Patent ID: 7046600
Filing Date: 2006-05-16
Classification: G11B

Abstract:
1. A method of controlling a power of a laser beam irradiated onto a track of an optical disc for recording of data at a given linear velocity, the method comprising: a test recording step of performing test recording into a predetermined area of the optical disc before actual recording of data; a reproduction step of acquiring a reproduction signal that represents a result of the test recording from the predetermined area of the optical disc where the test recording has been carried out; a parameter characteristic acquisition step of acquiring velocity-vs.-parameter characteristic information that is indicative of the relationship between plural levels of the linear velocity and target values of a parameter that represents a target quality of the recording in correspondence with the respective levels of the linear velocity; a derivation step of deriving velocity-vs.-power characteristic information that is indicative of the relationship between the levels of the linear velocity and optimal values of the power based on both of the reproduction signal that represents the result of the test recording and the velocity-vs.-parameter characteristic information; and a control step of controlling the power of the laser beam irradiated onto the optical disc in accordance with the velocity-vs.-power characteristic information at the time of the actual recording.