Patent ID: 8503273

Claim:
An optical disc device for recording/reproducing information on a multilayer optical disc which has a servo layer having a guide track and a plurality of recording layers for recording/reproducing information, comprising: a light source for servo configured to irradiate a light beam for servo to the servo layer; a recording/reproducing light source configured to irradiate a recording/reproducing beam to the recording layers; an objective lens configured to condense the light beam for servo and the recording/reproducing beam; a track error detection unit configured to detect a first deviation amount between the optical axis of the light beam for servo and the guide track from the reflection of the light beam for servo; a radial tilt error detection unit configured to detect a second deviation amount between the optical axis of the recording/reproducing beam and the recorded mark from the reflection of the recording/reproducing beam; a track actuator configured to move the objective lens in a radial direction; and a radial tilt actuator configured to tilt the objective lens; wherein: the first deviation amount from the guide track is corrected by the track actuator, the second deviation amount from the recorded mark is corrected by the radial tilt actuator, the guide track is added with address information which becomes position information, and when servo address information read from the light beam for servo does not agree with reproduction address information read from the recording/reproducing beam, the radial tilt actuator is moved to agree the reproduction address information with the servo address information.