Patents Assigned to Tokyo Seibaura Denki Kabushiki Kaisha
  • Overlay recording prevention device for optical disc apparatus
    Patent number: 4570251
    Abstract: An overlay recording prevention device for an optical disc apparatus detects a signal corresponding to a recording pit of a recorded track. This signal is detected from a photoelectric signal of an optical head when a tracking error occurs in the recording mode and a beam spot is shifted onto an already-recorded track. A high-level recording laser beam is stopped in response to this detection signal.
    Type: Grant
    Filed: March 9, 1983
    Date of Patent: February 11, 1986
    Assignee: Tokyo Seibaura Denki Kabushiki Kaisha
    Inventors: Tsuneshi Yokota, Akira Nakagawa