Patent ID: 8513566
Filing Date: 2013-08-20
Classification: B23K

Abstract:
1. 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, a processing-feed means for moving the chuck table and the laser beam application means relative to each other in a processing-feed direction, and a controller, the laser beam application means comprising: a shared pulse laser beam oscillation means acting as a first pulse laser beam oscillation means and a second pulse laser beam oscillation means, an acousto-optic deflection means for deflecting the optical axis of a first pulse laser beam oscillated by the first oscillation means in the processing-feed direction, a first condenser lens for converging the first pulse laser beam passing through the acousto-optic deflection mean, a second condenser lens for converging a second pulse laser beam oscillated by the second oscillation means, and a route switching means that selectively switches a pulse laser beam oscillated from the shared pulse laser beam oscillation means between a first optical route including the first oscillation means, the acousto-optic deflection means, and the first condenser lens, and a second optical route including the second oscillation means and the second condenser lens, wherein the acousto-optic deflection means is installed in the first optical route and is not installed in the second optical route, the controller controls the processing machine so that the first pulse laser beam in the first optical route cuts an incomplete via hole leaving a remaining portion of the workpiece, and the second pulse laser beam in the second optical route eliminates the remaining portion to complete the via hole, and a focal distance of the second pulse laser beam as converged through the second condenser lens is less than the focal distance of the first pulse laser beam as converged through the first condenser lens so as to reduce a processable length of the laser beam to the workpiece per pulse.