Patent ID: 7105048
Filing Date: 2006-09-12
Classification: B23K,H01L,Y10T

Abstract:
1. A laser irradiation apparatus comprising: a plurality of laser oscillation apparatuses; an optical system that condenses a plurality of laser lights outputted from the plurality of laser oscillation apparatuses and partially overlaps beam spots with each other at a substrate; a slit that limits a width of a beam spot obtained by the overlapping in a direction perpendicular to a moving direction of the substrate; a position control means for controlling a position of the substrate; and a computer that specifies, from pattern information concerning an element group to be formed over the substrate, a region that will become an active layer of the element group with reference to a marker, that determines a specific region of a semiconductor film to be irradiated with the laser lights so that the region that will become the active layer is included in the specific region, that synchronizes the slit, the plurality of laser oscillation apparatuses, and the position control means, and that superimposes the beam spot, whose width has been limited by the slit, on the specific region.