Patents by Inventor Erik Hardeng

Erik Hardeng 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).

  • Patent number: 5909335
    Abstract: A speed servo control for a tape drive comprising a take up reel having tape wound therearound, the tape extending to a supply reel and wound therearound. A flutter roller is arranged to press said tape that extends between the take up reel and the supply reel to rotate with circulation of the tape. A first tachometer is connected to said take up reel to rotate therewith. A second tachometer is connected to the flutter roller to rotate therewith, the first and second tachometers connected to a servo system for controlling the speed of the take up reel drive motor according to the select speed of the tape. The second tachometer from the flutter roller normally controls the servo for controlling the take up reel speed. A mechanism is provided for ignoring a tachometer signal from the second tachometer and controlling using the first tachometer, until the tape is tensioned against the flutter roller after start up.
    Type: Grant
    Filed: January 17, 1997
    Date of Patent: June 1, 1999
    Assignee: Tandberg Data ASA
    Inventors: Erik Hardeng, Georg Boasson
  • Patent number: 5119244
    Abstract: A method and an apparatus for recording data information on a magnetic recording medium with the assistance of a magnetic write head and a controllable record amplifier preceding the magnetic write head and to which the data information in the form of binary data signals, as well as bias signals superimposed thereon are supplied, are disclosed. The recorded signals are, in turn, read with a playback device immediately after the recording. In a measuring device, the peak shift of the read output signals is measured and averaged. The amplitudes for the binary data signals and/or of the bias signals are corrected with a control signal generated by a control unit dependent on the average peak shift, being corrected in order to achieve an optimum relationship of read output signal amplitude to minimum peak shift.
    Type: Grant
    Filed: April 11, 1990
    Date of Patent: June 2, 1992
    Assignee: Tandberg Data AS
    Inventor: Erik Hardeng