Patent ID: 7660042

Claim:
An apparatus for crystallizing a semiconductor, comprising: at least one laser source; beam dividing means for dividing a laser beam emitted by the laser source into a plurality of sub-beams; at least one focussing optical system for focussing the sub-beams on an amorphous semiconductor on a substrate; a moving mechanism for changing a distance between at least two spot positions of the sub-beams formed by the focussing optical system; first mirrors for directing the sub-beams to the focussing optical system; and second mirrors provided in the focussing optical system to receive the sub- beams reflected by the first mirrors, wherein the sub-beams between the first mirrors and the second mirrors are parallel to a direction of movement of the moving mechanism, and wherein said focussing optical system includes a frame and a plurality of movable focussing units secured by said frame, and said moving mechanism includes moving members associated with the focussing units for moving said focussing units relative to said frame, wherein said focussing units are arranged parallel to each other in a plane and movable to change the distance between sub-beams formed by the adjacent two focussing units, wherein each of the focussing units includes a case, a mirror and lenses secured by said case.