Patents by Inventor Ayumu Ibusuki

Ayumu Ibusuki 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).

  • Signal generating circuit and optical pickup device provided therewith
    Patent number: 7406018
    Abstract: A signal generating circuit of the invention includes a current polarity switch circuit that receives an output current of a light-sensitive element and outputs a current of which the direction the polarity switch circuit keeps constant regardless of the direction of the received current, a current-to-voltage conversion circuit that converts the current outputted from the current polarity switch circuit into a voltage, and a signal processing circuit that receives the voltage outputted from the current-voltage conversion circuit to generate a signal based on the received voltage. Thus, the signal based on the received current signal can be generated regardless of the direction of the received current signal.
    Type: Grant
    Filed: February 22, 2005
    Date of Patent: July 29, 2008
    Assignee: Rohm Co., Ltd.
    Inventors: Ayumu Ibusuki, Hiroyuki Funahashi, Koji Nishikawa
  • Signal generating circuit and optical pickup device provided therewith
    Publication number: 20050185525
    Abstract: A signal generating circuit of the invention includes a current polarity switch circuit that receives an output current of a light-sensitive element and outputs a current of which the direction the polarity switch circuit keeps constant regardless of the direction of the received current, a current-to-voltage conversion circuit that converts the current outputted from the current polarity switch circuit into a voltage, and a signal processing circuit that receives the voltage outputted from the current-voltage conversion circuit to generate a signal based on the received voltage. Thus, the signal based on the received current signal can be generated regardless of the direction of the received current signal.
    Type: Application
    Filed: February 22, 2005
    Publication date: August 25, 2005
    Inventors: Ayumu Ibusuki, Hiroyuki Funahashi, Koji Nishikawa