Patent ID: 6031816
Filing Date: 2000-02-29
Classification: G11B

Abstract:
An optical information recording and reproducing device for the use with respect to an optical recording medium, said optical recording medium having a plurality of lands and grooves between the lands, each of the lands and the grooves serving as a track on which a light beam is projected for recording, reproducing, and erasing information, wherein each track has at least one wobble section so that address information is recorded therein, the wobble section having a dispersively wobbled side wall of either the groove or the land, said optical information recording and reproducing device comprising:a photodetector for detecting reflected light obtained by projecting a light beam on said optical recording medium; andan operational unit for detecting a tracking signal in accordance with a signal supplied from said photodetector and extracting wobble frequency components due to the wobble sections out of the tracking signal.