Speed of a compact disk drive

摘要

The present invention relates to a method for adjusting the rotating speed of a compact disc drive to prevent unwanted vibrations of a compact disc rotating within. The compact disc drive comprises a reading head for reading data stored in a track of the compact disc and generating a data signal and a track signal; a rotating driver for driving the compact disc; a speed control circuit for controlling the rotating speed of the rotating driver; a track driver for moving the reading head along a diameter of the compact disc; a track driving circuit for controlling the track driver; and a track servo circuit for controlling the track driving circuit according to the track signal generated by the reading head and a track correction gain so that the track driver can move the reading head along the diameter of the compact disc along its track. The speed adjustment method comprises the following steps: (1) lowering the track correction gain to a predetermined value; (2) using the speed control circuit to gradually increase the rotating speed of the rotating driver, and using a vibration detecting procedure to examine the track signal, determine whether a vibration occurs, and record the rotating speed at which the vibration occurs; (3) if the vibration occurs, lowering the rotating speed of the compact disc drive to a level less than the speed at which the vibration occurs; and (4) restoring the track correction gain.