Patents by Inventor Hiroyuki Yonei
Hiroyuki Yonei has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 7460334Abstract: Spindle motors, one example being furnished with: a housing member perforated by a round through-hole; a sleeve disposed within the housing through-hole; a shaft; fluid dynamic-pressure bearings that support the shaft against the sleeve letting one rotate relative to the other; and an electroconductive member contacting on the housing member and the sleeve, and electrically interconnecting the two. An elastic limb that in its elastically deformed state contacts on at least either the housing member or the sleeve is formed on at least either the inner periphery or the outer periphery of the electroconductive member. By the spring force of the elastic limb, the electroconductive member contacts on the housing member and the sleeve, maintaining elastic stress between them.Type: GrantFiled: June 6, 2005Date of Patent: December 2, 2008Assignee: Nidec CorporationInventors: Hiroyuki Yonei, Kunihiko Hashimoto
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Patent number: 7254882Abstract: The present invention provides a method for sealing a metal housing member. A housing through hole is formed in a housing member for a lead wire sealing device. The housing member is provided with a housing through hole formed on the metal housing member and penetrates from a closed space to an open space. A resin coating layer is formed to cover a lower surface of the housing member. A metal surface exposed part is formed on a part of the resin coating layer. The circuit board having a board aperture is mounted on the metal surface exposed part via an adhesive layer while overlapping with the board aperture on the housing through hole. The lead wire is inserted in the housing through hole and the board aperture that are overlapped with each other. The sealing material is provided on the circuit board to cover the board aperture.Type: GrantFiled: August 3, 2006Date of Patent: August 14, 2007Assignee: Nidec CorporationInventors: Tokichi Ito, Nobuaki Watanabe, Yoshito Oku, Hiroyuki Yonei
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Publication number: 20060265871Abstract: A first metal housing member 111 is provided with a bottom plate part 1111 and a resin coating layer 1112 formed on a lower surface of the bottom plate part 1111. To a board mounted part 1113 which is a metal surface exposed part exposed from the resin coating layer 1112 around a housing through hole 113, an FPC 114 is mounted via an adhesive layer 115. A lead wire 1413 of a stator windings 1414 that is inserted in a board aperture 1144 is connected to the FPC 114 by a sealing material 117 as a solder and the board aperture 1144 is covered with the sealing material 117 to seal the housing through hole 113. A motor unit 10 can securely seal the housing through hole 113 by enhancing adhesiveness between the FPC 114 and the first metal housing member 111.Type: ApplicationFiled: August 3, 2006Publication date: November 30, 2006Applicant: NIDEC CORPORATIONInventors: Tokichi Ito, Nobuaki Watanabe, Yoshito Oku, Hiroyuki Yonei
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Patent number: 7105963Abstract: A first metal housing member 111 is provided with a bottom plate part 1111 and a resin coating layer 1112 formed on a lower surface of the bottom plate part 1111. To a board mounted part 1113 which is a metal surface exposed part exposed from the resin coating layer 1112 around a housing through hole 113, an FPC 114 is mounted via an adhesive layer 115. A lead wire 1413 of a stator windings 1414 that is inserted in a board aperture 1144 is connected to the FPC 114 by a sealing material 117 as a solder and the board aperture 1144 is covered with the sealing material 117 to seal the housing through hole 113. A motor unit 10 can securely seal the housing through hole 113 by enhancing adhesiveness between the FPC 114 and the first metal housing member 111.Type: GrantFiled: May 3, 2005Date of Patent: September 12, 2006Assignee: Nidec CorporationInventors: Tokichi Ito, Nobuaki Watanabe, Yoshito Oku, Hiroyuki Yonei
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Publication number: 20060138886Abstract: A first metal housing member 111 is provided with a bottom plate part 1111 and a resin coating layer 1112 formed on a lower surface of the bottom plate part 1111. To a board mounted part 1113 which is a metal surface exposed part exposed from the resin coating layer 1112 around a housing through hole 113, an FPC 114 is mounted via an adhesive layer 115. A lead wire 1413 of a stator windings 1414 that is inserted in a board aperture 1144 is connected to the FPC 114 by a sealing material 117 as a solder and the board aperture 1144 is covered with the sealing material 117 to seal the housing through hole 113. A motor unit 10 can securely seal the housing through hole 113 by enhancing adhesiveness between the FPC 114 and the first metal housing member 111.Type: ApplicationFiled: May 3, 2005Publication date: June 29, 2006Applicant: NIDEC CORPORATIONInventors: Tokichi Ito, Nobuaki Watanabe, Yoshito Oku, Hiroyuki Yonei
