A-type inclusions are oriented in directions different than the center axis.04-23-2009
20090161252DISK DRIVE DEVICE - The present invention provides a disk drive device that can appropriately clamp a disk by means of magnetic force even when the disk drive device is very small. A clamping magnet 06-25-2009
20130215531DISK DRIVE DEVICE PROVIDED WITH FLUID DYNAMIC BEARING - A sleeve supports a shaft. A housing member is arranged so as to surround the sleeve and make the end of the sleeve protrude. A base member holds the housing member and fixes a stator core so as to surround the housing member. A hub drives a recording disk by being rotated integrally with the shaft, with a magnet being fixed to an annular portion concentric with the shaft so as to face the stator core fixed to the base member. A thrust member is rotated integrally with the hub, and a descender portion and a ring portion.08-22-2013
20100238590DISK DRIVE DEVICE ROTATIONALLY DRIVING RECORDING DISK - A disk drive device is provided with a base, a hub on which a recording disk is to be mounted, a bearing unit arranged on the base and configured to rotatably support the hub, and a spindle drive unit configured to rotatably drive the hub. A circumferential ring wall portion is arranged on the outer circumference of the base and formed of a plastic.09-23-2010
20120033327SPINDLE MOTOR AND STORAGE DISK DRIVE - A motor includes a stationary portion and a rotating portion. The rotating portion includes a sleeve portion. The sleeve portion includes a communicating hole. A dynamic pressure bearing is defined in a first gap between a shaft portion and the sleeve portion. An upper seal portion and a lower seal portion are arranged radially outward of the dynamic pressure bearing. The upper seal portion and the lower seal portion are arranged in communication with each other through the communicating hole. The communicating hole and a space extending from the upper seal portion to the lower seal portion through the first gap are filled with a lubricating oil. A fixing region where an outer tubular portion and a base portion are fixed to each other is arranged to overlap with the dynamic pressure bearing in a radial direction in plan view.02-09-2012
20120033325SPINDLE MOTOR AND STORAGE DISK DRIVE - A dynamic pressure bearing is defined in a first gap between a shaft portion and a sleeve portion. An upper seal portion extending upward and a lower seal portion extending downward are arranged radially outward of the dynamic pressure bearing. Each of the upper seal portion and the lower seal portion includes a surface including a lubricating oil located therein. The upper seal portion and the lower seal portion are arranged in communication with each other through a communicating hole defined in the sleeve portion. The communicating hole and a space ranging from the upper seal portion to the lower seal portion through the first gap are filled with the lubricating oil. The axial distance between the surfaces of the lubricating oil in the upper seal portion and the lower seal portion is arranged to be shorter than the axial distance between an upper end and a lower end of the dynamic pressure bearing.02-09-2012
20110032639ELECTROSTATIC DISCHARGE APPARATUS FOR HUB AND SPINDLE ASSEMBLIES - An electrostatic discharge apparatus for use with a hub and spindle assembly for a disc drive storage system comprising a spindle; a hub rotatably mounted on the spindle; a capsule formed at least in part from an electrically conductive material that can be placed in electrical communication with the hub and defining a chamber configured to hold an electrically conductive fluid and defining at least one capillary channel in fluid communication with an opening formed in the capsule, the opening configured to permit rotation about the spindle, and to permit a meniscus formed by the conductive fluid proximate to the opening to electrically contact the spindle during rotation of the hub about the spindle.02-10-2011
20090141395MOUNTING METHOD FOR STORAGE MEDIUM - In one example embodiment, there is provided a storage-medium mounting method that includes detecting a rotation center axis of a rotor by rotating the rotor relative to a stator, the rotor being rotatably supported by the stator. The storage-medium mounting method includes mounting a storage medium on the rotor while aligning a center axis of the storage medium with the rotation center axis of the rotor.06-04-2009
20110122529SPINDLE MOTOR, DISK DRIVE APPARATUS AND METHOD FOR MANUFACTURING THE SPINDLE MOTOR - A hub includes first and second side surfaces respectively opposed to inner and outer circumferential surfaces of an upper portion of a magnetic member, and a ceiling surface arranged to interconnect an upper ends of the first and second side surfaces. The adhesive agent is interposed between the inner circumferential surface of the upper portion of the magnetic member and the first side surface of the hub and between the upper surface of the magnetic member and the ceiling surface of the hub. Radial distance between the inner circumferential surface of the upper portion of the magnetic member and the first side surface of the hub and axial distance between the upper surface of the magnetic member and the ceiling surface of the hub are smaller than radial distance between the outer circumferential surface of the upper portion of the magnetic member and the second side surface of the hub.05-26-2011
