Patent ID: 7910416

Claim:
A method for manufacturing a semiconductor device comprising: forming a semiconductor film over a substrate; generating a laser beam from a laser oscillator; arranging a pair of integrally formed cylindrical array lenses so that a distance between principal points of the integrally formed cylindrical array lenses is kept within a range of 1.1f to 1.9f, where f is a focal length of the integrally formed cylindrical array lens; partitioning the laser beam by the pair of integrally formed cylindrical array lenses; condensing the partitioned laser beams through doublet cylindrical lens; and forming a linear laser beam on a surface of the semiconductor film by joining the partitioned laser beams, wherein the laser beam is partitioned by the pair of integrally formed cylindrical array lenses in a width direction of the linear laser beam which is perpendicular to a direction in which the laser beam is propagating, and wherein each of the integrally formed cylindrical array lenses does not have boundary lines between adjacent cylindrical lenses.