Calibration method for control device of optical storage medium drive

• US 20020176333A1
• Filed: 04/24/2002
• Published: 11/28/2002
• Est. Priority Date: 05/25/2001
• Status: Active Grant

• Current Assignee: Tian Holdings LLC (Intellectual Ventures LLC)
• Original Assignee: VIA Technologies Incorporated (VIA Technologies)
• Inventors: Lin, Meng-Fu
• Granted Patent: US 6,882,602 B2
• Time in Patent Office: Days
• US Class Current: 369/44.29
• CPC Class Codes: G11B 7/0941 Methods and circuits for servo gain or phase compensation during operation for initialising servos G11B7/0945
• CPC Class Codes: G11B 7/0945 Methods for initialising servos, start-up sequences

Abstract

A calibration method for a control device of an optical storage medium drive includes generating a calibration-driving signal by a signal generator and then generating a sensing signal by a sensor according to the calibration-driving signal, determining whether each period of the sensing signal is suitable, and comparing suitable periods of the sensing signal with corresponding periods of the calibration-driving signal to determine a phase difference between the sensing signal and the calibration-driving signal so as to adjust gain of a control device of the optical storage medium drive according to the phase difference. The calibration method is capable of preventing the influence of unstable sensing signals and promoting the performance of the optical storage medium drive.

Claims

1. A calibration method for 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 servo device for driving the pickup head;

a signal generator for generating a calibration-driving signal; and

a sensor optically connected to the pickup head for generating a sensing signal;

the calibration method comprising;

deciding periods of the sensing signal; and

comparing the decided periods of the sensing signal with corresponding the calibration-driving signal to determine a phase difference between the decided sensing signal and the calibration-driving signal for adjusting the control device.

2. The calibration method of claim 1, wherein when an amplitude of the sensing signal reaches a predetermined magnitude of the amplitude within the period, it is decided whether the amplitude of the sensing signal is capable of re-reaching the predetermined magnitude of the amplitude after a predetermined time interval.

3. The calibration method of claim 2, wherein the predetermined magnitude of the amplitude is zero.

4. The calibration method of claim 2, wherein the predetermined time interval is a half of the period.

5. The calibration method of claim 1, wherein when an amplitude of the sensing signal reaches a predetermined magnitude of the amplitude within predetermined duration before the period, it is decided whether the amplitude of the sensing signal is capable of re-reaching the predetermined magnitude of the amplitude after a predetermined time interval.

6. The calibration method of claim 1, wherein the sensor is used for sensing a tracking error of the pickup head.

7. The calibration method of claim 1, wherein the sensor is used for sensing a focusing error of the pickup head.

8. 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.

9. The control device of claim 8, wherein when an amplitude of the sensing signal reaches a predetermined magnitude of the amplitude within the period, it is decided determines whether the amplitude of the sensing signal is capable of re-reaching the predetermined magnitude of the amplitude after a predetermined time interval.

10. The control device of claim 9, wherein the predetermined magnitude of the amplitude is zero.

11. The control device of claim 9, wherein the predetermined time interval is a half of the period.

12. The control device of claim 8, wherein when an amplitude of the sensing signal reaches a predetermined magnitude of the amplitude within predetermined duration before the period, it is decided whether the amplitude of the sensing signal is capable of re-reaching the predetermined magnitude of the amplitude after a predetermined time interval.

13. The control device of claim 8, wherein the sensor is used for sensing a tracking error of the pickup head.

14. The control device of claim 8, wherein the sensor is used for sensing a focusing error of the pickup head.

16. The optical storage medium drive of claim 15, wherein when an amplitude of the sensing signal reaches a predetermined magnitude of the amplitude within the period, it is decided determines whether the amplitude of the sensing signal is capable of re-reaching the predetermined magnitude of the amplitude after a predetermined time interval.

17. The optical storage medium drive of claim 16, wherein the predetermined magnitude of the amplitude is zero.

18. The optical storage medium drive of claim 16, wherein the predetermined time interval is a half of the period.

19. The optical storage medium drive of claim 15, wherein when an amplitude of the sensing signal reaches a predetermined magnitude of the amplitude within predetermined duration before the period, it is decided whether the amplitude of the sensing signal is capable of re-reaching the predetermined magnitude of the amplitude after a predetermined time interval.

15. 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.