Rotational Drive Detail Patents (Class 360/99.08)
  • Patent number: 8334625
    Abstract: A storage disk drive motor 12 includes a stator unit 2, a rotor unit 3, a shaft 41 arranged in a coaxial relationship with a center axis 9, a sleeve unit 22 including a flange portion 223, and a base member 21, having a through-hole, fixed to the sleeve unit 22 by caulking. The flange portion 223 includes a flange lower surface 223b making contact with an upper surface 21a of the base member 21 and a jut 24 protruding downwards from a radial inner side of the flange lower surface 223b. The jut 24 includes a first outer circumferential surface 241 opposed to the inner circumferential surface 21c of the base member 21, a second outer circumferential surface 242 positioned below the first outer circumferential surface 241, and a groove 243 radially inwardly indented from the first outer circumferential surface 241 and the second outer circumferential surface 242.
    Type: Grant
    Filed: March 29, 2010
    Date of Patent: December 18, 2012
    Assignee: Nidec Corporation
    Inventors: Hitoshi Takaki, Tatsuya Tatara, Hiroaki Inamori
  • Patent number: 8324767
    Abstract: A spindle motor structure is disclosed having a structure incorporating a spindle motor, a driving substrate, and a base on which the spindle motor and the driving substrate are installed. The spindle motor includes a stator having a core wound with a coil and a rotor rotating about the stator. The driving substrate is aligned at an outer periphery of the rotor and soldered with driving control parts of the spindle motor including a plurality of circuit parts including a driving integrated circuit and the like. The spindle motor is assembled with or dissembled from the base independently from the driving substrate.
    Type: Grant
    Filed: December 17, 2009
    Date of Patent: December 4, 2012
    Assignee: LG Innotek Co., Ltd.
    Inventor: Myung Seok Lee
  • Patent number: 8324771
    Abstract: A spindle motor includes a stator unit and a rotor unit supported to be rotatable with respect to the stator unit. The stator unit includes a stator, a base portion including a through hole, and a circuit board. The circuit board includes a connection portion to which a conductive wire from the stator is connected after passing through the through hole, and an extending portion arranged to extend from the connection portion. A lower surface of the base portion includes a recess portion arranged to accommodate the connection portion, and a groove portion arranged to extend from the recess portion to have the extending portion arranged therein. A bottom surface of the groove portion includes a protrusion portion arranged to protrude downwards.
    Type: Grant
    Filed: August 4, 2010
    Date of Patent: December 4, 2012
    Assignee: Nidec Corporation
    Inventors: Atsushi Yawata, Yasuhiro Suzuki, Shintaro Saeki, Takehito Tamaoka
  • Patent number: 8324776
    Abstract: A spindle motor includes a shaft arranged in an upward/downward direction along a central axis; a base member including a substantially cylindrical holder portion arranged around the central axis; a bearing unit arranged radially inward of the holder portion; and a rotating portion arranged above the base member to rotate about the central axis. The rotating portion preferably includes a mounting surface on which a disk is to be mounted. An adhesive containing an electrically conductive material and an adhesive containing an externally stimulated curing material and/or an anaerobic curing material are arranged in a clearance space defined between an inner circumferential surface of the holder portion and an outer circumferential surface of the bearing unit. The adhesive containing the electrically conductive material is arranged above the adhesive containing the externally stimulated curing material and/or the anaerobic curing material.
    Type: Grant
    Filed: January 14, 2010
    Date of Patent: December 4, 2012
    Assignee: Nidec Corporation
    Inventors: Takehito Tamaoka, Tsuchitsugu Watanabe, Takashi Yamamoto
  • Publication number: 20120300345
    Abstract: A voice coil motor for a disk drive unit includes an external magnet and an actuator coil movably located above the external magnet. The external magnet has a main body with a magnetic north pole, a magnetic south pole and a transition surface therebetween, and further has a protrusion extending from the center part of the main body for increasing torque force, thereby improving the performance of the voice coil motor. The invention also discloses a disk drive unit including the same.
    Type: Application
    Filed: July 11, 2011
    Publication date: November 29, 2012
    Applicant: SAE Magnetics (H.K.) Ltd.
    Inventors: Daisuke SHIRATO, Da qing HUANG, Huan yin ZHONG
  • Publication number: 20120300346
    Abstract: There is provided a motor including: a rotating member rotating together with a shaft and including an extension part extended along an outer surface of the shaft; a fixed member including a shaft support part supporting the shaft and an extension part support part supporting the extension part; and an oil storage part disposed between a lower surface of the extension part and the fixed member to thereby provide an oil storage space.
    Type: Application
    Filed: May 18, 2012
    Publication date: November 29, 2012
    Applicant: Samsung Electro-Mechanics Co., Ltd.
