READ AND/OR WRITE DEVICE OF OPTICAL RECORDING MEDIUM, METHOD OF DETERMINING CORRECT TRACK ERROR SIGNAL BY PHASE DETECTING METHOD

摘要

PPROBLEM TO BE SOLVED: To provide a device to determine phase difference signals as correctly as possible and a method of determining correct tracking error signals by using a phase detecting mechanism. PSOLUTION: This device has an edge sequence detector 14 to detect the edge sequences of the output signals (A+C, B+D), and a signal blocking mechanism 15 to block the phase difference output signal () from the phase detection mechanism 13, and prevents wrong phase detection signals from being outputted. PCOPYRIGHT: (C)2009,JPO&INPIT