Rotational Drive Detail Patents (Class 360/99.08)
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Patent number: 9082450Abstract: 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: GrantFiled: July 24, 2014Date of Patent: July 14, 2015Assignee: Nidec CorporationInventors: Yuji Kosakamoto, Taisuke Kanemasa, Masaaki Nakagawa
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Patent number: 9065315Abstract: 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: GrantFiled: December 15, 2014Date of Patent: June 23, 2015Assignee: Nidec CorporationInventors: Shunichi Ochitani, Wataru Yamauchi, Masayuki Maeda
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Patent number: 9047911Abstract: 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: GrantFiled: May 21, 2014Date of Patent: June 2, 2015Assignee: SAMSUNG ELECTRO-MECHANICS JAPAN ADVANCED TECHNOLOGY CO., LTD.Inventor: Ryusuke Sugiki
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Publication number: 20150146322Abstract: 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: ApplicationFiled: August 31, 2012Publication date: May 28, 2015Applicant: AGENCY FOR SCIENCE, TECHNOLOGY AND RESEARCHInventors: 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
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Publication number: 20150146323Abstract: 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: ApplicationFiled: January 30, 2015Publication date: May 28, 2015Inventors: Kenichiro YAMADA, Katsuhiko KOUI
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Publication number: 20150146324Abstract: 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: ApplicationFiled: January 30, 2015Publication date: May 28, 2015Inventors: Kenichiro YAMADA, Katsuhiko KOUI
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Publication number: 20150138670Abstract: 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: ApplicationFiled: January 28, 2015Publication date: May 21, 2015Inventors: Kazuhiro SATO, Masahiro SHIRAISHI, Takayuki ISHINO, Akihiro YUDATE, Takuro MATSUMOTO, Toshihiro AKIYAMA
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Publication number: 20150138669Abstract: 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: ApplicationFiled: February 26, 2014Publication date: May 21, 2015Applicant: KABUSHIKI KAISHA TOSHIBAInventor: Masaya KUDO
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Patent number: 9035516Abstract: 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: GrantFiled: March 5, 2013Date of Patent: May 19, 2015Assignee: SAMSUNG ELECTRO-MECHANICS CO., LTD.Inventors: Myeung Hwa Heo, Won Ki Park, Satoru Sodeoka
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Patent number: 9030775Abstract: 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: GrantFiled: May 10, 2011Date of Patent: May 12, 2015Assignee: Samsung Electro-Mechanics Japan Advanced Technology Co., Ltd.Inventors: Takanori Watanabe, Takuji Yamada, Susumu Ando, Hiroshi Iwai
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Publication number: 20150124352Abstract: 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: ApplicationFiled: November 4, 2013Publication date: May 7, 2015Applicant: HGST Netherlands B.V.Inventors: Edgar Dennis Rothenberg, Yiduo Zhang
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Patent number: 9025284Abstract: 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: GrantFiled: May 16, 2014Date of Patent: May 5, 2015Assignee: Western Digital Technologies, Inc.Inventors: Kevin R. Sill, Aaron D. Little
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Publication number: 20150116865Abstract: 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: ApplicationFiled: October 20, 2014Publication date: April 30, 2015Inventor: Masafumi MIZUNO
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Patent number: 9019656Abstract: 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: GrantFiled: March 4, 2014Date of Patent: April 28, 2015Assignee: Samsung Electro-Mechanics Japan Advanced Technology Co., Ltd.Inventors: Mitsuo Kodama, Ryusuke Sugiki
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Publication number: 20150109702Abstract: 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: ApplicationFiled: March 31, 2014Publication date: April 23, 2015Applicant: Western Digital (Fremont), LLCInventors: 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
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Patent number: 9013829Abstract: 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: GrantFiled: May 1, 2014Date of Patent: April 21, 2015Assignee: Nidec CorporationInventor: Akinobu Sumiji
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Patent number: 9007716Abstract: 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: GrantFiled: July 31, 2014Date of Patent: April 14, 2015Assignee: Western Digital Technologies, Inc.Inventor: Mitchell D. Dougherty
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Patent number: 9001461Abstract: 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: GrantFiled: August 13, 2014Date of Patent: April 7, 2015Assignee: Nidec CorporationInventor: Atsushi Yawata
