Patent ID: 8013288

Claim:
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.