Rotational Drive Detail Patents (Class 360/99.08)
  • Patent number: 10373644
    Abstract: A spindle motor is provided, the motor comprising: a base plate, a PCB on the base plate, a bearing assembly arranged on the base plate, a stator coupled to a periphery of the bearing assembly, a rotor rotationally coupled to the bearing assembly, the rotor including a yoke and a magnet, and a rotation shaft rotationally coupled to the bearing assembly. The base plate includes a planar portion and a protruding portion arranged along with a periphery of the yoke, the protruding portion being apart from the yoke. The base plate is partially covered with the PCB in a region where the stator is arranged. And, a height from the planar portion to an upper surface of the protruding portion is smaller than a height from the planar portion to a lower surface of the periphery of the yoke.
    Type: Grant
    Filed: January 25, 2018
    Date of Patent: August 6, 2019
    Assignee: LG INNOTEK CO., LTD.
    Inventor: Hoeop Yoon
  • Patent number: 10337209
    Abstract: A motor for an electronic lock. The motor drives the electronic lock between a locked position and an unlocked position. A printed circuit board is mounted onto the motor. The printed circuit board includes a motor battery that is mounted onto the printed circuit board. A lock memory device is also mounted onto the printed circuit board and keeping a record of the usage of the electronic lock. In a preferred embodiment, the motor battery is remotely mounted and is connected to the printed circuit board via a wire connection.
    Type: Grant
    Filed: October 25, 2016
    Date of Patent: July 2, 2019
    Inventor: Leslie Ho Leung Chow
  • Patent number: 10320258
    Abstract: In this stator, a passage line extending in a circumferential direction is disposed in a circumferential gap between two circumferentially adjacent ones of coils. A lead wire continuous with a conducting wire defining one of the coils includes a bend portion being bent in the gap with the passage line serving as a supporting point; a led-out portion arranged to extend from the coil to one side in an axial direction to the bend portion; and a connection portion arranged to extend from the bend portion to another side in the axial direction. At least a portion of a portion of the lead wire which overlaps with the passage line when viewed in a radial direction is arranged at a radial position between the passage line and a core back.
    Type: Grant
    Filed: September 21, 2016
    Date of Patent: June 11, 2019
    Assignee: NIDEC CORPORATION
    Inventor: Hiroyuki Abe
  • Patent number: 10236745
    Abstract: A circuit board is in the shape of a strip and includes: in one longitudinal end portion thereof, power connection portions connected to an external power supply; in another longitudinal end portion thereof, land portions to which portions of conducting wires drawn out downwardly of a base portion are connected; and pattern portions electrically connected to the power connection portions and the land portions. The land portions include a first land portion, and a second land portion arranged adjacent to the first land portion. The pattern portions include a first pattern portion electrically connected to the first land portion, and a second pattern portion arranged adjacent to the first pattern portion, and electrically connected to the second land portion. The first pattern portion and the second land portion are arranged to overlap with each other when viewed in a widthwise direction of the circuit board.
    Type: Grant
    Filed: November 21, 2016
    Date of Patent: March 19, 2019
    Assignee: NIDEC CORPORATION
    Inventors: Michihiro Ito, Mitsuo Kodama, Tadashi Hasegawa
  • Patent number: 10109312
    Abstract: A motor that rotates an annular member includes a stationary portion including a stator, and a rotating portion arranged to be rotatable about a central axis extending in a vertical direction. The rotating portion includes a hub extending in an annular shape around the central axis; a magnet including a pole surface arranged radially opposite to the stator; and a yoke to which the magnet is fixed. The yoke includes a yoke increased thickness portion arranged radially outside of the magnet; and a yoke decreased thickness portion with a radial thickness smaller than that of the yoke increased thickness portion, and arranged axially above the yoke increased thickness portion. The yoke decreased thickness portion is fixed to the hub annular portion through press fitting.
