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, which is produced by a weighted addition consisting of primary and secondary beam focus error signals, always contains an undesired proportion of track error signals when the weighting factors are not exactly matched to the optical and mechanical properties of the concretely existing drive and storage medium. The invention describes methods for automatically matching the weighting factors to these properties. The methods are suited for use directly after inserting the storage medium, of which many can be used in an interruption-free manner also during the writing or reading operation.