OPTICAL DISK APPARATUS AND SERVO CONTROL METHOD

摘要

PURPOSE: An optical disk apparatus and a servo control method are provided to prevent oscillation and breakdown of servo control in a transient response state. CONSTITUTION: In an optical disk apparatus, an optical detector converts a reflected laser beam from an optical disk into an electric signal, and tracking control and focus control are executed by using the variation of the electric signal. The optical disk apparatus comprises a control section which takes a timing of variation in signal amplitude of tracking error signal as process start timing to meet a demand for data recording or a demand for data reading, and a hold timing signal output circuit(125) which generates a mask signal to hold the tracking control in timing before or after variation of the signal amplitude.