Patents by Inventor Shunichi Togashi

Shunichi Togashi 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).

  • Production method for sintered bearing member, fluid dynamic pressure bearing device, and spindle motor
    Patent number: 7251891
    Abstract: A production method for sintered bearing member comprises: compacting a metal powder into a green compact, sintering the green compact into a sintered compact; impregnating a resin solvent into the sintered compact, and removing the resin solvent adhering to a surface of the sintered compact, thereby exposing a matrix as sintered on a surface of the sintered compact. Pores existing in portions other than the surface are sealed with the resin.
    Type: Grant
    Filed: May 24, 2005
    Date of Patent: August 7, 2007
    Assignees: Hitachi Powdered Metals Co., Ltd., Minebea Co., Ltd.
    Inventors: Katsutoshi Nii, Shunichi Togashi, Tadashi Akahori
  • Spindle motor
    Patent number: 7218023
    Abstract: The spindle motor includes a rotational shaft 30 which has a conical portion 34, whose outer surface gradually widens toward a thrust dynamic pressure bearing 70, and a straight portion 33 with a fixed outer diameter. Radial dynamic pressure bearing 60 supports the radial load of the rotating shaft 30. The radial bearing has a conical bearing surface 64 and a straight bearing surface 63 corresponding to the conical portion 34 and the straight portion 33 of the rotating shaft 30, respectively. Rotating shaft 30 is supported and aligned during rotation by fluid dynamic forces generated by the conical portion 34.
    Type: Grant
    Filed: December 30, 2002
    Date of Patent: May 15, 2007
    Assignee: Minebea Co., Ltd.
    Inventors: Jun Hirose, Katsutoshi Nii, Shunichi Togashi
  • Production method for sintered bearing member, fluid dynamic pressure bearing device, and spindle motor
    Publication number: 20050259898
    Abstract: A production method for sintered bearing member comprises: compacting a metal powder into a green compact, sintering the green compact into a sintered compact; impregnating a resin solvent into the sintered compact, and removing the resin solvent adhering to a surface of the sintered compact, thereby exposing a matrix as sintered on a surface of the sintered compact. Pores existing in portions other than the surface are sealed with the resin.
    Type: Application
    Filed: May 24, 2005
    Publication date: November 24, 2005
    Inventors: Katsutoshi Nii, Shunichi Togashi, Tadashi Akahori
  • Spindle motor
    Publication number: 20030132676
    Abstract: The spindle motor includes a rotational shaft 30 which has a conical portion 34, whose outer surface gradually widens toward a thrust dynamic pressure bearing 70, and a straight portion 33 with a fixed outer diameter. Radial dynamic pressure bearing 60 supports the radial load of the rotating shaft 30. The radial bearing has a conical bearing surface 64 and a straight bearing surface 63 corresponding to the conical portion 34 and the straight portion 33 of the rotating shaft 30, respectively. Rotating shaft 30 is supported and aligned during rotation by fluid dynamic forces generated by the conical portion 34.
    Type: Application
    Filed: December 30, 2002
    Publication date: July 17, 2003
    Applicant: Minebea Co., Ltd.
    Inventors: Jun Hirose, Katsutoshi Nii, Shunichi Togashi