Entries |
Document | Title | Date |
20080273263 | LUBRICATED 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 |
20080278850 | MOTOR - 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 |
20080291569 | Base 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 |
20090021859 | Overmolded 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 |
20090034118 | FLUID 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 |
20090103207 | ROTOR 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 |
20090141395 | MOUNTING 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 |
20090154008 | SPINDLE 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 |
20090161252 | DISK 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 |
20090161253 | BEARING 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 |
20090190253 | Motor 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 |
20090231754 | FLUID 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 |
20090284866 | FLUID 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 |
20100014190 | RECORDING 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 |
20100033870 | FLUID 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 |
20100053806 | DISC DRIVE APPARATUS - A disc drive apparatus comprises: a spindle motor | 03-04-2010 |
20100053807 | LUBRICATED 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 |
20100085661 | HYDRODYNAMIC 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 |
20100085662 | METHODS 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 |
20100097719 | CLAMP OF DISK ROTATION DRIVER - A disc can be supported stably and surely. The clamp ( | 04-22-2010 |
20100142087 | Variable 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 |
20100202084 | DISK DRIVE DEVICE - In a brushless motor, the rotational frequency N (Hz) of the hub satisfies N08-12-2010 | |
20100238590 | DISK 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 |
20100277831 | FLUID 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 R | 11-04-2010 |
20110032639 | ELECTROSTATIC 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 |
20110122529 | SPINDLE 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 |
20110122530 | SPINDLE 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 |
20110134566 | SPINDLE 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 |
20110199705 | DISK 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 |
20110216442 | SPINDLE 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 |
20110235210 | SPINDLE 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 |
20110242701 | MAGNETIC 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 |
20110249362 | SPINDLE 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 |
20110255191 | DISK 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 |
20110279925 | ROTATING 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 |
20110292543 | HEAD 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 |
20110299193 | FLUID 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 |
20110304937 | Motor 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 |
20110304938 | Rolling 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 |
20110317309 | SUSPENSION 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 |
20110317310 | Base 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 |
20120002322 | HEAD 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 |
20120002323 | METHOD 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 |
20120033324 | ROTATING 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 |
20120033325 | SPINDLE 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 |
20120033326 | SPINDLE 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 |
20120033327 | SPINDLE 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 |
20120033328 | SPINDLE 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 |
20120033329 | SPINDLE 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 |
20120033330 | SPINDLE 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 |
20120063029 | MOTOR 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 |
20120063030 | FLUID 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 |
20120069467 | MAGNETIC 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 drive | 03-22-2012 |
20120069468 | MAGNETIC 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 |
20120075746 | BASE 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 |
20120087039 | MAGNETIC 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 |
20120134046 | MAGNETIC 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 |
20120134047 | HEAD 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 |
20120162820 | SPINDLE 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 |
20120170149 | SPINDLE 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 |
20120170150 | Suspension 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 |
20120182644 | RECORDING 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 |
20120182645 | ROTATING 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 |
20120200957 | SPINDLE 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 d | 08-09-2012 |
20120243121 | DISK 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 |
20120250183 | MOTOR 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: V | 10-04-2012 |
20120250184 | HOUSING 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 |
20120250185 | ELECTRONIC 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 |
20120262820 | MAGNETIC 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 |
20120262821 | MAGNETIC 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 |
20120262822 | DISK 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 |
20120262823 | DISK 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 |
20120287534 | Reader 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 |
20120300345 | VOICE 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 |
20120300346 | MOTOR 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 |
20120327534 | METHOD 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 |
20130003223 | BEARING APPARATUS, SPINDLE MOTOR, AND DISK DRIVE APPARATUS - In a bearing apparatus, a first cup portion defining a portion of a stationary portion of a bearing apparatus includes a circular plate portion and a cylindrical portion projecting downward from an outer edge portion of the circular plate portion. A rotating portion of the bearing apparatus includes an annular recessed portion arranged to accommodate at least a lower end portion of the cylindrical portion. Accordingly, it is possible to limit the axial dimension of the bearing apparatus while also enabling a radial dynamic pressure groove array. Additionally, one end of a through hole defined in the rotating portion is arranged to open into the annular recessed portion. | 01-03-2013 |
20130027807 | ROTATING 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 |
20130038964 | SPINDLE 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 |
20130050871 | SPINDLE 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 |
20130050872 | MOTOR 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 |
20130063839 | HEAD-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 |
20130070369 | SUSPENSION 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 |
20130077190 | BEARING 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 |
20130083426 | MOTOR 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 |
20130083427 | MOTOR 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 |
20130135771 | SHROUD 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 |
20130148240 | DISK 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 |
20130148241 | DISK 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 |
20130155547 | DAMPING 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 |
20130163116 | SPINDLE 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 |
20130182351 | PERPENDICULAR 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 |
20130188280 | DISK 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 |
20130194701 | MOTOR 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 |
20130215531 | DISK 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 |
20130222947 | REMOVABLE COVER ASSEMBLY FOR A DATA STORAGE DEVICE - A removable cover assembly for a data storage device comprises a first cover coupled with a casing base of a data storage device via a plurality of screws. A second cover is disposed upon a rib of the casing base and is coupled with the rib. The second cover is configured with a groove which delineates a perimeter separating an interior region of the second cover from an exterior region of the second cover. A space between the first cover and the casing base is filled with a low-density gas. The groove defines the region in the second cover in which separation of the interior region from the exterior region is to occur to expose the screws. | 08-29-2013 |
20130235489 | ROTATING DEVICE, MANUFACTURING METHOD THEREOF AND BEARING COMPONENT - An example rotating device is a disk drive device that includes a base, a hub on which a recording disk is to be mounted and which rotates relative to the base, and a fluid dynamic bearing unit that allows the hub to rotate relative to the base. The fluid dynamic bearing unit includes a shaft that performs relative rotation and a cylindrical member that encircles the shaft, the cylindrical member includes a thrust dynamic pressure generating groove which is provided in one end face of the cylindrical member and which generates thrust dynamic pressure, and the thrust dynamic pressure generating groove includes a cut-and-machined face. | 09-12-2013 |
20130242429 | MOTOR AND DISK DRIVE APPARATUS - A motor includes a shaft component including an inner shaft portion and an outer shaft portion. A radial gap is defined between a sleeve portion and the outer shaft portion. A radial dynamic pressure generating groove array is arranged on at least one surface of an inner circumferential surface of the sleeve portion and an outer circumferential surface of the outer shaft portion, which define the radial gap. The radial dynamic pressure generating groove array includes an upper and lower radial dynamic pressure generating groove array. The inner shaft portion is fixed to the outer shaft portion in an interference fit. An axial range of a fixing region of the inner shaft portion and the outer shaft portion which is in the interference fit is included in a range between the upper and lower radial dynamic pressure generating groove array. | 09-19-2013 |
20130250453 | PERPENDICULAR MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING/REPRODUCTION APPARATUS - According to one embodiment, a perpendicular magnetic recording medium including a soft magnetic under layer, a nonmagnetic seed layer consisting of AgGe, a nonmagnetic interlayer made of Ru or an Ru alloy, and a perpendicular magnetic recording layer, laminated on the nonmagnetic substrate is provided. The nonmagnetic seed layer is an layer containing Ag grains having an fcc structure and an amorphous Ge grain boundary, and the Ag grain surface is higher than the Ge grain boundary surface. | 09-26-2013 |
20130258522 | BRUSHLESS MOTOR, DISK DRIVE APPARATUS, AND METHOD OF MANUFACTURING THE BRUSHLESS MOTOR - A stationary unit of a brushless motor includes a flat armature and a base member arranged to support the armature. The armature includes a power supply portion to which a lead wire is connected. The base member includes a wall portion and a window portion. The wall portion is radially opposed to an outer edge portion of the armature. The window portion is positioned below the power supply portion to axially extend through the base member. An adhesive agent exists between the wall portion and the outer edge portion of the armature. Accordingly, the base member and the armature are strongly fixed to each other. Further, a sealing material is interposed between a whole periphery of an edge of the window portion and the armature, so that the window portion is sealed. (FIG. | 10-03-2013 |
