Compensating actuator control

摘要

The invention relates to a process and an arrangement for the compensating actuator control or correction of angular misalignments of the optical axis of the objective lens with respect to the optical axis of the scanning device caused by distortion or ageing of the actuator or by the effect of acceleration forces. It is the object of the invention to provide a process and an arrangement which permits the detecting and compensating of an angular deviation of the optical axis of the objective lens from the optical axis of the scanning device, thereby enhancing the reliability with respect to environmental effects and the long-term reliability of the scanning device. According to the invention, the focusing servo-control signal of a focusing servo unit (FS) is superimposed with a signal voltage (UST) of a control-signal generator (STG), is detected in the track error signal (TE) and the control voltage of the focusing actuator coils (2) is influenced according to the phase relationship of the detected signal asymmetrically with a correction voltage counteracting the skewed positioning. The field of application relates to optical scanning devices in which the objective lens is guided by an actuator, such as for example in CD or MOD players. <IMAGE>