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Patent number: 9001460Abstract: 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: GrantFiled: July 14, 2014Date of Patent: April 7, 2015Assignee: Nidec CorporationInventors: Hironori Ando, Mitsuhiro Takemoto
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Patent number: 9001459Abstract: 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: GrantFiled: August 15, 2012Date of Patent: April 7, 2015Assignee: Nidec CorporationInventors: Hiroyuki Abe, Takehito Tamaoka, Kazuhiro Sato
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Publication number: 20150092299Abstract: There are provided a spindle motor including a lower thrust member fixed to a base member; and a shaft fixed to the lower thrust member, wherein the lower thrust member includes a fitting protrusion protruding upwardly in the axial direction and fitted into a fixing groove formed in a lower end of the shaft so as to be depressed upwardly in the axial direction, a thrust bearing surface forming a thrust bearing between the thrust bearing surface and a lower surface of the sleeve, and an extension part protruding from an outer edge of the lower thrust member in a radial direction upwardly in the axial direction to form a liquid-vapor interface between the extension part and an outer surface of the sleeve while enclosing the sleeve, and the thrust bearing surface has inner and outer concave parts depressed in one of inner and outer diameter directions thereof, respectively.Type: ApplicationFiled: January 30, 2014Publication date: April 2, 2015Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.Inventors: Song Bon Oh, Shin Young Cheong, Kum Kyung Lee
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Patent number: 8995083Abstract: There are provided a spindle motor and a hard disk drive including the same. The spindle motor includes: a sleeve supporting a shaft so that an upper end of the shaft protrudes upwardly in an axial direction and a bearing clearance filled with a lubricating fluid formed between the sleeve and the shaft; a housing provided so as to enclose an outer peripheral surface of the sleeve and forming a circulation hole between the housing and the sleeve in the axial direction; and a rotor hub fixedly installed on an upper end portion of the shaft in the axial direction, wherein a connection part is formed between the housing and the rotor hub so as to allow a sealing part on which a liquid-vapor interface is disposed and the circulation hole to be in communication with each other.Type: GrantFiled: August 22, 2013Date of Patent: March 31, 2015Assignee: Samsung Electro-Mechanics Co., Ltd.Inventor: Duck Young Kim
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Patent number: 8995084Abstract: The disk drive device includes a base member with a first upper surface and a second lower surface, a hub, a bearing unit arranged on the base member that rotatably supports the hub, a spindle drive unit that drives the hub to rotate, and a wiring member arranged on the second surface of the base member. The spindle drive unit includes a stator core having a salient pole with coil wound around, and a magnet opposed thereto. The base member includes a wire hole through which a wire is placed, with a first opening on the first surface and a second opening on the second surface. A concaved area on the second surface includes a lower slope, axially between the concaved area and the second opening on which a wiring member is arranged. The wire is connected to the wiring member, radially outside of an outer diameter of the magnet.Type: GrantFiled: August 26, 2014Date of Patent: March 31, 2015Assignee: Samsung Electro-Mechanics Japan Advanced Technology Co., Ltd.Inventors: Tomoyuki Tashiro, Takanori Watanabe, Hiroshi Iwai
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Publication number: 20150085397Abstract: 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: ApplicationFiled: August 13, 2014Publication date: March 26, 2015Inventor: Atsushi YAWATA
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Publication number: 20150085398Abstract: 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: ApplicationFiled: August 13, 2014Publication date: March 26, 2015Inventors: Atsushi YAWATA, Hirotoshi UCHIBORI, Toshihiro AKIYAMA
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Patent number: 8988820Abstract: A rotating device includes a hub on which a magnetic recording disk is to be mounted, a base supporting the hub in a freely rotatable manner through a fluid dynamic bearing, a stator core which is fixed to the base, and which includes an annular portion and multiple salient poles extending therefrom, coils wound around the respective salient poles, and a flexible printed board transmitting electrical power to the coils. A drawn wire of the coil is electrically connected with the flexible printed board at a connection position avoiding a location right below the coil where the drawn wire is drawn.Type: GrantFiled: November 18, 2014Date of Patent: March 24, 2015Assignee: Samsung Electro-Mechanics Japan Advanced Technology Co., Ltd.Inventor: Tomoyuki Tashiro
