Patent ID: 6615099
Filing Date: 2003-09-02
Classification: B23K

Abstract:
A method for calibrating a laser processing machine for processing workpieces, comprising:positioning a calibration plate in front of an objective; recording an image of the calibration plate, which is generated by the objective and a deflection unit, by moving the objective and a field of view of a camera over the calibration plate under control of the deflection unit; determining imaging errors caused by the deflection unit and by the objective from said image in a control unit, the control unit being connected downstream of the camera; storing said imaging errors; positioning a test plate in front of the objective; writing a test pattern onto the test plate by a laser beam from a laser source with a predetermined drive of the deflection unit; measuring a position of the test pattern; determining an optical offset of the laser source based on a measured position of the test pattern taking said imaging errors into account; storing the optical offset; and compensating for the stored optical offset and the stored imaging errors during the processing of workpieces.