20130271869 | MAGNETIC RECORDING HEAD AND DISK DEVICE INCLUDING THE SAME - A magnetic recording head includes a main magnetic pole generating a recording magnetic field, a trailing shield, a recording coil generating a magnetic field and a high frequency oscillator. The trailing shield includes a magnetic region including a gap side end surface facing a write gap and a nonmagnetic film arranged in the vicinity of the write gap in the trailing shield, and within a plane including track width direction centers of the main magnetic pole and the high frequency oscillator and being perpendicular to a recording layer of a recording medium, a film thickness of the nonmagnetic film along a track moving direction is substantially equivalent to or more than a half of a distance from the gap side end surface to the nonmagnetic film. | 10-17-2013 |
20130271870 | SPINDLE MOTOR AND DISK DRIVE APPARATUS - In a spindle motor, a cup portion of a base member includes a cylindrical portion and a bottom plate portion. The cylindrical portion is concentric or substantially concentric with a central axis extending in a vertical direction. The bottom plate portion closes a bottom portion of the cylindrical portion. The bearing mechanism is accommodated in the cup portion. An adhesive is arranged between an outer circumferential surface of the bearing mechanism and an inner circumferential surface of the cylindrical portion. At least one of the outer circumferential surface of the bearing mechanism and the inner circumferential surface of the cylindrical portion includes an axially extending vertical groove. A communicating hole which is not filled with the adhesive is arranged in at least a portion of an inside of the vertical groove. The communicating hole extends continuously from an upper to a lower end portion of the vertical groove. | 10-17-2013 |
20130271871 | BASE UNIT, SPINDLE MOTOR, AND DISK DRIVE APPARATUS - A base unit includes a base member and a connector. The base member includes a bottom plate portion, a window portion, and a first groove. The first groove is defined in an upper surface of the bottom plate portion around the window portion. The connector includes a board portion and an electrode terminal. The board portion is arranged on the upper surface of the bottom plate portion to cover the window portion and the first groove. The electrode terminal is arranged to overlap with the window portion in the axial direction. An adhesive is arranged between the upper surface of the bottom plate portion and the lower surface of the board portion. The adhesive is arranged to extend continuously in an annular or substantially annular shape around the window portion while being arranged in at least a portion of the first groove. | 10-17-2013 |
20130279044 | THIN FILM PIEZOELECTRIC ELEMENT AND MANUFACTURING METHOD THEREOF, MICRO-ACTUATOR, HEAD GIMBAL ASSEMBLY AND DISK DRIVE UNIT WITH THE SAME - A thin film piezoelectric element of the present invention includes a substrate and a piezoelectric thin film stack formed on the substrate. The piezoelectric thin film stack includes a top electrode layer, a bottom electrode layer and a piezoelectric layer sandwiched between the top electrode layer and the bottom electrode layer, wherein the piezoelectric layer includes a first piezoelectric layer and a second piezoelectric layer whose compositions have different phase structures. The present invention can obtain high piezoelectric constants, enhanced coercive field strength, thereby enabling larger applied field strength without depolarization and achieving a large stroke for its applied device. | 10-24-2013 |
20130301161 | BASE UNIT - A base unit includes a stator, a wiring substrate, and a base portion. The base portion includes a tubular portion, a first recess portion surrounding the tubular portion, and first through-holes arranged within the first recess portion. The wiring substrate includes a connection portion arranged on an upper surface of the base portion and provided with lands, a power feeding portion arranged on a lower surface of the base portion, and an extension portion arranged to interconnect the connection portion and the power feeding portion. A first bonding layer is arranged between the connection portion and a bottom of the first recess portion to bond the connection portion and the bottom of the first recess portion. A second bonding layer is arranged between the power feeding portion and the lower surface of the base portion to bond the power feeding portion and the lower surface of the base portion. | 11-14-2013 |
20130308226 | SPINDLE MOTOR, AND DISK DRIVE APPARATUS INCLUDING THE SPINDLE MOTOR - A spindle motor includes a shaft arranged to extend in an axial direction, and a base portion arranged to define a portion of a housing, and including a through hole in which the shaft is inserted. A fixing region is defined between an inner circumferential portion of the base portion and a lower portion of the shaft. The fixing region includes a press-fitting region and an adhesion region defined on a lower side of the press-fitting region and in which a seal gap is defined between the inner circumferential portion of the base portion and the lower portion of the shaft. The seal gap is arranged to gradually decrease in radial width with increasing height. The seal gap is arranged to include an adhesive arranged therein over an entire circumference thereof. | 11-21-2013 |
20130314818 | RECORDING HEAD AND DISK DEVICE INCLUDING THE SAME - A recording head includes a main magnetic pole generating a recording magnetic field in a direction perpendicular to a recording medium, a write shield magnetic pole facing a trailing side of the main magnetic pole, a recording coil exciting a magnetic flux in a magnetic circuit, and a spin torque oscillator provided between the main magnetic pole and the write shield magnetic pole. The main magnetic pole includes a trailing side end surface that faces the spin torque oscillator and is tilted toward a leading side of the recording head with respect to the direction perpendicular to the recording medium, and the spin torque oscillator has layers with tilted surfaces that are substantially in parallel with the trailing side end surface. | 11-28-2013 |
20130321950 | ASYMMETRIC COMB BORE IN ACTUATOR DESIGN - The present invention generally relates to a head comb for use in a hard disk drive. In one embodiment, the head comb comprises a core body having a bore formed therethrough. The bore is bound by walls having a top extension extending into the opening and a bottom extension extending into the opening. The top extension has a first height, and the bottom extension has a second height that is different than the first height. | 12-05-2013 |
20130321951 | BEARING MECHANISM, MOTOR, AND DISK DRIVE APPARATUS - A bearing mechanism includes a shaft portion, a sleeve portion, a lower opposing portion, a lower outer annular portion, and an upper opposing portion. The sleeve portion includes a sleeve body and a lower thrust plate. A radial dynamic pressure bearing portion is defined in a radial gap. A lower thrust dynamic pressure bearing portion is defined in a lower thrust gap. A lower seal portion is defined in a lower seal gap located between the sleeve portion and the lower outer annular portion. An upper seal portion is defined in an upper seal gap continuous with an upper thrust gap. The sleeve portion includes a first communicating channel in communication with the upper seal gap, and a second communicating channel located between the sleeve body and the lower thrust plate. A lower mouth portion of the first communicating channel axially overlaps the lower thrust dynamic pressure bearing portion. | 12-05-2013 |
20130321952 | BEARING MECHANISM, MOTOR AND DISK DRIVE APPARATUS - A bearing mechanism includes a shaft portion, a sleeve portion, a lower opposing portion, a lower outer ring-shaped portion, and an upper opposing portion. A lower seal portion serving as a pumping seal portion is provided in a lower seal gap between the sleeve portion and the lower outer ring-shaped portion. An upper seal portion is provided in an upper seal gap joined to an upper thrust gap. The lower portion of the sleeve portion includes a large-diameter portion and a small-diameter portion positioned below the large-diameter portion. The sleeve portion includes a communication path joined to the upper seal gap. The communication path includes an opening portion opened in a border between the large-diameter portion and the small-diameter portion. The outer peripheral portion of the lower opposing portion includes an outer periphery protrusion portion radially opposed to the small-diameter portion and axially opposed to the large-diameter portion. | 12-05-2013 |
20130335859 | BASE PLATE, BASE UNIT, MOTOR AND DISK DRIVE APPARATUS - A base plate of a disk drive apparatus includes a motor base disposed around a central axis and a base body portion extending radially outward of the motor base. The motor base is made of a metallic material of a first type. The base body portion is made of a metallic material of a second type. Thus, the axial thickness of a portion of the base plate close to the central axis can be significantly reduced and a reduction in the stiffness of the portion can be prevented. Further, the motor base includes a flange portion and a plastic deforming portion. The flange portion and the plastic deforming portion are respectively in contact with at least a portion of both axial end surfaces of an inner end portion of the base body portion. Thus, extraction of the motor base in the axial direction is prevented. | 12-19-2013 |
20130335860 | BASE PLATE, BASE UNIT, MOTOR, DISK DRIVE APPARATUS AND METHOD OF MANUFACTURING THE BASE PLATE - A base plate of a disk drive apparatus includes a motor base disposed around a central axis and a base body portion extending radially outward of the motor base. The motor base is made of a metallic material of a first type. The base body portion is made of a metallic material of a second type. The base body portion is a casting product in which the motor base is an insert component. An upper protruding portion and a lower protruding portion are defined in one of an outer end portion of a bottom plate portion of the motor base and an inner end portion of the base body portion. | 12-19-2013 |
20130342934 | MOTOR AND DISK DRIVE APPARATUS - A spindle motor arranged to rotate a disk about a center axis extending in an up-down direction includes a rotary unit including a rotor magnet and a stationary unit including a stator opposed to the rotor magnet and a base plate. The base plate includes a flat plate-shaped member positioned around the center axis and made of a first kind of metallic material and a base body axially overlapping with the plate-shaped member and made of a second kind of metallic material. The first kind of metallic material is larger in Young's modulus than the second kind of metallic material. The base body includes a cylindrical or substantially cylindrical bearing attachment portion axially extending about the center axis and a bottom plate portion radially extending from a lower portion of the bearing attachment portion. The plate-shaped member is positioned below the bottom plate portion to contact the bottom plate portion. | 12-26-2013 |
20130342935 | DISK DRIVE DEVICE WITH HUB WITH THINNESS AND SUPPRESSED TORQUE DECREASE - 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. | 12-26-2013 |
20140002924 | MAGNETIC RECORDING HEAD, AND DISK DRIVE COMPRISING THE SAME | 01-02-2014 |
20140002925 | MAGNETIC RECORDING HEAD INCLUDING A HIGH-FREQUENCY OSCILLATOR AND DISK DRIVE WITH THE SAME | 01-02-2014 |