    Inventor: Young Ha PARK
  • Patent number: 8315011
    Abstract: A disk drive device includes a bearing unit and a drive unit. The bearing unit includes: a shaft; a sleeve configured to allow relative rotation, with the shaft as the axis; a flange projected in the radial direction of the shaft and configured to rotate integrally with the shaft; a flange housing space portion provided continuously from the sleeve and configured to rotatably house the flange; a counter plate structured with both a first surface, which faces the end surface in the axial direction of the flange and seals the flange housing space portion, and a second surface that is opposite to the first surface. The projected dimension of the flange is designed to be larger than the wall thickness of the flange surrounding wall portion in the radial direction of the flange, the flange surrounding wall portion defining the flange housing space portion.
    Type: Grant
    Filed: April 28, 2010
    Date of Patent: November 20, 2012
    Assignee: Alphana Technology Co., Ltd.
    Inventor: Yuji Nishitani
  • Patent number: 8315012
    Abstract: A spindle motor for use in a disk drive apparatus includes stationary and rotating portions. The stationary portion includes a shaft including a thrust plate. A sleeve portion includes an axial end surface arranged opposite the thrust plate. A first seal member is arranged opposite the thrust plate on an opposite side with respect to the sleeve portion. The thrust plate preferably includes a plate communicating hole arranged to connect first and second thrust gaps defined, respectively, between the thrust plate and the sleeve portion and between the thrust plate and the first seal member. The sleeve portion preferably includes a sleeve communicating hole arranged to connect the first thrust gap with an opposite axial side thereof. A lubricant is arranged to fill a communicating channel extending from a first to a second capillary seal portion through the plate communicating hole and the sleeve communicating hole.
    Type: Grant
    Filed: March 28, 2011
    Date of Patent: November 20, 2012
    Assignee: Nidec Corporation
    Inventors: Toshikazu Himeno, Shozo Tagata, Shinya Yano, Wataru Yamauchi, Akihiro Yudate
  • Publication number: 20120287534
    Abstract: A reader sensor comprises a first shielding layer, a second shielding layer, a read element formed therebetween, and a pair of permanent magnet layer respectively placed on two sides of the read element; and it further comprises a magnetic field generating means formed beside the read element and arranged for providing a magnetic field with a direction perpendicular to the first shielding layer and the second shielding layer, thereby stabilizing the reading performance of the reader sensor. The invention can stabilize the reading performance, ameliorate the unstable defective reader sensor, and decrease the waste and the manufacturing cost. The present invention also discloses a magnetic head, a HGA and a disk drive unit.
    Type: Application
    Filed: May 12, 2011
    Publication date: November 15, 2012
    Applicant: SAE Magnetics (H.K.) Ltd.
    Inventors: Chiuming Lueng, Mankit Lee, Cheukwing Leung, Juren Ding, Rongkwang Ni
  • Patent number: 8308365
    Abstract: A robust spindle motor is provided having improved shock resistance for fluid containment, as well as enhanced air purging characteristics. In an aspect, axial displacement of relatively rotating components is restricted by utilizing a limiter situated adjacent to a limiter bushing forming an axial limiter gap therebetween. A fluid channel, at least partially diverging, extends from a hydrodynamic bearing to the axial limiter gap, and continues to a region beyond the axial limiter gap. In an aspect, an axially diverging slot is situated adjacent to the axial limiter gap. Power is reduced by reducing viscous drag between relatively rotating components, hydrodynamic bearing length is increased, and higher stiffness of the hydrodynamic bearing is provided. Fluid volume may be increased, thereby offsetting fluid evaporation losses and allowing for the use of lower viscosity lubricants.
    Type: Grant
    Filed: May 25, 2010
    Date of Patent: November 13, 2012
    Assignee: Seagate Technology LLC
    Inventors: Anthony J. Aiello, Christopher M. Woldemar, Norbert S. Parsoneault, Alan L. Grantz
  • Publication number: 20120275055
    Abstract: A hard disk drive of the invention comprises: a housing comprising a base and a cover; an insert positioned on an interior surface of the base of the housing for stabilization of one or more components within the hard disk drive during operation of the hard disk drive, wherein the insert is relatively stiff as compared to stiffness of the base; and the at least one of the one or more components mounted on the insert. Methods for forming such hard disk drives and hard disk drive rack assemblies comprising the hard disk drives are also disclosed.
    Type: Application
    Filed: April 28, 2011
    Publication date: November 1, 2012
    Applicant: ENTROTECH, INC.
    Inventor: James E. McGuire, JR.
  • Patent number: 8300355
    Abstract: A fluid dynamic bearing includes an auxiliary bearing portion, a first radial bearing portion and a second radial bearing portion arranged along an axial direction of the fluid dynamic bearing, wherein the auxiliary groove formed in the auxiliary bearing portion is shallower in depth than the radial dynamic pressure groove formed in the first radial bearing portion, and wherein a gap size in the auxiliary bearing portion is set to be equal to or larger than a gap size in the radial bearing portions.
    Type: Grant
    Filed: August 23, 2010
    Date of Patent: October 30, 2012
    Assignee: Minebea Co., Ltd.
