Rotational Drive Detail Patents (Class 360/99.08)
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Publication number: 20140002925Abstract: 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, and a high-frequency oscillator disposed adjacent to the main pole and near a air-bearing surface which faces the recording medium. The high-frequency oscillator includes a lower end surface located nearest to the air-bearing surface and an upper end surface located farthest from the air-bearing surface. A length of the lower end surface in a cross track direction is longer than a length of the upper end surface in the cross track direction.Type: ApplicationFiled: December 12, 2012Publication date: January 2, 2014Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Yusuke TOMODA, Kenichiro YAMADA, Naoyuki NARITA
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Patent number: 8619388Abstract: A fluid dynamic bearing with an immiscible fluid barrier deposited on the bearing oil is disclosed. One embodiment provides the fluid dynamic bearing having a seal gap to define a seal cavity. The seal cavity is filled with the bearing oil for lubricating the fluid dynamic bearing. The immiscible fluid is disposed on the bearing oil to prevent the bearing oil from evaporating from the seal cavity. In one embodiment, the immiscible fluid is insoluble in the bearing oil.Type: GrantFiled: April 22, 2008Date of Patent: December 31, 2013Assignee: HGST Netherlands B.V.Inventors: Thomas E. Karis, Neal B. Schirle, Kunihiro Shida
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Publication number: 20130342934Abstract: A spindle motor arranged to rotate a disk about a center axis extending in an up-down direction includes a rotary unit including a rotor magnet and a stationary unit including a stator opposed to the rotor magnet and a base plate. The base plate includes a flat plate-shaped member positioned around the center axis and made of a first kind of metallic material and a base body axially overlapping with the plate-shaped member and made of a second kind of metallic material. The first kind of metallic material is larger in Young's modulus than the second kind of metallic material. The base body includes a cylindrical or substantially cylindrical bearing attachment portion axially extending about the center axis and a bottom plate portion radially extending from a lower portion of the bearing attachment portion. The plate-shaped member is positioned below the bottom plate portion to contact the bottom plate portion.Type: ApplicationFiled: March 4, 2013Publication date: December 26, 2013Applicant: NIDEC CORPORATIONInventors: Masahiro SHIRAISHI, Kazuhiro SATO, Katsuya TAKAHASHI
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Publication number: 20130342935Abstract: 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: ApplicationFiled: August 27, 2013Publication date: December 26, 2013Applicant: Samsung Electro-Mechanics Japan Advanced Technology Co., Ltd.Inventors: Takanori WATANABE, Hiroshi IWAI, Tomoyuki TASHIRO
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Publication number: 20130335860Abstract: A base plate of a disk drive apparatus includes a motor base disposed around a central axis and a base body portion extending radially outward of the motor base. The motor base is made of a metallic material of a first type. The base body portion is made of a metallic material of a second type. The base body portion is a casting product in which the motor base is an insert component. An upper protruding portion and a lower protruding portion are defined in one of an outer end portion of a bottom plate portion of the motor base and an inner end portion of the base body portion.Type: ApplicationFiled: March 8, 2013Publication date: December 19, 2013Applicant: Nidec CorporationInventors: Yuki MASUMI, Junzo FUJINAWA
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Publication number: 20130335859Abstract: A base plate of a disk drive apparatus includes a motor base disposed around a central axis and a base body portion extending radially outward of the motor base. The motor base is made of a metallic material of a first type. The base body portion is made of a metallic material of a second type. Thus, the axial thickness of a portion of the base plate close to the central axis can be significantly reduced and a reduction in the stiffness of the portion can be prevented. Further, the motor base includes a flange portion and a plastic deforming portion. The flange portion and the plastic deforming portion are respectively in contact with at least a portion of both axial end surfaces of an inner end portion of the base body portion. Thus, extraction of the motor base in the axial direction is prevented.Type: ApplicationFiled: March 7, 2013Publication date: December 19, 2013Applicant: NIDEC CORPORATIONInventors: Akio TATSUMI, Takashi FUJIWARA, Takayuki ISHINO, Kiyofumi INOUE, Akihiro YUDATE
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Patent number: 8605385Abstract: A spindle motor and a hard disc drive including the same are provided. The spindle motor including: a rotary member; and a fixed member rotatably supporting the rotary member by fluid dynamic pressure, wherein upper radial dynamic pressure generating grooves and lower radial dynamic pressure generating grooves are formed in at least one of surfaces of the rotary member and the fixed member facing each other in a radial direction, and thrust dynamic pressure generating grooves are formed in at least one of surfaces of the rotary member and the fixed member facing each other in an axial direction. In the thin spindle motor, a burden of slope rigidity may be transferred from the radial bearing to the thrust bearing so that the rotary member can have slope rigidity enough to be returned to its original position, when the rotary member is sloped to one side.Type: GrantFiled: February 20, 2013Date of Patent: December 10, 2013Assignee: Samsung Electro-Mechanics Co., Ltd.Inventors: Jung Hwan Song, Shin Young Cheong
