Patent ID: 7160765

Claim:
A method for manufacturing a semiconductor device comprising the steps of: forming a semiconductor film over a substrate; generating a laser beam from a laser oscillator; partitioning the laser beam by a pair of integrally formed cylindrical array lenses; 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 the direction in which the laser beam is moving, wherein the integrally formed cylindrical array lenses are a first integrally formed cylindrical array lens and a second integrally formed cylindrical array lens, wherein the laser beam enters from a side of a convex surface to pass through the first integrally formed cylindrical array lens, and wherein partitioned laser beams enter from a side of a flat surface to pass through the second integrally formed cylindrical array lens.