DEVICE AND METHOD FOR RECORDING INFORMATION, AND DEVICE AND METHOD FOR INFORMATION RECORDING AND PLAYBACK

摘要

An information recording and playback device (1) comprises: an objective lens driving means (ACT1) which surrounds the outer periphery of, and holds an objective lens (101) while making said objective lens movable; an estimating means (212) which estimates a drive position indicating the position of the objective lens inside the objective lens driving means on the basis of the light returning from one of the recording layers from among a plurality of recording layers (52) of an optical disk in the path of a first light beam (L1) used in recording; a tracking error signal generating means (222) which generates a tracking error signal on the basis of the light returning from the guide layer (51) of an optical disk (50) in the path of a second light beam (L2) used in tracking; an adjusting means (202) which adjusts the generated tracking error signal according to the estimated drive position of the objective lens; and a control means (202) which controls the objective lens driving means to move the objective lens according to the adjusted tracking error.