Method for tracking an optical disc of a shallow/deep groove type and apparatus adopting the same

A tracking method for tracking an optical disc loaded in a recording and/or reproduction system for both a first depth groove type optical disc and a second depth groove type optical disc, wherein the second depth is deeper than the first depth, the tracking method comprising the steps of:

• (a) detecting a tracking error signal and a radio-frequency signal from the loaded optical disc;
• (b) extracting groove type identification information recorded previously in a header region of the loaded optical disc from the detected radio-frequency signal, to discriminate whether the loaded optical disc is the first depth groove type optical disc or the second depth groove type optical disc based upon the extracted groove type identification information;
• (c) inverting the phase of the detected tracking error signal if the loaded optical disc is discriminated as one of the first depth groove type optical disc and the second depth groove type optical disk, and not inverting the phase of the detected tracking error signal if the loaded optical disc is discriminated as the other one of the first depth groove type optical disc and the second groove type optical disc;
• and
• (d) servo-controlling a beam spot to perform a tracking over a center line of a target track of the loaded optical disc, using the detected tracking error signal obtained in said step (c).

A tracking apparatus for tracking an optical disc loaded in a recording and/or reproduction system for both a first depth groove type optical disc and a second depth groove type optical disc, wherein the second depth is deeper than the first depth, the tracking apparatus comprising:

• an optical signal detector detecting a tracking error signal from the loaded optical disc;
• a groove type discriminator analyzing the tracking error signal detected from said optical signal detector, discriminating whether the loaded optical disc is the first depth groove type optical disc or the second depth groove type optical disc, and generating a control signal corresponding to the discrimination;
• a phase corrector correcting the phase of the tracking error signal detected from the optical signal detector according to the control signal from the groove type discriminator;
• and
• a tracking servo portion servo-controlling a beam spot to perform a tracking over a center line of a target track of the loaded optical disc, using the phase corrected tracking error signal obtained from said phase corrector.

A tracking apparatus for tracking an optical disc loaded in a recording and/or reproduction system for both a first depth groove type optical disc and a second depth groove type optical disc, wherein the second depth is deeper than the first depth, the tracking apparatus comprising:

• an optical signal detector detecting a tracking error signal and a radio-frequency signal from the loaded optical disc;
• a groove type discriminator extracting groove type identification information recorded previously in a header region of the optical disc from the detected radio-frequency signal by said optical signal detector, to discriminate whether the loaded optical disc is the first depth groove type optical disc or the second depth groove type optical disc, and generating a control signal corresponding to the discrimination result;
• a phase corrector inverting a phase of the tracking error signal output from the optical signal detector if the control signal is indicative of one of the first depth groove type optical disc and the groove type optical disc, and not inverting the phase of the tracking error signal output from the optical signal detector if the control signal is indicative of the other one of the first depth groove type optical disc and the second depth groove type optical disc, to generate a phase corrected tracking error signal;
• and
• a tracking servo portion servo-controlling a beam spot to perform a tracking over a center line of a target track of the loaded optical disc, using the phase corrected tracking error signal.

A tracking method for tracking an optical disc loaded in a recording and/or reproduction system for both a first depth groove type optical disc and a second depth groove type optical disc, wherein the second depth is deeper than the first depth, the tracking method comprising the steps of:

• (a) analyzing a tracking error signal detected from the loaded optical disc, to discriminate whether the optical disc is the first depth groove type optical disc or the second depth groove type optical disc;
• (b) inverting a phase of the detected tracking error signal based upon the discrimination of the loaded optical disc in said step (a), to output a phase sensitive tracking error signal;
• and
• (c) servo-controlling a beam spot to perform a tracking over a center line of a target track of the loaded optical disc, using the phase sensitive tracking error signal output in said step (b).

A tracking apparatus for tracking an optical disc loaded in a recording and/or reproduction system for both a first depth groove type optical disc and a second depth groove type optical disc, wherein the second depth is deeper than the first depth, the tracking apparatus comprising:

• an optical signal detector detecting a tracking error signal from the loaded optical disc;
• a groove type discriminator analyzing the tracking error signal detected from said optical signal detector, discriminating whether the loaded optical disc is the first depth groove type optical disc or the second depth groove type optical disc, and generating a control signal corresponding to the discrimination;
• a phase corrector inverting a phase of the detected tracking error signal based upon the discrimination of the loaded optical disc, to output a phase sensitive tracking error signal;
• and
• a tracking servo portion servo-controlling a beam spot to perform a tracking over a center line of a target track of the loaded optical disc, using the phase sensitive tracking error signal.

A tracking method for tracking an optical disc loaded in a recording and/or reproduction system for both a first depth groove type optical disc and a second depth groove type optical disc, wherein the second depth is deeper than the first depth, the tracking method comprising the steps of:

• (a) analyzing a tracking error signal detected from the loaded optical disc, to discriminate whether the optical disc is the first depth groove type optical disc or the second depth groove type optical disc;
• (b) adjusting a phase of the detected tracking error signal based upon the discrimination of the loaded optical disc, to match the phase of the detected tracking error signal with a phase of associated with one of the first and second groove depth type optical discs, to output a phase sensitive tracking error signal;
• and
• (c) servo-controlling a beam spot to perform a tracking over a center line of a target track of the loaded optical disc, using the phase sensitive tracking error signal output in said step (b).