Rotational Drive Detail Patents (Class 360/99.08)
  • Publication number: 20150092299
    Abstract: 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.
    Type: Application
    Filed: January 30, 2014
    Publication date: April 2, 2015
    Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventors: Song Bon Oh, Shin Young Cheong, Kum Kyung Lee
  • Patent number: 8995083
    Abstract: There are provided a spindle motor and a hard disk drive including the same. The spindle motor includes: a sleeve supporting a shaft so that an upper end of the shaft protrudes upwardly in an axial direction and a bearing clearance filled with a lubricating fluid formed between the sleeve and the shaft; a housing provided so as to enclose an outer peripheral surface of the sleeve and forming a circulation hole between the housing and the sleeve in the axial direction; and a rotor hub fixedly installed on an upper end portion of the shaft in the axial direction, wherein a connection part is formed between the housing and the rotor hub so as to allow a sealing part on which a liquid-vapor interface is disposed and the circulation hole to be in communication with each other.
    Type: Grant
    Filed: August 22, 2013
    Date of Patent: March 31, 2015
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventor: Duck Young Kim
  • Patent number: 8995084
    Abstract: The disk drive device includes a base member with a first upper surface and a second lower surface, a hub, a bearing unit arranged on the base member that rotatably supports the hub, a spindle drive unit that drives the hub to rotate, and a wiring member arranged on the second surface of the base member. The spindle drive unit includes a stator core having a salient pole with coil wound around, and a magnet opposed thereto. The base member includes a wire hole through which a wire is placed, with a first opening on the first surface and a second opening on the second surface. A concaved area on the second surface includes a lower slope, axially between the concaved area and the second opening on which a wiring member is arranged. The wire is connected to the wiring member, radially outside of an outer diameter of the magnet.
    Type: Grant
    Filed: August 26, 2014
    Date of Patent: March 31, 2015
    Assignee: Samsung Electro-Mechanics Japan Advanced Technology Co., Ltd.
    Inventors: Tomoyuki Tashiro, Takanori Watanabe, Hiroshi Iwai
  • Publication number: 20150085397
    Abstract: 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.
    Type: Application
    Filed: August 13, 2014
    Publication date: March 26, 2015
    Inventor: Atsushi YAWATA
  • Publication number: 20150085398
    Abstract: 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.
    Type: Application
    Filed: August 13, 2014
    Publication date: March 26, 2015
    Inventors: Atsushi YAWATA, Hirotoshi UCHIBORI, Toshihiro AKIYAMA
  • Patent number: 8988820
    Abstract: A rotating device includes a hub on which a magnetic recording disk is to be mounted, a base supporting the hub in a freely rotatable manner through a fluid dynamic bearing, a stator core which is fixed to the base, and which includes an annular portion and multiple salient poles extending therefrom, coils wound around the respective salient poles, and a flexible printed board transmitting electrical power to the coils. A drawn wire of the coil is electrically connected with the flexible printed board at a connection position avoiding a location right below the coil where the drawn wire is drawn.
    Type: Grant
    Filed: November 18, 2014
    Date of Patent: March 24, 2015
    Assignee: Samsung Electro-Mechanics Japan Advanced Technology Co., Ltd.
    Inventor: Tomoyuki Tashiro
  • Publication number: 20150077877
    Abstract: 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.
    Type: Application
    Filed: November 24, 2014
    Publication date: March 19, 2015
    Inventors: Koji Adachi, Ian J. Beresford, Thomas Y. Chang, Kuo Hsing Hwang, Jim P. Hennessy, David Perez
  • Patent number: 8975797
    Abstract: A disk-rotating motor includes a rotor section including a rotor magnet attached to a rotor frame and a shaft fixed to a center of the rotor frame, and a stator section including a shaft-bearing which bears the shaft, wherein the stator section includes the shaft-bearing, a shaft-bearing housing which holds the shaft-bearing, a thrust plate which bears the shaft in an axis direction, a stator core which is arranged to face the rotor magnet and provided with wire-winding, a core holder which holds the stator core, and a bracket which holds the shaft-bearing housing. The bracket has a projecting part which fixes the shaft-bearing at a central part thereof, an inner diameter part of the shaft-bearing is press-fitted to be tightened to the projecting part, and an outer diameter part of the shaft-bearing housing is adhered to be tightened to an inner diameter part of the core holder.
    Type: Grant
    Filed: March 4, 2010
    Date of Patent: March 10, 2015
    Assignee: Minebea Co., Ltd.