20090034118FLUID DYNAMIC BEARING DEVICE, SPINDLE MOTOR AND DISK DRIVE APPARATUS - 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 steel plate, the sleeve being received within the bearing housing. The bearing housing is filled with lubricating oil mainly composed of ester. A radial dynamic pressure bearing portion is provided between an outer circumferential surface of the shaft and an inner circumferential surface of the sleeve, the radial dynamic pressure bearing portion having radial dynamic pressure grooves for holding the lubricating oil as working fluid and for inducing a fluid dynamic pressure in the lubricating oil during the relative rotation. At least a surface region of the bearing housing remaining in contact with the lubricating oil is coated with a layer mainly composed of nickel.02-05-2009
20110242701MAGNETIC HEAD AND DISK DRIVE WITH THE SAME - According to one embodiment, a magnetic head includes a main pole configured to apply a perpendicular recording magnetic field to a recording layer of a recording medium, a return pole opposed to the trailing side of the main pole with a write gap therebetween and configured to reflux magnetic flux from the main pole to form a magnetic circuit in conjunction with the main pole, a coil configured to excite magnetic flux in the magnetic circuit includes the main pole and the return pole, a plurality of high-frequency oscillatory elements individually interposed between the main pole and the return pole, includes a plurality of magnetic films different in magnetic resonance frequency, and configured to individually apply high-frequency magnetic fields to the recording medium, and an electrical circuit configured to energize the high-frequency oscillatory elements.10-06-2011
20100053806DISC DRIVE APPARATUS - A disc drive apparatus comprises: a spindle motor 03-04-2010
20110249362SPINDLE MOTOR HAVING CONNECTING MECHANISM CONNECTING LEAD WIRE AND CIRCUIT BOARD, AND STORAGE DISK DRIVE HAVING THE SAME - A spindle motor includes a base portion, a rotor hub, a stator, and a circuit board. The base portion preferably includes a through hole and is arranged to spread out radially around a central axis. The rotor hub is arranged above the base portion to rotate about the central axis. The stator is arranged above the base portion, and includes coils each including at least one lead wire. The circuit board is arranged radially outward of the through hole, and arranged on a lower surface of the base portion. The base portion includes a communicating groove arranged to join the through hole and the circuit board to each other. The at least one lead wire of the coils is arranged to pass inside the through hole and the communicating groove to be electrically connected to the circuit board. The through hole is sealed with a sealant.10-13-2011
20110255191DISK DRIVE DEVICE - A disk drive device includes a base member; a hub on which a recording disk is placed; a bearing unit arranged on the base member for rotatably supporting the hub; and a spindle drive unit for rotationally driving the hub, wherein the spindle drive unit includes a stator core having salient poles, a coil wound around each of the salient poles, and a magnet having a plurality of magnetic poles arranged in a circumferential direction opposed to the salient poles, the hub includes an outer cylindrical portion formed of a magnetic material and engaged with an inner periphery of the recording disk, and an inner cylindrical portion fixing an outer periphery of the magnet, the number of magnetic poles is an even number in a range of 10 to 16, and the number of salient poles is a multiple of 3 in a range of 12 to 24.10-20-2011
20100097719CLAMP OF DISK ROTATION DRIVER - A disc can be supported stably and surely. The clamp (04-22-2010
20100014190RECORDING MEDIUM DRIVE - According to one embodiment, a recording medium drive includes a stator, a rotor, recording disks, an annular spacer, and an annular thin plate. The rotor is rotatably supported by the stator. The recording disks are mounted on the rotor. The annular spacer is mounted on the rotor between the recording disks. The annular thin plate is mounted on the rotor between one of the recording disks and the annular spacer. The thin plate includes a first thin plate, a second thin plate, and a viscoelastic body. The first and second thin plates are formed of a hard resin plate or a metal plate. The first thin plate is adjacent to either the one of the recording disks or the annular spacer, and the second thin plate is adjacent to the other. The viscoelastic body is interposed between the first thin plate and the second thin plate.01-21-2010
20120200957SPINDLE MOTOR, DISK DRIVE APPARATUS, AND METHOD OF MANUFACTURING SPINDLE MOTOR - In a spindle motor, a lead wire extending from a coil includes a first solder portion coated with a first solder. The lead wire is arranged to extend downward through a base hole portion and a board hole portion. The first solder portion is soldered to a circuit board through a second solder portion. An upper end portion of the first solder portion is arranged above an upper surface of the circuit board such that d08-09-2012
