Calibration method for workpiece laser processing apparatus e.g. for cutting or for processing printing plates by comparing position of markings with reference position when deflection unit is set stationary at reference location

摘要

The method involves placing a workpiece in the deflection region of a laser beam deflection unit. A number of markings are applied to the workpiece using the beam from one or more lasers. For each marking, the deflection unit is set to be stationary at a certain reference location. The actual location of the markings are determined and compared with the reference location to derive a correction value, which is supplied to a control unit which controls the intensity and/or the deflection of the laser beam across the deflection region.