Patent ID: 7696449

Claim:
A silicon crystallizing device comprising: a laser beam source emitting a laser beam; a projector unit converging and changing a pattern of the laser beam from the laser beam source; a stage loading or unloading a substrate; a laser beam shutter deflecting the laser beam from the projector unit to cut off travel of the laser beam toward the stage from the projector unit during a period between a time of starting introduction of the substrate into the stage and a time of starting crystallization of the substrate, or during a period between a time of completing the crystallization of the substrate and a time of starting introduction of a next substrate into the stage; and a cooling device receiving the laser beam deflected by the laser beam shutter and sinking heat generated from the laser beam; wherein the projector unit includes: a converging lens converging the laser beam emitted from the laser beam source, a laser beam pattern mask passing the laser beam converged through the converging lens in a pattern, and a projection lens reducing the laser beam passed through the laser beam pattern mask at a ration; wherein the projection lens is warmed up by application of the laser beam to the projection lens up to a temperature at which the projection lens performs regular crystallization during the substrate loading time period defined as a time period starting from introduction of a substrate into the stage to a time right before crystallization of the substrate.