    Inventor: Weihong Yang
  • Patent number: 8300345
    Abstract: Method and apparatus for providing a storage medium with variable track widths. In accordance with various embodiments, a data storage medium is rotated by a motor. A write transducer is used to write concentric data tracks to the storage medium during said rotation. The tracks are provided with variable track widths established by selectively changing a rotational velocity of the medium. The variable track widths can be gradual and/or abrupt, depending on the requirements of a given application. Gradual variations in track width can be used by a linear actuator with a linear translation path to emulate tracks written along a pivot translation path of a rotary actuator. Abrupt variations in track width can be used to provide different zones of tracks having different specified track widths. The tracks may be written using an electron beam recorder (EBR) with a constant write beam power level.
    Type: Grant
    Filed: December 4, 2009
    Date of Patent: October 30, 2012
    Assignee: Doug Carson & Associates, Inc.
    Inventor: Douglas M. Carson
  • Publication number: 20120262820
    Abstract: According to one embodiment, a magnetic head includes a main pole configured to apply a recording magnetic field to a recording layer of a recording medium, a return pole opposed to the main pole with a write gap therebetween, and a high-frequency oscillator between respective facing surfaces of the main pole and the return pole and configured to produce a high-frequency magnetic field. At least one of the main and return poles faces the high-frequency oscillator and includes a laminated structure portion includes a magnetic layer and a nonmagnetic layer laminated to one another.
    Type: Application
    Filed: November 14, 2011
    Publication date: October 18, 2012
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Takuya MATSUMOTO, Kenichiro YAMADA, Masayuki TAKAGISHI, Katsuhiko KOUI, Hitoshi IWASAKI
  • Publication number: 20120262823
    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: June 22, 2012
    Publication date: October 18, 2012
    Applicant: ALPHANA TECHNOLOGY CO., LTD.
    Inventors: Takanori WATANABE, Hiroshi IWAI, Tomoyuki TASHIRO
  • Publication number: 20120262822
    Abstract: A sleeve supports a shaft. A housing member is arranged so as to surround the sleeve and make the end of the sleeve protrude. A base member holds the housing member and fixes a stator core so as to surround the housing member. A hub drives a recording disk by being rotated integrally with the shaft, with a magnet being fixed to an annular portion concentric with the shaft so as to face the stator core fixed to the base member. A thrust member is rotated integrally with the hub, and a descender portion and a ring portion.
    Type: Application
    Filed: June 22, 2012
    Publication date: October 18, 2012
    Applicant: ALPHANA TECHNOLOGY CO., LTD.
    Inventors: Takuji YAMADA, Yuji OMURA, Mitsuo KODAMA
  • Publication number: 20120262821
    Abstract: According to one embodiment, a magnetic recording head includes a main pole configured to apply a recording magnetic field perpendicular to a recording medium, a trailing-shield pole opposed to the main pole with a recording gap therebetween, a high-frequency oscillator between the main pole and the trailing-shield pole in the recording gap, configured to produce a high-frequency magnetic field, a magnetic seed layer between the main pole and the high-frequency oscillator and in contact with the main pole, and a highly oriented magnetic layer of a soft magnetic material superposed on the magnetic seed layer between the main pole and the high-frequency oscillator and in contact with the high-frequency oscillator.
    Type: Application
    Filed: November 14, 2011
    Publication date: October 18, 2012
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Tomoko Taguchi, Masayuki Takagishi, Katsuhiko Koui, Kenichiro Yamada, Hitoshi Iwasaki
  • Patent number: 8284513
    Abstract: A bearing mechanism includes a shaft, a sleeve portion, a thrust portion, and a cover portion. Lubricating oil is arranged in a communicating channel in the sleeve portion, a thrust gap between the sleeve portion and the thrust portion, and a tapered gap between an outside surface of the thrust portion and the cover portion. A lower end opening of the communicating channel is defined in an outer circumferential portion of a lower surface of the sleeve portion radially outward of the thrust gap. A radially outermost portion of the thrust portion is arranged either tangent to a wall surface of the communicating channel or closer to a central axis than the wall surface. The tapered gap is arranged closer to the central axis than a radially outermost point of the wall surface. The outer circumferential portion and the cover portion define a guide gap therebetween.
    Type: Grant
    Filed: April 22, 2010
    Date of Patent: October 9, 2012
    Assignee: Nidec Corporation
    Inventors: Yoichi Sekii, Hironao Sasaki, Takuro Iguchi, Hironori Ando, Toshihiro Akiyama, Takunori Shinao, Yuichi Shigematsu
  • Patent number: 8284515
    Abstract: A fluid dynamic bearing mechanism includes a stationary shaft, a sleeve portion arranged to rotate with respect to the shaft, and a thrust portion including an upper end surface arranged oppose to a lower end surface of the sleeve portion. An inside surface of the thrust portion includes an inside surface contact portion arranged in contact with an outside surface of the shaft, and an inside surface lower non-contact portion spaced away from the outside surface of the shaft, and arranged to extend downward from a lower end of the inside surface contact portion. An outside surface of the thrust portion includes an outside surface inclined portion arranged in contact with an interface of a lubricating oil. The lower end of the inside surface contact portion is arranged at a level axially higher than that of a lower end of the outside surface inclined portion.
