Patent ID: 7932478
Filing Date: 2011-04-26
Classification: B23K

Abstract:
1. A laser processing machine comprising: a chuck table adapted to hold a workpiece thereon; and laser beam irradiation means for applying a laser beam to the workpiece held on the chuck table; wherein said laser beam irradiation means includes laser beam oscillation means for emitting a pulse laser beam, deflection means for deflecting the pulse laser beam emitted from the laser beam oscillation means; and a concentrator having ellipsoidal focusing spot forming means for focusing the pulse laser beam deflected by the deflection means and for forming a focusing spot into an ellipse; wherein: said ellipsoidal focusing spot forming means includes a first cylindrical lens composed of a concave lens; a second cylindrical lens composed of a convex lens disposed on the downstream side of the first cylindrical lens in a laser beam irradiation direction; a first turning adjustment means for turning the first cylindrical lens; a second turning adjustment means for turning the second cylindrical lens; a first movement adjusting means for moving said first cylindrical lens in a direction perpendicular to the light-focusing direction of said first cylindrical lens; a second movement adjusting means for moving said second cylindrical lens in a direction perpendicular to the light-focusing direction of said second cylindrical lens; and an interval adjusting mechanism which adjusts the interval between the first cylindrical lens and the second cylindrical lens.