Patents by Inventor Daisuke Shikuma

Daisuke Shikuma 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).

  • Magnetic recording apparatus
    Patent number: 7057839
    Abstract: A magnetic recording apparatus has a head for recording information on a magnetic recording medium, a write current setting circuit for controlling a write current that is passed through the head, a fault detection circuit for detecting a fault in the head based on the result of comparison between head voltages appearing at both ends of the head and a reference voltage, and a reference voltage setting circuit for varying the reference voltage according to the write current. This configuration permits correct detection of faults in the head all the time irrespective of the write current or the supply voltage.
    Type: Grant
    Filed: March 25, 2003
    Date of Patent: June 6, 2006
    Assignee: Rohm Co., Ltd.
    Inventors: Daisuke Shikuma, Kunihiro Komiya
  • Magnetic recording apparatus
    Publication number: 20030142433
    Abstract: A magnetic recording apparatus has a head for recording information on a magnetic recording medium, a write current setting circuit for controlling a write current that is passed through the head, a fault detection circuit for detecting a fault in the head based on the result of comparison between head voltages appearing at both ends of the head and a reference voltage, and a reference voltage setting circuit for varying the reference voltage according to the write current. This configuration permits correct detection of faults in the head all the time irrespective of the write current or the supply voltage.
    Type: Application
    Filed: March 25, 2003
    Publication date: July 31, 2003
    Inventors: Daisuke Shikuma, Kunihiro Komiya