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Publication number: 20130321951Abstract: A bearing mechanism includes a shaft portion, a sleeve portion, a lower opposing portion, a lower outer annular portion, and an upper opposing portion. The sleeve portion includes a sleeve body and a lower thrust plate. A radial dynamic pressure bearing portion is defined in a radial gap. A lower thrust dynamic pressure bearing portion is defined in a lower thrust gap. A lower seal portion is defined in a lower seal gap located between the sleeve portion and the lower outer annular portion. An upper seal portion is defined in an upper seal gap continuous with an upper thrust gap. The sleeve portion includes a first communicating channel in communication with the upper seal gap, and a second communicating channel located between the sleeve body and the lower thrust plate. A lower mouth portion of the first communicating channel axially overlaps the lower thrust dynamic pressure bearing portion.Type: ApplicationFiled: February 25, 2013Publication date: December 5, 2013Applicant: NIDEC CORPORATIONInventors: Akinobu SUMIJI, Akihiro KIMURA, Kunio SAKURADA
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Publication number: 20130321952Abstract: A bearing mechanism includes a shaft portion, a sleeve portion, a lower opposing portion, a lower outer ring-shaped portion, and an upper opposing portion. A lower seal portion serving as a pumping seal portion is provided in a lower seal gap between the sleeve portion and the lower outer ring-shaped portion. An upper seal portion is provided in an upper seal gap joined to an upper thrust gap. The lower portion of the sleeve portion includes a large-diameter portion and a small-diameter portion positioned below the large-diameter portion. The sleeve portion includes a communication path joined to the upper seal gap. The communication path includes an opening portion opened in a border between the large-diameter portion and the small-diameter portion. The outer peripheral portion of the lower opposing portion includes an outer periphery protrusion portion radially opposed to the small-diameter portion and axially opposed to the large-diameter portion.Type: ApplicationFiled: March 5, 2013Publication date: December 5, 2013Applicant: NIDEC CORPORATIONInventors: Akinobu SUMIJI, Akihiro KIMURA, Kunio SAKURADA
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Publication number: 20130321950Abstract: The present invention generally relates to a head comb for use in a hard disk drive. In one embodiment, the head comb comprises a core body having a bore formed therethrough. The bore is bound by walls having a top extension extending into the opening and a bottom extension extending into the opening. The top extension has a first height, and the bottom extension has a second height that is different than the first height.Type: ApplicationFiled: May 31, 2012Publication date: December 5, 2013Inventors: Ta-Chang Fu, Zhong-Qing Gong, Robert C. Reinhart
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Patent number: 8599517Abstract: A spindle motor of a disk drive apparatus includes a base unit, a stator, a covered cylindrical rotor hub, a rotor magnet, and a bearing mechanism. The rotor magnet is an Nd—Fe—B bond magnet. The thickness of the rotor magnet in the radial direction is about 0.7 mm or more and about 1.0 mm or less. The distance between the rotor magnet and the stator core in the radial direction is about 0.15 mm or more and about 0.20 mm or less. A torque constant Kt of torque generated between the stator and the rotor magnet is about 4 mN·m/A or more and about 6 mN·m/A or less. A motor constant Km is about 2 mN·m/(A·??) or more and about 4 mN·m/(A·??) or less.Type: GrantFiled: March 13, 2013Date of Patent: December 3, 2013Assignee: Nidec CorporationInventor: Hiroyuki Abe
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Patent number: 8599516Abstract: A disk drive device includes: a hub on which a recording disk is to be mounted; a base member; a bearing unit configured to support the hub in a manner in which the hub can be relatively rotated with respect to the base member; an extended annular groove portion provided in part of the hub around the rotational axis of the hub; and a weight member that is installed in the extended annular groove portion to adjust a rotational balance when the recording disk is being rotated with the hub. The weight member has a fixing mechanism that is slidable, when installed, in the direction of the extended annular groove portion and that can substantially maintain a stopped state at a fixing position.Type: GrantFiled: September 23, 2010Date of Patent: December 3, 2013Assignee: Samsung Electro-Mechanics Japan Advanced Technology Co., Ltd.Inventor: Yuji Nishitani
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Publication number: 20130314818Abstract: A recording head includes a main magnetic pole generating a recording magnetic field in a direction perpendicular to a recording medium, a write shield magnetic pole facing a trailing side of the main magnetic pole, a recording coil exciting a magnetic flux in a magnetic circuit, and a spin torque oscillator provided between the main magnetic pole and the write shield magnetic pole. The main magnetic pole includes a trailing side end surface that faces the spin torque oscillator and is tilted toward a leading side of the recording head with respect to the direction perpendicular to the recording medium, and the spin torque oscillator has layers with tilted surfaces that are substantially in parallel with the trailing side end surface.Type: ApplicationFiled: October 24, 2012Publication date: November 28, 2013Inventors: Takuya Maatsumoto, Kenichiro Yamada, Noayuki Narita