    Type: Grant
    Filed: August 4, 2011
    Date of Patent: October 9, 2012
    Assignee: Nidec Corporation
    Inventors: Yoichi Sekii, Hironao Sasaki, Takuro Iguchi, Hironori Ando, Toshihiro Akiyama, Takunori Shinao, Yuichi Shigematsu, Yasutaka Ino, Tatsuyoshi Nakatani
  • Patent number: 8284514
    Abstract: Disclosed is a clamp fastener that includes a convex head to prevent damage due to contact from a cover of a disk drive. The disk drive comprises a disk, a spindle motor, a disk clamp mounted to a top surface of the disk, and a clamp fastener. The clamp fastener includes a convex head. The clamp fastener is mounted through the disk clamp to connect the disk clamp and the disk to the spindle motor such that the spindle motor spins the disk, wherein the convex head is nearer to the cover than the disk clamp.
    Type: Grant
    Filed: June 28, 2010
    Date of Patent: October 9, 2012
    Assignee: Western Digital Technologies, Inc.
    Inventor: Jonathan M. Garbarino
  • Publication number: 20120250185
    Abstract: An electronic component container includes an electronic component; a holder including a holder base part and ribs standing on the holder base part to form a container of the electronic component; and a supporting plate including a supporting plate base part and fixed to the holder. Further, the holder further includes latch protrusions protruding from the ribs above the holder base part; the supporting plate includes cutout sections so as to avoid interference with the latch protrusions when the supporting plate base part is first placed on the holder base part at a mounting position; and the supporting plate base part is latched between the latch protrusions and the holder base part.
    Type: Application
    Filed: March 28, 2012
    Publication date: October 4, 2012
    Applicant: FUJITSU LIMITED
    Inventor: Masaki Ishikawa
  • Publication number: 20120250183
    Abstract: A motor includes a stationary portion and a rotating portion. The rotating portion includes a sleeve portion including one communicating hole arranged to extend completely there through from an upper surface to a lower surface thereof, and a cover portion including a hole portion. The axial extension range of the hole portion is arranged to overlap with the axial extension range of the communicating hole in a radial direction. A center of the hole portion is arranged on a plane including a central axis and a center of the communicating hole. The communicating hole and the hole portion are arranged on opposite sides of the central axis. The following inequality is satisfied: V2<(?1/?2)·V1, where ?1 is the density of the sleeve portion, V1 is the volume of the communicating hole, ?2 is the density of the cover portion, and V2 is the volume of the hole portion.
    Type: Application
    Filed: January 19, 2012
    Publication date: October 4, 2012
    Applicant: NIDEC CORPORATION
    Inventors: Takehito TAMAOKA, Kazushi MIURA, Mitsuhiro TAKEMOTO
  • Publication number: 20120250184
    Abstract: A housing member for use in a disk drive apparatus includes a rectangular bottom portion and a side wall portion arranged to extend upward from an outer circumferential portion of the bottom portion. The side wall portion includes four outside surfaces including a first outside surface and a second outside surface perpendicular or substantially perpendicular to the first outside surface. The first outside surface includes a first cutting base region. The second outside surface includes a second cutting base region. The bottom portion includes a bearing fixing portion arranged to fix a bearing mechanism of a motor arranged to rotate a disk.
    Type: Application
    Filed: March 19, 2012
    Publication date: October 4, 2012
    Applicant: NIDEC CORPORATION
    Inventors: Kiyofumi INOUE, Shozo TAGATA, Takahiro NAKAMURA, Koji BABA, Toshikazu HIMENO
  • Patent number: 8278796
    Abstract: A fan assembly includes a stator and a rotor. The stator is located in a fan frame and includes a base, at least one magnetizing winding provided on the base at a first relative position relative to a center of the base, and at least one magnetic conductive element provided on the base at a second relative position relative to the center of the base. The rotor is fixedly mounted in a fan hub, and has at least one positive pole and at least one negative pole, which are alternately arranged to constitute a magnetic induction face. The fan hub is rotatably connected to the fan frame via a shaft with the magnetic induction face facing toward the magnetizing winding and the magnetic conductive element on the base. With the above arrangements, the fan can have a largely reduced axial height for use in a limited space.
    Type: Grant
    Filed: November 16, 2009
    Date of Patent: October 2, 2012
    Assignee: Asia Vital Components Co., Ltd.
    Inventor: Sam Tang
  • Patent number: 8279553
    Abstract: A rolling bearing provided with a shield plate which hardly induces the irregular deformation of an outer ring without increasing a cost is provided. A rolling bearing includes an inner ring and an outer ring; a plurality of rolling bodies which are held between the inner ring and the outer ring in a rotatable manner; and an annular shield plate which is engageable with an engaging groove portion which is formed on an inner peripheral surface of the outer ring along the circumferential direction and opens toward an inner peripheral surface side and an open end side. The shield plate includes: an annular shield body; and a plurality of engaging projections which are arranged along the outer peripheral portion of the shield body, project outwardly in the radial direction from the outer peripheral portion in an inclined state, and are engageable with the engaging groove portion.