    Type: Grant
    Filed: June 27, 2017
    Date of Patent: October 23, 2018
    Assignee: NIDEC CORPORATION
    Inventors: Masahiro Shiraishi, Katsuya Takahashi
  • Patent number: 9935528
    Abstract: A base portion of a spindle motor includes a base portion through hole passing therethrough from an upper surface to a lower surface thereof. Coils include a lead wire drawn out from above the upper surface downwardly from the lower surface through the base portion through hole. A circuit board includes a land portion to which the lead wire is connected. The spindle motor includes an insulation sheet portion configured to cover at least a portion of the base portion through hole and with which the lead wire is arranged to be in contact. A thickness of the insulation sheet portion is greater than a thickness of the land portion.
    Type: Grant
    Filed: May 21, 2015
    Date of Patent: April 3, 2018
    Assignee: NIDEC CORPORATION
    Inventors: Tomohiro Yoneda, Hiroshi Kobayashi, Masanobu Taki
  • Patent number: 9865298
    Abstract: Provided herein is an apparatus, including a stationary component, a rotatable component configured to rotate relative to the stationary component, and a conical pumping seal formed between the stationary component and the rotatable component.
    Type: Grant
    Filed: March 13, 2014
    Date of Patent: January 9, 2018
    Assignee: Seagate Technology LLC
    Inventors: Hans Leuthold, Lynn Bich-Quy Le, Chris M. Woldemar
  • Patent number: 9837872
    Abstract: 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.
    Type: Grant
    Filed: December 31, 2014
    Date of Patent: December 5, 2017
    Assignee: NIDEC CORPORATION
    Inventors: Yoichi Sekii, Takehito Tamaoka, Kazuhiro Sato, Kazuhiko Fukushima, Hiroyuki Abe
  • Patent number: 9777734
    Abstract: A thin type fan includes an impeller and a motor. The impeller includes a hub and a blade structure disposed around the hub. The motor includes a stator structure, a magnetic assembly, a bearing structure and a rotational shaft. The motor drives the impeller to rotate. The magnetic assembly is disposed within the hub and around the stator structure. The magnetic assembly includes a magnet and a magnetically permeable shell. The bearing structure includes a bearing seat and a single ball bearing. The single ball bearing is disposed in the bearing seat and forms an accommodating space, and the rotational shaft is disposed in the accommodating space.
    Type: Grant
    Filed: May 20, 2014
    Date of Patent: October 3, 2017
    Assignee: DELTA ELECTRONICS, INC.
    Inventors: Chao-Wen Lu, Chun-Chih Wang
  • Patent number: 9747953
    Abstract: A base member of a disk drive apparatus includes a window portion, a first groove, and a communicating groove. The window portion passes through a bottom plate portion of the base member in an axial direction. The first groove is defined in an upper surface of the bottom plate portion around the window portion. A connector includes a board portion and an electrode terminal on a lower surface of the board portion. The board portion is on the upper surface of the bottom plate portion to cover the window portion, the first groove, and a portion of the communicating groove. The communicating groove extends from the first groove up to a position outside of an outer circumferential portion of the connector. An adhesive layer is between the upper surface of the bottom plate portion and the lower surface of the board portion.
    Type: Grant
    Filed: February 7, 2017
    Date of Patent: August 29, 2017
    Assignee: NIDEC CORPORATION
    Inventors: Takumi Shimomura, Shingo Suginobu
  • Patent number: 9698637
    Abstract: A rotating portion of a motor includes a magnet, a yoke, and a hub. An upper portion of the yoke is fixed to the hub. The yoke includes a first inner circumferential surface radially opposite to an outer circumferential surface of the magnet with a first gap intervening therebetween, and a second inner circumferential surface radially opposite to the outer circumferential surface of the magnet with a second gap intervening therebetween below the first inner circumferential surface. The second inner circumferential surface is parallel or substantially parallel to the outer circumferential surface of the magnet, and is located radially outward of the first inner circumferential surface. An adhesive is provided in at least a portion of the first gap. No adhesive is provided in at least a lower axial end portion of the second gap.
