Patents by Inventor Shizuo Yamazaki

Shizuo Yamazaki 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).

  • Servo pattern writing method and apparatus thereof
    Patent number: 6947244
    Abstract: The center of rotation of a disk medium 1 when servo information is written thereto coincides as accurately as possible with its center of rotation in the drive into which the disk medium 1 is assembled. The magnetic disk medium 1 is fixed to a spindle hub 4. A centering pin 8a of a push-aside mechanism 9 pushes aside the magnetic disk medium 1 with respect to the center of the spindle hub 4 until the disk-to-hub gap is moved to one side. Then, with a centering pin 8b of a come-back mechanism 10 placed in the same line intersecting with the center of the spindle, the magnetic disk medium 1 is pushed back to the opposite side.
    Type: Grant
    Filed: November 27, 2002
    Date of Patent: September 20, 2005
    Assignee: Hitachi Global Storage Technologies Japan, Ltd.
    Inventors: Hiroshi Kawaguchi, Shizuo Yamazaki, Makoto Horisaki, Katsumi Watanabe, Kenji Tomida, Youichi Kusagaya
  • Method for assembling disc apparatus
    Patent number: 6839956
    Abstract: An object of the invention is to provide a method of assembling a disc which can reduce an unbalance of a rotating portion.
    Type: Grant
    Filed: August 22, 2001
    Date of Patent: January 11, 2005
    Assignee: Hitachi, Ltd.
    Inventors: Keiko Watanabe, Tetsuya Hamaguchi, Takashi Matsuki, Shizuo Yamazaki
  • Servo pattern writing method and apparatus thereof
    Publication number: 20030142436
    Abstract: The center of rotation of a disk medium 1 when servo information is written thereto coincides as accurately as possible with its center of rotation in the drive into which the disk medium 1 is assembled.
    Type: Application
    Filed: November 27, 2002
    Publication date: July 31, 2003
    Applicant: Hitachi, Ltd.
    Inventors: Hiroshi Kawaguchi, Shizuo Yamazaki, Makoto Horisaki, Katsumi Watanabe, Kenji Tomida, Youichi Kusagaya
  • Method for assembling disc apparatus
    Publication number: 20020059718
    Abstract: An object of the invention is to provide a method of assembling a disc which can reduce an unbalance of a rotating portion.
    Type: Application
    Filed: August 22, 2001
    Publication date: May 23, 2002
    Inventors: Keiko Watanabe, Tetsuya Hamaguchi, Takashi Matsuki, Shizuo Yamazaki
  • Automatic assembling system
    Patent number: 6105239
    Abstract: An automatic assembling system for assembling a product constituted by a plurality of parts, includes a group cell having a plurality of assembling cells and inspecting cells, pallets loaded with the same type of parts or products, at least one buffer for holding a plurality of pallets, and at least one pallet hand-over mechanism for transferring pallets between the buffer and each cell. At least one of the buffers is provided in common for a plurality of cells, and at least one of the pallet hand-over mechanisms is provided to the common buffer.
    Type: Grant
    Filed: November 26, 1997
    Date of Patent: August 22, 2000
    Assignee: Hitachi, Ltd.
    Inventors: Tsutomu Kuse, Shizuo Yamazaki, Hiroshi Kato, Mikio Rachi, Keisuke Yamaoka, Tomoaki Sakata
  • Automatic assembling system
    Patent number: 5737827
    Abstract: An automatic assembling system for assembling a product constituted by a plurality of parts, includes a group cell having a plurality of assembling cells and inspecting cells, pallets loaded with the same type of parts or products, at least one buffer for holding a plurality of pallets, and at least one pallet hand-over mechanism for transferring pallets between the buffer and each cell. At least one of the buffers is provided in common for a plurality of cells, and at least one of the pallet hand-over mechanisms is provided to the common buffer.
    Type: Grant
    Filed: September 6, 1995
    Date of Patent: April 14, 1998
    Assignee: Hitachi, Ltd.
    Inventors: Tsutomu Kuse, Shizuo Yamazaki, Hiroshi Kato, Mikio Rachi, Keisuke Yamaoka, Tomoaki Sakata
  • Shock-absorbing polyurethane foam and production process thereof
    Patent number: 4987156
    Abstract: A shock-absorbing polyurethane foam is formed of a polyol component and a polyisocyanate component. The polyol component is a mixed polyol having an average hydroxyl number of 130-250 and composed at least of 20-70 parts by weight of a low-molecular polyol having a molecular weight of 300-500 and 80-30 parts by weight of a high-molecular polyol having a molecular weight of 1,500-8,000 per 100 parts by weight of the whole polyol component. The foam further contains 5-150 parts by weight of a plasticizer having a solidification point not higher than -20.degree. C. per 100 parts by weight of the whole polyol component. The foam can be produced by reacting the polyol component and polyisocyanate component in the presence of 5-150 parts by weight of the plasticizer per 100 parts by weight of the polyol component.
    Type: Grant
    Filed: June 5, 1989
    Date of Patent: January 22, 1991
    Assignees: Achilles Corporation, Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Sigeru Tozune, Shizuo Yamazaki, Ryuichi Komori, Masashi Ishii, Yoshio Sakaguchi, Tetsuya Oda