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Patent number: 8593758Abstract: A spindle motor includes a stationary portion and a rotating portion including a seal defining portion. The stationary portion includes a shaft portion, an annular member fixed to an upper portion of the shaft portion in, for example, a tight-fitting condition, and a cap member. A radially inner end portion of the cap member is fixed to each of the shaft portion and the annular member preferably through, for example, an adhesive. An upper seal portion, in which a surface of a lubricating oil is arranged, is defined in an upper seal gap defined between an outer circumferential surface of the annular member and an inner circumferential surface of the seal defining portion. The cap member is arranged to cover an upper side of the upper seal portion.Type: GrantFiled: January 19, 2012Date of Patent: November 26, 2013Assignee: Nidec CorporationInventors: Takashi Yamamoto, Tsuchitsugu Watanabe
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Patent number: 8593759Abstract: A spindle motor includes a base member, an armature positioned above the base member, and a circuit substrate electrically connected to coils of the armature. The base member includes an annular bottom portion positioned below the armature and a lower slant surface extending radially outward and upward from an outer peripheral portion of a lower surface of the bottom portion. The circuit substrate includes a first substrate piece and a second substrate piece arranged in a circumferentially spaced-apart relationship with the first substrate piece. Each of the first substrate piece and the second substrate piece includes at least one land portion arranged on a lower surface thereof.Type: GrantFiled: March 11, 2013Date of Patent: November 26, 2013Assignee: Nidec CorporationInventors: Takuro Matsumoto, Atsushi Yawata, Toshihiro Akiyama
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Patent number: 8593757Abstract: A spindle motor includes a stationary portion, a bearing mechanism, and a rotating portion. The bearing mechanism is attached to the stationary portion. The stationary portion includes a base portion, a stator, and a wiring. The base portion is arranged to define a portion of a housing of the disk drive apparatus, the housing defining an airtight interior space. The base portion includes a recessed portion defined on a side thereof where the interior space is defined. The recessed portion includes an inner side surface including an adhesion region and a press-fit region. A lower portion of the bearing mechanism is fixed to the adhesion region through an adhesive, and press fitted to the press-fit region. An axial dimension of the adhesion region is arranged to be greater than that of the press-fit region.Type: GrantFiled: September 23, 2011Date of Patent: November 26, 2013Assignee: Nidec CorporationInventors: Takatoki Sugi, Tomohiro Yoneda, Hiroshi Kobayashi
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Publication number: 20130308224Abstract: 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: ApplicationFiled: July 22, 2013Publication date: November 21, 2013Inventors: Takatoki SUGI, Tomohiro YONEDA, Hiroshi KOBAYASHI
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Publication number: 20130308226Abstract: 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: ApplicationFiled: July 22, 2013Publication date: November 21, 2013Applicant: Nidec CorporationInventors: Takatoki SUGI, Tomohiro YONEDA, Hiroshi KOBAYASHI
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Publication number: 20130308225Abstract: 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: ApplicationFiled: July 22, 2013Publication date: November 21, 2013Applicant: Nidec CorporationInventors: Takatoki SUGI, Tomohiro YONEDA, Hiroshi KOBAYASHI
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Patent number: 8587895Abstract: A bearing mechanism includes a shaft portion, a sleeve portion, a lower opposing portion, a lower outer ring-shaped portion, and an upper opposing portion. A lower seal portion serving as a pumping seal portion is provided in a lower seal gap between the sleeve portion and the lower outer ring-shaped portion. An upper seal portion is provided in an upper seal gap joined to an upper thrust gap. The lower portion of the sleeve portion includes a large-diameter portion and a small-diameter portion positioned below the large-diameter portion. The sleeve portion includes a communication path joined to the upper seal gap. The communication path includes an opening portion opened in a border between the large-diameter portion and the small-diameter portion. The outer peripheral portion of the lower opposing portion includes an outer periphery protrusion portion radially opposed to the small-diameter portion and axially opposed to the large-diameter portion.Type: GrantFiled: March 5, 2013Date of Patent: November 19, 2013Assignee: Nidec CorporationInventors: Akinobu Sumiji, Akihiro Kimura, Kunio Sakurada
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Patent number: 8587896Abstract: A base member of a motor includes a base body portion and a motor base portion. The motor base portion is made of a first kind of metal. The base body portion is made of a second kind of metal. The first kind of metal is larger in Young's modulus than the second kind of metal. The motor base portion includes a base through-hole and a base groove portion. A lead wire of a coil extends radially outward through the base through-hole and the base groove portion. Within the base groove portion, an insulating layer is arranged between the lead wire and a bottom surface of the base groove portion to cover a border between the motor base portion and the base body portion, an outer edge of the base groove portion, and an inner edge of the base body portion opposed to the outer edge.Type: GrantFiled: March 12, 2013Date of Patent: November 19, 2013Assignee: Nidec CorporationInventors: Takayuki Ishino, Akihiro Yudate