    Inventors: Toshiyuki Nishikata, Kumio Masuda
  • Patent number: 8976487
    Abstract: 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.
    Type: Grant
    Filed: November 7, 2013
    Date of Patent: March 10, 2015
    Assignee: Samsung Electro-Mechanics Japan Advanced Technology Co., Ltd.
    Inventors: Mitsuo Kodama, Taketo Nonaka, Masafumi Mizuno
  • Patent number: 8976486
    Abstract: 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.
    Type: Grant
    Filed: October 14, 2013
    Date of Patent: March 10, 2015
    Assignee: Samsung Electro-Mechanics Japan Advanced Technology Co., Ltd.
    Inventors: Hirotake Nishino, Akira Suzuki, Kazuyoshi Nagai
  • Publication number: 20150062750
    Abstract: 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.
    Type: Application
    Filed: August 27, 2014
    Publication date: March 5, 2015
    Applicant: SAMSUNG ELECTRO-MECHANICS JAPAN ADVANCED TECHNOLOGY CO. LTD
    Inventors: Akikazu IZUMI, Hiroshi MORIMOTO
  • Patent number: 8970984
    Abstract: A spindle includes a fixed member, a hub rotatably attached to the fixed member, and a bearing between the rotatable hub and the fixed member. The bearing including a bearing lubricant. A seal reduces migration of the bearing lubricant away from the bearing. The seal includes an immobile cylindrical surface of the fixed member, and a rotatable cylindrical surface of the hub. One of these surfaces includes a plurality of grooves. The immobile cylindrical surface and the rotatable cylindrical surface are concentric about the hub rotation axis. The rotatable cylindrical surface faces and is separated from the immobile cylindrical surface by a gas-filled radial clearance of not less than 50 microns.
    Type: Grant
    Filed: April 29, 2014
    Date of Patent: March 3, 2015
    Assignee: Western Digital Technologies, Inc.
    Inventor: Klaus Kloeppel
  • Publication number: 20150055247
    Abstract: 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.
    Type: Application
    Filed: July 14, 2014
    Publication date: February 26, 2015
    Inventors: Hironori ANDO, Mitsuhiro TAKEMOTO
  • Publication number: 20150055246
    Abstract: 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.
    Type: Application
    Filed: May 1, 2014
    Publication date: February 26, 2015
    Applicant: NIDEC CORPORATION
    Inventor: Akinobu SUMIJI
  • Publication number: 20150055248
    Abstract: 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.
    Type: Application
    Filed: August 13, 2014
    Publication date: February 26, 2015
    Inventors: Katsuya TAKAHASHI, Yuki TAJIMA, Kazuhiro SATO, Yuya SAITO, Hironori ANDO, Masahiro SHIRAISHI
  • Patent number: 8964329
    Abstract: 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.
    Type: Grant
    Filed: April 30, 2014
    Date of Patent: February 24, 2015
    Assignee: Nidec Corporation
    Inventors: Masanobu Taki, Hiroshi Kobayashi, Tomohiro Yoneda, Makoto Yamashita
  • Patent number: 8964330
    Abstract: 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.
    Type: Grant
    Filed: July 16, 2014
    Date of Patent: February 24, 2015
    Assignee: Samsung Electro-Mechanics Japan Advanced Technology Co., Ltd.
    Inventor: Kazuhiro Matsuo
  • Patent number: 8953280
    Abstract: There is provided a spindle motor including: a shaft including a body portion having a fixing recess formed on a lower portion thereof, a flange portion extending in an outer radial direction from an upper portion of the body portion, and a first insertion portion extending downwardly from the flange portion in an axial direction; a lower thrust member including a fixed portion inserted into the fixing recess, a disk portion extending from the fixed portion in an outer radial direction, and first and second protrusion portions extending from the disk portion in the axial direction; a base member coupled to the second protrusion portion; and a rotating member forming a bearing clearance with the shaft and provided to be rotatable with respect to the shaft.
    Type: Grant
    Filed: March 13, 2013
    Date of Patent: February 10, 2015
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventor: Viatcheslav Smirnov
  • Publication number: 20150036240
    Abstract: 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.
    Type: Application
    Filed: March 4, 2014
    Publication date: February 5, 2015
    Applicant: WD Media, LLC
    Inventors: YASUO SAKANE, KIM THUY THI LAI, SHAUN H. CHEN, BING-SHIUAN CHANG
  • Patent number: 8946953
    Abstract: There is provided a base assembly for a motor, the base assembly including: a base supporting rotation of a rotating member of the motor; and a pulling plate provided to the base to thereby prevent excessive floating of the rotating member, wherein the pulling plate includes a body part not in contact with the base and an extension part extended from the body part to thereby contact the base.
