Patent ID: 9718146
Date: 2017-08-01
CPC Classifications: B23K,G01B,G01J,G03F,H01S

Claim:
1. A method for calibrating a laser processing machine, the laser processing machine including a processor in communication with a memory, the method comprising: obtaining a set of stored desired calibration positions on a work surface of the laser processing machine from the memory; directing a scan head to position a laser beam to a desired calibration position from the set of desired calibration positions on the work surface, wherein the work surface is configured to receive a work piece; aligning the laser beam of the scan head with a working area of a light sensor, wherein the light sensor is located on the work surface during calibration; measuring indirectly by at least one position feedback device, along electromechanical paths of at least one actuator of the laser processing machine, an initial actual position of the laser beam; using a servo loop configured to control positions of the at least one actuator using measured position signals of the light sensor via the processor, wherein the light sensor measures a position of the laser beam relative to a center of the working area of the light sensor, such that the servo loop causes the at least one actuator to alter a position of the laser beam to a center of the working area of the light sensor; measuring indirectly by the at least one position feedback device, along electromechanical paths of at least one actuator of the laser processing machine, a final actual position of the laser beam after the servo loop centers the laser beam on the center of the working area of the light sensor; determining, the difference between the initial actual position and the final actual position for the desired calibration position; continuing to determine, the difference between each initial actual position and each final actual position for each desired calibration position, for the remaining desired calibration positions from the set of desired calibration positions, so that each desired calibration position from the set of desired calibration positions is processed; and determining, based on elements that include the determined differences for the set of desired calibration positions compensation coefficients to calibrate the laser processing machine.