Patents by Inventor Hubertus M. M. Lonij

Hubertus M. M. Lonij 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).

  • Smooth lock-in of servo control when switched on
    Patent number: 4683561
    Abstract: An apparatus for playing optical discs is described, in which for a smoother locking-in of the focus servo control the focussing error signal is initially derived from the amplitude of the h.f. signal, followed by a gradual change-over to a difference signal derived by means of subdetectors. In this way the focus control point with the servo loop closed is shifted towards the desired in-focus point.
    Type: Grant
    Filed: September 10, 1985
    Date of Patent: July 28, 1987
    Assignee: U.S. Philips Corporation
    Inventors: Martinus P. M. Bierhoff, Hubertus M. M. Lonij