DISK DRIVING DEVICE AND METHOD FOR OPTICAL RECORDING AND REPRODUCTION WITH ACCELERATION/DECELERATION OF FOCUSING MEANS BEING BASED ON A FOCUS ERROR SIGNAL LEVEL

摘要

A disk driving device for use in recording and/or reproducing data on an optical recording medium having a plurality of recording layers. When a focus jump operation is executed between the recording layers, an actuator displaces an objective lens in response to a selectively generated acceleration or deceleration pulse and a focus error signal. Instability of the focus jump operation derived from noise superimposed on the focus error signal or from sensitivity variations in the actuator is eliminated.