Patents by Inventor Ryuuji Kudoh

Ryuuji Kudoh 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 operational circuit for a multi-beam pick-up device
    Patent number: 6353583
    Abstract: The present invention provides a large scale integrated circuit (LSI) for calculating servo signals (e.g., a focusing signal, a tracking signal, etc.) from the output signals received from a plurality of photo detectors, as used within an optical disk apparatus. The invention provides a switching circuit and a gain changing circuit coupled to the LSI such that a single LSI may be used for at least two different photo detector configurations as may be found in at least two different pick-up devices.
    Type: Grant
    Filed: March 1, 1999
    Date of Patent: March 5, 2002
    Assignee: Ricoh Company, Ltd.
    Inventors: Ryuuji Kudoh, Tatsuaki Sakurai, Masaaki Sofue