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).

  • Patent number: 7460334
    Abstract: 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: Grant
    Filed: June 6, 2005
    Date of Patent: December 2, 2008
    Assignee: Nidec Corporation
    Inventors: Hiroyuki Yonei, Kunihiko Hashimoto
  • Patent number: 7254882
    Abstract: 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: Grant
    Filed: August 3, 2006
    Date of Patent: August 14, 2007
    Assignee: Nidec Corporation
    Inventors: Tokichi Ito, Nobuaki Watanabe, Yoshito Oku, Hiroyuki Yonei
  • Publication number: 20060265871
    Abstract: 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: Application
    Filed: August 3, 2006
    Publication date: November 30, 2006
    Applicant: NIDEC CORPORATION
    Inventors: Tokichi Ito, Nobuaki Watanabe, Yoshito Oku, Hiroyuki Yonei
  • Patent number: 7105963
    Abstract: 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: Grant
    Filed: May 3, 2005
    Date of Patent: September 12, 2006
    Assignee: Nidec Corporation
    Inventors: Tokichi Ito, Nobuaki Watanabe, Yoshito Oku, Hiroyuki Yonei
  • Publication number: 20060138886
    Abstract: 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: Application
    Filed: May 3, 2005
    Publication date: June 29, 2006
    Applicant: NIDEC CORPORATION
    Inventors: Tokichi Ito, Nobuaki Watanabe, Yoshito Oku, Hiroyuki Yonei
  • Publication number: 20050286167
    Abstract: 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: Application
    Filed: June 6, 2005
    Publication date: December 29, 2005
    Applicant: Nidec Corporation
    Inventors: Hiroyuki Yonei, Kunihiko Hashimoto
  • Patent number: 5453890
    Abstract: 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: Grant
    Filed: March 9, 1994
    Date of Patent: September 26, 1995
    Assignee: Nippon Densan Corporation
    Inventors: Kiyoyoshi Takegami, Yoichi Mori, Hirotada Itoi, Itsuo Miyaji, Hiroyuki Yonei, Kihachiro Ohta
  • Patent number: 5333079
    Abstract: 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: Grant
    Filed: July 28, 1992
    Date of Patent: July 26, 1994
    Assignee: Nippon Densan Corporation
    Inventors: Kiyoyoshi Takegami, Itsuo Miyaji, Hiroyuki Yonei, Kihachiro Ohta
  • Patent number: 5325004
    Abstract: 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: Grant
    Filed: May 15, 1992
    Date of Patent: June 28, 1994
    Assignee: Nippon Densen Corporation
    Inventors: Yoichi Mori, Hiroyuki Yonei, Takashi Yokoyama, Kiyoharu Noguchi
  • Patent number: 5317225
    Abstract: 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: Grant
    Filed: December 13, 1991
    Date of Patent: May 31, 1994
    Assignee: Nippon Densan Corporation
    Inventors: Itsuo Miyaji, Hiroyuki Yonei
  • Patent number: 5256922
    Abstract: 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: Grant
    Filed: April 8, 1992
    Date of Patent: October 26, 1993
    Assignee: Nippon Densan Corporation
    Inventors: Tadahiro Tanaka, Hiroyuki Yonei, Yoichi Mori, Yoshiyuki Kodaira
  • Patent number: 5214326
    Abstract: 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: Grant
    Filed: September 3, 1991
    Date of Patent: May 25, 1993
    Assignee: Nippon Densan Corporation
    Inventor: Hiroyuki Yonei
  • Patent number: 5214331
    Abstract: 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: Grant
    Filed: August 23, 1991
    Date of Patent: May 25, 1993
    Assignee: Nippon Densan Corporation
    Inventors: Hideki Nishimura, Hiroyuki Yonei, Makoto Yoshida
  • Patent number: 5153470
    Abstract: 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: Grant
    Filed: December 10, 1991
    Date of Patent: October 6, 1992
    Assignee: Nippon Densan Corporation
    Inventors: Itsuo Miyaji, Takeshi Uda, Hiroyuki Yonei
  • Patent number: 5138209
    Abstract: 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: Grant
    Filed: February 6, 1991
    Date of Patent: August 11, 1992
    Assignee: Nippon Densan Corporation
    Inventors: Masanobu Chuta, Hiroyuki Yonei, Hideki Nishimura, Yoshikiyo Nagashima
  • Patent number: 5134331
    Abstract: 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: Grant
    Filed: May 28, 1991
    Date of Patent: July 28, 1992
    Assignee: Nippon Densan Corporation
    Inventors: Itsuo Miyaji, Takeshi Uda, Hiroyuki Yonei
  • Patent number: 4980587
    Abstract: 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: Grant
    Filed: June 5, 1989
    Date of Patent: December 25, 1990
    Assignee: Nippon Densan Corporation
    Inventors: Hiroyuki Yonei, Yoshito Oku, Susumu Terada