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Publication number: 20150077877Abstract: An enlarged substrate for a magnetic recording medium used in a data storage device such as a hard disc drive (HDD). In some embodiments, an apparatus includes a substrate for a magnetic recording disc for installation in a 3½ inch form factor hard disc drive, the substrate having an overall diameter of nominally from 96.9 mm to 100.4 mm. In other embodiments, an apparatus comprises a substrate for a magnetic recording disc for installation in a 2½ inch form factor hard disc drive, the substrate having an overall diameter of nominally from 66.9 mm to 71.8 mm. In other embodiments, a data storage device has a magnetic recording medium that uses an enlarged substrate as set forth above.Type: ApplicationFiled: November 24, 2014Publication date: March 19, 2015Inventors: Koji Adachi, Ian J. Beresford, Thomas Y. Chang, Kuo Hsing Hwang, Jim P. Hennessy, David Perez
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Patent number: 8975797Abstract: A disk-rotating motor includes a rotor section including a rotor magnet attached to a rotor frame and a shaft fixed to a center of the rotor frame, and a stator section including a shaft-bearing which bears the shaft, wherein the stator section includes the shaft-bearing, a shaft-bearing housing which holds the shaft-bearing, a thrust plate which bears the shaft in an axis direction, a stator core which is arranged to face the rotor magnet and provided with wire-winding, a core holder which holds the stator core, and a bracket which holds the shaft-bearing housing. The bracket has a projecting part which fixes the shaft-bearing at a central part thereof, an inner diameter part of the shaft-bearing is press-fitted to be tightened to the projecting part, and an outer diameter part of the shaft-bearing housing is adhered to be tightened to an inner diameter part of the core holder.Type: GrantFiled: March 4, 2010Date of Patent: March 10, 2015Assignee: Minebea Co., Ltd.Inventors: Toshiyuki Nishikata, Kumio Masuda
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Patent number: 8976486Abstract: A rotating device is provided with: a hub that is rotatably supported by the base and on which a recording disk is to be mounted; a yoke that is fixedly provided on the hub and is configured to hold a magnet; a bearing unit in which one end thereof is fixedly provided on the base and in which the other end thereof is configured to hold the hub; and a coil that is fixedly provided on the base and is configured to generate electromagnetic interaction with the magnet. The hub has a screw hole in which a screw for fixing a clamper, which is used to fix the recording disk to the hub, to the hub is screwed. The screw hole penetrates the hub. The yoke is configured such that the yoke covers one end of the screw hole.Type: GrantFiled: October 14, 2013Date of Patent: March 10, 2015Assignee: Samsung Electro-Mechanics Japan Advanced Technology Co., Ltd.Inventors: Hirotake Nishino, Akira Suzuki, Kazuyoshi Nagai
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Patent number: 8976487Abstract: A rotating device comprises: a hub on which a magnetic recording disk is to be mounted; a base configured to rotatably support the hub via a bearing; a shaft configured such that it extends along the rotational axis of the hub; and a chassis arranged such that it faces the magnetic recording disk, and configured to have a Young's modulus that is smaller than that of the base. A base hole is provided to the upper face of the chassis that faces the magnetic recording disk such that it extends along the rotational axis. Furthermore, the base is fitted into the base hole, thereby fixedly mounting the base on the chassis.Type: GrantFiled: November 7, 2013Date of Patent: March 10, 2015Assignee: Samsung Electro-Mechanics Japan Advanced Technology Co., Ltd.Inventors: Mitsuo Kodama, Taketo Nonaka, Masafumi Mizuno
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Publication number: 20150062750Abstract: A rotating device includes a stationary body, a rotating body formed with an opening encircling a rotation axis, a fluid dynamic bearing mechanism which supports the rotating body relative to the stationary body, and which has a portion at one end side fitted in and fixed to the opening, a support portion that protrudes from an outer circumference of the fluid dynamic bearing mechanism to support the rotating body, and an abutting portion provided at the rotating body so as to abut the support portion. The support portion includes a flange protruding outwardly in a radial direction from the outer circumference of the fluid dynamic bearing mechanism, and the abutting portion includes a step that is a recess which is formed along an open end of the opening and into which at least a part of the flange enters.Type: ApplicationFiled: August 27, 2014Publication date: March 5, 2015Applicant: SAMSUNG ELECTRO-MECHANICS JAPAN ADVANCED TECHNOLOGY CO. LTDInventors: Akikazu IZUMI, Hiroshi MORIMOTO
