Method of recording and reproducing an optical recording medium

Details Method of recording and reproducing an optical recording medium Method of recording and reproducing an optical recording medium

2005-11-08

2005-11-08

Psitos, A M (Department: 2653)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S044320, C369S053190, C369S053280

Reexamination Certificate

active

06963520

ABSTRACT:
A method of recording and reproducing an optical recording medium which detects a defocus and a tilt of the optical recording medium and compensates the detected defocus and tilt in a high-density optical recording medium. In a free running state in which only a focus servo is turned on, the amount of defocus offset that corresponds to a maximum level of a tracking error signal is detected in a plurality of positions on inner and outer peripheries of a disc, and a tilt-zero in the respective position is detected and stored, so that a tilt servo and a focus servo are performed with the value stored in the corresponding position during an actual recording/reproduction. The method can prevent the deterioration of quality of data due the defocus during recording/reproduction, enabling real time recording by quickly stabilizing the focus servo, and stable operation of the system. Also, the method can follow corresponding tracks with a rapid stabilization of servo during a search or seek, and detect and compensate for the tilt stably and accurately in the high-density optical disc. The method can also prevent the deterioration of quality of data and a detrack due to the tilt during recording/reproduction, and thus achieve stable operation of the system.

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