Patents by Inventor Chuma Akira

Chuma Akira 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).

  • Disc drive having 3.5 inch form factor housing and 2.5 inch form factor disk media
    Patent number: 6490123
    Abstract: A magnetic disk drive has a housing for a 3.5 inch form factor and disk media of a diameter for a 2.5 inch form factor. The smaller disk media rotate at a high speed while consuming low electric lower and generating less heat while providing for quick access speeds. Usually, when the magnetic disk media are rotated at a higher speed, the electric power consumption and heat generation are increased because of the load increase. This problem is avoided with the use of cooling fins placed about the periphery of the disk media. Further, the smaller size disk media enable a decrease in torque loss during on-load rotation with the media, and a decrease of electric current to the spindle motor during rotation.
    Type: Grant
    Filed: November 5, 1998
    Date of Patent: December 3, 2002
    Assignee: Hitachi, Ltd.
    Inventors: Nobuyuki Okunaga, Masao Iwakura, Kazuo Nakagoshi, Takuji Ogawa, Chuma Akira, Fumio Kugiya, Tomio Suzuki, Toshiaki Kojima, Kazuo Sakai, Naoki Kodama, Tatsuya Ishigaki
  • Magnetic disk drive and magnetic disk drive system
    Publication number: 20020093758
    Abstract: A magnetic disk drive that shape coefficient is 3.5 inches are provided, which is designed as rotating magnetic media in a high speed in order to consume a low electric power, to generate a less heat, and to access more quickly.
    Type: Application
    Filed: March 8, 2002
    Publication date: July 18, 2002
    Applicant: Hitachi, Ltd.
    Inventors: Nobuyuki Okunaga, Masao Iwakura, Kazuo Nakagoshi, Takuji Ogawa, Chuma Akira, Fumio Kugiya, Tomio Suzuki, Toshiaki Kojima, Kazuo Sakai, Naoki Kodama, Tatsuya Ishigaki
  • Magnetic disk drive and magnetic disk drive system
    Publication number: 20020093760
    Abstract: A magnetic disk drive that shape coefficient is 3.5 inches are provided, which is designed as rotating magnetic media in a high speed in order to consume a low electric power, to generate a less heat, and to access more quickly.
    Type: Application
    Filed: March 8, 2002
    Publication date: July 18, 2002
    Applicant: Hitachi, Ltd.
    Inventors: Nobuyuki Okunaga, Masao Iwakura, Kazuo Nakagoshi, Takuji Ogawa, Chuma Akira, Fumio Kugiya, Tomio Suzuki, Toshiaki Kojima, Kazuo Sakai, Naoki Kodama, Tatsuya Ishigaki
  • Magnetic disk drive and magnetic disk drive system
    Publication number: 20020093759
    Abstract: A magnetic disk drive that shape coefficient is 3.5 inches are provided, which is designed as rotating magnetic media in a high speed in order to consume a low electric power, to generate a less heat, and to access more quickly.
    Type: Application
    Filed: March 8, 2002
    Publication date: July 18, 2002
    Applicant: Hitachi, Ltd.
    Inventors: Nobuyuki Okunaga, Masao Iwakura, Kazuo Nakagoshi, Takuji Ogawa, Chuma Akira, Fumio Kugiya, Tomio Suzuki, Toshiaki Kojima, Kazuo Sakai, Naoki Kodama, Tatsuya Ishigaki