Patent 7198419 was granted and assigned to Samsung on April, 2007 by the United States Patent and Trademark Office.
A method and an apparatus for forming an image on a medium having first and second surfaces wherein an image is formed on the first surface of the medium using a printing unit. After the image formation on the first surface of the medium is completed, the medium is returned to the printing start location, and a location change unit is used to move the printing unit from a first position to a second position facing a second surface of the medium, then an image is formed on the second surface of the medium using the printing unit.