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Patent number: 8970984Abstract: A spindle includes a fixed member, a hub rotatably attached to the fixed member, and a bearing between the rotatable hub and the fixed member. The bearing including a bearing lubricant. A seal reduces migration of the bearing lubricant away from the bearing. The seal includes an immobile cylindrical surface of the fixed member, and a rotatable cylindrical surface of the hub. One of these surfaces includes a plurality of grooves. The immobile cylindrical surface and the rotatable cylindrical surface are concentric about the hub rotation axis. The rotatable cylindrical surface faces and is separated from the immobile cylindrical surface by a gas-filled radial clearance of not less than 50 microns.Type: GrantFiled: April 29, 2014Date of Patent: March 3, 2015Assignee: Western Digital Technologies, Inc.Inventor: Klaus Kloeppel
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Publication number: 20150055247Abstract: 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: ApplicationFiled: July 14, 2014Publication date: February 26, 2015Inventors: Hironori ANDO, Mitsuhiro TAKEMOTO
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Publication number: 20150055246Abstract: 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: ApplicationFiled: May 1, 2014Publication date: February 26, 2015Applicant: NIDEC CORPORATIONInventor: Akinobu SUMIJI
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Publication number: 20150055248Abstract: A spindle motor includes a recording disk and a clamper. A cylindrical portion includes a first screw portion positioned in an outer circumferential portion of the cylindrical portion. The clamper includes an annular raised portion configured to be fitted in a through hole of the recording disk. An inner circumferential portion of the clamper includes a second screw portion configured to be screwed to the first screw portion. At least a portion of the second screw portion is positioned in an inner circumferential portion of the annular raised portion. Each of the first screw portion and the second screw portion includes at least one of a screw groove and a screw thread. An axial position of at least a portion of the second screw portion overlaps with an axial position of the recording disk.Type: ApplicationFiled: August 13, 2014Publication date: February 26, 2015Inventors: Katsuya TAKAHASHI, Yuki TAJIMA, Kazuhiro SATO, Yuya SAITO, Hironori ANDO, Masahiro SHIRAISHI
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Patent number: 8964329Abstract: A lead wire guide member is made of an electrically insulating material, and arranged to extend along a lower surface of a base portion. A movement restricting portion is arranged in the lower surface of the base portion. Lead wires are arranged to pass through base through holes to reach the lower surface, and extend along the lower surface to be connected to the circuit board. A spindle motor further includes a sealant arranged between an entire circumferential extent of each base through hole and an entire circumferential extent of the corresponding lead wire. The lead wire guide member includes an inner edge and an outer edge. The inner edge is arranged opposite to the lead wires. The outer edge is arranged to at least face radially outward. The movement restricting portion is in contact with the outer edge of the lead wire guide member.Type: GrantFiled: April 30, 2014Date of Patent: February 24, 2015Assignee: Nidec CorporationInventors: Masanobu Taki, Hiroshi Kobayashi, Tomohiro Yoneda, Makoto Yamashita
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Patent number: 8964330Abstract: A disk drive device includes a chassis, a top cover fixed to a chassis, a rotating body on which a disk retained in a disk retaining space formed between the chassis and the top cover is to be mounted, and a bearing body that supports the rotating body in a freely rotatable manner relative to the chassis. The bearing body has a lubricant applied in a predetermined area, and a capturer that captures the vaporized lubricant from the gas-liquid interface is provided in a space in communication with the disk retaining space from the gas-liquid interface of the lubricant.Type: GrantFiled: July 16, 2014Date of Patent: February 24, 2015Assignee: Samsung Electro-Mechanics Japan Advanced Technology Co., Ltd.Inventor: Kazuhiro Matsuo
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Patent number: 8953280Abstract: There is provided a spindle motor including: a shaft including a body portion having a fixing recess formed on a lower portion thereof, a flange portion extending in an outer radial direction from an upper portion of the body portion, and a first insertion portion extending downwardly from the flange portion in an axial direction; a lower thrust member including a fixed portion inserted into the fixing recess, a disk portion extending from the fixed portion in an outer radial direction, and first and second protrusion portions extending from the disk portion in the axial direction; a base member coupled to the second protrusion portion; and a rotating member forming a bearing clearance with the shaft and provided to be rotatable with respect to the shaft.Type: GrantFiled: March 13, 2013Date of Patent: February 10, 2015Assignee: Samsung Electro-Mechanics Co., Ltd.Inventor: Viatcheslav Smirnov
