Patents Assigned to Dragsholm Wireless Holdings LLC
  • Method and apparatus for writing on an optical disk with beam spots aligned at an angle to data tracks
    Patent number: 7403465
    Abstract: Data is written on a plurality of data tracks on an optical disk by a plurality of laser beams. The spots illuminated by the beams are spaced apart to prevent thermal interference. The spots are aligned along a line at an angle to the tangent of the data tracks. The angle of the line of spots is determined by an equation using variables that include the track pitch, the minimum distance between spots and the difference in track numbers between tracks being written.
    Type: Grant
    Filed: October 14, 2005
    Date of Patent: July 22, 2008
    Assignee: Dragsholm Wireless Holdings LLC
    Inventors: Steven R. Rogers, Alexander Libinson
  • Method and apparatus for writing on an optical disk with beam spots aligned at an angle to data tracks
    Publication number: 20060044964
    Abstract: Data is written on a plurality of data tracks on an optical disk by a plurality of laser beams. The spots illuminated by the beams are spaced apart to prevent thermal interference. The spots are aligned along a line at an angle to the tangent of the data tracks. The angle of the line of spots is determined by an equation using variables that include the track pitch, the minimum distance between spots and the difference in track numbers between tracks being written.
    Type: Application
    Filed: October 14, 2005
    Publication date: March 2, 2006
    Applicant: Dragsholm Wireless Holdings LLC
    Inventors: Steven Rogers, Alexander Libinson
  • Method and apparatus for writing on an optical disk with beam spots aligned at an angle to data tracks
    Patent number: 6985414
    Abstract: Data is written on a plurality of data tracks on an optical disk by a plurality of laser beams. The spots illuminated by the beams are spaced apart to prevent thermal interference. The spots are aligned along a line at an angle to the tangent of the data tracks. The angle of the line of spots is determined by an equation using variables that include the track pitch, the minimum distance between spots and the difference in track numbers between tracks being written.
    Type: Grant
    Filed: January 8, 2002
    Date of Patent: January 10, 2006
    Assignee: Dragsholm Wireless Holdings LLC
    Inventors: Steven R. Rogers, Alexander Libinson
  • Methods and apparatus for cross-talk and jitter reduction in multi-beam optical disks
    Patent number: 6940805
    Abstract: Methods and apparatus are provided for reducing cross-talk and jitter caused by track offsets in multi-beam optical disks. The method and apparatus involve using split detectors and cross-talk cancellation algorithms in the multi-element photodetector of the multi-beam optical disks. The cross-talk cancellation algorithms are applied according to the value of the track offset as a function of the track pitch.
    Type: Grant
    Filed: October 23, 2001
    Date of Patent: September 6, 2005
    Assignee: Dragsholm Wireless Holdings LLC
    Inventors: Koby Finkelstein, Steven R. Rogers, Tatiana Tania Kosoburd, Joseph Kedmi