Patents by Inventor Nobutoshi Mizasawa

Nobutoshi Mizasawa 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).

  • Tracking error signal detecting apparatus using an electron beam and apparatus for effecting recording/reproduction of information by the utilization of a plurality of electron beams
    Patent number: 5270990
    Abstract: A tracking error signal detecting apparatus includes a device for supplying an electron beam, a device for applying the electron beam to a tracking pattern formed on a recording medium, and a device for forming a tracking error signal on the basis of a signal produced from the tracking pattern upon application of the electron beam. An information recording-reproducing apparatus includes an applying device having a plurality of electron ray sources, a device for controlling the driving of the plurality of electron ray sources in response to a signal, a device for directing the electron rays from the electron ray sources to a recording medium, and a device for reproducing information from signals produced upon application of the electron rays to the recording medium.
    Type: Grant
    Filed: November 6, 1992
    Date of Patent: December 14, 1993
    Assignee: Canon Kabushiki Kaisha
    Inventors: Nobutoshi Mizasawa, Takahiko Ishiwatari, Ryuichi Arai, Mamoru Miyawaki, Yukio Masuda, Hitoshi Oda