DRIVING APPARATUS OF AN OPTICAL RECORDING MEDIUM

摘要

A LOW-SPEED FOCUS SERVO OPERATION IN WHICH AN OBJECTIVE LENS (2) IS MOVED SLOWLY IS PERFORMED IN A START PROCESS THAT IS EXECUTED AFTER MOUNTING OF AN OPTICAL RECORDING MEDIUM (90).ONE THE OTHER HAND, A HIGH-SPEED FOCUS SEARCH OPERATION IN WHICH THE OBJECTIVE LENS (2) IS MOVED FAST IS STARTED WHEN FOCUSING IS LOST IN A STATE THAT A FOCUS SERVE OPERATION IS BEING PERFORMED. IN THE HIGH-SPEED FOCUS SEARCH OPERATION, THE FOCUS SERVO CHARACTERISTIC THAT IS DETERMINED BY A CALIBRATION OPERATION THAT IS PERFORMED IN THE START PROCESS.(FIG 1)