Patents by Inventor Sonoko Onodera

Sonoko Onodera 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).

  • Phase-change optical recording medium
    Patent number: 7060338
    Abstract: A phase-change optical recording medium capable of performing recording and reproduction at a high speed is provided, in which a reproduced signal output is not only sufficiently large but the phase-change optical recording medium also has excellent repeated rewriting performance. An interface layer 3, which is composed of a Ge—Si—N-based material, is formed on at least a surface of one side of a recording layer 4 of the phase-change optical recording medium 10. Accordingly, even when a phase-change material having a high melting point, for example, a Bi—Ge—Te-based phase-change material is used for the recording layer 4, it is possible to provide the phase-change optical recording medium in which the reproduced signal output is sufficiently large and the repeated rewriting performance is excellent.
    Type: Grant
    Filed: June 24, 2004
    Date of Patent: June 13, 2006
    Assignee: Hitachi Maxell, Ltd.
    Inventors: Yoshihiro Ikari, Akira Kashiwakura, Makoto Miyamoto, Makoto Iimura, Naoki Kitagaki, Yutaka Watanabe, Mayumi Kurokawa, Sonoko Onodera
  • Phase-change optical recording medium
    Publication number: 20040264357
    Abstract: A phase-change optical recording medium capable of performing recording and reproduction at a high speed is provided, in which a reproduced signal output is not only sufficiently large but the phase-change optical recording medium also has excellent repeated rewriting performance. An interface layer 3, which is composed of a Ge—Si—N-based material, is formed on at least a surface of one side of a recording layer 4 of the phase-change optical recording medium 10. Accordingly, even when a phase-change material having a high melting point, for example, a Bi—Ge—Te-based phase-change material is used for the recording layer 4, it is possible to provide the phase-change optical recording medium in which the reproduced signal output is sufficiently large and the repeated rewriting performance is excellent.
    Type: Application
    Filed: June 24, 2004
    Publication date: December 30, 2004
    Applicant: Hitachi Maxell, Ltd.
    Inventors: Yoshihiro Ikari, Akira Kashiwakura, Makoto Miyamoto, Makoto Iimura, Naoki Kitagaki, Yutaka Watanabe, Mayumi Kurokawa, Sonoko Onodera