Calibration method for control device of optical storage medium drive

A control device of an optical storage medium drive, the optical storage medium drive comprising:

• a pickup head for reading or recording data from or to an optical storage medium;
• a signal generator electrically for generating a calibration-driving signal;
• and
• a sensor optically connected to the pickup head for generating a sensing signal;
• the control device comprising:
• a servo device for driving the pickup head;
• wherein when the pickup head is driven by the calibration-driving signal, the control device decides periods of the sensing signal;
• and compares the decided periods of the sensing signal with corresponding the calibration-driving signal to determine a phase difference between the sensing signal and the calibration-driving signal for adjusting the control device.

An optical storage medium drive, comprising:

• a pickup head for reading or recording data from or to an optical storage medium;
• a servo device for driving the pickup head;
• a signal generator electrically connected to the servo device for generating a calibration-driving signal;
• and
• a sensor optically connected to the pickup head for generating a sensing signal;
• wherein when the pickup head is driven by the calibration-driving signal, the control device decides period of the sensing signal;
• and compares the decided periods of the sensing signal with the calibration-driving signal to determine a phase difference between the decided sensing signal and the calibration-driving signal for adjusting the control device.