    Type: Grant
    Filed: June 9, 2011
    Date of Patent: October 2, 2012
    Assignee: Seiko Instruements Inc.
    Inventor: Haruhiko Hasegawa
  • Publication number: 20120243121
    Abstract: A disk drive includes a spindle motor attached to a disk drive base. The spindle motor includes a hub that rotates about a spindle rotation axis. An annular disk is mounted on the hub. A clamp contacts a top surface of the hub. The clamp includes first and second pluralities of openings therethrough. The clamp is attached to the hub by a plurality of fasteners, each of the plurality of fasteners passing through one of the first plurality of openings. Each of the second plurality of openings has a closed outer periphery within the clamp. Each of the first plurality of openings is disposed directly between the spindle rotation axis and a corresponding one of the second plurality of openings.
    Type: Application
    Filed: March 22, 2011
    Publication date: September 27, 2012
    Applicant: WESTERN DIGITAL TECHNOLOGIES, INC.
    Inventor: THOMAS A. TACKLIND
  • Patent number: 8275318
    Abstract: A magnetic induction data transmission network comprising a master hub, at least one sensor node communicatively coupled to the master hub and a magnetic induction coil preferably adapted to be worn about a body part of a subject such as an individual's waist or neck. In at least one embodiment of the invention, the magnetic induction coil preferably includes a connector which serves as an intermediary between the coil and the hub to allow data communication.
    Type: Grant
    Filed: February 16, 2011
    Date of Patent: September 25, 2012
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Reed W. Hoyt, John F. Lanza
  • Patent number: 8264108
    Abstract: A stator includes an annular core back portion, a plurality of teeth extending radially outward from an outer circumference of the core back portion, and coils. A cylindrical portion of a housing includes a contact portion and a coming-off preventing portion arranged above the contact portion on an outer circumference of the cylindrical portion. The core back portion includes a small-diameter opening defining portion and a large-diameter opening defining portion arranged above the small-diameter opening defining portion. The cylindrical portion is arranged radially inward of the core back portion. The stator is held by the cylindrical portion with a lower surface of the core back portion arranged in contact with the contact portion and an upper surface of the small-diameter opening defining portion arranged in contact with the coming-off preventing portion. A bearing member is arranged radially inside the large-diameter opening defining portion and above the coming-off preventing portion.
    Type: Grant
    Filed: July 1, 2010
    Date of Patent: September 11, 2012
    Assignee: Nidec Corporation
    Inventors: Masashi Nomura, Yukinobu Shiraishi
  • Patent number: 8259408
    Abstract: A spindle motor for use in a 2.5 inch 7 mm high disk drive apparatus includes a base portion; a stator arranged above the base portion; a rotor hub including a cover portion positioned above the stator, and a side wall portion arranged to extend downward from an outer edge of the cover portion; a rotor magnet positioned radially outward of the stator, and fixed to an inner circumferential surface of the side wall portion of the rotor hub; and a bearing mechanism arranged to support the rotor hub and the rotor magnet such that the rotor hub and the rotor magnet are rotatable with respect to the base portion and the stator. A height of the rotor magnet as measured in an axial direction is preferably in a range of about 2 mm to about 3 mm (both inclusive), and a height of a stator core of the stator as measured in the axial direction is preferably in a range of about 50% to about 75% (both inclusive) of the height of the rotor magnet.
    Type: Grant
    Filed: February 24, 2011
    Date of Patent: September 4, 2012
    Assignee: Nidec Corporation
    Inventors: Takehito Tamaoka, Hiroyuki Abe
  • Patent number: 8248725
    Abstract: A spindle motor assembly that utilizes a fluid dynamic bearing electrically grounded to provide a conductive path through the spindle motor assembly. In one embodiment, the fluid dynamic bearing includes a liquid metal that is conductive and of low electrical resistance that provides the conductive path between the spindle and the spindle housing.
    Type: Grant
    Filed: October 9, 2007
    Date of Patent: August 21, 2012
    Assignee: Hitachi Global Storage Technologies, Netherlands B.V.
    Inventors: Ferdinand Hendriks, Albert J. Wallash
  • Patent number: 8243383
    Abstract: A sleeve supports a shaft. A housing member is arranged so as to surround the sleeve and make the end of the sleeve protrude. A base member holds the housing member and fixes a stator core so as to surround the housing member. A hub drives a recording disk by being rotated integrally with the shaft, with a magnet being fixed to an annular portion concentric with the shaft so as to face the stator core fixed to the base member. A thrust member is rotated integrally with the hub, and a descender portion and a ring portion.
    Type: Grant
    Filed: October 8, 2009
    Date of Patent: August 14, 2012
    Assignee: Alphana Technology Co., Ltd.
