Patent ID: 6704269
Filing Date: 2004-03-09
Classification: G11B

Abstract:
An optical disk recording apparatus capable of recording on both a cyanine-based optical disk and a phthalocyanine-based optical disk at a variably selected recording speed, said optical disk recording apparatus comprising:a control section that, in accordance with a length of a pit to be recorded, controls a laser power irradiation time to have a length of (nâˆ’K)T+&Dgr;3T, where nT represents the length of a pit to be formed, n represents a mark length, T represents a clock period, K is a constant and &Dgr;3T represents an extra laser power value for addition to recording of a 3T pit, said control section also performing control for imparting an additional top power pulse to an initial part of each pit-forming laser power irradiation so as to increase a level of the laser power over a standard recording power level temporarily for a predetermined time period, wherein said control section performs further control for changing values of the K and &Dgr;3T and a level of the additional top power pulse in accordance with information representative of a disk type and selected recording speed that is input to or detected via said optical disk recording apparatus, in such a way that the K is set to a value in a range of 0.1 to 0.25 and the &Dgr;3T is set to a value in the range of 0.05T to 0.15T for recording on the cyanine-based optical disk at six-times recording speed, and that, for recording on the phthalocyanine-based optical disk at the six-times recording speed, the K is set to a value in a range of 0.1 to 0.25 and the additional top power pulse is set to a width of 1.25T and a level substantially equal to 10%-20% of a level difference between top laser power and bottom laser power used in the recording so as to achieve a predetermined laser power irradiation or set to another width and level capable of achieving laser power irradiation similar to said predetermined laser power.