    Type: Grant
    Filed: January 24, 2012
    Date of Patent: February 3, 2015
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventors: Dong Jin Kim, Young Ha Park
  • Publication number: 20150029614
    Abstract: 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.
    Type: Application
    Filed: July 16, 2014
    Publication date: January 29, 2015
    Applicant: SAMSUNG ELECTRO-MECHANICS JAPAN ADVANCED TECH. CO. LTD.
    Inventor: Kazuhiro MATSUO
  • Patent number: 8941946
    Abstract: 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.
    Type: Grant
    Filed: May 3, 2013
    Date of Patent: January 27, 2015
    Assignee: Nidec Corporation
    Inventor: Yoichi Sekii
  • Patent number: 8941947
    Abstract: 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.
    Type: Grant
    Filed: October 11, 2013
    Date of Patent: January 27, 2015
    Assignee: Minebea Co., Ltd.
    Inventors: Hideaki Showa, Ryoichi Kurosawa, Hironobu Tsuge
  • Publication number: 20150022919
    Abstract: 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.
    Type: Application
    Filed: October 7, 2014
    Publication date: January 22, 2015
    Inventors: Masakazu MATSUYAMA, Ryosuke ONOE, Kazuhiro FUJITANI, Xiang ZHANG
  • Publication number: 20150015993
    Abstract: 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.
    Type: Application
    Filed: January 23, 2014
    Publication date: January 15, 2015
    Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventors: Hyun Chul Lee, Shin Young Cheong
  • Publication number: 20150015992
    Abstract: 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.
    Type: Application
    Filed: September 10, 2013
    Publication date: January 15, 2015
    Applicant: Kabushiki Kaisha Toshiba
    Inventor: Tomomi FUNAYAMA
  • Patent number: 8931175
    Abstract: It is an object of the present invention to provide a bearing member having a highly accurate dynamic pressure generating portion stably at low cost. Dynamic pressure grooves (8a1) and (8a2) are formed as the dynamic pressure generating portions on an inner circumferential surface of the electroforming portion (10) by an electroforming process, and injection molding is performed by using a resin while inserting the electroforming portion (10), thereby forming a bearing member (8). A shaft member (2) is inserted into an inner circumference of the bearing member.
    Type: Grant
    Filed: March 30, 2012
    Date of Patent: January 13, 2015
    Assignee: NTN Corporation
    Inventors: Natsuhiko Mori, Nobuyoshi Yamashita, Fuminori Satoji, Isao Komori, Toshiyuki Mizutani, Masafumi Okuma, Kenichi Mitani
  • Patent number: 8934195
    Abstract: Thus, if a shock or other disturbance to a disc stack spindle bearing assembly occurs that tilts the bearing assembly, the resulting motion is both a tilting, and a motion which is axial. If a shock axially moves the hub assembly, only an axial motion occurs. Thus the system has a non-linear behavior. Pursuant to this invention, when a tilting disturbance occurs, and some of it is dissipated in a net axial movement at a different frequency, energy is subtracted out of the system with motion that is not linearly related to the disturbance that created it.
    Type: Grant
    Filed: September 14, 2012
    Date of Patent: January 13, 2015
    Assignee: Seagate Technology LLC
    Inventors: Hans Leuthold, Susan Immisch, Saul Ceballos, Michael Tiller
  • Patent number: 8934196
    Abstract: A rotating apparatus includes a hub, a shaft housing portion having a center through-hole, and a base plate, having a base circular part that extends axially and with an inner surface thereof used as a bearing hole. Further included is a shaft with a cylindrical section housed in the through-hole, an extending section formed integrally with the cylindrical section and extending radially from a first end of the cylindrical section, and an annular section provided radially from a second end of the cylindrical section. Provided on the inner surface of the through-hole is a groove configured to generate radial dynamic pressure in lubricant. The rotatable rotor includes a portion encircling at least part of the annular section. An opening of the bearing hole surrounds a part of the shaft housing portion, the extending section inserted and fixed into the opening, with a hardening resin interposed therebetween.
    Type: Grant
    Filed: November 13, 2013
    Date of Patent: January 13, 2015
    Assignee: Samsung Electro-Mechanics Japan Advanced Technology Co., Ltd.