20090021859Overmolded motor hub - Accurately formed critical tolerance fit components are provided for fluid dynamic bearing motors, including disc drive memory systems. In an aspect, critical tolerance fit components are molded to a metal insert and include a portion of a hub, a disc seating surface, and a disc locating surface. The insert includes another portion of a hub, a sleeve, or a disc clamp retainer for a novel disc clamp. In an aspect, the plastic component is situated to cause the thermal expansion of the plastic to be restricted by the thermal expansion of a metal insert. Expensive machining of a stamped metal hub is minimized or eliminated by using the molded component portions. Strict component tolerances are provided as needed for perpendicularity relative to motor rotation for seating a disc with accurate flatness, a circumferential surface for centering the disc, and tight parallelism between a disc mounting surface and a center shaft.01-22-2009
20120243121DISK DRIVE HAVING A DISK CLAMP WITH OPENINGS DIRECTLY RADIALLY OUTBOARD OF FASTENERS - A disk drive includes a spindle motor attached to a disk drive base. The spindle motor includes a hub that rotates about a spindle rotation axis. An annular disk is mounted on the hub. A clamp contacts a top surface of the hub. The clamp includes first and second pluralities of openings therethrough. The clamp is attached to the hub by a plurality of fasteners, each of the plurality of fasteners passing through one of the first plurality of openings. Each of the second plurality of openings has a closed outer periphery within the clamp. Each of the first plurality of openings is disposed directly between the spindle rotation axis and a corresponding one of the second plurality of openings.09-27-2012
20120063030FLUID DYNAMIC BEARING APPARATUS, SPINDLE MOTOR, AND DISK DRIVE APPARATUS - In a fluid dynamic bearing apparatus, an oil buffer is defined between a thrust gap and a pumping gap. The oil buffer has an axial dimension greater than that of the thrust gap, and/or has a radial dimension greater than that of the pumping gap. An air bubble generated in the thrust gap due to cavitation, for example, when a fluid dynamic bearing apparatus experiences a vibration can be dissolved in lubricating oil provided within the oil buffer. This prevents leakage of the lubricating oil due to the air bubble residing in the fluid dynamic bearing apparatus.03-15-2012
20110134566SPINDLE MOTOR AND DISK DRIVE APPARATUS - A stationary portion of a spindle motor includes a base member and a magnetic member. The magnetic member is arranged below a magnet and fixed to the base member. The magnetic member includes an annular plate portion arranged on an upper surface of the base member, and a projecting portion arranged to extend from the plate portion in an axial direction. At least a portion of the projecting portion is press fitted to a wall surface of the base member.06-09-2011
20110216442SPINDLE MOTOR AND DISK DRIVE APPARATUS PROVIDED WITH THE SPINDLE MOTOR - A spindle motor includes a rotary unit, a bearing mechanism, a stator, a base member, and a connector connected to a leader line extending from the stator through a communication hole of the base member. The connector includes a pedestal and a metal pin. The leader line is connected to a first pin terminal of the metal pin on a hole-positioning lower surface of a hole-defining portion of the pedestal. An upper surface of the metal pin is separated from the pedestal at a specified separation position between the first pin terminal and a second pin terminal. A connection position of the first pin terminal and the leader line on the hole-positioning lower surface is covered with an adhesive agent. The periphery of a gap between the metal pin and the pedestal over an extent from the first pin terminal to the separation position is sealed by the adhesive agent.09-08-2011
20120033329SPINDLE MOTOR AND STORAGE DISK DRIVE - In a motor, an annular radially extending gap is defined between an outer annular surface and a lower surface of an annular cover portion. The radially extending gap has an axial width smaller than a maximum width of an upper seal portion defined between an outer circumferential surface of an upper thrust portion and an inner circumferential surface of a tubular portion. An annular axially extending gap is defined between an inner cylindrical surface and a radially inner edge of the annular cover portion. The axially extending gap has a radial width smaller than the maximum width of the upper seal portion.02-09-2012