    Inventors: Takuji Yamada, Yuji Omura, Mitsuo Kodama
  • Patent number: 8243384
    Abstract: Inner circumferential surfaces of a rotor holder and a turntable are in contact with an outer circumferential surface of a shaft. This stabilizes coaxiality of both the rotor holder and the turntable with respect to the shaft. An upper cover portion of the rotor holder includes fixing holes. The turntable includes fixing projections arranged to extend through the fixing holes to be in contact with a lower surface of the upper cover portion. A base end portion of each fixing projection is arranged at a level higher than that of an upper end portion of a corresponding one of the fixing holes. Therefore, even if dimensional errors of the rotor holder and the turntable cause a radial displacement between any fixing projection and a corresponding one of the fixing holes, the rotor holder and the turntable can be fixed to each other while maintaining coaxiality therebetween.
    Type: Grant
    Filed: September 1, 2011
    Date of Patent: August 14, 2012
    Assignee: Nidec Corporation
    Inventors: Mitsuhito Nishio, Takuya Yamane, Hisakazu Motomochi
  • Publication number: 20120200957
    Abstract: In a spindle motor, a lead wire extending from a coil includes a first solder portion coated with a first solder. The lead wire is arranged to extend downward through a base hole portion and a board hole portion. The first solder portion is soldered to a circuit board through a second solder portion. An upper end portion of the first solder portion is arranged above an upper surface of the circuit board such that d1>(d2?d3)/2 is satisfied, where d1 denotes the axial distance between the upper end portion of the first solder portion and the upper surface of the circuit board, d2 denotes an opening width of the board hole portion, and d3 denotes the diameter of the lead wire.
    Type: Application
    Filed: February 3, 2012
    Publication date: August 9, 2012
    Applicant: NIDEC CORPORATION
    Inventor: Atsushi YAWATA
  • Patent number: 8238055
    Abstract: There are provided a motor and a recording disc driving device, which may improve a coupling structure of the motor to enable a magnet provided in a rotor to thereby double as a conventional stopper. The motor may include: a sleeve into which a shaft is rotatably inserted; a sleeve holder including a body part into which the sleeve is inserted, and a flange part protruded from an upper end portion of the body part in an outer diameter direction; a rotor case fastened to an upper end portion of the shaft, and formed such that a cylindrically shaped-rotor main wall is protruded downwardly in an axial direction to receive the flange part; a magnet fastened to a distal end of the rotor main wall so that a part of the magnet is protruded downwardly of the flange part; and a stator fastened to face the magnet, and generating an electromagnetic force.
    Type: Grant
    Filed: December 9, 2010
    Date of Patent: August 7, 2012
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventors: Bum Cho Kim, Sang Jin Park, Jee Ae Noh
  • Patent number: 8228640
    Abstract: A tolerance ring has a band (16) with outwardly extending corrugated protrusions forming waves (2) which engage a surface (8) of the bore (4) in a housing (5). At one end of the tolerance ring is an outwardly flared guide surface (15) extending axially from the band (16). The guide surface (15) acts as an enlarged entrance to the band (16) for a shaft (3) to be mounted in the bore (4) by insertion into the tolerance ring. The use of the guide surface (15) assists assembly and reduces or eliminates particle production. It is also possible for the corrugated portions to extend inwardly, for the guide surface to be inwardly flared, and for the tolerance ring to be mounted on the shaft prior to insertion in the bore.
    Type: Grant
    Filed: August 30, 2010
    Date of Patent: July 24, 2012
    Assignee: Saint-Gobain Performance Plastics Rencol Limited
    Inventors: Niki S. Woodhead, Andrew R. Slayne
  • Publication number: 20120182644
    Abstract: According to one embodiment, a recording head includes a main pole, a trailing core, a first coil wound around the trailing core, a leading core, and a second coil wound around the leading core. The trailing core includes a return pole opposed to a trailing side of the main pole with a write gap therebetween, and side shields arranged individually on opposite sides of the main pole transversely relative to tracks and magnetically separated from the main pole at a distance not more than double a track pitch of the recording medium. The leading core includes a junction opposed to a leading side of the main pole with a gap therebetween and joined to the side shields with a width of 20 ?m or less transversely relative to the tracks and a connecting portion joined to the main pole in a position off the recording medium.
    Type: Application
    Filed: September 2, 2011
    Publication date: July 19, 2012
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Takuya MATSUMOTO, Tomoko Taguchi, Masaya Ohtake
  • Publication number: 20120182645
    Abstract: A rotating machine includes: a coil that is provided on the first surface side of a base and formed with a wire; an insulation sheet that has a sheet hole formed at the position aligned with the position of a guide hole in the base; and a wiring that is provided on the second surface and electrically connected to the coil. The wire forming the coil has a guide wire that is guided on the second surface side through the guide hole and the sheet hole to be connected to the wiring. The insulation sheet has an extending portion that protrudes from the sheet hole and covers at least part of the circumferential surface of the guide hole. The extending portion is placed between part of the circumferential surface of the guide hole and the guide wire.
    Type: Application
    Filed: December 22, 2011
    Publication date: July 19, 2012
    Applicant: ALPHANA TECHNOLOGY CO., LTD.