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Publication number: 20130301161Abstract: A base unit includes a stator, a wiring substrate, and a base portion. The base portion includes a tubular portion, a first recess portion surrounding the tubular portion, and first through-holes arranged within the first recess portion. The wiring substrate includes a connection portion arranged on an upper surface of the base portion and provided with lands, a power feeding portion arranged on a lower surface of the base portion, and an extension portion arranged to interconnect the connection portion and the power feeding portion. A first bonding layer is arranged between the connection portion and a bottom of the first recess portion to bond the connection portion and the bottom of the first recess portion. A second bonding layer is arranged between the power feeding portion and the lower surface of the base portion to bond the power feeding portion and the lower surface of the base portion.Type: ApplicationFiled: February 19, 2013Publication date: November 14, 2013Applicant: NIDEC CORPORATIONInventor: Shintaro SAEKI
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Patent number: 8582233Abstract: A spindle motor, which is for use in a disk drive apparatus which includes a housing including a base member and a cover member, includes a stationary portion and a rotating portion. The stationary portion includes a stationary shaft and the base member. The rotating portion includes a sleeve portion. The stationary shaft is inserted into the bearing hole. The stationary shaft includes an annular surface arranged to come into direct or indirect contact with the cover member, the annular surface being located higher than the sleeve portion and extending in a circumferential direction, and an upper protrusion arranged to be fixed to a cover inner circumferential surface defining a cover penetrating hole of the cover member, the upper protrusion protruding upward from the radial inner side of the annular surface. The base member includes a fixing portion arranged to directly or indirectly fix the cover member.Type: GrantFiled: January 28, 2013Date of Patent: November 12, 2013Assignee: Nidec CorporationInventor: Kazuhiko Fukushima
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Patent number: 8582232Abstract: A hard disk drive with a spindle motor that rotates a disk. When the disk drive is exposed to low temperatures a current can be provided to the spindle motor to heat the motor. For example, a DC current can be provided to the spindle motor. The current flowing through the spindle motor coil generates heat. The current can be provided for a predetermined time interval to sufficiently heat the spindle motor so that the fluid bearings of the motor can operate. The current is terminated and then an AC current is provided to the spindle motor to cause motor rotation.Type: GrantFiled: February 5, 2008Date of Patent: November 12, 2013Assignee: Seagate Technology LLCInventors: Brian D. Strom, SungChang Lee, Joerg Ferber
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Patent number: 8576512Abstract: A base member includes a base groove portion, a base through-hole, and an insulating sheet portion. The base groove portion is positioned on a lower surface of the base member. The base through-hole extends through the base member. The first insulating sheet portion is arranged on a bottom surface of the base groove portion. A lead wire extended from a coil is led out into the base groove portion through the base through-hole and is connected to a land portion. The base through-hole has a diameter which is different depending on the direction in which it extends. The base through-hole includes a major and minor axis extending in a direction where the diameter is largest and smallest respectively. A portion of an edge of the first insulating sheet portion on the lower surface of the base member intersects the major axis and covers a portion of the base through-hole.Type: GrantFiled: March 13, 2013Date of Patent: November 5, 2013Assignee: Nidec CorporationInventors: Kazuhiro Sato, Masahiro Shiraishi
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Patent number: 8567067Abstract: A method of manufacturing a bearing mechanism of a motor includes steps a)-e). In step a), a bearing assembly is assembled. In step b), an upper seal gap between an upper thrust portion and an upper hub annular portion is arranged to face downward to increase the width of a gap between an outer tubular portion and a flange portion, or a lower seal gap between the outer tubular portion and a lower hub annular portion is arranged to face downward to increase the width of a gap between the upper thrust portion and the flange portion. In step c), pressure in all gaps is reduced. In step d), lubricating oil is injected into the upper or lower seal gap which faces upward, and a predetermined time or longer is allowed to pass. In step e), pressure is returned to atmospheric pressure.Type: GrantFiled: January 19, 2012Date of Patent: October 29, 2013Assignee: Nidec CorporationInventors: Katsuki Yamaguchi, Shigeki Horiki, Yoshitsugu Hideshima, Akio Tatsumi, Akinobu Sumiji, Takehito Tamaoka, Kazushi Miura, Mitsuhiro Takemoto
