Method and device for adjusting an amplification for producing a focus error signal

摘要

In drives for optical storage media, a focus error signal generated by means of weighted addition from main beam and secondary beam focus error signals always contains an undesired component of the track error signal whenever the weighting factors are not exactly tuned to the optical and mechanical properties of the drive actually present and of the storage medium. The invention describes methods for tuning the weighting factors automatically to these properties. The methods are suitable for use directly after the insertion of the storage medium, while some can also be applied without interruption during the writing or reading operation.