    Inventors: Mitsuo Kodama, Ryusuke Sugiki, Akira Aoi
  • Patent number: 8929025
    Abstract: A clamping device for coupling a rotatable component of a machine with a shaft, including a balance hole configured to confine a counterweight. The clamping device includes a circular plate. The circular plate includes at least one fastener hole configured to accept a fastener, and at least one balance hole. The fastener is configured to fasten the clamping device to couple the component with the shaft. The balance hole includes a cavity configured to accept a counterweight. The counterweight is configured to balance the rotational motion of at least the circular plate when the shaft is rotated. Moreover, the cavity is configured to confine the counterweight to an end of the cavity by effects of rotation of the shaft on the counterweight when the shaft is rotated.
    Type: Grant
    Filed: September 21, 2010
    Date of Patent: January 6, 2015
    Assignee: HGST Netherlands B.V.
    Inventors: Chisin Chiang, Antony Nguyen, Jr-Yi Shen
  • Patent number: 8928196
    Abstract: There is provided a spindle motor including: a sleeve rotatably supporting a shaft; a rotor coupled to an upper end of the shaft and rotating in conjunction with the shaft; a stopper portion coupled to a main wall portion protruded from one surface of the rotor and facing an outer circumferential surface of the sleeve; a stator holder having a fixed portion coupled to an outer circumferential surface of the sleeve, an installation portion to which a core having a coil wound therearound is fixed, and a connection portion connecting an upper end of the fixed portion and an upper end of the installation portion; and a base member fixedly coupled to the stator holder.
    Type: Grant
    Filed: March 12, 2013
    Date of Patent: January 6, 2015
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventor: Viatcheslav Smirnov
  • Patent number: 8922945
    Abstract: A spindle motor includes a stationary unit, a rotary unit and a bearing mechanism. The stationary unit includes a base member, a stator including a plurality of coils and a wiring substrate electrically connected to the stator. The base member includes a tubular portion, a first accommodation portion, an opening portion, a plurality of coil accommodation portions, a second accommodation portion, and at least one through-hole. The wiring substrate includes an arc portion and an extension portion. A lead wire is led out from at least one of the coils and is connected to the arc portion by soldering within the through-hole.
    Type: Grant
    Filed: February 14, 2013
    Date of Patent: December 30, 2014
    Assignee: Nidec Corporation
    Inventors: Shintaro Saeki, Atsushi Yawata, Yoichi Sekii, Takehito Tamaoka, Hiroyuki Abe
  • Patent number: 8922943
    Abstract: 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.
    Type: Grant
    Filed: November 18, 2011
    Date of Patent: December 30, 2014
    Assignee: Nidec Corporation
    Inventors: Hiroki Yamada, Junya Mizukami, Tsuyoshi Morita, Tetsuya Maruyama, Takuro Iguchi
  • Patent number: 8922944
    Abstract: A rotating device includes: a hub that is rotatably supported by a base, on which a recording disk is to be mounted; a stator core fixed to the base, the core having a ring portion and multiple salient poles that radially extend from the ring portion; and a magnet fixed to the hub, the magnet having multiple magnetic poles arranged along its circumference on its side surface on the salient pole side. The magnet is arranged such that its side surface on the salient pole side faces a side surface of each salient pole and a side surface of a portion of the hub that faces the stator core along a rotational axis direction.
    Type: Grant
    Filed: January 24, 2013
    Date of Patent: December 30, 2014
    Assignee: Samsung Electro-Mechanics Japan Advanced Technology Co., Ltd.
    Inventors: Mitsuo Kodama, Daiki Hayashi, Takanori Watanabe, Takuji Yamada
  • Patent number: 8917479
    Abstract: A device includes a magnet and a magnetizer. The magnetizer is operable to rotate with respect to the magnet. The rotation generates an acoustic pure tone at a particular frequency. A combination of the magnet and the magnetizer has a magnetic profile. The combination is altered to superimpose a particular harmonic shape on the magnetic profile to reduce the acoustic pure tone at the particular frequency.
    Type: Grant
    Filed: May 10, 2013
    Date of Patent: December 23, 2014
    Assignee: Seagate Technology LLC
    Inventors: Ungtae Kim, Paco G. Flores
  • Publication number: 20140368951
    Abstract: 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.
    Type: Application
    Filed: August 23, 2013
    Publication date: December 18, 2014
    Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventors: Dong Hyun LEE, Song Bon OH
  • Publication number: 20140368943
    Abstract: A semiconductor integrated circuit device has a p-type substrate to which a ground voltage is applied and a floating-type NMOSFET which is integrated on the p-type substrate and to which a negative voltage lower than the ground voltage is applied. The floating-type NMOSFET includes an n-type buried layer buried in the p-type substrate, a high voltage n-type well formed on the n-type buried layer and floats electrically, a p-type drift region formed in the n-type well, an n-type drain region and an-type source region formed in the p-type drift region, and a gate electrode formed on a channel region interposed between the n-type drain region and the n-type source region. The high voltage n-type well includes an n-type tunnel region, with a higher impurity concentration than that of the high voltage n-type well, inside a peripheral region formed so as to surround the p-type drift region.
