Patent ID: 6219318
Filing Date: 2001-04-17
Classification: G11B

Abstract:
An optical disc drive for recording and playing back a recordable-type optical disc having a pre-groove which carries time information representing a position on the optical disc, the optical disc drive comprising:a driving mechanism for rotating the optical disc;an optical pick-up for writing and reading data to and from the optical disc;signal processing means for processing signals read out from the optical disc by means of the optical pick-up;control means for controlling at least the driving mechanism, the optical pick-up and the signal processing means;a first synchronizing signal generating means for generating a first synchronizing signal based on a signal from the optical pick-up which receives reflected light from the pre-groove; anda second synchronizing signal generating means for generating a second synchronizing signal which has the same cycle as that of the first synchronizing signal;synchronizing means for synchronizing the first synchronizing signal with the second synchronizing signal;time information acquiring means for acquiring the time information corresponding to the first synchronizing signal based on signal from the optical pick-up which receives reflected light from the pre-groove; anda memory for storing the time information, wherein the stored time information is rewritten in synchronization with the second synchronizing signal which is synchronized with the first synchronizing signal.