Patent ID: 6373797
Filing Date: 2002-04-16
Classification: G11B

Abstract:
An optical information recording/reproducing apparatus for optically recording/reproducing information by irradiating a track on a recording medium with a light beam comprising:detecting means for selectively detecting two areas with a position away by 0.18 to 0.5 times a beam diameter in both sides of a track width direction from a beam center of a reflected light beam reflected by the recording medium as a center and not in contact with the beam center or an outer end of the reflected light beam and obtaining an output signal corresponding to the areas when a track pitch on the recording medium is 0.75; tracking error signal producing means for producing, from the output signal of this detecting means, a tracking error signal indicating a shift in a position of the light beam irradiated on the recording medium in a track width direction; and tracking control means for controlling a irradiation position of the light beam irradiated on the recording medium based on the tracking error signal.