Patents by Inventor Roger F. Malmhall

Roger F. Malmhall 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).

  • Near-field hybrid magnetic-optical head system
    Patent number: 6807131
    Abstract: A hybrid magnetic-optical head apparatus wherein one or more solid state lasers, magnetic field biasing elements, magnetic sensing elements, and an aerodynamically shaped slider comprise a single integrated, monolithic device fabricated from the same base semiconductor material into an optical head. The monolithic optical head can be quickly and easily attached to the read arm of an optical read/write device without requiring attachment of separate laser and magnetic elements, and without micropositioning or use of optical microscopy for positioning the lasers or magnetic elements. The hybrid magnetic-optical head apparatus includes a magnetic-optical function region having a semiconductor laser and at least one magnetic element. Preferably, the magnetic-optical function region of the substrate includes a magnetic field biasing element associated with the semiconductor laser, as well as a magnetic sensing element.
    Type: Grant
    Filed: December 27, 2000
    Date of Patent: October 19, 2004
    Assignee: Research Investment Network, Inc.
    Inventors: Lambertus Hesselink, Douglas G. Stinson, Robert L. Thornton, Roger F. Malmhäll
  • NEAR-FIELD HYBRID MAGNETIC-OPTICAL HEAD SYSTEM
    Publication number: 20040202054
    Abstract: A hybrid magnetic-optical head apparatus wherein one or more solid state lasers, magnetic field biasing elements, magnetic sensing elements, and an aerodynamically shaped slider comprise a single integrated, monolithic device fabricated from the same base semiconductor material into an optical head. The monolithic optical head can be quickly and easily attached to the read arm of an optical read/write device without requiring attachment of separate laser and magnetic elements, and without micropositioning or use of optical microscopy for positioning the lasers or magnetic elements. The hybrid magnetic-optical head apparatus includes a magnetic-optical function region having a semiconductor laser and at least one magnetic element. Preferably, the magnetic-optical function region of the substrate includes a magnetic field biasing element associated with the semiconductor laser, as well as a magnetic sensing element.
    Type: Application
    Filed: December 27, 2000
    Publication date: October 14, 2004
    Inventors: Lambertus Hesselink, Douglas G. Stinson, Robert L. Thornton, Roger F. Malmhall