20140002926 | MAGNETIC HEAD POLE INCLUDING LAMINATED STRUCTURE HAVING MAGNETIC AND NONMAGNETIC LAYERS | 01-02-2014 |
20140016228 | Distribution of Mass in Vertical Axis for HGA Flexure Mode Control - Approaches for a hard-disk drive (HDD) and a head gimbal assembly comprising techniques for forming the gimbal legs in a head gimbal assembly (HGA) in a manner to shift the distribution of mass of the HGA that results in controlling the magnitude of resonance gain associated with the HGA during operation of a hard-disk drive. | 01-16-2014 |
20140016229 | SPINDLE MOTOR INCLUDING A FLUID DYNAMIC BEARING AND DISK DRIVE APPARATUS WITH SAME - A stationary portion of a motor includes a shaft component, an upper plate portion, and a lower plate portion. A rotating portion includes a sleeve portion which is disposed between the upper plate portion and the lower plate portion. The shaft component includes an inner shaft upper portion, an inner shaft lower portion which is located in a lower side of the inner shaft upper portion, and an outer shaft portion. The outer shaft portion is located on an outer circumferential surface of the inner shaft upper portion and an outer circumferential surface of the inner shaft lower portion. The inner shaft upper portion and the upper plate portion are preferably defined by a single monolithic member, and the inner shaft lower portion and the lower plate portion are preferably defined by a single monolithic member. | 01-16-2014 |
20140016230 | FLUID DYNAMIC BEARING UNIT AND DISK DRIVE DEVICE INCLUDING THE SAME - A first sleeve rotatably extends around a shaft. First and second flanges are fixed to the shaft. A second sleeve extending around the first sleeve is fixed thereto. A first annular member fixed to the second sleeve surrounds the first flange. A second annular member fixed to the second flange surrounds a portion of the second sleeve. A first capillary seal includes a clearance between the first flange and the first annular member. A second capillary seal includes a clearance between the second annular member and the second sleeve. Lubricant is provided in the clearances in the first and second capillary seals. The second annular member and the second sleeve are designed so that the lubricant in the clearance in the second capillary seal can be viewed from a point in a radial position which is outward of the second sleeve as seen in an axial direction. | 01-16-2014 |
20140022669 | BASE FOR HARD DISK DRIVE, METHOD OF MANUFACTURING THE SAME AND HARD DISK DRIVE HAVING THE SAME - Disclosed herein is a base for a hard disk drive including: a base plate formed with a motor seating part; and at least one through hole formed along an outer circumference of a seating part of the base plate and formed to axially receive a coil winding part of a stator assembly of the motor, wherein the through hole is configured of a first through groove corresponding to the coil winding part and a second through groove extending from the first through groove and formed so that a radial forming width of the second through groove from a center of the seating part is narrower than that of the first through groove. According to the preferred embodiment of the present invention, it is possible to improve and maintain the rigidity of the base while avoiding the coil winding part by structurally changing the through hole of the base. | 01-23-2014 |
20140029137 | MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING/REPRODUCTION APPARATUS USING THE SAME - According to one embodiment, letting (Rf) be main-chain portion C | 01-30-2014 |
20140036389 | SPINDLE MOTOR AND HARD DISK DRIVE INCLUDING THE SAME - There are provided a spindle motor and a hard disk drive including the same, the spindle motor including: a thrust member fixed to a base member; a shaft fixed to the thrust member; a sleeve disposed above the thrust member, rotatably installed with respect to the shaft, and including a catching portion protruding outwardly from a lower portion thereof in a radial direction; a rotor hub coupled to the sleeve and rotating together therewith; and a stopper disposed above the catching portion and fixed to the base member. | 02-06-2014 |
20140036390 | SPINDLE MOTOR AND HARD DISK DRIVE INCLUDING THE SAME - There are provided a spindle motor and a hard disk drive including the same, the spindle motor including: a lower thrust member fixedly attached to a base member; a shaft fixedly attached to the lower thrust member and including an expansion groove formed in an outer peripheral surface thereof in a circumferential direction; a sleeve disposed above the lower thrust member and rotatably attached to the shaft; and a rotor hub coupled to the sleeve and rotating together therewith, wherein the lower thrust member includes a fitting protrusion protruded upwardly from an inner portion thereof in an axial direction and press-fitted into a fixing groove provided in a lower end portion of the shaft upwardly in the axial direction. | 02-06-2014 |
20140036391 | ROTATING DEVICE - A rotating device includes a sleeve which encircles a shaft, a housing which supports the shaft and which forms an annular supporting recess where the lower end of the sleeve enters together with the shaft, a ring member which is provided above the sleeve and which is fixed to the shaft in a manner encircling the shaft. A first gap between the sleeve and the shaft includes first and second radial dynamic pressure generating portions. An annular sleeve recess is formed in upper face of the sleeve. The ring member includes a ring entering portion that enters the sleeve recess in a non-contact manner. An outward gap in the radial direction where the ring entering portion and the sleeve recess face with each other in the radial direction includes a second air-liquid interface of a lubricant. | 02-06-2014 |
20140049856 | SPINDLE MOTOR HAVING A LOW OVERALL HEIGHT - The invention relates to a spindle motor that comprises a stationary motor component having a shaft and an annular stopper part disposed at a free end of the shaft as well as a rotatable motor component that is rotatably supported by means of a fluid dynamic bearing system with respect to the stationary motor component. The rotatable motor component is driven by an electromagnetic drive system. A housing cover covers the spindle motor. The invention is characterized in that the shaft has a step on which a stopper part rests, the end face of the stopper part projecting axially beyond the end face of the shaft, and the housing cover resting only on the end face of the stopper part but not on the end face of the shaft. | 02-20-2014 |
20140063653 | STOPPER, MOTOR, AND DISK DRIVE APPARATUS - A motor includes a stator and a rotor including a disk portion, a cylindrical portion, and a stopper. The stopper includes a stopper protruding portion and is fixed to an inner surface of the cylindrical portion. The cylindrical portion includes a cylindrical portion protruding portion that opposes an outer surface of the stopper. Adhesive is included between the cylindrical portion and the stopper. A gap between an upper end portion of the outer surface of the stopper and an inner peripheral surface of the cylindrical portion protruding portion defines a first tapered gap. A gap between a lower end portion of the outer surface of the stopper and an inner peripheral surface of the cylindrical portion defines a second tapered gap. The adhesive is included in the first tapered gap and the second tapered gap. The stator includes an annular or substantially annular surface below the second tapered gap. | 03-06-2014 |
20140078617 | HYDRODYNAMIC BEARING APPARATUS AND SPINDLE MOTOR AND DISK DRIVE APPARATUS INCLUDING THE SAME - A bearing apparatus includes an upper annular portion that has a circular or substantially circular ring shape, and is arranged to project radially outward from a stationary shaft. One of an upper surface of a sleeve and a lower surface of the upper annular portion includes a first pumping groove array arranged to send a lubricating oil radially inward. The sleeve includes a second inner circumferential surface arranged radially outside of the upper annular portion. One of a lower surface of a cap, an upper surface of the upper annular portion, the second inner circumferential surface, and an outer circumferential surface of the upper annular portion includes a second pumping groove array arranged to send the lubricating oil radially outward or axially downward. | 03-20-2014 |
20140078618 | MAGNETIC RECORDING HEAD AND DISK DRIVE INCLUDING THE SAME - According to one embodiment, a magnetic recording head of a disk drive includes a main pole configured to generate a magnetic field in a direction perpendicular to a recording layer of a recording medium, a write shield magnetic pole opposite to a trailing side of the main pole with a gap, a coil configured to excite a magnetic flux in a magnetic circuit, and a high-frequency oscillator provided between a tip portion of the main pole on a side of the recording medium and the write shield magnetic pole to generate a high-frequency magnetic field. The write shield magnetic pole includes an end face opposite to the high-frequency oscillator and the end face is formed so that a distance from the main pole increases with an increasing distance from the recording medium. | 03-20-2014 |
20140085749 | SPINDLE MOTOR AND DISK DRIVE APPARATUS - A spindle motor includes a stationary portion and a rotating portion. The stationary portion includes a shaft and an upper annular member. The rotating portion includes a sleeve. The shaft includes an annular or substantially annular upper shaft recessed portion recessed radially inward from an outside surface of the shaft. The upper shaft recessed portion is arranged opposite to an inside surface of a hole of the upper annular member. An adhesive is arranged in a gap defined between the upper shaft recessed portion and the inside surface of the hole of the upper annular member. | 03-27-2014 |
20140111884 | SPINDLE MOTOR AND HARD DISK DRIVE THEREWITH - A thin spindle motor having a stator core with sufficient swaging strength even using thin magnetic steel sheets is provided, whereby the magnetic loss and the power consumption of the spindle motor are reduced. The stator core is formed by laminating plural stator laminations with a thickness of 0.1 to 0.2 mm and joined by a swaging portion. The swaging portion has an approximately rectangular shape having long sides extending along a radial direction when viewed from an axial direction. The swaging portion has a cross section with a middle portion parallel to the radial direction and a slope portion at the both sides when viewed from a circumferential direction, thereby forming a recess. The recess has a depth that is less than the thickness of the stator lamination whereby the swaging portion does not cut the stator lamination. | 04-24-2014 |
20140111885 | ROTATING DEVICE - A rotating device is provided with: a hub that is rotatably supported by the base and on which a recording disk is to be mounted; a yoke that is fixedly provided on the hub and is configured to hold a magnet; a bearing unit in which one end thereof is fixedly provided on the base and in which the other end thereof is configured to hold the hub; and a coil that is fixedly provided on the base and is configured to generate electromagnetic interaction with the magnet. The hub has a screw hole in which a screw for fixing a clamper, which is used to fix the recording disk to the hub, to the hub is screwed. The screw hole penetrates the hub. The yoke is configured such that the yoke covers one end of the screw hole. | 04-24-2014 |
