Patents by Inventor Ryuichirou Arai

Ryuichirou Arai 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).

  • Information recording method for overwriting a magneto-optic recording medium with two intensities of light beams
    Patent number: 5309415
    Abstract: Methods and apparatuses are disclosed for improving accuracy of recording and reproducing information onto and from a magneto-optic recording information medium. In the first method, a width of a mark formed by a relatively low intensity light beam between two kinds of light beam intensities used for recording information is made larger than a sum of a track land width and the maximum track offset of the light beam, thereby the mark formed by the relatively low intensity light beam covers the track land portion in its full width. In the first apparatus, a reflected light beam from the magneto-optic recording information medium is split into a reflected beam for information reproducing and a reflected beam for tracking and focusing servos at the reproducing, thereby the apparatus can remove part being affected by the track groove portion from the reflected light beam for information reproducing.
    Type: Grant
    Filed: July 24, 1991
    Date of Patent: May 3, 1994
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Koichi Takeuchi, Osamu Ito, Kyosuke Yoshimoto, Kunimaro Tanaka, Isao Watanabe, Kazuhiko Tsutsumi, Ryuichirou Arai, Yoshihiro Kiyose, Kazuhiko Nakane, Teruo Furukawa, Masayoshi Shimamoto, Yoshiyuki Nakai