Patents by Inventor Tetsuya Makiura

Tetsuya Makiura 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).

  • Patent number: 6452737
    Abstract: In a magnetic disk device, a deterioration of performance caused by an environmental variation is suppressed by utilizing an automatic adaptation function in a read/write channel IC. A gate provides a timing for the automatic adaptation of an equalization coefficient, a signal from the gate is given to a read-gate input terminal of the read/write channel IC, and the gate for the automatic adaptation is opened before reading data from a destination sector to be read. The automatic adaptation is started, whereby coefficients for equalization are adapted to signal wave forms before reading data.
    Type: Grant
    Filed: February 23, 2001
    Date of Patent: September 17, 2002
    Assignee: Hitachi, Ltd.
    Inventors: Tetsuya Makiura, Reijiro Tsuchiya
  • Patent number: 6285520
    Abstract: In a magnetic disk device, a deterioration of performance caused by an environmental variation is suppressed by utilizing an automatic adaptation function in a read/write channel IC. A gate provides a timing for the automatic adaptation of an equalization coefficient, a signal from the gate is given to a read-gate input terminal of the read/write channel IC, and the gate for the automatic adaptation is opened before reading data from a destination sector to be read. The automatic adaptation is started, whereby coefficients for equalization are adapted to signal wave forms before reading data.
    Type: Grant
    Filed: May 25, 1999
    Date of Patent: September 4, 2001
    Assignee: Hitachi, Ltd.
    Inventors: Tetsuya Makiura, Reijiro Tsuchiya
  • Publication number: 20010013986
    Abstract: In conventional technologies, when an automatic adaptation function of coefficient for equalization in a read/write channel IC is used, equalization coefficients obtained assuming a certain environment are used as initial values at the beginning of data reading. Therefore, if an environment in which the device operates actually differs seriously from the assumed environment, there is possibility that read errors are caused by inadequate coefficients for equalization at the beginning of data reading.
    Type: Application
    Filed: February 23, 2001
    Publication date: August 16, 2001
    Inventors: Tetsuya Makiura, Reijiro Tsuchiya