| 摘要 |
<p>The present invention provides a laser engraver for engraving a pattern on a workpiece. The pattern is established on the workpiece by using a X-Y assembly(32a,32b) to move a laser beam in two dimensions relative to the workpiece. The X-Y assembly employs a X proportional-integral-differential (PID) controller (34a) and a PID (34b) to generate control signals for moving the X-Y assembly. The PIDs generate the control signal based upon the current position of the laser beam and a target position for the laser beam. The current position is provided by encoders (36a,36b) operatively attached to motors (38a,38b) that, in turn, move mirrors (44a,44b) that direct the laser beam to the workpiece. The depth of cut is, preferably, controlled by using the integral of the difference between the position of the laser beam as it is moved by the X-Y assembly and a reference position. Alternatively, proportional control based upon the absolute difference between the position of the laser as it is moved by the X-Y assembly and the reference position can be utilized. <IMAGE></p> |
