Patent ID: 7968821
Filing Date: 2011-06-28
Classification: B23K

Abstract:
1. A laser 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 feed means for moving the chuck table and the laser beam application means relative to each other, wherein the laser beam application means comprises a laser beam oscillation means for oscillating a laser beam and a condenser for converging the laser beam oscillated by the laser beam oscillation means; wherein the condenser comprises a condenser lens opposed to the workpiece held on the chuck table, a first cylindrical lens unit comprising a first cylindrical lens which is convex, a second cylindrical lens unit comprising a second cylindrical lens which is concave, and an interval adjustment mechanism that moves the second cylindrical lens for adjusting the interval between the first cylindrical lens and the second cylindrical lens, wherein the first cylindrical lens and the second cylindrical lens are arranged upstream, in the laser beam application direction, of the condenser lens with the first cylindrical lens arranged between the condenser lens and the second cylindrical lens so that the first cylindrical lens and the second cylindrical lens converge or diverge the laser beam in a processing feed direction, wherein the first cylindrical lens unit is provided with a first lens holding member for holding the first cylindrical lens, a first frame having a circular hollow where the first lens holding member is fitted to be rotatable along the inner peripheral portion thereof, and a second frame in which the first frame is arranged to be movable in the processing feed direction with first moving adjustment means, and wherein the second cylindrical lens unit is provided with a second lens holding member for holding the second cylindrical lens, a first frame having a circular hollow where the second lens holding member is fitted to be rotatable along the inner peripheral portion thereof, and a second frame in which the first frame is arranged to be movable in the processing feed direction with second moving adjustment means.