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Publication number: 20130279044Abstract: A thin film piezoelectric element of the present invention includes a substrate and a piezoelectric thin film stack formed on the substrate. The piezoelectric thin film stack includes a top electrode layer, a bottom electrode layer and a piezoelectric layer sandwiched between the top electrode layer and the bottom electrode layer, wherein the piezoelectric layer includes a first piezoelectric layer and a second piezoelectric layer whose compositions have different phase structures. The present invention can obtain high piezoelectric constants, enhanced coercive field strength, thereby enabling larger applied field strength without depolarization and achieving a large stroke for its applied device.Type: ApplicationFiled: April 19, 2012Publication date: October 24, 2013Applicant: SAE Magnetics (H.K.) Ltd.Inventors: Wei XIONG, Panjalak Rokrakthong, Kenjiro Hata, Kazushi Nishiyama, Daisuke Iitsuka, Atsushi Iijima
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Patent number: 8564901Abstract: In the brushless motor, a hub has a cylindrical separating wall in between a yoke and two magnetic recording disks. The yoke is affixed to the inner surface of the separating wall of the hub using both a press-fit and adhesion. A first convex portion and a second convex portion are formed on the inner surface of the separating wall, and the yoke is pressed against these convex portions in the case where the yoke is press-fit. The first convex portion and the second convex portion are formed in a ring shape around the rotational axis of the motor. The diameter of the first convex portion is less than the diameter of the second convex portion.Type: GrantFiled: November 10, 2009Date of Patent: October 22, 2013Assignee: Samsung Electro-Mechanics Japan Advanced Technology Co., LtdInventors: Hiroshi Saito, Kazuhiro Matsuo
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Publication number: 20130271869Abstract: A magnetic recording head includes a main magnetic pole generating a recording magnetic field, a trailing shield, a recording coil generating a magnetic field and a high frequency oscillator. The trailing shield includes a magnetic region including a gap side end surface facing a write gap and a nonmagnetic film arranged in the vicinity of the write gap in the trailing shield, and within a plane including track width direction centers of the main magnetic pole and the high frequency oscillator and being perpendicular to a recording layer of a recording medium, a film thickness of the nonmagnetic film along a track moving direction is substantially equivalent to or more than a half of a distance from the gap side end surface to the nonmagnetic film.Type: ApplicationFiled: September 7, 2012Publication date: October 17, 2013Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Tomoko TAGUCHI, Takuya MATSUMOTO
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Publication number: 20130271870Abstract: In a spindle motor, a cup portion of a base member includes a cylindrical portion and a bottom plate portion. The cylindrical portion is concentric or substantially concentric with a central axis extending in a vertical direction. The bottom plate portion closes a bottom portion of the cylindrical portion. The bearing mechanism is accommodated in the cup portion. An adhesive is arranged between an outer circumferential surface of the bearing mechanism and an inner circumferential surface of the cylindrical portion. At least one of the outer circumferential surface of the bearing mechanism and the inner circumferential surface of the cylindrical portion includes an axially extending vertical groove. A communicating hole which is not filled with the adhesive is arranged in at least a portion of an inside of the vertical groove. The communicating hole extends continuously from an upper to a lower end portion of the vertical groove.Type: ApplicationFiled: February 25, 2013Publication date: October 17, 2013Applicant: NIDEC CORPORATIONInventors: Tsuchitsugu WATANABE, Tomohiro YOKOSAWA, Hirofumi TAKAYAMA, Takashi SHIMIZU, Sho FUKUHARA
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Publication number: 20130271871Abstract: A base unit includes a base member and a connector. The base member includes a bottom plate portion, a window portion, and a first groove. The first groove is defined in an upper surface of the bottom plate portion around the window portion. The connector includes a board portion and an electrode terminal. The board portion is arranged on the upper surface of the bottom plate portion to cover the window portion and the first groove. The electrode terminal is arranged to overlap with the window portion in the axial direction. An adhesive is arranged between the upper surface of the bottom plate portion and the lower surface of the board portion. The adhesive is arranged to extend continuously in an annular or substantially annular shape around the window portion while being arranged in at least a portion of the first groove.Type: ApplicationFiled: February 25, 2013Publication date: October 17, 2013Applicant: Nidec CorporationInventors: Tsuchitsugu WATANABE, Tomohiro YOKOSAWA, Hirofumi TAKAYAMA, Takashi SHIMIZU, Sho FUKUHARA
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Patent number: 8553355Abstract: A motor includes a stationary portion and a rotating portion. The stationary portion includes a shaft portion and an upper thrust portion. The upper thrust portion includes a tubular first outer circumferential surface arranged radially outside the upper thrust portion, and a tubular second outer circumferential surface arranged above the first outer circumferential surface. The rotating portion includes a sleeve portion, a tubular portion, and an annular cover portion. The annular cover portion includes a plate portion and an inner annular projecting portion arranged to project upward or downward. An inner circumferential surface of the inner annular projecting portion is arranged above an inner circumferential surface of the tubular portion. An upper seal portion includes a surface of a lubricating oil located therein.Type: GrantFiled: January 11, 2013Date of Patent: October 8, 2013Assignee: Nidec CorporationInventors: Junya Mizukami, Takayuki Oe, Yoichi Sekii, Naoki Sabashi, Takehito Tamaoka, Takashi Yamamoto, Shigeki Horiki, Kazushi Miura, Mitsuhiro Takemoto, Kazuhiro Sato
