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 (3) ON AN OPTICAL RECORDING MEDIUM (1) HAVING A PLURALITY OF RECORDING LAYERS (86,816,836,837). WHEN A FOCUS JUMP OPERATION IS EXECUTED BETWEEN THE RECORDING LAYERS, AN ACTUATOR DISPLACES AN OBJECTIVE LENS (11) IN RESPONSE TO A SELECTIVELY GENERATED ACCELERATION (81, 811, 831) OR DECELERATION (85,815,835) 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.(FIG. 1)