Method and apparatus for controlling layer change of optical...

Details Method and apparatus for controlling layer change of optical... Method and apparatus for controlling layer change of optical...

2007-10-16

2007-10-16

Korzuch, William (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

Reexamination Certificate

active

10299812

ABSTRACT:
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.

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