20140126085 | BEARING, BEARING DEVICE AND RECORDING DEVICE - A bearing device has two or more bearings each having an inner ring and an outer ring disposed on the same axis. A plurality of rolling elements are arranged in a ring-shaped region between the inner ring and the outer ring with a gap in a circumferential direction, and a plurality of rolling element pockets hold the rolling elements in a rollable manner at regular intervals from one another. A holder having a grease pocket of concave shape is placed between the rolling element pockets and stores grease serving as a lubricant of the rolling elements. The grease consists of at least a base oil comprised of aromatic carbon and a thickener, the content of the aromatic hydrocarbon being 70 weight % or more of the grease. | 05-08-2014 |
20140133051 | CLAMP RING, SPINDLE MOTOR INCLUDING CLAMP RING AND HARD DISK DRIVE INCLUDING SPINDLE MOTOR - There are provided a clamp ring, a spindle motor including the clamp ring and a hard disk drive including the spindle motor. The spindle motor includes: a fixed member; a rotating member rotatably supported by the fixed member using fluid dynamic pressure; and a clamp ring inserted into an outer surface of the rotating member in a radial direction to fix a recording disk. | 05-15-2014 |
20140139947 | SPINDLE MOTOR AND DISK DRIVE APPARATUS - A spindle motor of a disk drive apparatus includes a base unit, a stator core, a covered cylindrical rotor hub, a rotor magnet, and a bearing mechanism. The height of the stator core in an axial direction is about 50% or more and about 70% or less of the height of the stator. A torque constant Kt of torque generated between a stator and a rotor magnet is about 4 mN·m/A or more and about 6 mN·m/A or less. A motor constant Km is about 2 mN·m/(A·√Ω) or more and about 4 mN·m/(A·√Ω) or less. | 05-22-2014 |
20140139948 | STATIONARY AND ROTATABLE COMPONENTS OPERATIONAL WITH FIRST AND SECOND STATORS - A fluid dynamic bearing motor and method are provided for use with various disc drive memory device products differently rated by operational rotational speed. The operational speeds are those speeds measured during reading and writing memory operations to the memory device. In an aspect, the present invention meets full operating requirements, including stiffness and power requirements, at multiple rated speeds for use with either standard or high-end performance disc drive products. Costs associated with a dedicated manufacturing line for high-end products are substantially reduced. A single manufacturing line can serve both standard and high-end disc drive memory device products. The present invention is especially useful in reducing costs of 2.5 inch notebook products that are typically marketed in two levels of performance, namely, 5400 RPM standard performance products and 7200 RPM high performance products. | 05-22-2014 |
20140139949 | ROTATING DEVICE - A rotating device comprises: a hub on which a magnetic recording disk is to be mounted; a base configured to rotatably support the hub via a bearing; a shaft configured such that it extends along the rotational axis of the hub; and a chassis arranged such that it faces the magnetic recording disk, and configured to have a Young's modulus that is smaller than that of the base. A base hole is provided to the upper face of the chassis that faces the magnetic recording disk such that it extends along the rotational axis. Furthermore, the base is fitted into the base hole, thereby fixedly mounting the base on the chassis. | 05-22-2014 |
20140153132 | SPINDLE MOTOR AND DISK DRIVE APPARATUS - A base member of a motor includes a base through-hole extending through a bottom portion thereof. Two or more lead wires extending from coils pass through the base through-hole. Thus, as compared with a case where the lead wires pass through different base through-holes respectively, it is possible to reduce the number of the base through-holes. Accordingly, it is possible to minimize or prevent a reduction in the rigidity of the base member. Insulating sheet portions are arranged on the lower and upper surfaces of the base member. Each insulating sheet portion includes an overhang portion which overlaps with the base through-hole when seen in a plan view. The lead wires extending from the coils are led out toward the lower surface of the base member through holes, cutouts, or slits defined in the overhang portion. This makes it possible to easily distinguish the led-out lead wires from each other. | 06-05-2014 |
20140160595 | EMERGENCY POWER OFF (EPO) ISLAND FOR SAVING CRITICAL DATA TO NON-VOLATILE MEMORY - Approaches for an emergency power off (EPO) power island, for saving critical data to non-volatile memory in the event of an EPO condition, for use in a hard-disk drive (HDD) storage device. The EPO power island includes a controller for detecting an EPO condition. A voltage regulator supplies power from spindle motor back EMF only to the EPO power island and to the non-volatile memory. Thus, the remainder of the hard drive controller (HDC) is isolated from the EPO power island so that it will not corrupt the data as the HDC's power supply is decaying. Using the power provided by the voltage regulator, the EPO power island transfers critical data from a memory internal to the island to a non-volatile memory external to the island, such as to a flash memory chip. | 06-12-2014 |
20140168815 | HEAD GIMBAL ASSEMBLY AND DISK DEVICE WITH THE SAME - According to one embodiment, a head gimbal assembly includes a load beam, a base plate fixed to a proximal-end portion of the load beam, a flexure attached to the load beam and the base plate, a gimbal portion formed of a distal-end portion of the flexure positioned on a distal-end portion of the load beam, a magnetic head attached to the gimbal portion, and electrically connected to the traces of the flexure, a concave portion formed in the gimbal portion, and concaved toward the thin metallic plate side, and a piezoelectric element arranged in the concave portion, fixed on a bottom of the concave portion, and configured to expand/contract in a longitudinal direction of the flexure by application of a voltage thereto. | 06-19-2014 |
20140185162 | BASE ASSEMBLY AND HARD DISK DRIVE INCLUDING THE SAME - There is provided a base assembly including a motor mounting part, and a base body including a disk mounting part coupled to the motor mounting part and having a disk disposed thereon, the disk having data stored therein, and a head seating part formed in a position lower than that of the disk mounting part, wherein the motor mounting part is formed of a non-magnetic material, and the base body is formed of a magnetic material. | 07-03-2014 |
20140185163 | BASE PLATE, AND METHOD OF MANUFACTURING THE SAME AND DISK DRIVE INCLUDING THE SAME - There is provided a base plate including a body part formed of a metal plate, a pocket part including a recess formed in one surface of the body part by decreasing a thickness of the body part, a center plate part forming the pocket part and corresponding to the recess, a pocket periphery part forming the body part in a periphery of the pocket part, and a pocket edge part formed between the pocket periphery part and the center plate part and having a thickness different from that of the center plate part, wherein a height from a bottom surface of the body part to a top surface of the center plate part is identical to a height of the pocket periphery part, and a thickness of the pocket periphery part is greater than a thickness of the center plate part. | 07-03-2014 |
20140192438 | ROTATING DEVICE - A rotating device includes a sleeve which encircles a shaft, a housing which supports the shaft and which forms an annular supporting recess where the lower end of the sleeve enters together with the shaft, a ring member which is provided above the sleeve and which is fixed to the shaft in a manner encircling the shaft. A first gap between the sleeve and the shaft includes first and second radial dynamic pressure generating portions. An annular sleeve recess is formed in upper face of the sleeve. The ring member includes a ring entering portion that enters the sleeve recess in a non-contact manner. An outward gap in the radial direction where the ring entering portion and the sleeve recess face with each other in the radial direction includes a second air-liquid interface of a lubricant. | 07-10-2014 |
20140192439 | MOTOR 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 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 provided. 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. | 07-10-2014 |
20140211342 | SPINDLE MOTOR WITH HYDRODYNAMIC BEARING STRUCTURE HAVING CAPILLARY SEAL AND DISK DRIVE APPARATUS INCLUDING SAME - A lubricating oil is arranged between stationary and rotating portions of a spindle motor. When the motor is stationary, upper and lower surfaces of the lubricating oil are respectively located in upper and lower capillary seal portions. A first angle defined between an outer circumferential surface of the plate portion and an inner circumferential surface of a cylindrical portion at the upper capillary seal portion, and a second angle defined between an outer circumferential surface of a sleeve and an inner circumferential surface of the wall portion at the lower capillary seal portion, in a section taken along a plane including a central axis is respectively in the range of about 1 degree to about 8 degrees and in the range of about 1 degree to about 10 degrees, respectively. The upper capillary seal portion has maximum radial and axial dimensions smaller than those of the lower capillary seal portion. | 07-31-2014 |
20140233133 | SPINDLE MOTOR AND RECORDING DISK DRIVING DEVICE HAVING THE SAME - There is provided a spindle motor including a base member formed by firing processing a steel plate and provided with a cylindrical installation part, a shaft support part including a sleeve insertedly disposed in the installation part, a shaft rotatably supported by the shaft support part, a rotor hub fixed to an upper end of the shaft and provided with a driving magnet, and a stator core installation member disposed on the base member so as to be disposed outwardly of the installation part in a radial direction and having a stator core, wherein the stator core installation member includes a body part, an installation wall part extending from an upper surface of the body part and a support part, and the rotor hub is provided with an extending wall extending from a bottom surface thereof to form a labyrinth seal with the installation wall part. | 08-21-2014 |
20140254046 | DISK DRIVE UNIT - A disk drive unit includes a rotor configured to rotate a disk accommodated within a disk accommodating space and set thereon, a fixed body configured to rotatably support the rotor, a fluid dynamic pressure generating part provided between the fixed body and the rotor, and a plurality of ring-shaped members, provided in an overlapping manner along a direction of a rotational axis of the rotor within a space that communicates the disk accommodating space and a gas-liquid interface of the lubricant, and covering a gap between the rotor and the fixed body. | 09-11-2014 |
20140268411 | MOTOR AND DISK DRIVE APPARATUS - A motor includes a stationary portion and a rotating portion that is rotatable about a central axis extending in a vertical direction with respect to the stationary portion. The stationary portion includes a shaft and a cup portion. The shaft extends in an axial direction and is fixed to the cup portion. The rotating portion includes a sleeve portion including at least a portion thereof arranged inside the cup portion, and is arranged opposite to the shaft. The cup portion includes a cylindrical portion, a bottom plate portion, and a first conical portion. The cylindrical portion is radially opposite to an outer circumferential surface of the sleeve portion. The bottom plate portion is inside the cylindrical portion. The first conical portion extends upward from an inner end portion of the bottom plate portion. | 09-18-2014 |
