Patent ID: 7948840

Claim:
An optical disc device comprising: a light source that irradiates an optical beam to an optical disc including a recording layer for recording information and a positioning layer provided with a track for identifying a recording position of the information on the recording layer, an objective lens that converges a predetermined positioning optical beam so as to adjust the optical beam to a desired track on the positioning layer, and also converges an information optical beam that shares an optical axis with the positioning optical beam on the recording layer; a moving section that moves the objective lens in a direction along a radius of the optical disc to make a focal point of the positioning optical beam follow the desired track; a detection section that detects a moving amount of the objective lens with respect to the direction; and a correction section that corrects an offset between a converging position of the information optical beam and a converging position of the positioning optical beam due to the moving amount of the objective lens.