20110304938Rolling bearing, bearing device and information recording and reproducing device - A rolling bearing provided with a shield plate which hardly induces the irregular deformation of an outer ring without increasing a cost is provided. A rolling bearing includes an inner ring and an outer ring; a plurality of rolling bodies which are held between the inner ring and the outer ring in a rotatable manner; and an annular shield plate which is engageable with an engaging groove portion which is formed on an inner peripheral surface of the outer ring along the circumferential direction and opens toward an inner peripheral surface side and an open end side. The shield plate includes: an annular shield body; and a plurality of engaging projections which are arranged along the outer peripheral portion of the shield body, project outwardly in the radial direction from the outer peripheral portion in an inclined state, and are engageable with the engaging groove portion. The engaging projection is deformable by bending in the orthogonal direction orthogonal to the in-plane direction of the shield body using a connecting portion of the engaging projection connected with the outer peripheral portion of the shield body as a start point, and is formed such that a projecting length of the engaging projection from the outer peripheral portion at both end portions in the circumferential direction is set shorter than the projecting length of the engaging projection from the outer peripheral portion at a center portion in the circumferential direction.12-15-2011
20110304937Motor and recording disc drive apparatus - Disclosed are a motor and a recording disc drive apparatus that can prevent a fluid in a fluid dynamic bearing from being discharged to the outside. A motor according to an aspect of the invention may include: a shaft; a sleeve having a cylindrical shape and supporting the shaft such that the shaft is rotatable therein; a rotor case engaged with an upper end of the shaft and having a rotor main wall having a cylindrical shape and protruding from one surface thereof in order to receive part of the sleeve; and a cover engaged with an end portion of the rotor main wall and extending the rotor main wall, wherein at least two sealing portions preventing leaks of a fluid used to lubricate the sleeve are formed between an internal circumferential surface, defined by the rotor main wall and the cover, and an outer circumferential surface of the sleeve.12-15-2011
20110317309SUSPENSION ASSEMBLY HAVING A MICROACTUATOR BONDED TO A FLEXURE - Disclosed is a suspension assembly for a disk drive that includes: a mounting plate having a top-side and a bottom-side; a microactuator mounting structure formed in the mounting plate; a microactuator mounted in the microactuator mounting structure in which the microactuator has a top-side and a bottom-side; and a flexure attached to the bottom-side of the of mounting plate and the microactuator. The flexure includes a pad layer and a through-hole, in which the through-hole extends through the pad layer. An epoxy on the pad layer bonds widely to the microactuator and extends through the through-hole.12-29-2011
20110317310Base structure for device and hard disk drive having the same - There are provided a base structure for a device such as a hard disk drive and a hard disk drive having the same. The base structure includes: a base body including components mounted thereon and made of a non-aluminum material; and a base reinforcing part attached to the base body as an additional piece. More specifically, the base body is provided by press-molding a steel sheet and the base reinforcing part is provided by press-molding a steel sheet or is provided as a reinforcing plate separately attached to an outer surface of the base body, and the base structure further includes a reinforcing part processing member additionally provided in the reinforcing plate. The base structure for a device such as a hard disk drive and the like, in which the rigidity thereof is secured or the weight thereof is reduced by using various base reinforcing parts and reinforcing part processing members while the manufacturing costs of the base structure are reduced.12-29-2011
20120063029MOTOR AND DISK DRIVE APPARATUS - Inner circumferential surfaces of a rotor holder and a turntable are in contact with an outer circumferential surface of a shaft. This stabilizes coaxiality of both the rotor holder and the turntable with respect to the shaft. An upper cover portion of the rotor holder includes fixing holes. The turntable includes fixing projections arranged to extend through the fixing holes to be in contact with a lower surface of the upper cover portion. A base end portion of each fixing projection is arranged at a level higher than that of an upper end portion of a corresponding one of the fixing holes. Therefore, even if dimensional errors of the rotor holder and the turntable cause a radial displacement between any fixing projection and a corresponding one of the fixing holes, the rotor holder and the turntable can be fixed to each other while maintaining coaxiality therebetween.03-15-2012
20120300346MOTOR AND RECORDING DISK DRIVING DEVICE HAVING THE SAME - There is provided a motor including: a rotating member rotating together with a shaft and including an extension part extended along an outer surface of the shaft; a fixed member including a shaft support part supporting the shaft and an extension part support part supporting the extension part; and an oil storage part disposed between a lower surface of the extension part and the fixed member to thereby provide an oil storage space.11-29-2012
20120250183MOTOR AND STORAGE DISK DRIVE - A motor includes a stationary portion and a rotating portion. The rotating portion includes a sleeve portion including one communicating hole arranged to extend completely there through from an upper surface to a lower surface thereof, and a cover portion including a hole portion. The axial extension range of the hole portion is arranged to overlap with the axial extension range of the communicating hole in a radial direction. A center of the hole portion is arranged on a plane including a central axis and a center of the communicating hole. The communicating hole and the hole portion are arranged on opposite sides of the central axis. The following inequality is satisfied: V10-04-2012