20140268412 | SPINDLE MOTOR AND HARD DISK DRIVE INCLUDING THE SAME - There is provided a spindle motor, including: a rotating member including a shaft having a fixing groove disposed in a lower portion thereof, a hub base extending from an upper end of the shaft in an outer radial direction, and a magnet support part extending from an outer edge of the hub base downwardly in an axial direction; a sleeve rotatably supporting the rotating member; and a stopper including a fixed part inserted into the fixing groove and a flange part extending from an end of the fixed part in the outer radial direction, wherein the flange part includes a groove part formed by being recessed inwardly and an extension part extending from the groove part in the outer radial direction. | 09-18-2014 |
20140268413 | SPINDLE MOTOR AND HARD DISC DRIVE INCLUDING THE SAME - A spindle motor includes a shaft; a sleeve rotatably supporting the shaft by fluid dynamic pressure; a holder provided outwardly of the sleeve and at least partially formed of a magnetic material; a stator core mounted on an outer surface of the holder; and a base member including a mounting part protruding upwardly in an axial direction and fixed to the holder. The holder has a core seating part protruding outwardly therefrom, and an upper surface of the stator core is seated on the core seating part. | 09-18-2014 |
20140285924 | SPINDLE MOTOR AND RECORDING DISK DRIVING DEVICE INCLUDING THE SAME - There is provided a spindle motor including: a sleeve fixedly installed on the base member and having a circulation hole formed therein; a shaft rotatably inserted into a shaft hole of the sleeve; a rotor hub fixedly installed on an upper end portion of the shaft; and a thrust member installed in an installation groove of the sleeve and forming a connection part while being installed in the installation groove, the connection part being connected to the circulation hole, wherein the connection part is formed by the sleeve and the rotor hub and connects a sealing part in which a liquid-vapor interface is disposed and the circulation hole to each other, and an upper and lower radial dynamic grooves allowing a lubricating fluid to move from a lower end portion of the shaft toward the upper end portion thereof during rotation of the shaft. | 09-25-2014 |
20140293481 | HARD DISK DRIVE - Disclosed herein is a hard disk drive. The hard disk drive according to a preferred embodiment of the present invention includes: at least one disk; a spindle motor rotating the disk; a head stack assembly rotatable to write and read data on and from the disk; a plate-shaped base rotatably supporting the head stack assembly and supporting the spindle motor; and at least one elongated pin disposed on the base. In particular, the base according to the preferred embodiment of the present invention is integrally provided with at least one cylindrical burring part that may receive a part of the pin. | 10-02-2014 |
20140293482 | ROTATING DEVICE - A rotating device includes a rotor on which a magnetic recording disk is to be mounted and a stator configured to rotatably support the rotor. The stator includes a support projection extending along a rotating axis of the rotor, a shaft configured to surround the support projection and fixed to the support projection, a top cover covering the rotor, and a shaft fixing screw configured to fix the top cover to the shaft. The shaft fixing screw enters a shaft fixing screw hole formed in the support projection along the rotating axis. | 10-02-2014 |
20140300993 | MOTOR DRIVE DEVICE, MAGNETIC DISK STORAGE DEVICE, AND ELECTRONIC APPLIANCE - A motor drive device has a motor driver adapted to receive a first power supply voltage to drive a motor; an internal regulator adapted to generate from an input voltage an internal power supply voltage; and a power supply switcher adapted to receive both the first power supply voltage and a second power supply voltage lower than the first power supply voltage to output, as the input voltage, the second power supply voltage when the second power supply voltage is normal and to output, as the input voltage, the first power supply voltage when the second power supply voltage is abnormal. | 10-09-2014 |
20140313613 | Magnetic Write Head Having A Coil Adjacent To The Main Pole - Approaches for a magnetic write head having an adjacent coil architecture, wherein a coil turn is fabricated immediately adjacent to the writer main pole. The adjacent portion essentially lies on the main pole, except for a very thin layer of insulation atomically layered in between. The adjacent coil portion is also substantially closer o the wrap-around shield in comparison with conventional coil configurations. Further, the other upper coil portions may be fabricated to essentially lie on the stitch pole, again except for a very thin atomic layer deposited layer of insulation layered between. This adjacent coil configuration provides a writer coil configuration that concentrates the coil structure significantly closer to the main pole surface, as well as concentrates more of the coil structure closer to the main pole tip, providing for a more efficient and faster write head. | 10-23-2014 |
20140313614 | MAGNETIC WRITE HEAD HAVING A STACKED COIL ARCHITECTURE FOR HIGH DATA RATE PERFORMANCE - Approaches for a magnetic write head having a stacked coil architecture. Embodiments utilize the better process control capability available with thin films' thicknesses, compared to the control capability of vertical gap-filling processes, which provides for better scalability to shorter yoke length magnetic write heads, which are faster at writing data bits than are magnetic write heads having a longer yoke length. | 10-23-2014 |
20140321001 | CURRENT DETECTION CIRCUIT, MOTOR DRIVING DEVICE, MAGNETIC DISK STORAGE DEVICE, AND ELECTRONIC APPLIANCE - A current detection circuit for detecting a maximum current value in a three-phase motor includes an identifier configured to identify a maximum current phase having the maximum current value among phases of the motor, and a detector configured to detects the maximum current value by summing current values of phases other than the maximum current phase when the current direction in the maximum current phase is a predetermined first direction. | 10-30-2014 |
20140334034 | MOTOR AND DISK DRIVE APPARATUS - A motor includes a rotating portion and a stationary portion. The stationary portion includes a shaft component which includes an inner shaft portion and an outer shaft portion, an upper plate portion, and a lower plate portion. The upper plate portion is disposed in one side of the shaft component and extends radially outward from the one side of the shaft component. The lower plate portion is disposed on the other side of the shaft component and extends radially outward from the other side of the shaft component. The rotating portion includes a sleeve portion. The inner shaft portion and the outer shaft portion are fixed by an adhesive. An adhesive retaining portion is provided between an outer peripheral portion of the inner shaft portion and an inner peripheral portion of the outer shaft portion. | 11-13-2014 |
20140334035 | MOTOR AND DISK DRIVE APPARATUS - A motor includes a rotating portion including a sleeve portion and a stationary portion. The stationary portion includes a shaft component which includes an inner shaft portion and an outer shaft portion. A radial dynamic pressure generating groove array is provided on at least one surface of an inner circumferential surface of the sleeve portion and an outer circumferential surface of the outer shaft portion, which define the radial gap. The radial dynamic pressure generating groove array includes an upper radial dynamic pressure generating groove array and a lower radial dynamic pressure generating groove array. A range of a fixing region in an axial direction between the inner shaft portion and the outer shaft portion in an interference fit state is included in a range between the upper radial dynamic pressure generating groove array and the lower radial dynamic pressure generating groove array. | 11-13-2014 |
20140340789 | OPERATIONAL AMPLIFIER, MOTOR DRIVE DEVICE, MAGNETIC DISK STORAGE DEVICE, AND ELECTRONIC APPLIANCE - An operational amplifier has an input stage which generates a first input current and a second input current in accordance with a first input signal and a second input signal, an offset adjuster which gives offsets to the first input current and the second input current respectively to generate a first output current and a second output current, an output stage which generates an output signal in accordance with the first output current and the second output current, and an offset current generator which generates a first offset current and a second offset current in accordance with an offset adjustment signal. The offset adjuster gives the offsets to the first input current and the second input current respectively by using the first offset current and the second offset current. | 11-20-2014 |
20140340790 | ENLARGED SUBSTRATE FOR MAGNETIC RECORDING MEDIUM - An enlarged substrate for a magnetic recording medium used in a data storage device such as a hard disc drive (HDD). In some embodiments, an apparatus includes a substrate for a magnetic recording disc for installation in a 3½ inch form factor hard disc drive, the substrate having an overall diameter of nominally from 96.9 mm to 100.4 mm. In other embodiments, an apparatus comprises a substrate for a magnetic recording disc for installation in a 2½ inch form factor hard disc drive, the substrate having an overall diameter of nominally from 66.9 mm to 71.8 mm. In other embodiments, a data storage device has a magnetic recording medium that uses an enlarged substrate as set forth above. | 11-20-2014 |
20140355154 | DISK DRIVE UNIT - A disk drive unit includes a stationary body; a rotating body rotatably supported on the stationary body, a seal part configured to form a first gas-liquid interface of a lubricant existing in a gap between the stationary body and the rotating body, and a groove-shaped opening opposing the seal part and communicating to the gap via a communication hole. The seal part has a shape such that the gap gradually increases towards an aperture opposing the groove-shaped opening, and the groove-shaped opening has a shape such that the gap gradually increases towards an aperture opposing the seal part. | 12-04-2014 |
20140362468 | MAGNETIC RECORDING HEAD AND DISK DRIVE WITH THE SAME - According to one embodiment, a magnetic recording head of a disk drive includes a main pole configured to produce a recording magnetic field perpendicular to a recording layer of a recording medium, a trailing shield located on the trailing side of the main pole with a write gap therebetween, a recording coil configured to produce a magnetic field in the main pole, and a nonmagnetic film containing a nonmagnetic material with a negative thermal expansion coefficient and disposed in the write gap between the trailing shield and a distal end portion of the main pole. | 12-11-2014 |
20140362469 | SPINDLE MOTOR FOR USE IN DISK DRIVE APPARATUS, DISK DRIVE APPARATUS, AND METHOD OF MANUFACTURING STATOR - A motor includes a base portion including a plurality of base through holes passing there through and a stator arranged on an upper side of the base portion. A plurality of coils of the stator include three coil groups including one or more of the coils defined by a single conducting wire. A joint portion where at least two of three common wires are joined together to define a single common wire is provided on the upper side of the base portion. Each common wire is one end portion of the conducting wire defining a separate one of the three coil groups. Each of the common wire elements and lead wire elements passes through a separate one of the base through holes. Each base through hole includes a circular sealing portion between an inner circumference and an entire circumferential extent of a corresponding one of the wire elements. | 12-11-2014 |
