Patent ID: 7342854
Filing Date: 2008-03-11
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 the beams reflected from the recording surface of optical disks; a plurality of comparators for comparing the signals from each light receiving element of the optical detection unit with set reference signals and outputting the signals; an error correction unit for mutually comparing a group of signals, the group of signals including the signals of the compared results from the comparators associated with the light receiving elements of the optical detection unit that are oppositely disposed, determining if there are any errors in the group of signals, and outputting the group of signals after correcting the group of signals; a phase-difference detection unit for mutually comparing the signals corresponding to each light receiving element from the error correction unit within the associated group of signals, and outputting the signals as the phase-difference to correspond to each light receiving element; an adder for mutually adding up the signals output from the phase-difference detection unit that correspond to light receiving elements disposed in the diagonal direction of the optical detection unit; a subtractor for mutually subtracting the signals from the adder and outputting the subtraction result as the tracking error signals.