Patents by Inventor Yuhji Kobayashi

Yuhji Kobayashi 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).

  • Ramp for use in information recording disk apparatus, and information recording disk apparatus
    Patent number: 6690548
    Abstract: A ramp wherein the amount of deformation in the front end edges of guiding parts caused by thermal expansion. The ramp includes at least two guiding parts individually formed for each suspension arm and made of a polymeric material having a small friction coefficient for guiding the suspension arm by sliding into a accommodation zone, and a guide supporting member made of a material having a thermal expansion coefficient smaller than that of the polymeric material of the guiding part for supporting each guiding part at a predetermined position. The guide supporting member has guide support holes which are located in zones to be contacted with the associated guiding parts, are not contacted with associated recording disks, and are engaged with the associated guiding parts at such positions that distances to the front end edges of the guiding parts become shortest. Each of the guiding parts has a projection.
    Type: Grant
    Filed: October 10, 2001
    Date of Patent: February 10, 2004
    Assignees: International Business Machines Corporation, Nok Corporation
    Inventors: Ichiroh Koyanagi, Yuhji Kobayashi, Tsai-Wei Wu, Tetsuo Ishikawa
  • Ramp for use in information recording disk apparatus, and information recording disk apparatus
    Publication number: 20020044386
    Abstract: A ramp wherein the amount of deformation in the front end edges of guiding parts caused by thermal expansion. The ramp includes at least two guiding parts individually formed for each suspension arm and made of a polymeric material having a small friction coefficient for guiding the suspension arm by sliding into a accommodation zone, and a guide supporting member made of a material having a thermal expansion coefficient smaller than that of the polymeric material of the guiding part for supporting each guiding part at a predetermined position. The guide supporting member has guide support holes which are located in zones to be contacted with the associated guiding parts, are not contacted with associated recording disks, and are engaged with the associated guiding parts at such positions that distances to the front end edges of the guiding parts become shortest. Each of the guiding parts has a projection.
    Type: Application
    Filed: October 10, 2001
    Publication date: April 18, 2002
    Applicant: International Business Machines Corporation
    Inventors: Ichiroh Koyanagi, Yuhji Kobayashi, Tsai-Wei Wu, Tetsuo Ishikawa
  • Disk drive device with shock resistance flexure and ramp limited system
    Patent number: 6067209
    Abstract: The present invention prevents a head/slider assembly fixed on a flexure of a head suspension assembly from having an undesired pitching motion when an unexpected excess shock is applied to a hard disk device when the head suspension is at the best position of the unload ramp.
    Type: Grant
    Filed: June 17, 1998
    Date of Patent: May 23, 2000
    Assignee: International Business Machines Corporation
    Inventors: Akihiko Aoyagi, David W. Albrecht, Kohji Serizawa, Yuhji Kobayashi, Hiroo Inoue