Patents by Inventor Martinus L. J. M. Van De Ven

Martinus L. J. M. Van De Ven 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).

  • Rotary magnetic head device for a magnetic recording and reproducing apparatus
    Patent number: 6222705
    Abstract: A rotary magnetic head device for a helical scanning magnetic recording and reproducing apparatus includes a rotary drum, a thin-film magnetic head (6) protruding from the rotary drum in a diametrical direction for coming into contact with a magnetic tape (7), obliquely wound around part of the outer peripheral surface of the rotary drum, and head control circuit for adjusting the protrusion of the magnetic head (6) in the diametrical direction. The head control circuit includes a feed-forward control arrangement (9) to bring and hold the magnetic head into a protruded position in which the magnetic head exerts a constant normal force on a tape (7) wound around the drum.
    Type: Grant
    Filed: March 15, 1999
    Date of Patent: April 24, 2001
    Assignee: U.S. Philips Corporation
    Inventors: Steven E. Stupp, Kofi A. A. Makinwa, Martinus L. J. M. Van De Ven