    Type: Grant
    Filed: April 22, 2015
    Date of Patent: July 4, 2017
    Assignee: NIDEC CORPORATION
    Inventors: Shunichi Ochitani, Wataru Yamauchi, Masayuki Maeda
  • Patent number: 9692273
    Abstract: A rotating portion of a spindle motor includes a rotor magnet, a circular plate portion, and an annular raised portion that projects downward from the circular plate portion. A stationary portion includes a stator, a base portion, and an annular recessed portion configured to accommodate the raised portion. The raised portion includes an inner circumferential surface and an outer circumferential surface. The inner circumferential surface is positioned radially opposite a first side surface of the recessed portion with a first minute gap intervening therebetween. The outer circumferential surface is positioned radially opposite a second side surface of the recessed portion with a second minute gap intervening therebetween. The first minute gap has an axial dimension greater than an axial dimension of a seal portion.
    Type: Grant
    Filed: June 9, 2014
    Date of Patent: June 27, 2017
    Assignee: NIDEC CORPORATION
    Inventors: Yoichi Sekii, Kazuya Enokizono
  • Patent number: 9640207
    Abstract: In order to prevent leaking of lubricant, the bearing device includes a rolling bearing having an outer ring and an inner ring, a shaft fixed to the inner ring, and a sleeve fixed to the outer ring. A flange part is formed on at least one end part of the shaft. The flange part includes a disk part extending from the shaft toward an outside in a radial direction and a cylindrical part extending from the disk part along an axial direction. The cylindrical part is disposed at an outside of the outer ring, and a labyrinth gap which bends at two places is formed by gaps.
    Type: Grant
    Filed: March 7, 2016
    Date of Patent: May 2, 2017
    Assignee: MINEBEA CO., LTD.
    Inventor: Kunihiro Tsuchiya
  • Patent number: 9424887
    Abstract: Various aspects of the present disclosure are directed toward a disc drive apparatus including a disc drive actuator assembly, and a vapor-trapping pathway. The vapor-trapping pathway, in certain embodiments, is formed by an inner surface of an eblock, outer surface of a pivot shaft, and first and second shields. The vapor-trapping pathway being designed to mitigate the flow of vapor into an interior enclosure of the disc drive from within a ball-bearing cartridge.
    Type: Grant
    Filed: April 22, 2015
    Date of Patent: August 23, 2016
    Assignee: Seagate Technology LLC
    Inventor: Mark Dubé
  • Patent number: 9413210
    Abstract: A rotor type brushless motor comprises a drive magnet having an indexing pole part that extends on one axial side thereof. This indexing pole part is formed at least in the range from the circumferential center of one north pole to the circumferential center of one adjacent south pole, and over no greater than the range from one circumferential end of the one north pole to the other circumferential end of the one south pole. A magnetic flux detector is arranged at a position axially facing the indexing pole part.
    Type: Grant
    Filed: June 24, 2014
    Date of Patent: August 9, 2016
    Assignee: Tokyo Parts Industrial Co., Ltd.
    Inventor: Masahisa Tuchiya
  • Patent number: 9368149
    Abstract: In a motor, a lower thrust portion is defined by a flange portion extending radially outward from an outer circumferential surface of a shaft portion of a shaft and a plate portion extending radially inward from an inner circumferential surface of a cylindrical wall of a bearing cup portion which axially overlap with each other. The flange portion and the plate portion include a first adhesive portion radially opposed thereto and a second adhesive portion axially opposed thereto. An adhesive is located in each of the first adhesive portion and the second adhesive portion such that the shaft and the bearing cup portion have excellent bonding strength to withstand an axial load.
    Type: Grant
    Filed: October 27, 2014
    Date of Patent: June 14, 2016
    Assignee: Nidec Corporation
    Inventor: Junya Mizukami
  • Patent number: 9369019
    Abstract: 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.
    Type: Grant
    Filed: August 26, 2015
    Date of Patent: June 14, 2016
    Assignee: Nidec Corporation
    Inventor: Hiroyuki Abe
  • Patent number: 9361929
    Abstract: A disk clamp for clamping a plurality of disks within a disk drive has a single fastening hole located at its symmetrical center sized to pass the shaft of a screw having a head diameter larger than the fastening hole. The screw fastens the disk clamp to a motor hub supporting the plurality of disks. The disk clamp has a moat around the fastening hole, at a maximum diameter that is smaller than the head diameter of the head on the fastening screw. The moat may be circular, have spike trenches angled toward the fastening hole, or be spiral. The diameter of the spiral moat decreases in a clockwise or counterclockwise direction toward the fastening hole. The midsection of the disk which the screw head covers is biased at a negative angle toward the fastening hole forcing particles generated during assembly toward the fastening hole of the disk clamp.
