Patent ID: 7554892

Claim:
A method for recording data in a write-once type optical recording medium wherein data are recorded in the write-once type optical recording medium comprising a substrate and at least one write-once type recording layer formed on the substrate by projecting a laser beam whose power is modulated by a pulse train pattern including at least a pulse whose level is set to a level corresponding to a recording power and a pulse whose level is set to a level corresponding to a first bottom power onto the at least one write-once type recording layer and forming at least two recording marks in the at least one write-once type recording layer, the method comprising: setting a ratio Pb 1 /Pw of a first bottom power Pb 1 to a recording power Pw to 0.1 to 0.5; and setting a ratio AH to be larger than a ratio AL where AL is a ratio of a first level of the first bottom power Pb 1 to a first level of the recording power Pw when data are to be recorded onto the write-once type optical recording medium at a first linear recording velocity and AH is a ratio of a second level of the first bottom power Pb 1 to a second level of the recording power Pw when data are to be recorded onto the write-once type optical recording medium at a second linear recording velocity higher than the first linear recording velocity, while maintaining the ratio Pb 1 /Pw to 0.1 to 0.5 for both the ratio AH and the ratio AL and the recording power Pw substantially constant.