Patent ID: 6760287
Filing Date: 2004-07-06
Classification: G11B

Abstract:
An apparatus for an optical disk unit having a light source for irradiating a light beam on a recordable optical disk, rotationally driving means for rotating the optical disk, recording rotation control means for controlling the rotationally driving means to rotate the optical disk when recording information, test write means for carrying out a test write prior to recording, setting means for presetting a value &thgr;1which prescribes an optimum recording pulse width of the light source and reference optimum recording power determination means for reproducing data recorded by the test write and determining an optimum recording power value Pwo based on characteristic values of the reproduced data, said apparatus comprising:light emission waveform updating computation means for calculating (a) a value &thgr;1(v) which prescribes a recording pulse width and (b) an optimum recording power Pwo(v), depending on an arbitrary linear velocity v at a recording target track which is to be recorded, by adding corrections dependent on the arbitrary linear velocity v with respect to (i) the value &thgr;1which prescribes the optimum recording pulse width when recording the information and (ii) the optimum recording power value Pwo; and recording light source control means for controlling a light emission waveform of the light source during recording based on the value &thgr;1(v) which prescribes the recording pulse width and the optimum recording power Pwo(v).