Patent ID: 8404998
Filing Date: 2013-03-26
Classification: B23K

Abstract:
1. A method for dithering a laser beam to process features in a workpiece, the method comprising: imparting, using a first positioning system, first relative movement of a laser beam spot position along a processing trajectory; imparting, using a second positioning system, second relative movement of the laser beam spot position along a dither direction relative to the processing trajectory, wherein the second relative movement is superimposed on the first relative movement, and wherein the second relative movement is at a substantially higher velocity than that of the first relative movement; amplitude modulating, using the second positioning system, a laser beam based on a specific feature characteristic at one or more corresponding target locations on the workpiece, wherein the specific feature characteristic comprises a selected shape of a cross-section of a portion of a trench cut in a direction of the processing trajectory along a surface of the workpiece by the laser beam; and emitting the laser beam to the workpiece during the second relative movement to effectively widen a laser beam spot at the workpiece in the dither direction.