20140362470 | SPINDLE MOTOR FOR USE IN DISK DRIVE APPARATUS, AND DISK DRIVE APPARATUS - A lead wire guide member is made of an electrically insulating material, and arranged to extend along a lower surface of a base portion. A movement restricting portion is arranged in the lower surface of the base portion. Lead wires are arranged to pass through base through holes to reach the lower surface, and extend along the lower surface to be connected to the circuit board. A spindle motor further includes a sealant arranged between an entire circumferential extent of each base through hole and an entire circumferential extent of the corresponding lead wire. The lead wire guide member includes an inner edge and an outer edge. The inner edge is arranged opposite to the lead wires. The outer edge is arranged to at least face radially outward. The movement restricting portion is in contact with the outer edge of the lead wire guide member. | 12-11-2014 |
20140362471 | DISK DRIVE DEVICE WITH HUB WITH THINNESS AND SUPPRESSED TORQUE DECREASE - 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. | 12-11-2014 |
20140368949 | CLASS-AB AMPLIFIER, MOTOR DEVICE, MAGNETIC DISK STORAGE DEVICE, AND ELECTRONIC APPARATUS - A class-AB amplifier has upper side and lower side transistors, a linear driver, upper side and lower side idlers, upper side and lower side detection current generators, and an off driver. The upper side and lower side idlers bias upper side and lower side gate voltages by generating upper side and lower side bias currents so as to turn on the upper side and the lower side transistors at the same time in the crossover region between an input voltage and a reference voltage respectively. The upper side detection current generator and the lower side detection current generator generates upper side and lower side detection currents in accordance with upper side and lower side bias currents respectively. The off driver controls the lower side gate voltage so as to reduce a degree of conduction of the lower side transistor as the upper side detection current is larger, and controls the upper side gate voltage so as to reduce a degree of conduction of the upper side transistor as the lower side detection current is larger. | 12-18-2014 |
20140368950 | SWITCHING REGULATOR, MOTOR DRIVE DEVICE, MAGNETIC DISK STORAGE DEVICE, AND ELECTRONIC APPARATUS - A switching regulator has an output stage which, with an output switch element, an inductor, a rectifying element, and a smoothing element, generates an output voltage from an input voltage, a divided voltage generator which generates a divided voltage from a switch voltage generated at one terminal of the rectifying element, a selector which outputs one of the divided voltage and a fixed voltage in accordance with a switching signal as a select voltage, a zero-cross comparator which monitors the select voltage to generate a zero-cross detection signal, and a controller which generates the switching signal in accordance with the necessity of monitoring the zero-cross of an inductor current and which performs on/off control of the output switch element reflecting the zero-cross detection signal. | 12-18-2014 |
20140368951 | SPINDLE MOTOR AND HARD DISK DRIVE INCLUDING THE SAME - There are provided a spindle motor including a second thrust member installed on a base member; a shaft installed on the second thrust member; a sleeve disposed above the second thrust member and installed to be rotatable with respect to the shaft; a rotor hub coupled to the sleeve; and a first thrust member disposed above the sleeve and installed on the shaft, wherein the sleeve includes a circulation hole penetrating therethrough in an axial direction, the sleeve and the first thrust member include a first thrust bearing formed therebetween and the sleeve and the second thrust member include a second thrust bearing formed therebetween, and an area by which an upper end portion of the circulation hole is overlapped with the first thrust bearing is larger than an area by which a lower end portion of the circulation hole is overlapped with the second thrust bearing. | 12-18-2014 |
20140368952 | SPINDLE MOTOR AND HARD DISK DRIVE INCLUDING THE SAME - There are provided a spindle motor and a hard disk drive including the same. The spindle motor includes: a shaft; a sleeve rotatably supporting the shaft by fluid dynamic pressure; a stator core installed on an outer surface of the sleeve; a base member fixed to the sleeve, wherein at least a portion of an inner edge of the base member in a radial direction is inserted into a fixing portion formed in a circumferential direction in an outer surface of the sleeve in the radial direction, and the sleeve includes a first sleeve supporting the shaft and a second sleeve provided outwardly of the sleeve and having the stator core installed on an outer surface thereof. | 12-18-2014 |
20150015992 | MAGNETIC RECORDING HEAD AND DISK APPARATUS WITH THE SAME - According to one embodiment, a magnetic recording head includes a main pole, a write shield facing the main pole with a write gap interposed therebetween, a recording coil, and a high-frequency oscillator including an oscillation layer provided within the write gap between an end portion of the main pole and the write shield, and an intermediate layer and a spin-injection layer stacked on the oscillation layer. The oscillation layer, the intermediate layer and the spin-injection layer are stacked in a direction intersecting the gap length direction of the write gap, and at least one of the oscillation layer and the spin-injection layer is electrically connected to one of the main pole and the write shield. | 01-15-2015 |
20150015993 | BASE ASSEMBLY, SPINDLE MOTOR AND HARD DISK DRIVE INCLUDING THE SAME - There is provided a base assembly including: a base member formed by performing plastic deformation on a steel sheet to be at least partially bent; and a flexible printed circuit board disposed on a bottom surface of the base member, wherein a surface having the flexible printed circuit board disposed thereon on the bottom surface of the base member is flat. | 01-15-2015 |
20150022919 | SPINDLE MOTOR, DISK DRIVE APPARATUS, AND METHOD OF MANUFACTURING SPINDLE MOTOR - In a method of manufacturing a spindle motor, a sheet preferably made of a thermoplastic resin is closely adhered to an upper surface of a base portion of a spindle motor such that the sheet covers a base hole of the base portion. Next, heat is applied to a region of the sheet which coincides with the base hole to define a sheet hole continuous with the base hole. Thereafter, a coil is arranged over the base portion, and a conducting wire defining the coil is extended through the sheet hole and the base hole to be drawn downwardly out of the base portion. The sheet hole is thus defined after the sheet is closely adhered to the base portion. In addition, the sheet hole is defined by melting the resin through application of the heat. It is therefore easy to arrange the sheet and define the sheet hole. | 01-22-2015 |
20150029614 | DISK DRIVE DEVICE - A disk drive device includes a chassis, a top cover fixed to a chassis, a rotating body on which a disk retained in a disk retaining space formed between the chassis and the top cover is to be mounted, and a bearing body that supports the rotating body in a freely rotatable manner relative to the chassis. The bearing body has a lubricant applied in a predetermined area, and a capturer that captures the vaporized lubricant from the gas-liquid interface is provided in a space in communication with the disk retaining space from the gas-liquid interface of the lubricant. | 01-29-2015 |
20150036240 | HARD DISK DOUBLE LUBRICATION LAYER - Systems and methods are illustrated for manufacturing hard disks with double lubrication layers that allow minimization of a HDD head DFH touchdown point while maintaining good tribology performance for HDD reliability. An exemplary hard disk includes a magnetic recording layer, a carbon overcoat, and a double lubrication layer: a bonded lubrication layer and a mobile lubrication layer. The bonded lubrication layer includes a high conformity and high density first lubricant. The mobile layer include a high lubricity lubricant that promotes HDI reliability. | 02-05-2015 |
20150055246 | SPINDLE MOTOR AND DISK DRIVE APPARATUS - A spindle motor includes an upper bearing portion and a lower bearing portion each of which is inclined with respect to a central axis. The upper bearing portion includes an upper dynamic pressure generating groove defined in at least one of an upper outer circumferential surface of a shaft portion and an upper inner circumferential surface of a sleeve. The lower bearing portion includes a lower dynamic pressure generating groove defined in at least one of a lower outer circumferential surface of the shaft portion and a lower inner circumferential surface of the sleeve. The radial distance between a lower end portion of the upper dynamic pressure generating groove and the central axis is shorter than the radial distance between an upper end portion of the lower dynamic pressure generating groove and the central axis. | 02-26-2015 |
20150055247 | SPINDLE MOTOR, AND DISK DRIVE APPARATUS - A spindle motor includes a stationary portion and a rotating portion. The stationary portion includes a shaft, a first cup portion. The first cup portion includes a circular plate member and an annular member. The rotating portion includes an annular concave portion that accommodates at least a lower end portion of the annular member. A lubricant is interposed in a gap between a surface of a stationary portion and a surface of the rotating portion. The shaft, the rotating portion, and the lubricant define a fluid dynamic pressure bearing. A connection gap that reaches an inner side of the first cup portion from an outer circumferential surface of the first cup portion is configured between the circular plate member and the annular member. At least a portion of the connection gap is filled with an adhesive. | 02-26-2015 |
20150055248 | SPINDLE MOTOR AND DISK DRIVE APPARATUS - A spindle motor includes a recording disk and a clamper. A cylindrical portion includes a first screw portion positioned in an outer circumferential portion of the cylindrical portion. The clamper includes an annular raised portion configured to be fitted in a through hole of the recording disk. An inner circumferential portion of the clamper includes a second screw portion configured to be screwed to the first screw portion. At least a portion of the second screw portion is positioned in an inner circumferential portion of the annular raised portion. Each of the first screw portion and the second screw portion includes at least one of a screw groove and a screw thread. An axial position of at least a portion of the second screw portion overlaps with an axial position of the recording disk. | 02-26-2015 |
20150062750 | ROTATING DEVICE - A rotating device includes a stationary body, a rotating body formed with an opening encircling a rotation axis, a fluid dynamic bearing mechanism which supports the rotating body relative to the stationary body, and which has a portion at one end side fitted in and fixed to the opening, a support portion that protrudes from an outer circumference of the fluid dynamic bearing mechanism to support the rotating body, and an abutting portion provided at the rotating body so as to abut the support portion. The support portion includes a flange protruding outwardly in a radial direction from the outer circumference of the fluid dynamic bearing mechanism, and the abutting portion includes a step that is a recess which is formed along an open end of the opening and into which at least a part of the flange enters. | 03-05-2015 |