20120250184HOUSING MEMBER FOR USE IN DISK DRIVE APPARATUS, MOTOR UNIT, DISK DRIVE APPARATUS, AND METHOD OF MANUFACTURING HOUSING MEMBER - A housing member for use in a disk drive apparatus includes a rectangular bottom portion and a side wall portion arranged to extend upward from an outer circumferential portion of the bottom portion. The side wall portion includes four outside surfaces including a first outside surface and a second outside surface perpendicular or substantially perpendicular to the first outside surface. The first outside surface includes a first cutting base region. The second outside surface includes a second cutting base region. The bottom portion includes a bearing fixing portion arranged to fix a bearing mechanism of a motor arranged to rotate a disk.10-04-2012
20120134046MAGNETIC HEAD AND DISK DRIVE WITH THE SAME - According to one embodiment, a magnetic head includes a main pole configured to apply a recording magnetic field, a return pole opposed to a trailing side of the main pole across a write gap and configured to return magnetic flux from the main pole, a coil configured to excite magnetic flux in the main pole, a spin-torque oscillator located between respective facing surfaces of the return pole and an end portion of the main pole on the recording-medium side and configured to produce a high-frequency magnetic field, a current source configured to apply current to the spin-torque oscillator through the return and main poles, and a nonmagnetic layer provided in at least one of the poles and extending from a facing surface of the at least one of the poles, which faces the spin-torque oscillator, in a direction across the facing surface.05-31-2012
20120134047HEAD GIMBAL ASSEMBLY AND DISK DRIVE WITH THE SAME - According to one embodiment, a head gimbal assembly includes a suspension, a head, and a conductor trace on the suspension, including one end portion electrically connected to the head and the other end portion includes a terminal area. The conductor trace includes a thin metal plate, a base insulating layer on the thin metal plate, a trace pattern on the base insulating layer, including a plurality of conductors and a plurality of first and second connection terminals continuous with the conductors, and a cover insulating layer on the base insulating layer, configured to cover the trace pattern. The terminal area includes an opening including two opposite side edges, the first connection terminals extend into the opening from one of the side edges thereof, and the second connection terminals extend into the opening from the other side edge thereof.05-31-2012
20120170150Suspension with supporting pieces, head gimbal assembly and disk drive unit with the same - A suspension for a HGA comprises a flexure having a suspension tongue arranged for supporting a slider, which comprising a stainless steel layer and a dielectric layer formed thereon. The dielectric layer has a top surface and bottom surface, a plurality of bonding pads are formed on the top surface at a leading portion of the suspension tongue and arranged for connecting with the slider, and at least two separate supporting pieces are formed on the bottom surface and located at a corresponding position with the bonding pads, thereby releasing stress generated on the bonding pads. The invention also discloses a HGA and a disk drive unit with the same. The invention can release the stress generated on the bonding pads of the suspension, reduce the temperature impact to the suspension, and in turn, reduce thermal crown change of the slider, thereby improving the reading and writing performance.07-05-2012
20120250185ELECTRONIC COMPONENT CONTAINER AND ELECTRONIC DEVICE - An electronic component container includes an electronic component; a holder including a holder base part and ribs standing on the holder base part to form a container of the electronic component; and a supporting plate including a supporting plate base part and fixed to the holder. Further, the holder further includes latch protrusions protruding from the ribs above the holder base part; the supporting plate includes cutout sections so as to avoid interference with the latch protrusions when the supporting plate base part is first placed on the holder base part at a mounting position; and the supporting plate base part is latched between the latch protrusions and the holder base part.10-04-2012
20120262820MAGNETIC HEAD, HEAD GIMBAL ASSEMBLY WITH THE SAME, AND DISK DRIVE - According to one embodiment, a magnetic head includes a main pole configured to apply a recording magnetic field to a recording layer of a recording medium, a return pole opposed to the main pole with a write gap therebetween, and a high-frequency oscillator between respective facing surfaces of the main pole and the return pole and configured to produce a high-frequency magnetic field. At least one of the main and return poles faces the high-frequency oscillator and includes a laminated structure portion includes a magnetic layer and a nonmagnetic layer laminated to one another.10-18-2012
