Patents by Inventor Hideki Mochiduki

Hideki Mochiduki 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).

  • Defect detector circuit with a signal synthesizer and magnet disk certifier using the same defect detector circuit
    Patent number: 6552535
    Abstract: A magnetic disk certifier includes a defect detector circuit comprising a low-pass filter for extracting a low frequency component of the read-out signal, the low frequency component containing a signal component of the error, a signal generator circuit for generating a signal having a predetermined frequency lower than the frequency of the read-out signal, a synthesizer circuit for synthesizing an output signal of the low-pass filter and the signal outputted from the signal generator circuit and a comparator for generating an error signal by comparing the synthesized signal from the synthesizer circuit with a predetermined reference level.
    Type: Grant
    Filed: September 26, 2001
    Date of Patent: April 22, 2003
    Assignee: Hitachi Electronics Engineering Co., Ltd.
    Inventors: Toshiharu Funaki, Shinji Honma, Kenichi Shitara, Hideki Mochiduki
  • Defect detector circuit and magnetic disk certifier using the same defect detector circuit
    Publication number: 20020041184
    Abstract: A magnetic disk certifier includes a defect detector circuit comprising a low-pass filter for extracting a low frequency component of the read-out signal, the low frequency component containing a signal component of the error, a signal generator circuit for generating a signal having a predetermined frequency lower than the frequency of the read-out signal, a synthesizer circuit for synthesizing an output signal of the low-pass filter and the signal outputted from the signal generator circuit and a comparator for generating an error signal by comparing the synthesized signal from the synthesizer circuit with a predetermined reference level.
    Type: Application
    Filed: September 26, 2001
    Publication date: April 11, 2002
    Inventors: Toshiharu Funaki, Shinji Honma, Kenichi Shitara, Hideki Mochiduki