20150085397 | SPINDLE MOTOR AND DISK DRIVE APPARATUS - A spindle motor includes a stationary portion and a rotating portion. The stationary portion includes a shaft and the rotating portion includes a sleeve portion, a hub, a magnet, and a cap. The sleeve portion is arranged opposite to the shaft. The hub is made of metal, and includes a top plate portion extending radially outward from the sleeve portion, and an outer tubular portion extending downward from an outer edge of the top plate portion. The magnet is fixed to the outer tubular portion and is arranged opposite to the stator. The cap is made of metal, and includes an annular plate-shaped portion fixed to an upper surface of the top plate portion. The magnet has a coefficient of thermal expansion greater than that of the hub. The cap has a coefficient of thermal expansion greater than that of both the hub and the magnet. | 03-26-2015 |
20150085398 | SPINDLE MOTOR AND DISK DRIVE APPARATUS - A spindle motor includes a stationary portion with a shaft, a circular plate portion, a wall portion, and a plate portion. The plate portion has a flat plate portion and an annular convex portion. The sleeve includes an annular portion, an outer side cylindrical portion, and an inner side cylindrical portion. The inner side cylindrical portion and an upper radial dynamic pressure groove array are superimposed in a radial direction. The upper radial dynamic pressure groove array includes a plurality of upper spiral grooves that is inclined in one direction with respect to an axial direction and a plurality of lower spiral grooves that is inclined in another direction opposite to the one direction. A lower end of the upper spiral grooves is positioned farther on an upper side than an upper surface of the annular portion. | 03-26-2015 |
20150092299 | SPINDLE MOTOR AND HARD DISK DRIVE INCLUDING THE SAME - There are provided a spindle motor including a lower thrust member fixed to a base member; and a shaft fixed to the lower thrust member, wherein the lower thrust member includes a fitting protrusion protruding upwardly in the axial direction and fitted into a fixing groove formed in a lower end of the shaft so as to be depressed upwardly in the axial direction, a thrust bearing surface forming a thrust bearing between the thrust bearing surface and a lower surface of the sleeve, and an extension part protruding from an outer edge of the lower thrust member in a radial direction upwardly in the axial direction to form a liquid-vapor interface between the extension part and an outer surface of the sleeve while enclosing the sleeve, and the thrust bearing surface has inner and outer concave parts depressed in one of inner and outer diameter directions thereof, respectively. | 04-02-2015 |
20150109702 | MAGNETIC READ HEAD WITH ANTIFERROMAGNETIC LAYER - A tunnel magnetoresistance (TMR) read sensor having a tabbed AFM layer and an extended pinned layer and methods for making the same are provided. The TMR read sensor has an AFM layer recessed from the air bearing surface, providing a reduced shield-to-shield distance. | 04-23-2015 |
20150116865 | DISK DRIVE DEVICE AND MANUFACTURING METHOD OF A DISK DRIVE DEVICE - A disk drive device includes a stationary member and a rotatable member rotatably supported by the stationary member about a rotation axis. The rotatable member includes a cylindrical part, which fits in a center hole of a recording disk, and a placement part protruding radially outward from the cylindrical part in a direction of the rotation axis. The cylindrical part includes an external thread groove formed on an outer peripheral surface thereof. The external thread groove engages with a thread groove of a clamper to clamp the recording disk. The cylindrical part includes a small inner-edge inclined surface, which is a tapered annular surface formed on an end of the cylindrical part so that the external thread groove begins forming from the small inner-edge inclined surface. The small inner-edge inclined surface has an inner circumferential edge having a diameter smaller than a thread bottom diameter of the external thread groove. | 04-30-2015 |
20150124352 | FLEXIBLE CABLE ASSEMBLY HAVING REDUCED-TOLERANCE ELECTRICAL CONNECTION PADS - A flexible printed circuit (FPC) may have reduced-tolerance electrical connection pads that comprise a connection portion and an adjacent window portion, where the position of a component that is mechanically and electrically connected to the FPC is limited by the geometry of the connection portion of the respective connection pads. The window portion includes an area void of conductive material and bounded by the connection portion on one side and may be bounded by peripheral portions on the other sides, where the peripheral portions are significantly narrower than the connection portion. A portion of the peripheral portions extending from the connection portion may be tucked under a portion of the FPC cover layer to prevent peeling of the peripheral portions. | 05-07-2015 |
20150138669 | HEAD GIMBAL ASSEMBLY AND DISK UNIT PROVIDED WITH THE SAME - A head gimbal assembly includes a load beam, a wiring member including a metal plate disposed on the load beam, a magnetic head attached to a tip section of the wiring member, and a piezoelectric element that is fixed to and supported by supporting pads and deforms in response to a voltage applied thereto. The metal plate includes a tip section to which the magnetic head is fixed, and a base section that is spaced apart from the tip section and is fixed to the load beam. The supporting pads include first and second supporting pads proximate to the tip section and distal from the base section and a third supporting pad proximate to the base section and distal to the tip section, each of supporting pads separated from and independent of both the tip section and the base section. | 05-21-2015 |
20150138670 | SPINDLE MOTOR AND DISK DRIVE APPARATUS - A base member includes a base through-hole which interconnects an upper opening and a lower opening. An insulating sheet portion is disposed at a lower surface side of the base member. The insulating sheet portion covers at least a portion of the lower opening. Lead wires extending from coils extend to the lower surface side of the base member through the base through-hole. The lead wires extend radially outward along a lower surface of the insulating sheet portion while making contact with the insulating sheet portion. The lead wires are soldered to land portions of a circuit substrate. The lower opening is covered with a sealing material. The circuit substrate includes a first region. The insulating sheet portion is defined by a smaller number of layers than the first region. | 05-21-2015 |
20150146322 | DATA STORAGE DEVICE - According to an embodiment of the present invention, a data storage device comprising a motor having a stator is disclosed. The stator may include a substrate having a first surface and a second surface opposite to the first surface; and a n-phase winding arrangement having n phase windings; wherein each phase winding comprises m flat fractional-pitch coils arranged on the first surface of the substrate such that the coils are spaced apart uniformly along a closed loop and connected in series; wherein each coil together with an angular section of the substrate between the coil and an adjacent coil of the same phase winding defines a stator pole-pair; and wherein m is an integer larger than 1. | 05-28-2015 |
20150146323 | MAGNETIC RECORDING HEAD AND DISK DRIVE PROVIDED THEREWITH - According to one embodiment, a magnetic recording head includes a main pole configured to apply a recording magnetic field to a recording layer of a recording medium, a trailing shield opposed to the main pole with a write gap therebetween, and a high-frequency oscillator between the main pole and the trailing shield in a range of a width of the main pole in a track width direction, and configured to generate a high-frequency magnetic field. The high-frequency oscillator includes a spin injection layer, an intermediate layer, and an oscillation layer, and at least the oscillation layer comprises divided oscillation regions. | 05-28-2015 |
20150146324 | MAGNETIC RECORDING HEAD AND DISK DRIVE PROVIDED THEREWITH - According to one embodiment, a magnetic recording head includes a main pole configured to apply a recording magnetic field to a recording layer of a recording medium, a trailing shield opposed to the main pole with a write gap therebetween, and a high-frequency oscillator between the main pole and the trailing shield in a range of a width of the main pole in a track width direction, and configured to generate a high-frequency magnetic field. The high-frequency oscillator includes a spin injection layer, an intermediate layer, and an oscillation layer, and at least the oscillation layer comprises divided oscillation regions. | 05-28-2015 |
20150310886 | POWER FAILURE MANAGEMENT IN DISK DRIVES - 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. | 10-29-2015 |
20150318831 | CURRENT-LIMITING IN AN AMPLIFIER SYSTEM - One example includes an amplifier system. The system includes a gain stage configured to conduct a gain current in response to an input voltage. The system also includes a current limit stage coupled to the gain stage and being configured to one of source and sink the gain current and to define a limit amplitude of the gain current during a current limit condition. The system further includes an output stage coupled to the gain stage and configured to conduct an output current through an output node in response to the gain current, the output current having a maximum amplitude during the current limit condition that is proportional to the limit amplitude. | 11-05-2015 |
20150332711 | ASYMMETRIC MAMR HEAD WITH SELF-ALIGNED SPIN TORQUE OSCILLATOR ALONG FLARE EDGE FOR SHINGLED MAGNETIC RECORDING - The present disclosure generally relates to the structure of a perpendicular magnetic write head for use in a magnetic disk drive. A shingled-microwave-assisted magnetic recording head for use in a high-areal-density hard disk drive comprises a trailing shield, a flare-shaped main pole, one or more side shields, a spin torque oscillator, and two asymmetric side gaps, where one side gap has a smaller width than the other side gap. The spin torque oscillator shares a first continuous edge with the main pole on a side adjacent the side gap having the smaller width and shares a second continuous edge adjacent a media facing surface. The angle of the spin torque oscillator and the main pole formed by the media facing surface and the narrow side gap is greater than about 90°. | 11-19-2015 |
20150332733 | APPARATUS WITH SEALED CAVITY - Certain exemplary aspects of the present disclosure are directed towards an apparatus in which a base deck and a forged base deck cover are coupled to one another, via a weld joint, to provide a hermetically sealed cavity within. The base deck includes an outer region, and the base deck cover includes a lip that interfaces with the outer region of the base deck to provide the weld joint. Similarly, the base deck is formed by an outer region of a base deck bottom portion interfacing with a lip of the shroud to form, via welding, the base deck. | 11-19-2015 |