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Publication number: 20150036240Abstract: Systems and methods are illustrated for manufacturing hard disks with double lubrication layers that allow minimization of a HDD head DFH touchdown point while maintaining good tribology performance for HDD reliability. An exemplary hard disk includes a magnetic recording layer, a carbon overcoat, and a double lubrication layer: a bonded lubrication layer and a mobile lubrication layer. The bonded lubrication layer includes a high conformity and high density first lubricant. The mobile layer include a high lubricity lubricant that promotes HDI reliability.Type: ApplicationFiled: March 4, 2014Publication date: February 5, 2015Applicant: WD Media, LLCInventors: YASUO SAKANE, KIM THUY THI LAI, SHAUN H. CHEN, BING-SHIUAN CHANG
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Patent number: 8946953Abstract: There is provided a base assembly for a motor, the base assembly including: a base supporting rotation of a rotating member of the motor; and a pulling plate provided to the base to thereby prevent excessive floating of the rotating member, wherein the pulling plate includes a body part not in contact with the base and an extension part extended from the body part to thereby contact the base.Type: GrantFiled: January 24, 2012Date of Patent: February 3, 2015Assignee: Samsung Electro-Mechanics Co., Ltd.Inventors: Dong Jin Kim, Young Ha Park
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Publication number: 20150029614Abstract: A disk drive device includes a chassis, a top cover fixed to a chassis, a rotating body on which a disk retained in a disk retaining space formed between the chassis and the top cover is to be mounted, and a bearing body that supports the rotating body in a freely rotatable manner relative to the chassis. The bearing body has a lubricant applied in a predetermined area, and a capturer that captures the vaporized lubricant from the gas-liquid interface is provided in a space in communication with the disk retaining space from the gas-liquid interface of the lubricant.Type: ApplicationFiled: July 16, 2014Publication date: January 29, 2015Applicant: SAMSUNG ELECTRO-MECHANICS JAPAN ADVANCED TECH. CO. LTD.Inventor: Kazuhiro MATSUO
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Patent number: 8941947Abstract: A thin spindle motor having a stator core with sufficient swaging strength even using thin magnetic steel sheets is provided, whereby the magnetic loss and the power consumption of the spindle motor are reduced. The stator core is formed by laminating plural stator laminations with a thickness of 0.1 to 0.2 mm and joined by a swaging portion. The swaging portion has an approximately rectangular shape having long sides extending along a radial direction when viewed from an axial direction. The swaging portion has a cross section with a middle portion parallel to the radial direction and a slope portion at the both sides when viewed from a circumferential direction, thereby forming a recess. The recess has a depth that is less than the thickness of the stator lamination whereby the swaging portion does not cut the stator lamination.Type: GrantFiled: October 11, 2013Date of Patent: January 27, 2015Assignee: Minebea Co., Ltd.Inventors: Hideaki Showa, Ryoichi Kurosawa, Hironobu Tsuge
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Patent number: 8941946Abstract: A motor includes a stationary portion and a rotating portion that is rotatable about a central axis extending in a vertical direction with respect to the stationary portion. The stationary portion includes a shaft and a cup portion. The shaft extends in an axial direction and is fixed to the cup portion. The rotating portion includes a sleeve portion including at least a portion thereof arranged inside the cup portion, and is arranged opposite to the shaft. The cup portion includes a cylindrical portion, a bottom plate portion, and a first conical portion. The cylindrical portion is radially opposite to an outer circumferential surface of the sleeve portion. The bottom plate portion is inside the cylindrical portion. The first conical portion extends upward from an inner end portion of the bottom plate portion.Type: GrantFiled: May 3, 2013Date of Patent: January 27, 2015Assignee: Nidec CorporationInventor: Yoichi Sekii
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Publication number: 20150022919Abstract: In a method of manufacturing a spindle motor, a sheet preferably made of a thermoplastic resin is closely adhered to an upper surface of a base portion of a spindle motor such that the sheet covers a base hole of the base portion. Next, heat is applied to a region of the sheet which coincides with the base hole to define a sheet hole continuous with the base hole. Thereafter, a coil is arranged over the base portion, and a conducting wire defining the coil is extended through the sheet hole and the base hole to be drawn downwardly out of the base portion. The sheet hole is thus defined after the sheet is closely adhered to the base portion. In addition, the sheet hole is defined by melting the resin through application of the heat. It is therefore easy to arrange the sheet and define the sheet hole.Type: ApplicationFiled: October 7, 2014Publication date: January 22, 2015Inventors: Masakazu MATSUYAMA, Ryosuke ONOE, Kazuhiro FUJITANI, Xiang ZHANG