20120262821MAGNETIC RECORDING HEAD, HEAD GIMBAL ASSEMBLY WITH THE SAME, AND DISK DRIVE - According to one embodiment, a magnetic recording head includes a main pole configured to apply a recording magnetic field perpendicular to a recording medium, a trailing-shield pole opposed to the main pole with a recording gap therebetween, a high-frequency oscillator between the main pole and the trailing-shield pole in the recording gap, configured to produce a high-frequency magnetic field, a magnetic seed layer between the main pole and the high-frequency oscillator and in contact with the main pole, and a highly oriented magnetic layer of a soft magnetic material superposed on the magnetic seed layer between the main pole and the high-frequency oscillator and in contact with the high-frequency oscillator.10-18-2012
20120262822DISK DRIVE DEVICE PROVIDED WITH FLUID DYNAMIC BEARING - A sleeve supports a shaft. A housing member is arranged so as to surround the sleeve and make the end of the sleeve protrude. A base member holds the housing member and fixes a stator core so as to surround the housing member. A hub drives a recording disk by being rotated integrally with the shaft, with a magnet being fixed to an annular portion concentric with the shaft so as to face the stator core fixed to the base member. A thrust member is rotated integrally with the hub, and a descender portion and a ring portion.10-18-2012
20110122530SPINDLE MOTOR AND DISK DRIVE APPARATUS - A stator portion of a spindle motor includes a substantially cup-shaped base member including a bottom portion expanding in a radial direction, and a wall portion extending upwards from an outer edge portion of the bottom portion. A circuit board is fixed to a lower surface of the base member in a position on the outer side in the radial direction and on the upper side than the bottom portion. Accordingly, the thickness of the spindle motor in the axial direction can be reduced. The base member has a through hole formed axially through the bottom portion. An opening edge portion of the base member is covered with the insulating layer. A conducting wire from a coil is drawn through the through hole, led out along the surface of the insulating layer, and connected to the circuit board positioned on the outer side in the radial direction than the bottom portion. Accordingly, the conducting wire can be led to the circuit board while the electric connection between the conducting wire and the opening edge portion can be prevented.05-26-2011
20120087039MAGNETIC RECORDING MEDIUM, METHOD OF MANUFACTURING THE SAME, AND MAGNETIC RECORDING/REPRODUCTION APPARATUS - According to one embodiment, a magnetic recording medium includes a substrate, and a magnetic recording layer formed on the substrate. The magnetic recording layer includes recording portions having patterns regularly arranged in an longitudinal direction and containing cobalt and platinum, and non recording portions formed between the recording portions and containing boron and at least one light rare earth metal selected from the group consisting of yttrium, lanthanum, and cerium.04-12-2012
20120327534METHOD OF MANUFACTURING FLUID DYNAMIC BEARING MECHANISM, MOTOR, AND STORAGE DISK DRIVE - A method of manufacturing a bearing mechanism of a motor includes steps a)-e). In step a), a bearing assembly is assembled. In step b), an upper seal gap between an upper thrust portion and an upper hub annular portion is arranged to face downward to increase the width of a gap between an outer tubular portion and a flange portion, or a lower seal gap between the outer tubular portion and a lower hub annular portion is arranged to face downward to increase the width of a gap between the upper thrust portion and the flange portion. In step c), pressure in all gaps is reduced. In step d), lubricating oil is injected into the upper or lower seal gap which faces upward, and a predetermined time or longer is allowed to pass. In step e), pressure is returned to atmospheric pressure.12-27-2012
20100085662METHODS OF MANUFACTURING FLUID-DYNAMIC-PRESSURE BEARING AND SPINDLE MOTOR INCORPORATING THE BEARING, AND SPINDLE MOTOR AND RECORDING-DISK DRIVE INCORPORATING THE BEARING - In spindle motors journaled on fluid-dynamic-pressure bearings, especially in such spindle motors employed in recording-disk drives in implementations that subject the drives to vibration and shock, sealing performance of a capillary seal formed between motor rotor-side and stator-side bearing surfaces, cohesiveness of oil-repellant on rotor-side/stator-side dry-area surfaces adjoining the capillary seal section, and motor inter-component adhesive strength are improved. The capillary-seal-constituting rotor-side/stator-side surface(s) are exposed to a plasma or to ultraviolet rays under predetermined conditions to improve the wettability of the surface(s) for the bearing fluid. The dry-area surface(s) are similarly irradiated so as to improve their wettability for the oil-repellant. Adhesively bonded component surfaces are likewise irradiated so as to improve their wettability for the adhesive, enhancing adhesive strength. Exposed surfaces may be constituted of a synthetic resin to enhance their wettability further, or may be made of metal, to yield a cleaning efficacy from the plasma/UV exposure.04-08-2010