    Type: Grant
    Filed: January 27, 2014
    Date of Patent: June 7, 2016
    Assignee: INTRI-PLEX TECHNOLOGIES, INC.
    Inventors: David M. Erlach, Frederic C. Petersen, Ryan J. Schmidt, Paul W. Smith, Adam D. Sutton, Robert J. Tench
  • Patent number: 9336817
    Abstract: A spindle motor is used in a disk drive apparatus including a cover member to be attached to the spindle motor. The spindle motor includes a rotor portion; a bearing portion; a stator portion; a base portion molded by casting, and arranged to contain the rotor portion, the bearing portion, and the stator portion; and a screw attachment member fixed to the base portion, and including a screw hole. The base portion includes a plate portion arranged to extend radially with respect to a central axis, and a wall portion arranged to extend in an axial direction from a radially outer edge of the plate portion. The wall portion is arranged to support at least a portion of the cover member. An inside surface of the base portion includes a metal surface subjected to a cutting process. The screw attachment member is arranged on the wall portion.
    Type: Grant
    Filed: August 26, 2015
    Date of Patent: May 10, 2016
    Assignee: Nidec Corporation
    Inventor: Toshihiro Hirasawa
  • Patent number: 9219386
    Abstract: A motor's stator unit includes a base and a stator. The base has a shaft tube. The stator has a silicon steel plate unit, an insulation sleeve unit and a coil unit. The silicon steel plate unit has an inner circumferential wall forming a through-hole. The insulation sleeve unit has an engagement hole. The silicon steel plate unit and the insulation sleeve unit are stacked together. The through-hole and the engagement hole are aligned with each other to allow the shaft tube to extend through the through-hole and the engagement hole. An enameled copper wire is wound around a predetermined part of the insulation sleeve unit to form the coil unit. The insulation sleeve unit is press fitted around an outer circumferential wall of the shaft tube via at least one buffering member, so as to prevent the silicon steel plate unit from excessively compressing the shaft tube.
    Type: Grant
    Filed: June 11, 2013
    Date of Patent: December 22, 2015
    Assignee: Sunonwealth Electric Machine Industry Co., Ltd.
    Inventor: Alex Horng
  • Patent number: 9202512
    Abstract: 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.
    Type: Grant
    Filed: August 31, 2012
    Date of Patent: December 1, 2015
    Assignee: Marvell International LTD.
    Inventors: Chao Bi, Kui Cai, Kheong Sann Chan, Zhi Yong Ching, Moulay Rachid Elidrissi, Guchang Han, Zhimin He, Phyu Hla Nu, Jiang Feng Hu, Wei Hua, Quan Jiang, Siang Huei Leong, Wuzhong Lin, Bo Liu, Yansheng Ma, Chun Lian Ong, Jianzhong Shi, Cheng Su Soh, Sufui Sophia Tan, Li Wang, Chiew Leong Wong, Weiya Xi, Khai Leong Yong, Shengkai Yu, Yin Quan Yu, Zhimin Yuan, Jing Liang Zhang, Tiejun Zhou, Pantelis Alexopoulos, Budi Santoso, Qide Zhang, Kannan Sundaravadivelu, Ningyu Liu, Jianqiang Mou, Chong Wee Lee, Ke Gan, Boon Long Ibrahim See, Leonard Gonzaga, Wee Kiat Lim, Mengjun Liu, Venkataramanan Venkatakrishnan, Cheng Peng Tan
  • Patent number: 9196292
    Abstract: A rotary spindle has a rotatable shaft that defines a shaft axis of rotation, and has a shaft top land that is normal to the shaft axis of rotation. A disk mounting hub has an outer disk mounting surface, and has an inner cylindrical bore with an inner cylindrical surface that faces and is in radial compression with an outer cylindrical surface of the shaft at a cylindrical hub-to-shaft interface. The cylindrical hub-to-shaft interface is substantially concentric about the shaft axis of rotation. A disk clamp is fastened to the rotatable shaft, and the disk clamp has a clamp bottom land that faces and is in contact with the shaft top land.