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Publication number: 20050286167Abstract: Spindle motors, one example being furnished with: a housing member perforated by a round through-hole; a sleeve disposed within the housing through-hole; a shaft; fluid dynamic-pressure bearings that support the shaft against the sleeve letting one rotate relative to the other; and an electroconductive member contacting on the housing member and the sleeve, and electrically interconnecting the two. An elastic limb that in its elastically deformed state contacts on at least either the housing member or the sleeve is formed on at least either the inner periphery or the outer periphery of the electroconductive member. By the spring force of the elastic limb, the electroconductive member contacts on the housing member and the sleeve, maintaining elastic stress between them.Type: ApplicationFiled: June 6, 2005Publication date: December 29, 2005Applicant: Nidec CorporationInventors: Hiroyuki Yonei, Kunihiko Hashimoto
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Patent number: 5453890Abstract: A low airflow hard disk apparatus comprises a base, a cover member, a rotational portion disposed in a disk chamber, a hard disk held by and rotatable with the rotational portion, a first projection portion disposed on the lower surface of the cover member and facing toward the upper surface of the hard disk, and a second projection portion disposed on the upper surface of the base and facing toward the lower surface of the hard disk. The first and second projection portions, preferably radially extending fins, prevent an air flow from generating by the rotation of the hard disk.Type: GrantFiled: March 9, 1994Date of Patent: September 26, 1995Assignee: Nippon Densan CorporationInventors: Kiyoyoshi Takegami, Yoichi Mori, Hirotada Itoi, Itsuo Miyaji, Hiroyuki Yonei, Kihachiro Ohta
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Patent number: 5333079Abstract: An annular recess is formed in a base which constitutes a disk chamber, and an armature constituting a spindle motor for driving a hard disk and composed of a stator core and a stator coil and a field device composed of a rotor yoke and a rotor magnet are substantially accommodated in the annular recess. As a result, the height of a portion of a hard disk apparatus which constitutes a radial directional gap type spindle motor can be minimized and therefore the overall height of the apparatus can be minimized. Hence, the thickness and the size of a computer apparatus or the like which includes the hard disk apparatus can be reduced.Type: GrantFiled: July 28, 1992Date of Patent: July 26, 1994Assignee: Nippon Densan CorporationInventors: Kiyoyoshi Takegami, Itsuo Miyaji, Hiroyuki Yonei, Kihachiro Ohta
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Patent number: 5325004Abstract: A spindle motor includes a housing, a shaft member fixed in the housing, a rotor rotatably supported on the shaft member, a rotor magnet mounted on the rotor, and a stator placed facing with the rotor magnet. The housing and the shaft member are made of materials different in hardness and a sleeve having substantially the same level of hardness as the shaft member is placed between the housing and the shaft member. A bushing is provided between bearing members and the rotor which is rotatably supported by the bearing members. The bushing and a yoke which is mounted on the rotor are secured together in the axial middle part of the bushing. In addition, through holes which enable communications between the interior and exterior area of the motor are provided in the bushing.Type: GrantFiled: May 15, 1992Date of Patent: June 28, 1994Assignee: Nippon Densen CorporationInventors: Yoichi Mori, Hiroyuki Yonei, Takashi Yokoyama, Kiyoharu Noguchi
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Patent number: 5317225Abstract: A spindle motor comprising a bracket, a hub which is rotational relative to the bracket, and bearing means disposed between the bracket and the hub, wherein the hub has a hub main body made of aluminum or an aluminum alloy, and a holder formed from a magnetic material, and wherein a rotor magnet is mounted on the inner surface of the holder. A ring-shaped recess is provided on the inner surface of the bracket, and the hub and a part of the rotor magnet extend into the ring-shaped recess. Improvements having been made on a disk clamp mechanism for mounting a recording disk on the hub of the spindle motor.Type: GrantFiled: December 13, 1991Date of Patent: May 31, 1994Assignee: Nippon Densan CorporationInventors: Itsuo Miyaji, Hiroyuki Yonei
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Patent number: 5256922Abstract: A spindle motor comprises a housing, a hub arranged for rotation on the housing, a couple of bearings interposed between the housing and the hub, a rotor magnet mounted to the hub, and a stator mounted to the housing so as to face the rotor magnet, in which at least one of the two bearings is of single seal type having a seal at one side. Also, a flexible pc film is provided for supply of electric energy to the stator and arranged for improved connection to an armature coil of the stator.Type: GrantFiled: April 8, 1992Date of Patent: October 26, 1993Assignee: Nippon Densan CorporationInventors: Tadahiro Tanaka, Hiroyuki Yonei, Yoichi Mori, Yoshiyuki Kodaira