20100085661HYDRODYNAMIC BEARING DEVICE AND DISK ROTATION APPARATUS - In a hydrodynamic bearing device in which a radial bearing face having a dynamic pressure generating groove on a shaft or an inner periphery of a sleeve is provided and a clearance between the shaft and the sleeve is filled with lubricant, an annular depression is provided on one end face of the sleeve adjacent to a rotor hub and a cover plate for covering the depression is attached to the sleeve so as to define a reservoir for the lubricant or air for the purpose of preventing such a risk that absence of an oil film occurs in clearances of a bearing of the hydrodynamic bearing device due to outflow of oil upon forcing of the oil by air received into the bearing. A step portion is provided on the other end face of the sleeve such that the step portion and the reservoir are communicated with each other by a communication hole. During operation of the hydrodynamic bearing device, air in the hydrodynamic bearing device reaches the reservoir via the communication hole so as to be discharged from the reservoir.04-08-2010
20110235210SPINDLE MOTOR INCLUDING COMMUNICATING CHANNEL, AND DISK DRIVE APPARATUS - A spindle motor for use in a disk drive apparatus includes stationary and rotating portions. The stationary portion includes a shaft including a thrust plate. A sleeve portion includes an axial end surface arranged opposite the thrust plate. A first seal member is arranged opposite the thrust plate on an opposite side with respect to the sleeve portion. The thrust plate preferably includes a plate communicating hole arranged to connect first and second thrust gaps defined, respectively, between the thrust plate and the sleeve portion and between the thrust plate and the first seal member. The sleeve portion preferably includes a sleeve communicating hole arranged to connect the first thrust gap with an opposite axial side thereof. A lubricant is arranged to fill a communicating channel extending from a first to a second capillary seal portion through the plate communicating hole and the sleeve communicating hole.09-29-2011
20130148240DISK DRIVE CHARGING CAPACITOR USING MOTOR SUPPLY VOLTAGE DURING POWER FAILURE - A disk drive is disclosed comprising a disk, a spindle motor operable to rotate the disk, a head actuated over the disk, an interface operable to receive a host supply voltage, and a capacitor. The host supply voltage is used to charge the capacitor to a capacitor voltage higher than the host supply voltage. During a power failure, the host supply voltage stops charging the capacitor, and a motor supply voltage is generated from the spindle motor. The capacitor voltage is used to operate control circuitry, and when the capacitor voltage decays below the motor supply voltage, the motor supply voltage charges the capacitor.06-13-2013
20130148241DISK DRIVE DEVICE WITH HUB - The disk drive device includes a base member, a hub, a bearing unit which is arranged on the base member and which rotatably supports the hub, and a spindle drive unit which drives the hub to rotate. The spindle drive unit includes a stator core having a salient pole, a coil wound around the salient pole and a magnet opposed to the salient pole. The hub formed of magnetic material includes an outer cylinder portion engaged with an inner circumference of a recording disk and an inner cylinder portion to which an outer circumference of the magnet is fixed. The diameter of the inner cylinder portion is larger than the diameter of the outer cylinder portion.06-13-2013
20130155547DAMPING MATERIAL TO INCREASE A DAMPING RATIO - A damping material to increase a damping ratio is disclosed. In one embodiment, an actuator arm assembly of a hard-disk drive (HDD) comprises an actuator arm. A viscoelastic layer is coupled with the actuator arm. A constraining layer is coupled with the viscoelastic layer on a side of the viscoelastic layer opposite the actuator arm. The coupling of the actuator arm, the viscoelastic layer, and the constraining layer occurs over an area which is a fraction of the area between the constraining layer and the actuator arm.06-20-2013
20130182351PERPENDICULAR MAGNETIC RECORDING MEDIUM, METHOD OF MANUFACTURING THE SAME, AND MAGNETIC RECORDING/REPRODUCTION APPARATUS - A perpendicular magnetic recording medium according to an embodiment includes a substrate and perpendicular magnetic recording layer. The perpendicular magnetic recording layer includes a recording portion and non-recording portion. The recording portion has patterns regularly arranged in the longitudinal direction, and includes magnetic layers containing Fe or Co and Pt as main components, and at least one additive component selected from Ti, Si, Al, and W. The non-recording portion includes oxide layers formed by oxidizing the side surfaces of the magnetic layers, and nonmagnetic layers formed between the oxide layers.07-18-2013