    Inventors: Yoshio KUROKAWA, Daiki HAYASHI
  • Patent number: 8223455
    Abstract: A rotor hub includes a shaft connecting portion arranged to be connected to a shaft serving as a central axis, a disk loading portion centered about the central axis and arranged to support a disk shaped storage medium mounted thereon, a yoke arranged below the disk loading portion and supporting a field magnet at one of an inner side surface thereof and an outer side surface thereof, and a flexible portion connecting the disk loading portion to the yoke and being flexible with respect to a force applied thereto from the yoke.
    Type: Grant
    Filed: March 9, 2007
    Date of Patent: July 17, 2012
    Assignee: Nidec Corporation
    Inventors: Takuro Iguchi, Yoshihiro Sameshima, Takehito Tamaoka, Ryouji Sugiura
  • Patent number: 8215842
    Abstract: A fluid dynamic pressure bearing includes a shaft arranged along a central axis, an annular member fixed to the shaft, a sleeve, a lubricant, and a lubricating film. A stepped surface is provided on the outer circumferential surface of the shaft. The annular member preferably includes a lower surface extending radially with respect to the central axis and arranged to make contact with the stepped surface in the inner edge portion of the lower surface. The sleeve preferably includes an upper surface axially opposed to the lower surface of the annular member. The lubricant is provided between the shaft and the sleeve and between the annular member and the sleeve. The lubricating film is provided on the lower surface of the annular member at least over a region lying radially outwardly of the inner edge portion of the lower surface.
    Type: Grant
    Filed: January 30, 2009
    Date of Patent: July 10, 2012
    Assignee: Nidec Corporation
    Inventors: Tetsuya Maruyama, Makoto Kutsukake, Hirofumi Kojima, Michihiro Ito, Masayoshi Saichi
  • Publication number: 20120170150
    Abstract: A suspension for a HGA comprises a flexure having a suspension tongue arranged for supporting a slider, which comprising a stainless steel layer and a dielectric layer formed thereon. The dielectric layer has a top surface and bottom surface, a plurality of bonding pads are formed on the top surface at a leading portion of the suspension tongue and arranged for connecting with the slider, and at least two separate supporting pieces are formed on the bottom surface and located at a corresponding position with the bonding pads, thereby releasing stress generated on the bonding pads. The invention also discloses a HGA and a disk drive unit with the same. The invention can release the stress generated on the bonding pads of the suspension, reduce the temperature impact to the suspension, and in turn, reduce thermal crown change of the slider, thereby improving the reading and writing performance.
    Type: Application
    Filed: April 4, 2011
    Publication date: July 5, 2012
    Applicant: SAE Magnetics (H.K.) Ltd.
    Inventors: Xianwen Feng, Kun Yi, Duanxin Li
  • Publication number: 20120170149
    Abstract: Disclosed herein is a spindle motor, including: a rotating part having a rotating shaft and a magnet and a fixing part including a bearing supporting the rotating shaft and an armature corresponding to the magnet, the rotating part rotated by electromagnetic force of the magnet and the armature, wherein the fixing part includes: a plate supporting the rotating shaft; and a flexible circuit board mounted on the top portion of the plate and disposed between the plate and the armature to shield conduction therebetween.
    Type: Application
    Filed: February 23, 2011
    Publication date: July 5, 2012
    Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventors: Young Sun Yoo, Kyung Su Park, Ho Jun Yoo
  • Patent number: 8213113
    Abstract: In a brushless motor, the rotational frequency N (Hz) of the hub satisfies N<F0/(3*P+2), where F0 (Hz) is an Eigen frequency of the second order rocking-mode resonance when not rotating in the situation where the recording disk is mounted on the hub. The recording disk is mounted on the hub. A base plate rotatably supports the hub. A laminated core is fixed to the base. The core has a ring portion and a plurality of teeth that extend radially from the ring portion. Coils are wound around the plurality of teeth. The coils are three-phase driven. A cylindrical magnet is fixed to the hub. The cylindrical magnet are magnetized for driving with P (P is a natural number) poles along the circumferential direction and are arranged to radially face the plurality of teeth.
    Type: Grant
    Filed: October 1, 2009
    Date of Patent: July 3, 2012
    Assignee: Alphana Technology Co. Ltd.
    Inventors: Takanori Watanabe, Hiroshi Iwai, Isamu Hashimoto
  • Patent number: 8212459
    Abstract: A motor is disclosed. The motor can include: a rotor equipped with a shaft; a base, in which a housing hole is formed and which includes a housing support portion protruding along a periphery of the housing hole; a housing, which may be inserted in the housing hole to be supported by the housing support portion and in which a through-hole is formed so that the shaft may be inserted in one side of the through-hole; and a rotor support, which may be inserted into the other side of the through-hole and in which a support indentation is formed to rotatably support the shaft. This motor can be manufactured by a simple process at a low manufacturing cost.