    Type: Grant
    Filed: February 5, 2015
    Date of Patent: November 24, 2015
    Assignee: Western Digital Technologies, Inc.
    Inventors: Diep L. Nguyen, Ronald G. Ilagan, Klaus Kloeppel
  • Patent number: 9183876
    Abstract: A motor includes a rotor hub with a first horizontal surface, a cylindrical surface, a second horizontal surface, and a projecting portion. The first horizontal surface is located above the sleeve. The cylindrical surface extends downward from the first horizontal surface. The second horizontal surface is located above a stator. The projecting portion projects downward from the second horizontal surface, and surrounds the sleeve or the holding portion. The cylindrical surface and an outer circumferential surface of the sleeve together define a tapered gap therebetween where the radial distance therebetween decreases with increasing height. The holding portion, the projecting portion, and coils are located radially in this order, and at least portions thereof are positioned to radially overlap with one another.
    Type: Grant
    Filed: January 14, 2015
    Date of Patent: November 10, 2015
    Assignee: Nidec Corporation
    Inventor: Yoichi Sekii
  • Patent number: 9165594
    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: Grant
    Filed: August 13, 2014
    Date of Patent: October 20, 2015
    Assignee: Nidec Corporation
    Inventors: Atsushi Yawata, Hirotoshi Uchibori, Toshihiro Akiyama
  • Patent number: 9166452
    Abstract: A spindle motor includes a base portion, a stationary portion, and a circuit substrate disposed in the base portion. The base portion includes a flat plate portion positioned below the rotary portion and a through-hole extending from an upper surface to a lower surface of the flat plate portion. The flat plate portion includes a first surface positioned between the upper surface and the lower surface of the flat plate portion and disposed within the through-hole. The circuit substrate includes a land portion to which a lead wire extending from a plurality of coils is electrically connected. The land portion is disposed on the first surface. The lead wire is connected to the land portion by solder within the through-hole.
    Type: Grant
    Filed: March 6, 2015
    Date of Patent: October 20, 2015
    Assignee: Nidec Corporation
    Inventors: Takashi Endo, Atsushi Yawata
  • Patent number: 9135947
    Abstract: There are provided a spindle motor and a hard disk drive including the same. The spindle motor includes a shaft fixedly installed on a base member and including an upper thrust member, a sleeve rotatably supported by the shaft, a hub extended from the sleeve in an outer diameter direction, and a sealing cap mounted on the hub, wherein the upper thrust member and the sleeve or the hub include a liquid-vapor interface formed therebetween, wherein a gap between facing surfaces of the sealing cap and the upper thrust member in the axial direction is narrow enough to form a labyrinth seal, and wherein the sealing cap includes a curved part curved so that a gap between the sealing cap and the upper thrust member at a portion of the sealing cap facing the upper thrust member in the axial direction is varied in a radial direction.
    Type: Grant
    Filed: April 9, 2013
    Date of Patent: September 15, 2015
    Assignee: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventors: Kwan Soo Yun, Shin Young Cheong, Ta Kyoung Lee, Song Bon Oh
  • Patent number: 9135945
    Abstract: A disk rotating motor is provided with: a stator including a stator core and a bracket for fixing the stator core; a rotor that can be rotated with respect to the stator and includes a rotary shaft; and a bearing that rotatably supports the rotary shaft on the outer diameter side of the rotary shaft, the bearing being supported by the bracket. The bracket includes a cylindrical portion extending along the rotary shaft, and a folded portion formed by folding the upper end of the cylindrical portion onto the outer diameter side such that at least a coaxial part of the folded portion extends coaxially along an outer surface of the cylindrical portion. The cylindrical portion and the folded portion are sandwiched by the stator core and the bearing in a radial direction.
    Type: Grant
    Filed: March 6, 2014
    Date of Patent: September 15, 2015
    Assignee: MINEBEA CO., LTD.