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Patent number: 5214331Abstract: A spindle motor comprises a housing, a hub which is rotatable relative to the housing, a rotor magnet mounted on the hub, and a stator disposed facing the rotor magnet. A coil holding member for extending a lead section of an armature coil of the stator to the outside thereof is disposed in the housing. Female screw holes into which fixing screws for mounting clamp members are screwed and through holes connecting with the female screw holes are formed in the hub. Furthermore, supporting projections extending toward the housing are disposed in the stator core of the stator, and such supporting projections are supported in the housing.Type: GrantFiled: August 23, 1991Date of Patent: May 25, 1993Assignee: Nippon Densan CorporationInventors: Hideki Nishimura, Hiroyuki Yonei, Makoto Yoshida
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Patent number: 5214326Abstract: A magnetic disk drive device has a spindle motor for rotatingly driving magnetic disks in a predetermined direction, and a clamp member for mounting the disks on the spindle motor. The spindle motor has a hub rotatably supported through bearings and having a portion for mounting the magnetic disks, a rotor magnet carried by the hub, a stator disposed to oppose the rotor magnet, and magnetic fluid seal arrangement for preventing scattering of lubricant from the bearing means. The magnetic disk drive device further has a magnetic shield on the radially outer side of the magnetic fluid seal arrangement. One of the bearings rotatably supporting the hub may be charged with a lubricant having a comparatively low viscosity, while the other bearing may be charged with a lubricant having a comparatively high viscosity.Type: GrantFiled: September 3, 1991Date of Patent: May 25, 1993Assignee: Nippon Densan CorporationInventor: Hiroyuki Yonei
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Patent number: 5153470Abstract: A spindle motor includes a bracket, a shaft member fixed to the bracket, a hub member rotatably mounted on the shaft member with a bearing member therebetween, a rotor magnet mounted on the hub member, a stator disposed in opposed relation to the rotor magnet, and a magnetic fluid sealing assembly disposed on on outer side of the bearings. The shaft member has an elastic sealing member which seals a through-hole formed in the shaft.Type: GrantFiled: December 10, 1991Date of Patent: October 6, 1992Assignee: Nippon Densan CorporationInventors: Itsuo Miyaji, Takeshi Uda, Hiroyuki Yonei
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Patent number: 5138209Abstract: Disclosed is a spindle motor comprising: a housing, a hub member which is rotatable with respect to the housing and to which a recording member is attached, and a bearing arranged between the housing and the hub member and having an outer member which is rotatably attached thereto through the intermediation of a plurality of spherical members, the hub member being fixed to the above-mentioned outer member by press fitting or shrinkage fitting, and the inner periphery of the hub member being equipped with an annular recess in correspondence with a ball lodging grooved formed on the outer member.Type: GrantFiled: February 6, 1991Date of Patent: August 11, 1992Assignee: Nippon Densan CorporationInventors: Masanobu Chuta, Hiroyuki Yonei, Hideki Nishimura, Yoshikiyo Nagashima
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Patent number: 5134331Abstract: A spindle motor includes a bracket, a shaft member fixed to the bracket, a hub member rotatably mounted on the shaft member with a bearing member therebetween, a rotor magnet mounted on the hub member, a stator disposed in opposed relation to the rotor magnet, and a magnetic fluid sealing means disposed on an outer side of the bearing means. The shaft member or bracket has a magnetized portion for suppressing a magnetic flux leaking from a magnetic fluid retaining means of the magnetic fluid sealing means.Type: GrantFiled: May 28, 1991Date of Patent: July 28, 1992Assignee: Nippon Densan CorporationInventors: Itsuo Miyaji, Takeshi Uda, Hiroyuki Yonei
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Patent number: 4980587Abstract: A spindle motor comprises a central shaft, a hub rotatable about the shaft and having a central bore which is open at one end, a first bearing fitted in the bore to surround the shaft, a second bearing disposed within the bore to surround the shaft and axially spaced from the first bearing to be positioned closer to the open end of the bore, and an auxiliary bush fitted in the bore to fittingly receive the second bearing. The bush has an inward flange axially interposed between the first and second bearings. The flange provides a first surface in face-to-face contact with an outer race of the first bearing. The flange further provides a second surface parallel to the first surface and in face-to-face contact with an outer race of the second bearing.Type: GrantFiled: June 5, 1989Date of Patent: December 25, 1990Assignee: Nippon Densan CorporationInventors: Hiroyuki Yonei, Yoshito Oku, Susumu Terada