Patent ID: 7646692

Claim:
An apparatus for recording a dye-based recordable DVD medium comprising a unit which records shortest marks and second marks other than the shortest marks, wherein the dye-based recordable DVD medium comprises a substrate and a recording layer formed on the substrate, the substrate comprises a guide groove to which wobble is formed, and the recording layer comprises at least an organic dye, wherein the shortest marks are recorded by use of one pulse beam of which the rear edge is more energized than the front edge, wherein the second marks are recorded by use of one pulse beam of which the two sites of front and rear edges are energized to a power that is less than or equal to the power of the rear edge of the shortest mark, and wherein the power for each of the front and rear edges of each second mark is substantially the same, wherein the respective pulse beams include a cooling pulse at the back edge of the respective pulse beams at 0.1 mW/pulse or less of optical energy, wherein the recording of marks is performed on the recording layer at a recording linear velocity of 42 m/sec or more, and wherein heating pulse width at front edge of a mark, of which just before the space is the shortest, is distinguished depending on whether the mark is the shortest or not, and the heating pulse width at the front edge of the shortest mark is determined to be longer than the heating pulse width at the front edge of other than the shortest mark; and the heating pulse width at the front edge of the shortest mark is distinguished depending on whether the space just before the mark is the shortest or not, and the heating pulse width at the front edge of the mark, of which just before the space is the shortest, is determined to be shorter than the heating pulse width at the front edge of the mark of which just before the space is not the shortest.