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Publication number: 20150015993Abstract: There is provided a base assembly including: a base member formed by performing plastic deformation on a steel sheet to be at least partially bent; and a flexible printed circuit board disposed on a bottom surface of the base member, wherein a surface having the flexible printed circuit board disposed thereon on the bottom surface of the base member is flat.Type: ApplicationFiled: January 23, 2014Publication date: January 15, 2015Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.Inventors: Hyun Chul Lee, Shin Young Cheong
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Publication number: 20150015992Abstract: According to one embodiment, a magnetic recording head includes a main pole, a write shield facing the main pole with a write gap interposed therebetween, a recording coil, and a high-frequency oscillator including an oscillation layer provided within the write gap between an end portion of the main pole and the write shield, and an intermediate layer and a spin-injection layer stacked on the oscillation layer. The oscillation layer, the intermediate layer and the spin-injection layer are stacked in a direction intersecting the gap length direction of the write gap, and at least one of the oscillation layer and the spin-injection layer is electrically connected to one of the main pole and the write shield.Type: ApplicationFiled: September 10, 2013Publication date: January 15, 2015Applicant: Kabushiki Kaisha ToshibaInventor: Tomomi FUNAYAMA
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Patent number: 8934195Abstract: Thus, if a shock or other disturbance to a disc stack spindle bearing assembly occurs that tilts the bearing assembly, the resulting motion is both a tilting, and a motion which is axial. If a shock axially moves the hub assembly, only an axial motion occurs. Thus the system has a non-linear behavior. Pursuant to this invention, when a tilting disturbance occurs, and some of it is dissipated in a net axial movement at a different frequency, energy is subtracted out of the system with motion that is not linearly related to the disturbance that created it.Type: GrantFiled: September 14, 2012Date of Patent: January 13, 2015Assignee: Seagate Technology LLCInventors: Hans Leuthold, Susan Immisch, Saul Ceballos, Michael Tiller
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Patent number: 8934196Abstract: A rotating apparatus includes a hub, a shaft housing portion having a center through-hole, and a base plate, having a base circular part that extends axially and with an inner surface thereof used as a bearing hole. Further included is a shaft with a cylindrical section housed in the through-hole, an extending section formed integrally with the cylindrical section and extending radially from a first end of the cylindrical section, and an annular section provided radially from a second end of the cylindrical section. Provided on the inner surface of the through-hole is a groove configured to generate radial dynamic pressure in lubricant. The rotatable rotor includes a portion encircling at least part of the annular section. An opening of the bearing hole surrounds a part of the shaft housing portion, the extending section inserted and fixed into the opening, with a hardening resin interposed therebetween.Type: GrantFiled: November 13, 2013Date of Patent: January 13, 2015Assignee: Samsung Electro-Mechanics Japan Advanced Technology Co., Ltd.Inventors: Mitsuo Kodama, Ryusuke Sugiki, Akira Aoi
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Patent number: 8931175Abstract: It is an object of the present invention to provide a bearing member having a highly accurate dynamic pressure generating portion stably at low cost. Dynamic pressure grooves (8a1) and (8a2) are formed as the dynamic pressure generating portions on an inner circumferential surface of the electroforming portion (10) by an electroforming process, and injection molding is performed by using a resin while inserting the electroforming portion (10), thereby forming a bearing member (8). A shaft member (2) is inserted into an inner circumference of the bearing member.Type: GrantFiled: March 30, 2012Date of Patent: January 13, 2015Assignee: NTN CorporationInventors: Natsuhiko Mori, Nobuyoshi Yamashita, Fuminori Satoji, Isao Komori, Toshiyuki Mizutani, Masafumi Okuma, Kenichi Mitani
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Patent number: 8928196Abstract: There is provided a spindle motor including: a sleeve rotatably supporting a shaft; a rotor coupled to an upper end of the shaft and rotating in conjunction with the shaft; a stopper portion coupled to a main wall portion protruded from one surface of the rotor and facing an outer circumferential surface of the sleeve; a stator holder having a fixed portion coupled to an outer circumferential surface of the sleeve, an installation portion to which a core having a coil wound therearound is fixed, and a connection portion connecting an upper end of the fixed portion and an upper end of the installation portion; and a base member fixedly coupled to the stator holder.Type: GrantFiled: March 12, 2013Date of Patent: January 6, 2015Assignee: Samsung Electro-Mechanics Co., Ltd.Inventor: Viatcheslav Smirnov