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Patent number: 8553354Abstract: A disk driving apparatus includes a base member, a hub member, and a fluid bearing unit. The base member has a head movement region on which a head unit is to be mounted such that a head portion of the head unit can be moved along the radial direction of a recording face in a reciprocating manner while facing the recording face of a recording disk to be mounted on the hub member, and a recessed housing portion housing the fluid bearing unit such that it surrounds at least a part of a rotor unit supported by the fluid bearing unit. Furthermore, the base member has an inhibiting wall at a boundary between the head movement region and the recessed housing portion so as to prevent a lubricant fluid from migrating toward the recording disk side.Type: GrantFiled: October 2, 2012Date of Patent: October 8, 2013Assignee: Samsung Electro-Mechanics Japan Advanced Technology Co., Ltd.Inventors: Tetsuo Kitamura, Yuji Omura, Aikra Suzuki
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Publication number: 20130258522Abstract: A stationary unit of a brushless motor includes a flat armature and a base member arranged to support the armature. The armature includes a power supply portion to which a lead wire is connected. The base member includes a wall portion and a window portion. The wall portion is radially opposed to an outer edge portion of the armature. The window portion is positioned below the power supply portion to axially extend through the base member. An adhesive agent exists between the wall portion and the outer edge portion of the armature. Accordingly, the base member and the armature are strongly fixed to each other. Further, a sealing material is interposed between a whole periphery of an edge of the window portion and the armature, so that the window portion is sealed. (FIG.Type: ApplicationFiled: February 28, 2013Publication date: October 3, 2013Applicant: NIDEC CORPORATIONInventors: Toshikazu Himeno, Hongbing Du, Junichi Hashimoto, Kazuya Enokizono
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Publication number: 20130250453Abstract: According to one embodiment, a perpendicular magnetic recording medium including a soft magnetic under layer, a nonmagnetic seed layer consisting of AgGe, a nonmagnetic interlayer made of Ru or an Ru alloy, and a perpendicular magnetic recording layer, laminated on the nonmagnetic substrate is provided. The nonmagnetic seed layer is an layer containing Ag grains having an fcc structure and an amorphous Ge grain boundary, and the Ag grain surface is higher than the Ge grain boundary surface.Type: ApplicationFiled: August 28, 2012Publication date: September 26, 2013Applicant: KABUSHIKI KAISHA TOSHIBAInventor: Takeshi IWASAKI
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Patent number: 8542459Abstract: A motor includes a seal cap and a tubular portion. The seal cap includes a first seal cap lower surface which is an annular surface facing axially downward, and a second seal cap lower surface which is an annular surface facing axially downward and arranged radially outward of the first seal cap lower surface. The tubular portion includes a first tubular portion upper surface which is an annular surface arranged axially opposite to the first seal cap lower surface, and a second tubular portion upper surface which is an annular surface arranged radially outward of the first tubular portion upper surface and in contact with the second seal cap lower surface. The first tubular portion upper surface includes an oil-repellent film region covered with an oil-repellent film. A substantially annular radially extending gap is defined between the first tubular portion upper surface and the first seal cap lower surface.Type: GrantFiled: January 11, 2013Date of Patent: September 24, 2013Assignee: Nidec CorporationInventors: Junya Mizukami, Takayuki Oe, Yoichi Sekii, Naoki Sabashi, Takehito Tamaoka, Takashi Yamamoto, Shigeki Horiki, Kazushi Miura, Mitsuhiro Takemoto, Hironori Ando, Katsuya Takahashi
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Publication number: 20130242429Abstract: A motor includes a shaft component including an inner shaft portion and an outer shaft portion. A radial gap is defined between a sleeve portion and the outer shaft portion. A radial dynamic pressure generating groove array is arranged on at least one surface of an inner circumferential surface of the sleeve portion and an outer circumferential surface of the outer shaft portion, which define the radial gap. The radial dynamic pressure generating groove array includes an upper and lower radial dynamic pressure generating groove array. The inner shaft portion is fixed to the outer shaft portion in an interference fit. An axial range of a fixing region of the inner shaft portion and the outer shaft portion which is in the interference fit is included in a range between the upper and lower radial dynamic pressure generating groove array.Type: ApplicationFiled: September 13, 2012Publication date: September 19, 2013Applicant: NIDEC CORPORATIONInventors: Shuji Iwasaki, Yoichi Sekii, Takehito Tamaoka, Hideki Nishimura, Kazuto Miyajima, Takuro Iguchi, Kazuhiro Sato, Takeyuki Shuto