20150348574 | EXTENDED SPIN TORQUE OSCILLATOR - The present disclosure generally relates to a high-frequency oscillator for use in a recording device having a microwave-assisted magnetic recording head. The microwave-assisted magnetic recording head achieves a large assist effect by using an extended spin torque oscillator disposed between a main magnetic pole and a pole opposite the main magnetic pole. The spin torque oscillator obtains a strong high-frequency magnetic field and comprises a first non-magnetic spin scatterer, a reference layer, a first non-magnetic spin transfer layer, a first magnetic field generating layer, a second non-magnetic spin transfer layer, a second magnetic field generating layer, and a second non-magnetic spin scatterer. The spin torque oscillator has a drive current flowing though in the direction from the first magnetic field generating layer to the reference layer. | 12-03-2015 |
20150348583 | DISK DRIVE DEVICE - A disk drive device of the present disclosure includes a hub including a cylindrical portion with which a recording disk is to be engaged, and fixed with an annular magnet, a base including a support which supports a stator core including coils, and, a bottom which is integral with the support and which faces the coils in an axial direction, a fluid bearing mechanism supporting the hub in a manner freely rotatable relative to the base, and an annular member fixed to an inner circumference of the cylindrical portion of the hub and including a first part that is present in an area where the base and the magnet face with each other. | 12-03-2015 |
20150380022 | MICROWAVE ASSISTED MAGNETIC RECORDING HEAD AND MAGNETIC RECORDING DEVICE HAVING THE SAME - A magnetic recording head includes a main magnetic pole in which a recording magnetic field is generated, a write shield magnetic pole disposed alongside the main magnetic pole with a gap therebetween, a spin torque oscillator disposed within the gap and configured to generate a microwave, an anti-ferromagnetic layer disposed within the gap between the write shield magnetic pole and the spin torque oscillator, and a non-magnetic metal layer disposed within the gap between the spin torque oscillator and the anti-ferromagnetic layer. | 12-31-2015 |
20150380026 | HEATED AFM LAYER DEPOSITION AND COOLING PROCESS FOR TMR MAGNETIC RECORDING SENSOR WITH HIGH PINNING FIELD - Systems and methods are provided for manufacturing a magnetic recording sensor for use in a magnetic reader, such as a tunneling magnetoresistance (TMR) readers. The magnetic recording sensor can be manufactured by heating a substrate in a first chamber and depositing an antiferromagnetic (AFM) layer on the heated substrate. Additionally, a first pinned layer is added onto the AFM layer, and the substrate is subsequently cooled. | 12-31-2015 |
20160035382 | MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING AND REPRODUCING APPARATUS - According to one embodiment, a magnetic recording medium includes an orientation control layer formed on a non-magnetic substrate, the orientation control layer made of a Ni alloy or Ag alloy having fcc structure, a non-magnetic seed layer made of Ag, Ge, and a metal X selected from the group consisting of Al, Mg, Au, and Ti, a non-magnetic intermediate layer made of Ru or Ru alloy, and a magnetic recording layer. The orientation control layer is in contact with the non-magnetic seed layer. | 02-04-2016 |
20160049172 | ENERGY TRANSFER BETWEEN DATA STORAGE DEVICES WITH MOVING PARTS - A system that includes a first data storage element actuated by a first electric motor. The system also includes a second data storage element actuated by a second electric motor. An electrical connector assembly transfers electrical energy from a back electromotive force generated in the first electric motor, by movement of the first data storage element, to the second electric motor to thereby energize the second electric motor. | 02-18-2016 |
20160055880 | SPINDLE MOTOR AND RECORDING DISK DRIVING DEVICE INCLUDING THE SAME - A spindle motor includes a base member including an installation member formed of a magnetic material, a sleeve fixedly coupled to a mounting part provided in the base member, a shaft rotatably installed in a shaft hole of the sleeve, a rotor hub installed on an upper end portion of the shaft to rotate together with the shaft, a driving magnet fixedly coupled to a lower surface of the rotor hub, and a coil fixedly coupled to the installation member so as to be disposed to face the driving magnet. | 02-25-2016 |
20160056675 | BRUSHLESS MOTOR AND DISK DRIVE APPARATUS - A brushless motor includes a stationary unit and a rotary unit rotatably supported with respect to the stationary unit. The stationary unit includes an armature and a base member arranged to support the armature. The rotary unit includes a magnet, a hub made of a magnetic material and a rotor yoke made of a magnetic material. The armature includes a plurality of coil patterns arranged along a circumferential direction. The hub includes an inner lower surface, an outer lower surface and a recess portion. The recess portion is arranged between the inner lower surface and the outer lower surface and depressed upward. At least a portion of the magnet is accommodated within the recess portion. At least one of the inner lower surface and the outer lower surface is positioned above a lower surface of the magnet. | 02-25-2016 |
20160078890 | HEAD GIMBAL ASSEMBLY AND STORAGE DEVICE PROVIDED WITH THE SAME - A head gimbal assembly includes a load beam, a wiring member including a metal plate disposed on the load beam, a magnetic head attached to a tip section of the wiring member, and a piezoelectric element that is fixed to and supported by supporting pads and deforms in response to a voltage applied thereto. The metal plate includes a tip section to which the magnetic head is fixed, and a base section that is spaced apart from the tip section and is fixed to the load beam. The supporting pads include first and second supporting pads proximate to the tip section and distal from the base section and a third supporting pad proximate to the base section and distal to the tip section, each of supporting pads separated from and independent of both the tip section and the base section. | 03-17-2016 |
20160078894 | BASE MEMBER, SPINDLE MOTOR HAVING THE SAME, AND RECORDING DISK DRIVING DEVICE - There is provided a spindle motor including: a stator core around which a coil is wound; a base member to which the stator core is fixedly attached and in which a coil lead hole is disposed below the stator core; and a coating layer which is provided in the coil lead hole and in the vicinity of the coil lead hole. | 03-17-2016 |
20160078895 | SPINDLE MOTOR AND HARD DISK DRIVE INCLUDING THE SAME - A spindle motor includes a stator, and a rotor forming a bearing clearance filled with a lubricating fluid, together with the stator. At least one of the rotor and the stator is provided with a circulation hole through which air bubbles contained in the lubricating fluid are discharged, and a portion of the bearing clearance connected to one end portion of the circulation hole and disposed at an outer side of the circulation hole in a radial direction has a width allowing an amount of force applied to the other side of the air bubble to be less than that of force applied to one side of the air bubble when one side of the air bubble is disposed in the circulation hole and the other side thereof is disposed in the portion of the bearing clearance connected to the circulation hole. | 03-17-2016 |
20160078896 | SPINDLE MOTOR AND HARD DISK DRIVE INCLUDING THE SAME - A spindle motor includes a stator, and a rotor forming a bearing clearance with the stator. The rotor is provided with an insertion groove formed therein into which a portion of the stator is inserted, and first and second sealing parts having liquid-vapor interfaces formed therein, respectively, are formed inside and outside the insertion groove, respectively. The first and second sealing parts are in communication with each other via a connection hole. | 03-17-2016 |
20160086631 | CHARGE CONTROL AGENT FOR FLUID DYNAMIC BEARING MOTOR LUBRICANT - Embodiments disclosed herein generally relate to magnetic recording systems having a spindle motor and, more particularly, to an optimized lubricant for bearings within the spindle motor. A lubricant used in a fluid dynamic bearing motor has an antioxidant additive and a charge control agent dissolved in a diester base oil. The charge control agent is chemically attached to the same diacid reactant used in the diester lubricant base oil, and is prepared through an esterification reaction. The charge control agent is then dissolved in the lubricant base oil. The charge control agent is soluble in the lubricant, and is resistant to free radical oxidation. The charge control agent effectively controls the charge of the lubricant by creating electron donor/acceptor sites in the lubricant, facilitating an independent electronic pathway through the lubricant. | 03-24-2016 |
20160111124 | Fluid Dynamic Bearing Groove Configuration - A fluid dynamic bearing (FDB) includes a groove configuration that includes a pressure-generating groove pattern, and additionally includes a circumferential groove adjacent to the pressure-generating groove pattern and a pumping groove pattern adjacent to the circumferential groove. The circumferential groove may be deeper than the associated pumping and pressure-generating groove patterns and may extend for 360 degrees, and the pumping groove may be positioned at or near the entry to the bearing journal area to help maintain fluid flow direction and minimum pressure. Such an FDB groove configuration is likely to provide improved damping characteristics while maintaining relative stiffness, thereby improving vibration response characteristics. | 04-21-2016 |
20160153490 | FLUID BEARING APPARATUS, SPINDLE MOTOR, AND DISK DRIVE APPARATUS | 06-02-2016 |
20160180870 | MAGNETIC READ HEAD WITH ANTIFERROMAGENTIC LAYER | 06-23-2016 |
20160190875 | SPINDLE MOTOR AND DISK DRIVE APPARATUS - A stationary portion of a spindle motor includes a stator portion and an outside surface. The stator portion includes a stator core and coils. The outside surface extends in an axial direction parallel or substantially parallel to a central axis, and is centered on the central axis. The spindle motor includes a fixing portion at which an inside surface of the stator core and the outside surface are fixed to each other. The fixing portion includes a first press fit portion, a second press fit portion, and a gap arranged therein. The gap is located between the first press fit portion and the second press fit portion. The second press fit portion is located above the first press fit portion. At least a portion of the second press fit portion is located above a middle of the stator core in the axial direction. | 06-30-2016 |
20160190885 | SPINDLE MOTOR AND DISK DRIVE APPARATUS - A spindle motor includes a stationary portion and a rotating portion arranged to rotate about a central axis extending in a vertical direction with respect to the stationary portion. The stationary portion includes a stator portion including a stator core including an annular core back and a plurality of tooth portions arranged to extend radially outward from the core back, and coils wound around the plurality of tooth portions; an outside surface press fitted to an inside surface of the core back; and a fixing member arranged at least on an upper surface of the core back. Conducting wires defining the coils include passage lines each of which is arranged to join different ones of the coils to each other; and lead wires each of which is drawn out from one of the coils, and is drawn out from an upper side of upper surfaces of the tooth portions to a lower side of lower surfaces of the tooth portions. Each of the passage lines and the lead wires is arranged radially outward of the inside surface of the core back. The fixing member is arranged to fix at least a portion of each passage line and at least a portion of each lead wire to the stator core. | 06-30-2016 |
20170236538 | MAGNETO-RESISTIVE EFFECT ELEMENT HAVING SIDE SHIELD INTEGRATED WITH UPPER SHIELD | 08-17-2017 |