Patent ID: 7916585

Claim:
An optical disc drive for recording and/or reading information on and/or from an optical disc having at least one recording surface by bringing an information light beam to a focus at a target recording position on the recording surface of the disc by an objective lens, the optical disc having a reflective surface on which position-guiding elements for determining a position at which the information is recorded are formed, the optical disc drive comprising: a position controller which controls the position of the objective lens based on the position-controlling light beam reflected by the reflective surface by condensing the position-controlling light beam by the objective lens such that the position-controlling light beam is brought to a focus at a target guide position on the reflective surface corresponding to the target recording position; a tilt angle detector which detects tilt angle of the optical disc relative to optical axis of the position-controlling light beam; and a focal position corrector which makes a correction such that a focal position obtained when the information light beam is condensed by the objective lens is aligned to the target recording position according to the tilt angle and a target depth, said target depth being a distance from a reflection layer to a target recording layer.