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Publication number: 20130235489Abstract: An example rotating device is a disk drive device that includes a base, a hub on which a recording disk is to be mounted and which rotates relative to the base, and a fluid dynamic bearing unit that allows the hub to rotate relative to the base. The fluid dynamic bearing unit includes a shaft that performs relative rotation and a cylindrical member that encircles the shaft, the cylindrical member includes a thrust dynamic pressure generating groove which is provided in one end face of the cylindrical member and which generates thrust dynamic pressure, and the thrust dynamic pressure generating groove includes a cut-and-machined face.Type: ApplicationFiled: March 7, 2013Publication date: September 12, 2013Applicant: ALPHANA TECHNOLOGY CO., LTD.Inventor: Hisayuki AOSHIMA
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Patent number: 8526879Abstract: A communications device for wireless communication with another device, the communications device having a) a first part having a first housing and a first induction coil for providing an inductive coupling to the other device, and b) a second part having a second induction coil adapted to be inductively coupled to said first induction coil and to said other device when mounted on or near said first housing. Provided is a relatively simple mechanical interface for an inductively coupled link between a communications device and another device. The second part is adapted to be detachably attachable to the first housing. An advantage is that no connector is needed whereby a simpler and more reliable device is provided. The consequences of wear of the connector leading to increased contact resistance and/or failure of the electrical connection is avoided.Type: GrantFiled: April 11, 2008Date of Patent: September 3, 2013Assignee: Oticon A/SInventors: Niels Kristian Kristiansen, Sune Pelle Borregaard, Torkil Filholm
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Publication number: 20130222947Abstract: A removable cover assembly for a data storage device comprises a first cover coupled with a casing base of a data storage device via a plurality of screws. A second cover is disposed upon a rib of the casing base and is coupled with the rib. The second cover is configured with a groove which delineates a perimeter separating an interior region of the second cover from an exterior region of the second cover. A space between the first cover and the casing base is filled with a low-density gas. The groove defines the region in the second cover in which separation of the interior region from the exterior region is to occur to expose the screws.Type: ApplicationFiled: February 29, 2012Publication date: August 29, 2013Inventors: Taisuke Sugii, Masaru Muranishi, Nobuyuki Isoshima, Takehiko Eguchi
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Patent number: 8520335Abstract: In a motor, a stationary portion includes a shaft portion and an upper thrust portion arranged to define a single continuous monolithic member together with the shaft portion, and arranged to extend radially outward from an upper portion of the shaft portion. The shaft portion includes a female screw portion recessed axially downward from an upper end thereof. An upper end of the single continuous monolithic member defined by the shaft portion and the upper thrust portion includes an upper end annular surface arranged to extend radially outward from the female screw portion perpendicularly or substantially perpendicularly to the central axis. An outside diameter of the upper end annular surface is greater than a diameter of an outer circumferential surface of the shaft portion.Type: GrantFiled: August 5, 2011Date of Patent: August 27, 2013Assignee: Nidec CorporationInventors: Junya Mizukami, Takayuki Oe, Yoichi Sekii, Naoki Sabashi, Takehito Tamaoka, Takashi Yamamoto, Kazunori Usui, Akira Mukai
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Publication number: 20130215531Abstract: 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: ApplicationFiled: March 25, 2013Publication date: August 22, 2013Applicant: Samsung Electro-Mechanics Japan Advanced Technology Co., Ltd.Inventors: Takuji Yamada, Yuji Omura, Mitsuo Kodama
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Patent number: 8514515Abstract: A motor includes a shaft component, an upper plate portion, a lower plate portion, and a sleeve portion. The shaft component includes an inner shaft portion and an outer shaft portion. The upper plate portion defines a single monolithic member with one of the inner shaft portion and the outer shaft portion. The lower plate portion defines a single monolithic member with the other of the inner shaft portion and the outer shaft portion. The sleeve portion is disposed between the upper plate portion and the lower plate portion. A radial gap is defined between the sleeve portion and the outer shaft portion. A fixing range in which the outer shaft portion and the inner shaft portion radially overlap is arranged. At least a portion in an axial direction of the fixing range radially overlaps with an existing range in the axial direction of the radial gap.Type: GrantFiled: September 13, 2012Date of Patent: August 20, 2013Assignee: Nidec CorporationInventors: Shuji Iwasaki, Yoichi Sekii, Takehito Tamaoka, Hideki Nishimura, Kazuto Miyajima, Takuro Iguchi, Kazuhiro Sato, Takeyuki Shuto
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Patent number: 8508884Abstract: A spindle motor includes a stationary portion and a rotating portion. The rotating portion includes a magnet arranged around a central axis extending in a vertical direction. The stationary portion includes a base member and a magnetic member arranged below the magnet and fixed to the base member. The base member includes an upper surface extending out perpendicularly or substantially perpendicularly to the central axis, and a wall surface extending in an axial direction. The magnetic member includes an annular plate portion arranged on the base member and a projecting portion arranged to extend downward from the plate portion. At least a portion of the projecting portion is arranged to be in contact with the wall surface. An adhesive is arranged between the plate portion and the upper surface of the base member and between the projecting portion and the wall surface.Type: GrantFiled: December 5, 2012Date of Patent: August 13, 2013Assignee: Nidec CorporationInventors: Yoichi Sekii, Hirokazu Shirai, Junya Mizukami, Kazuyoshi Saito, Hideki Nishimura, Atsushi Yawata
