Patent ID: 7177245
Filing Date: 2007-02-13
Classification: G11B

Abstract:
1. An apparatus for generating tracking error signals, comprising: an optical detection unit, having a plurality of divided light receiving elements, for receiving beams reflected from a recording surface of an optical disk; a comparator for comparing signals, which are the result of adding signals from light receiving elements corresponding to groups of light receiving elements of the optical detection unit, with reference signals, which are set for each group; an error correction unit for mutually comparing a group of signals, the group of signals including the signals of the compared results for each group from the comparators, and determining if there are any errors in the group of signals, and if there are any errors, correcting and outputting the group of signals; a phase-difference detection unit for mutually comparing the signals of each group from the error correction unit and outputting the signals corresponding to the phase-difference for each group; and a subtractor for mutually subtracting the signals for each group from the phase-difference detection unit and outputting the tracking error signals.