Patent ID: 8379194
Filing Date: 2013-02-19
Classification: B23K

Abstract:
1. A method for focusing a laser in the laser processing of a workpiece, the method comprising the following steps: (a) adjusting the focal distance f of a laser to a starting value A; (b) resetting a continuous index i to an initial value; (c) producing a focal spot on a workpiece to be processed; (d) storing the current value of the continuous index i together with the corresponding value of the focal distance f (e) moving the workpiece by one path increment Δx along a predetermined track; (f) adjusting the focal distance f in the direction of a final value B by one infeed increment Δf; (g) incrementing the continuous index i and repeating the steps (c) to (f) until reaching one of (h) determining the focal spot with the smallest focal spot diameter d (i) determining the optimal continuous index i (j) adjusting the focus of the laser to the optimal focal distance f wherein the steps of determining the focal spot with the smallest focal spot diameter d