    Inventors: Tsuyoshi Ishida, Okihisa Tsuchie, Toshiyuki Nishikata
  • Patent number: 9118222
    Abstract: The outer rotor-type blushless motor comprises: a stator including a cylindrical housing, a stator core having stator pole teeth and a bearing coaxially incorporated in a cylindrical hole of the hosing; and a rotor including a rotor yoke, a rotor hub provided to the rotor yoke and a rotor shaft rotatably supported by the bearing. A first resin washer, through which the rotor shaft is pierced and which contacts an end face of the rotor hub, and a second resin washer, which contacts an end face of the bearing incorporated in a center hole of the stator core, contact each other. The second resin washer has an elastic projected section fitted in a concave section formed in the center hole of the stator core.
    Type: Grant
    Filed: January 11, 2013
    Date of Patent: August 25, 2015
    Assignee: SHINANO KENSHI KABUSHIKI KAISHA
    Inventor: Fumihiro Okamura
  • Patent number: 9091302
    Abstract: A bearing with a magnetic fluid seal, wherein a plurality of rolling elements are interposed between an inner ring and an outer ring, and a ring-shaped magnet is arranged at an opening side of the inner and outer rings so as to retain magnetic fluid for sealing the plurality of rolling elements, and wherein the ring-shaped magnet is magnetized such that magnetic poles are oriented in an axial direction, the bearing comprising: a ring-shaped pole plate arranged so as to be in contact with an outer side surface of the ring-shaped magnet in the axial direction; outer-ring-side magnetic fluid retained between the outer ring and the ring-shaped pole plate and/or between the outer ring and the ring-shaped magnet; and inner-ring-side magnetic fluid retained between the inner ring and the ring-shaped pole plate and/or between the inner ring and the ring-shaped magnet.
    Type: Grant
    Filed: April 16, 2013
    Date of Patent: July 28, 2015
    Assignee: GLOBERIDE, Inc.
    Inventor: Takeshige Ohara
  • Patent number: 9086858
    Abstract: A disk drive can include an enclosure and a media disk rotatably mounted to the enclosure via a spindle. A fluid dynamic bearing (FDB) can be mounted between the enclosure and the spindle of the media disk. The FDB may include an integrally formed shaft and lower thrust bush formed together from a single material.
    Type: Grant
    Filed: November 26, 2013
    Date of Patent: July 21, 2015
    Assignee: HGST NETHERLANDS B.V.
    Inventors: Toshiki Hirano, Lidu Huang, Chiao-Ping Ku, Gwo-Jeng Lo
  • Patent number: 9082450
    Abstract: A spindle motor includes a stationary portion and a rotating portion. The stationary portion includes a base member, a stator core, coils, and a circuit board. The base member includes a middle region, a peripheral region, jetty portions, a recessed portion, and at least one through hole. The jetty portions are positioned at least axially below the peripheral region, and include a pair of extension portions. The recessed portion is arranged inside the jetty portions, and a portion of the circuit board is arranged in the recessed portion. The at least one through hole is arranged to pass through the middle region in an axial direction. The recessed portion is covered with a sealant.
    Type: Grant
    Filed: July 24, 2014
    Date of Patent: July 14, 2015
    Assignee: Nidec Corporation
    Inventors: Yuji Kosakamoto, Taisuke Kanemasa, Masaaki Nakagawa
  • Patent number: 9065315
    Abstract: A rotating portion of a motor includes a magnet, a yoke including a yoke cylindrical portion, and a hub including a hub cylindrical portion. A first radial gap, which is a radial gap between the magnet and the yoke cylindrical portion, is filled with an adhesive from an upper axial end to an axial middle portion thereof, and includes a tapered gap gradually increasing in radial width with decreasing height. An upper axial end of the tapered gap is located above the axial middle portion of the first radial gap. In addition, no adhesive is provided from a lower axial end to an axial middle portion of a second radial gap, which is a radial gap between the yoke cylindrical portion and the hub cylindrical portion.
    Type: Grant
    Filed: December 15, 2014
    Date of Patent: June 23, 2015
    Assignee: Nidec Corporation
    Inventors: Shunichi Ochitani, Wataru Yamauchi, Masayuki Maeda
  • Patent number: 9047911
    Abstract: 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.