    Type: Application
    Filed: June 14, 2013
    Publication date: December 18, 2014
    Inventor: Yasuhiro MIYAGOE
  • Publication number: 20140368950
    Abstract: 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.
    Type: Application
    Filed: June 14, 2013
    Publication date: December 18, 2014
    Applicant: Rohm Co., Ltd.
    Inventor: Hironori Sumitomo
  • Publication number: 20140368952
    Abstract: 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.
    Type: Application
    Filed: August 23, 2013
    Publication date: December 18, 2014
    Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventor: Shin Young CHEONG
  • Publication number: 20140368949
    Abstract: 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.
    Type: Application
    Filed: June 14, 2013
    Publication date: December 18, 2014
    Inventor: Hisashi SUGIE
  • Patent number: 8913343
    Abstract: 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.
    Type: Grant
    Filed: June 14, 2012
    Date of Patent: December 16, 2014
    Assignee: Samsung Electro-Mechanics Japan Advanced Technology Co., Ltd.
    Inventor: Daiki Hayashi
  • Patent number: 8913344
    Abstract: An apparatus includes a fluid dynamic bearing and means for dynamically adjusting the stiffness or damping of the fluid dynamic bearing.
    Type: Grant
    Filed: October 25, 2013
    Date of Patent: December 16, 2014
    Assignee: Seagate Technology LLC
    Inventors: Norbert Steven Parsoneault, Hans Leuthold, Paco Gregor Flores, Timothy Edward Langlais, Matthew M. McConnell, Chris M. Woldemar
  • Publication number: 20140362470
    Abstract: 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.
    Type: Application
    Filed: April 30, 2014
    Publication date: December 11, 2014
    Applicant: NIDEC CORPORATION
    Inventors: Masanobu TAKI, Hiroshi KOBAYASHI, Tomohiro YONEDA, Makoto YAMASHITA
  • Publication number: 20140362469
    Abstract: 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.
    Type: Application
    Filed: April 11, 2014
    Publication date: December 11, 2014
    Applicant: Nidec Corporation
    Inventors: Masanobu TAKI, Hiroshi KOBAYASHI, Tomohiro YONEDA
  • Publication number: 20140362468
    Abstract: 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.
    Type: Application
    Filed: September 9, 2013
    Publication date: December 11, 2014
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Tomoko Taguchi, Kenichiro Yamada
  • Publication number: 20140362471
    Abstract: 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.
    Type: Application
    Filed: August 26, 2014
    Publication date: December 11, 2014
    Inventors: Tomoyuki TASHIRO, Takanori Watanabe, Hiroshi Iwai
  • Patent number: 8908321
    Abstract: There are provided a spindle motor and a hard disk drive including the same. The spindle motor includes a sleeve fixedly installed on a base member and including a circulation hole formed in an axial direction; a shaft rotatably inserted into the sleeve; a rotor hub fixedly installed on an upper end portion of the shaft; and a thrust member installed in an installation groove formed in an upper portion of the sleeve in the axial direction and forming a connection part allowing the circulation hole to be in communication with a sealing part formed by the sleeve and the rotor hub and having a liquid-vapor interface, wherein the connection part is formed between the sleeve and the thrust member in a circumferential direction, and a gap on any one side of the connection part in a radial direction is larger than a gap on the other side thereof.
    Type: Grant
    Filed: June 13, 2013
    Date of Patent: December 9, 2014
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventor: Duck Young Kim
  • Patent number: 8908320
    Abstract: 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.
    Type: Grant
    Filed: March 5, 2013
    Date of Patent: December 9, 2014
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventors: Ta Kyoung Lee, Satoru Sodeoka
  • Patent number: 8908324
    Abstract: 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.
    Type: Grant
    Filed: April 11, 2014
    Date of Patent: December 9, 2014
    Assignee: Nidec Corporation
    Inventors: Masanobu Taki, Hiroshi Kobayashi, Tomohiro Yoneda
  • Patent number: 8908322
    Abstract: 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.
    Type: Grant
    Filed: August 23, 2013
    Date of Patent: December 9, 2014
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventor: Shin Young Cheong