Patent ID: 7482554

Claim:
A laser beam processing machine comprising a chuck table for holding a workpiece, a laser beam application means for applying a laser beam to the workpiece held on the chuck table, and a processing-feed means for moving the chuck table and the laser beam application means relative to each other, the laser beam application means including a laser beam oscillation means and a condenser for converging a laser beam oscillated from the laser beam oscillation means and applying the converged laser beam, wherein the condenser comprises a first prism for dividing the laser beam oscillated from the laser beam oscillation means into a first laser beam and a second laser beam both having a semicircular section and interchanging the first laser beam and the second laser beam, a second prism for correcting the optical paths of the first laser beam and the second laser beam formed by the first prism to become parallel to each other, and an image forming lens for forming the first laser beam and the second laser beam whose optical paths have been corrected to be parallel to each other by the second prism, into images of spots having linear portions on the outer sides and arcuate portions on the inner sides.