Patent ID: 8198609

Claim:
An apparatus for forming a nano pattern comprising: a laser to generate a beam; a beam splitter to split the beam from the laser into two beams having the same intensity; variable mirrors to reflect the two beams split by the beam splitter to a substrate; beam expansion units to expand the diameters of the two beams, respectively positioned on paths of the two beams traveling toward the substrate; a beam blocking unit, installed on an upper part of the substrate, to transmit only a specific region of the expanded beam through the beam expansion unit and to block a remaining region to form a uniform pattern; and a substrate transfer device to transfer the substrate vertically and horizontally, to allow the entire surface of the substrate to be irradiated, installed on a lower part of the substrate, wherein the beam blocking unit only transmits a central part of the expanded beams, the central part of the beams having maximum intensity, wherein the substrate transfer device transfers substrate sequentially by an equal amount to each section of the uniform pattern, and the central parts of the beams are limited to being greater than half of the maximum intensity thereof.