    Type: Grant
    Filed: May 21, 2014
    Date of Patent: June 2, 2015
    Assignee: SAMSUNG ELECTRO-MECHANICS JAPAN ADVANCED TECHNOLOGY CO., LTD.
    Inventor: Ryusuke Sugiki
  • Publication number: 20150146322
    Abstract: 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.
    Type: Application
    Filed: August 31, 2012
    Publication date: May 28, 2015
    Applicant: AGENCY FOR SCIENCE, TECHNOLOGY AND RESEARCH
    Inventors: Chao Bi, Kui Cai, Kheong Sann Chan, Zhi Yong Ching, Moulay Rachid Elidrissi, Guchang Han, Zhimin He, Phyu Hla Nu, Jiang Feng Hu, Wei Hua, Quan Jiang, Siang Huei Leong, Wuzhong Lin, Bo Liu, Yansheng Ma, Chun Lian Ong, Jianzhong Shi, Cheng Su Soh, Sufui Sophia Tan, Li Wang, Chiew Leong Wong, Weiya Xi, Khai Leong Yong, Shengkai Yu, Yin Quan Yu, Zhimin Yuan, Jing Liang Zhang, Tiejun Zhou, Pantelis Alexopoulos, Budi Santoso, Qide Zhang, Kannan Sundaravadivelu, Ningyu Liu, Jianqiang Mou, Chong Wee Lee, Ke Gan, Boon Long Ibrahim See, Leonard Gonzaga, Wee Kiat Lim, Mengjun Liu, Venkataramanan Venkatakrishnan, Cheng Peng Tan
  • Publication number: 20150146323
    Abstract: 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.
    Type: Application
    Filed: January 30, 2015
    Publication date: May 28, 2015
    Inventors: Kenichiro YAMADA, Katsuhiko KOUI
  • Publication number: 20150146324
    Abstract: 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.
    Type: Application
    Filed: January 30, 2015
    Publication date: May 28, 2015
    Inventors: Kenichiro YAMADA, Katsuhiko KOUI
  • Publication number: 20150138670
    Abstract: 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.
    Type: Application
    Filed: January 28, 2015
    Publication date: May 21, 2015
    Inventors: Kazuhiro SATO, Masahiro SHIRAISHI, Takayuki ISHINO, Akihiro YUDATE, Takuro MATSUMOTO, Toshihiro AKIYAMA
  • Publication number: 20150138669
    Abstract: 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.
    Type: Application
    Filed: February 26, 2014
    Publication date: May 21, 2015
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventor: Masaya KUDO
  • Patent number: 9035516
    Abstract: There are provided a hydrodynamic bearing assembly and a motor including the same. The hydrodynamic bearing assembly includes a sleeve rotatably supporting a shaft and including a first circulation hole formed therein, the first circulation hole penetrating between an inner peripheral surface thereof and an outer peripheral surface thereof; a sleeve housing into which the sleeve is inserted; and a second circulation hole formed between the outer peripheral surface of the sleeve and an inner peripheral surface of the sleeve housing to be in communication with the first circulation hole, wherein an upper portion of the second circulation hole has a larger diameter than a lower portion thereof in an axial direction.
    Type: Grant
    Filed: March 5, 2013
    Date of Patent: May 19, 2015
    Assignee: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventors: Myeung Hwa Heo, Won Ki Park, Satoru Sodeoka
  • Patent number: 9030775
    Abstract: 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.
    Type: Grant
    Filed: May 10, 2011
    Date of Patent: May 12, 2015
    Assignee: Samsung Electro-Mechanics Japan Advanced Technology Co., Ltd.
    Inventors: Takanori Watanabe, Takuji Yamada, Susumu Ando, Hiroshi Iwai
  • Publication number: 20150124352
    Abstract: 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.
    Type: Application
    Filed: November 4, 2013
    Publication date: May 7, 2015
    Applicant: HGST Netherlands B.V.