    Type: Grant
    Filed: November 5, 2009
    Date of Patent: July 3, 2012
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventors: Viatcheslav Smirnov, Ho-Jun Yoo, Nam-Seok Kim
  • Patent number: 8213114
    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: Grant
    Filed: August 21, 2009
    Date of Patent: July 3, 2012
    Assignee: Alphana Technology Co., Ltd.
    Inventors: Takanori Watanabe, Hiroshi Iwai, Tomoyuki Tashiro
  • Publication number: 20120162820
    Abstract: The invention relates to a spindle motor, preferably for driving a hard disk drive, having a stationary motor component and a rotatable motor component that is rotatably supported with respect to the stationary motor component and that is driven by an electromagnetic drive system, at least one storage disk being fixed to the rotatable motor component using some means of mounting and fastening. According to the invention, at least parts of the rotatable motor component and at least parts of the means of mounting and fastening have a wear resistant surface coating or are subjected to a wear resistant surface treatment.
    Type: Application
    Filed: December 12, 2011
    Publication date: June 28, 2012
    Inventors: Joerg HOFFMANN, Olaf Winterhalter, Markus Loehr
  • Publication number: 20120162818
    Abstract: A spindle motor includes a shaft arranged to extend in an axial direction, and a base portion arranged to define a portion of a housing, and including a through hole in which the shaft is inserted. A fixing region is defined between an inner circumferential portion of the base portion and a lower portion of the shaft. The fixing region includes a press-fitting region and an adhesion region defined on a lower side of the press-fitting region and in which a seal gap is defined between the inner circumferential portion of the base portion and the lower portion of the shaft. The seal gap is arranged to gradually decrease in radial width with increasing height. The seal gap is arranged to include an adhesive arranged therein over an entire circumference thereof.
    Type: Application
    Filed: December 22, 2011
    Publication date: June 28, 2012
    Applicant: Nidec Corporation
    Inventors: Takatoki SUGI, Tomohiro YONEDA, Hiroshi KOBAYASHI
  • Patent number: 8207643
    Abstract: A motor includes a housing, a rotor and a stator. The housing includes a shaft tube having a free end. The rotor includes a shaft rotatably extending through the bearing and having an annular groove. The stator includes an assembling hole receiving the shaft tube. The stator includes an upper bobbin, a lower bobbin, a plurality of silicon steel plates and a winding. The upper bobbin includes a plurality of pressing plates annularly, each having first and second abutting portions. The first abutting portion has a first end connecting to the upper bobbin, and a second end abutting against a top surface of the bearing. The free end is lower than the first end but higher than the second end. The first abutting portion is spaced from the shaft tube and abuts only on the bearing. The second abutting portion extends from the first abutting portion into the annular groove.
    Type: Grant
    Filed: November 11, 2010
    Date of Patent: June 26, 2012
    Assignee: Sununwealth Electric Machine Industry Co., Ltd.
    Inventors: Alex Horng, Chi Min Wang
  • Patent number: 8198772
    Abstract: A spindle motor can include a rotor support piece, which may rotatably support a rotor that is inserted onto one end, and which may include a projecting part that protrudes from the other end and a mounting part that has a flat surface formed along the periphery of the projecting part; a base plate, in which an insertion hole may be formed for inserting the projecting part through, and on which multiple support protrusions may be formed along the periphery of the insertion hole for supporting the mounting part along a periphery of the insertion hole; and a buffer member, which may include a projecting-part hole for inserting the projecting part through and support-protrusion holes for inserting the support protrusions through, and which may be positioned between the rotor support piece and the base plate to absorb vibration. This arrangement can reduce the occurrence and transfer of vibrations.
    Type: Grant
    Filed: November 3, 2009
    Date of Patent: June 12, 2012
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventor: Viatcheslav Smirnov
  • Patent number: 8194347
    Abstract: A contoured region is disposed within a capillary buffer of a Fluid Dynamic Bearing. In one embodiment, the contoured region comprises at least one defined edge for arresting the displacement of a lubricant within the capillary buffer.
    Type: Grant
    Filed: August 30, 2007
    Date of Patent: June 5, 2012
    Assignee: Hitachi Global Storage Technologies, Netherlands B.V.
    Inventors: Ferdinand Hendriks, Fu-Ying Huang, Chiaoping Ku, Jifang Tian
  • Publication number: 20120134046
    Abstract: According to one embodiment, a magnetic head includes a main pole configured to apply a recording magnetic field, a return pole opposed to a trailing side of the main pole across a write gap and configured to return magnetic flux from the main pole, a coil configured to excite magnetic flux in the main pole, a spin-torque oscillator located between respective facing surfaces of the return pole and an end portion of the main pole on the recording-medium side and configured to produce a high-frequency magnetic field, a current source configured to apply current to the spin-torque oscillator through the return and main poles, and a nonmagnetic layer provided in at least one of the poles and extending from a facing surface of the at least one of the poles, which faces the spin-torque oscillator, in a direction across the facing surface.
    Type: Application
    Filed: August 25, 2011
    Publication date: May 31, 2012
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Takuya MATSUMOTO, Tomoko Taguchi, Masayuki Takagishi