Method and apparatus for controlling layer change of optical media

摘要

A layer change control method and an apparatus for an optical medium in which a layer change is accurately performed even where there is a level deviation of a focus actuator error signal (FE). The layer change control method includes measuring a needed time from where a focus point of the optical medium breaks away from a current layer to where the focus point arrives at a desired layer, and controlling a focus driving voltage needed to pull the focus point of the optical medium into the desired layer, and a time to output the focus driving voltage by using the needed time. Therefore, since a layer change can always be accurately performed even where there is a deviation in a FE level, according to the physical characteristic and operational deviation of a focus actuator, a stable disc driving environment can be provided.