20130188280DISK DRIVE - According to one embodiment, a disk drive includes a case including a base with a bottom wall, a drive motor on the bottom wall of the base, a plurality of disk recording mediums rotatable by the drive motor, a magnetic head configured to perform data processing on the recording mediums, a carriage on the bottom wall of the base, configured to support the magnetic head for movement relative to the recording mediums, a drive section including a yoke and a magnet on the bottom wall of the base and configured to drive the carriage, and a spoiler including a main body, which includes a magnetic shield member between the yoke and the recording mediums, and a baffle plate extending from the main body and between the adjacent disk recording mediums.07-25-2013
20120002323METHOD FOR INSPECTION OF MAGNETIC RECORDING MEDIUM, MAGNETIC RECORDING MEDIUM, AND MAGNETIC RECORDING/REPRODUCING DEVICE - Disclosed is a method for inspecting a magnetic recording medium in which the adhesion (transfer) of contaminants or corrosive materials to a magnetic head can be prevented. Specifically disclosed is a method for inspecting a magnetic recording medium including a non-magnetic substrate and additionally comprising at least a magnetic layer, a protective layer and a lubricant layer all provided on the non-magnetic substrate. The method is characterized by including exposing the magnetic recording medium to an atmosphere containing a siloxane and determining the resistance of the magnetic recording medium against environmental substances based on the amount of the siloxane attached to the surface of the magnetic recording medium.01-05-2012
20120002322HEAD GIMBAL ASSEMBLY AND DISK DRIVE WITH THE SAME - According to one embodiment, a head gimbal assembly includes a load beam, a metal plate mounted on the load beam and constituting a gimbal includes a limiter portion, a flexure includes a plurality of conductors formed over the metal plate with an insulating layer therebetween, a slider includes a head and mounted on the gimbal, and a positioning reference mark formed on the limiter portion by parts of the conductors and configured to position the slider. The plurality of conductors includes conductors which conduct to the positioning reference mark through the metal plate and constitute an interleaved structure.01-05-2012
20130194701MOTOR AND DISK DRIVE APPARATUS - A spindle motor, which is for use in a disk drive apparatus which includes a housing including a base member and a cover member, includes a stationary portion and a rotating portion. The stationary portion includes a stationary shaft and the base member. The rotating portion includes a sleeve portion. The stationary shaft is inserted into the bearing hole. The stationary shaft includes an annular surface arranged to come into direct or indirect contact with the cover member, the annular surface being located higher than the sleeve portion and extending in a circumferential direction, and an upper protrusion arranged to be fixed to a cover inner circumferential surface defining a cover penetrating hole of the cover member, the upper protrusion protruding upward from the radial inner side of the annular surface. The base member includes a fixing portion arranged to directly or indirectly fix the cover member.08-01-2013
20120069468MAGNETIC RECORDING MEDIUM, METHOD OF MANUFACTURING THE SAME, AND MAGNETIC RECORDING APPARATUS - According to one embodiment, in a method of manufacturing a magnetic recording medium which is configured such that a ferromagnetic recording part is formed on a substrate in a desired track pattern or a desired bit pattern, a ferromagnetic film is formed on the substrate, and then a mask is formed on the ferromagnetic film, the mask having an opening above a region for isolating the ferromagnetic film between tracks or bits. Subsequently, a B-based gas is radiated on the region of the ferromagnetic film through the opening of the mask, thereby increasing a B content of the region to nonmagnetize the region.03-22-2012
20120300345VOICE COIL MOTOR AND DISK DRIVE UNIT WITH THE SAME - A voice coil motor for a disk drive unit includes an external magnet and an actuator coil movably located above the external magnet. The external magnet has a main body with a magnetic north pole, a magnetic south pole and a transition surface therebetween, and further has a protrusion extending from the center part of the main body for increasing torque force, thereby improving the performance of the voice coil motor. The invention also discloses a disk drive unit including the same.11-29-2012
20120075746BASE UNIT FOR USE IN STORAGE DISK DRIVE APPARATUS, SPINDLE MOTOR INCLUDING THE BASE UNIT, AND STORAGE DISK DRIVE APPARATUS INCLUDING THE SPINDLE MOTOR - A base unit for use in a storage disk drive apparatus includes a base portion; a stator core including a plurality of teeth; U-phase, V-phase, and W-phase coils; U-phase, V-phase, and W-phase common wires; and a circuit board. The U-phase, V-phase, and W-phase coils are wound on the teeth and arranged to define a U phase, a V phase, and a W phase, respectively. The U-phase, V-phase, and W-phase common wires are arranged to define the U phase, the V phase, and the W phase, respectively. Each of the U-phase, V-phase, and W-phase common wires is arranged to pass through a separate one of through holes to be drawn out beyond a lower surface of the base portion and electrically connected to the circuit board. Each of the through holes is sealed with a sealant such that the base unit is airtight.03-29-2012

Patent applications in class Rotational drive detail

Patent applications in all subclasses Rotational drive detail