Method for correcting a control of an optical scanner and the optical scanner

Method for correcting a control of an optical scanner (14), having a beam deflecting element (31) for deflection of a beam of optical radiation and a drive unit (30, 30′, 35) for moving the beam deflecting element (31), comprising the steps of:

• determining a current value of a drive unit transfer function for at least one predetermined frequency, said drive unit transfer function reflecting the response of the drive unit (30, 30′, 35) to control signals determined from a predetermined target movement or a change in a target movement of the focus of the beam;
• correcting as a function of the current value of the drive unit transfer function, at least one of:
• at least one parameter for control or regulation of a predetermined target movement of the focus of the beam and
• a transfer function of a predetermined target movement of the focus of the beam;
• generating control signals based on at least one of:
• the at least one parameter as corrected in the correcting step and
• the transfer function as corrected in the correcting step;
• and
• moving the beam deflecting element (31) according to the control signals generated in the generating step, using the drive unit;
• wherein the determining step and the correcting step are performed with one of:
• each activation of the scanner (14) and
• at a predetermined interval of time after each activation.