Patent ID: 7636283

Claim:
An optical disc signal recording method for forming a record mark according to a recording signal as a modulated code by applying a laser beam of a predetermined power level to an optical disc, comprising the steps of: generating a recording pulse having a first period having a first power level Po and a width Wh, a middle period having a second power level Pm lower than the first power level Po and a width Wm, and a last period having a power level substantially equal to the first power level Po and a width of Wt; and forming said record mark, including a code having a length of 3T or 4T, where T represents a channel clock period, or shorter, on said optical disc using said generated recording pulse; wherein the recording to said optical disk is based on a constant angular velocity (CAV) system, said step of generating a recording pulse includes determining and setting said power levels Po and Pm through a liner interpolation as the recording speed is changed, and determining and setting said power levels Po and Pm of said recording pulse through the linear interpolation so that a power level ratio Po/Pm becomes larger as said recording speed is increased, and wherein values of said power levels Po and Pm, and the widths Wh and Wt, of said recording pulse are substantially constant regardless of the length of said recording mark.