Patents by Inventor Nobuyoshi Maekawa

Nobuyoshi Maekawa 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).

  • Apparatus for centering the magnetic disc in a magnetic disc drive
    Patent number: 5121272
    Abstract: A disc drive for a disc including a disc rotating apparatus comprising a rotating shaft for being received within a first aperture of the disc. A spindle is affixed to the shaft. The spindle has a surface disposed in a plane perpendicular to the shaft, for supporting the disc. A disc driving means includes a position controlling member received in a second aperture of the disc, a rigid member for controlling the position of the position controlling member, and a biasing member for urging the rigid member in at least one direction so that the position controlling member engages the disc. A centering force to center the disc on the disc rotating apparatus is produced due to the action of the position controlling member on the disc. The biasing member may be configured so as to act upon the rigid member in an additional direction to produce an additional centering force component when the position controlling member engages the disc, thus urging sides of the first aperture of the disc against the rotating shaft.
    Type: Grant
    Filed: September 8, 1989
    Date of Patent: June 9, 1992
    Assignee: Seiko Epson Corporation
    Inventors: Nobuyoshi Maekawa, Hideya Yokouchi, Tomoe Aruga, Tadashi Sugiyama
  • Disc drive
    Patent number: 4903155
    Abstract: A disc drive for a disc including a disc rotating apparatus comprising a rotating shaft for being received within a first aperture of the disc. A spindle is affixed to the shaft. The spindle has a surface disposed in a plane perpendicular to the shaft, for supporting the disc. The disc drive includes a position controlling member received in a second aperture of the disc, a rigid member for controlling the position of the position controlling member, and a biasing member for urging the rigid member in at least one direction so that the position controlling member engages the disc. A centering force to center the disc on the disc rotating apparatus is produced due to the action of the position controlling member on the disc. The biasing member may be configured so as to act upon the rigid member in an additional direction to produce an additional centering force component when the position controlling member engages the disc, thus urging sides of the first aperture of the disc against the rotating shaft.
    Type: Grant
    Filed: February 28, 1989
    Date of Patent: February 20, 1990
    Assignee: Seiko Epson Corporation
    Inventors: Nobuyoshi Maekawa, Hideya Yokouchi, Tomoe Aruga, Tadashi Sugiyama
  • Disc drive
    Patent number: 4825314
    Abstract: A disc drive for a disc including a disc rotating apparatus comprising a rotating shaft for being received within a first aperture of the disc. A spindle is affixed to the shaft. The spindle has a surface disposed in a plane perpendicular to the shaft, for supporting the disc. The disc drive includes a position controlling member received in a second aperture of the disc, a rigid member for controlling the position of the position controlling member, and a biasing member for urging the rigid member in at least one direction so that the position controlling member engages the disc. A centering force to center the disc on the disc rotating apparatus is produced due to the action of the position controlling member on the disc. The biasing member may be configured so as to act upon the rigid member in an additional direction to produce an additional centering force component when the position controlling member engages the disc, thus urging sides of the first aperture of the disc against the rotating shaft.
    Type: Grant
    Filed: February 22, 1988
    Date of Patent: April 25, 1989
    Assignee: Seiko Epson Kabushiki Kaisha
    Inventors: Nobuyoshi Maekawa, Hideya Yokouchi, Tomoe Aruga, Tadashi Sugiyama