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Patent number: 8508883Abstract: A motor includes a shaft portion, an upper plate cylindrical portion, a lower plate cylindrical portion, and a sleeve portion disposed between an upper plate portion and a lower plate portion. The sleeve portion includes an inner sleeve cylindrical portion and an outer sleeve cylindrical portion. An upper seal portion is arranged between the outer circumferential surface of the upper plate cylindrical portion and the inner circumferential surface of the outer sleeve cylindrical portion. A lower seal portion is arranged between the outer circumferential surface of the outer sleeve cylindrical portion and the inner circumferential surface of the lower plate cylindrical portion. At least a portion of the upper seal portion and at least a portion of the lower seal portion radially overlap with a radial gap between the outer circumferential surface of the shaft portion and the inner circumferential surface of the inner sleeve cylindrical portion.Type: GrantFiled: September 13, 2012Date of Patent: August 13, 2013Assignee: Nidec CorporationInventors: Takehito Tamaoka, Shuji Iwasaki, Yoichi Sekii, Hideki Nishimura
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Patent number: 8508882Abstract: A spindle motor 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 to be rotatable. 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: GrantFiled: August 7, 2012Date of Patent: August 13, 2013Assignee: Nidec CorporationInventors: Takehito Tamaoka, Hiroyuki Abe
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Publication number: 20130194701Abstract: A spindle motor, which is for use in a disk drive apparatus which includes a housing including a base member and a cover member, includes a stationary portion and a rotating portion. The stationary portion includes a stationary shaft and the base member. The rotating portion includes a sleeve portion. The stationary shaft is inserted into the bearing hole. The stationary shaft includes an annular surface arranged to come into direct or indirect contact with the cover member, the annular surface being located higher than the sleeve portion and extending in a circumferential direction, and an upper protrusion arranged to be fixed to a cover inner circumferential surface defining a cover penetrating hole of the cover member, the upper protrusion protruding upward from the radial inner side of the annular surface. The base member includes a fixing portion arranged to directly or indirectly fix the cover member.Type: ApplicationFiled: January 28, 2013Publication date: August 1, 2013Applicant: NIDEC CORPORATIONInventor: NIDEC CORPORATION
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Publication number: 20130188280Abstract: According to one embodiment, a disk drive includes a case including a base with a bottom wall, a drive motor on the bottom wall of the base, a plurality of disk recording mediums rotatable by the drive motor, a magnetic head configured to perform data processing on the recording mediums, a carriage on the bottom wall of the base, configured to support the magnetic head for movement relative to the recording mediums, a drive section including a yoke and a magnet on the bottom wall of the base and configured to drive the carriage, and a spoiler including a main body, which includes a magnetic shield member between the yoke and the recording mediums, and a baffle plate extending from the main body and between the adjacent disk recording mediums.Type: ApplicationFiled: July 17, 2012Publication date: July 25, 2013Applicant: KABUSHIKI KAISHA TOSHIBAInventor: Kenichi SAWANAKA
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Publication number: 20130182351Abstract: A perpendicular magnetic recording medium according to an embodiment includes a substrate and perpendicular magnetic recording layer. The perpendicular magnetic recording layer includes a recording portion and non-recording portion. The recording portion has patterns regularly arranged in the longitudinal direction, and includes magnetic layers containing Fe or Co and Pt as main components, and at least one additive component selected from Ti, Si, Al, and W. The non-recording portion includes oxide layers formed by oxidizing the side surfaces of the magnetic layers, and nonmagnetic layers formed between the oxide layers.Type: ApplicationFiled: July 19, 2012Publication date: July 18, 2013Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Takeshi IWASAKI, Kazutaka TAKIZAWA, Akira WATANABE, Kaori KIMURA, Akihiko TAKEO
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Patent number: 8489021Abstract: An apparatus is disclosed. The apparatus comprises a communication interface unit configured to receive reference biosignal data, and a wireless interface unit configured to receive a plurality of candidate biosignal transmissions from candidate biosignal transmitters. A comparison unit of the apparatus is configured to compare the reference biosignal data with the candidate biosignal transmissions, thus resulting in comparison data. The wireless interface unit is configured to execute a pairing protocol with a candidate biosignal transmitter of a candidate biosignal transmission by utilizing the comparison data.Type: GrantFiled: February 23, 2010Date of Patent: July 16, 2013Assignee: Polar Electro OyInventors: Niclas Granqvist, Juhani Kemppainen, Jukka Jaatinen, Pertti Puolakanaho