Patents by Inventor Hiroaki Shigenaga

Hiroaki Shigenaga 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).

  • Structure to prevent deformation of magnetic disk device housing
    Patent number: 7733599
    Abstract: Embodiments of the invention provide a magnetic disk unit in which there has been adopted a structure fixing a base and a top plate and preventing a deformation by a bimetal effect. In one embodiment, the magnetic disk unit includes a magnetic disk; a head drive mechanism in which is mounted a head accessing the magnetic disk; a base accommodating the magnetic disk and the head drive mechanism, and possessing a flat part, in which a threaded hole has been formed, in a circumference of an opening edge; and a top cover which is formed by a material whose thermal expansion coefficient differs from that of the base, in which there is provided an escape hole, for a screw, position-aligned to the threaded hole of the flat part, and which is attached to the base by the screw penetrating through the threaded hole and the escape hole for the screw.
    Type: Grant
    Filed: August 3, 2006
    Date of Patent: June 8, 2010
    Assignee: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Hiroaki Shigenaga, Sunao Yonekawa, Masao Iwakura, Masami Miyatake
  • Structure to prevent deformation of magnetic disk device housing
    Publication number: 20070047130
    Abstract: Embodiments of the invention provide a magnetic disk unit in which there has been adopted a structure fixing a base and a top plate and preventing a deformation by a bimetal effect. In one embodiment, the magnetic disk unit includes a magnetic disk; a head drive mechanism in which is mounted a head accessing the magnetic disk; a base accommodating the magnetic disk and the head drive mechanism, and possessing a flat part, in which a threaded hole has been formed, in a circumference of an opening edge; and a top cover which is formed by a material whose thermal expansion coefficient differs from that of the base, in which there is provided an escape hole, for a screw, position-aligned to the threaded hole of the flat part, and which is attached to the base by the screw penetrating through the threaded hole and the escape hole for the screw.
    Type: Application
    Filed: August 3, 2006
    Publication date: March 1, 2007
    Applicant: Hitachi Global Storage Technologies
    Inventors: Hiroaki Shigenaga, Sunao Yonekawa, Masao Iwakura, Masami Miyatake