    Inventors: Edgar Dennis Rothenberg, Yiduo Zhang
  • Patent number: 9025284
    Abstract: A disk drive enclosure includes a cover and a base having a first hole therethrough. A head actuator is pivotably attached to the base by an actuator pivot bearing having a pivot bearing shaft with a lower internally threaded section and a flat annular support surface that is facing and in preloaded contact with a flat mating surface of the disk drive base around the first hole. A bearing member is disposed around the pivot bearing shaft and between the pivot bearing shaft and the bore of the actuator. A first screw has an externally threaded section that is engaged with the lower internally threaded section of the pivot bearing shaft. The first screw has a screw head with an external annular seating surface in contact with and forming a continuous annular seal with an internal annular seating surface of the first hole.
    Type: Grant
    Filed: May 16, 2014
    Date of Patent: May 5, 2015
    Assignee: Western Digital Technologies, Inc.
    Inventors: Kevin R. Sill, Aaron D. Little
  • Publication number: 20150116865
    Abstract: 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.
    Type: Application
    Filed: October 20, 2014
    Publication date: April 30, 2015
    Inventor: Masafumi MIZUNO
  • Patent number: 9019656
    Abstract: 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.
    Type: Grant
    Filed: March 4, 2014
    Date of Patent: April 28, 2015
    Assignee: Samsung Electro-Mechanics Japan Advanced Technology Co., Ltd.
    Inventors: Mitsuo Kodama, Ryusuke Sugiki
  • Publication number: 20150109702
    Abstract: 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.
    Type: Application
    Filed: March 31, 2014
    Publication date: April 23, 2015
    Applicant: Western Digital (Fremont), LLC
    Inventors: SHAOPING LI, YUANKAI ZHENG, GERARDO A. BERTERO, QUNWEN LENG, MICHAEL L. MALLARY, RONGFU XIAO, MING MAO, ZHIHONG ZHANG, ANUP G. ROY, CHEN JUNG CHIEN, ZHITAO DIAO, LING WANG
  • Patent number: 9013829
    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: Grant
    Filed: May 1, 2014
    Date of Patent: April 21, 2015
    Assignee: Nidec Corporation
    Inventor: Akinobu Sumiji
  • Patent number: 9007716
    Abstract: A spindle motor for a disk drive including a hub defining a longitudinal axis having a hub flange defining a mounting surface extending substantially normal to the longitudinal axis, wherein the hub flange of the hub extends longitudinally relative to the mounting surface to define a vertical surface; and a motor base coupled to the hub proximate to the hub flange of the hub, the motor base having a central axis substantially aligned with the longitudinal axis, wherein the motor base extends longitudinally, wherein a radius of the motor base is greater than a radius of the hub flange of the hub.
    Type: Grant
    Filed: July 31, 2014
    Date of Patent: April 14, 2015
    Assignee: Western Digital Technologies, Inc.
    Inventor: Mitchell D. Dougherty
  • Patent number: 9001461
    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: Grant
    Filed: August 13, 2014
    Date of Patent: April 7, 2015
    Assignee: Nidec Corporation
    Inventor: Atsushi Yawata
  • Patent number: 9001459
    Abstract: A stator includes a stator core and a plurality of coils. The stator core includes a core-back and a plurality of teeth portions. Each of the teeth portions includes a coil winding portion, a tip end portion, and an increased width portion. The tip end portion has a circumferential width larger than a smallest width of the coil winding portion. The increased width portion has a circumferential width larger than the smallest width of the coil winding portion. The increased width portion includes a slanted portion extending radially outward and upward. An axial position of a magnetic center of the rotor magnet positioned radially outward of the stator overlaps with an axially extending range of the tip end portion. A thickness of the slanted portion in a direction perpendicular to an upper surface of the slanted portion is smaller than an axial thickness of the coil winding portion.
    Type: Grant
    Filed: August 15, 2012
    Date of Patent: April 7, 2015
    Assignee: Nidec Corporation
    Inventors: Hiroyuki Abe, Takehito Tamaoka, Kazuhiro Sato
  • Patent number: 9001460
    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: Grant
    Filed: July 14, 2014
    Date of Patent: April 7, 2015
    Assignee: Nidec Corporation
    Inventors: Hironori Ando, Mitsuhiro Takemoto