Patents by Inventor Jyunko Matsui

Jyunko Matsui 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).

  • Head IC, read circuit, and media storage device
    Patent number: 7852584
    Abstract: A head IC adjusts an amplitude level of head read signals with regard to scattering in head output characteristics, so as to conform to the input dynamic range of the read channel AGC. An AGC amplifier is provided in a head IC connected to a read channel, and the feedback response speed of the AGC circuit of the head IC is set to be substantially slower than the feedback response speed of the AGC circuit of the read channel. Within the head IC, the amplitude of signals from the head is automatically adjusted, enabling adjustment of the input signal level to the input dynamic range of the AGC amplifier of the read channel. The AGC circuit of the head IC has no effect on the faster AGC operation of the AGC circuit of the read channel.
    Type: Grant
    Filed: December 21, 2007
    Date of Patent: December 14, 2010
    Assignee: Toshiba Storage Device Corporation
    Inventors: Jyunko Matsui, Yasuhiko Takahashi
  • Head IC, read circuit, and media storage device
    Publication number: 20080100944
    Abstract: A head IC adjusts an amplitude level of head read signals with regard to scattering in head output characteristics, so as to conform to the input dynamic range of the read channel AGC. An AGC amplifier is provided in a head IC connected to a read channel, and the feedback response speed of the AGC circuit of the head IC is set to be substantially slower than the feedback response speed of the AGC circuit of the read channel. Within the head IC, the amplitude of signals from the head is automatically adjusted, enabling adjustment of the input signal level to the input dynamic range of the AGC amplifier of the read channel. The AGC circuit of the head IC has no effect on the faster AGC operation of the AGC circuit of the read channel.
    Type: Application
    Filed: December 21, 2007
    Publication date: May 1, 2008
    Applicant: Fujitsu Limited
    Inventors: Jyunko Matsui, Yasuhiko Takahashi