Optical recording medium for writing data using multiple pulses

An optical recording medium comprising a recording layer configured to record or reproduce object data using light with a predetermined wavelength, the object data configured to be recorded on the recording layer using a mark and a space, whereinna channel clock period is represented by T, the channel clock period T being provided for recording the mark on the recording layer where the mark regarding 3T can be recorded,a plurality of pulses including a last pulse arranged at an end of the pulses are used to record the mark regarding length 3T, the mark regarding length 3T being configured to be recorded with a condition that a width of the last pulse is 0T at minimum and 1.10T at maximum, in which a first subsequent level lower than a peak power level of the last pulse is arranged next to the last pulse, and a second subsequent level lower than the peak power level of the last pulse but higher than a power level of the first subsequent level is arranged next to the first subsequent level.

A method of recording object data on an optical recording medium having a recording layer configured to record or reproduce object data using light with a predetermined wavelength, the object data configured to be recorded on the recording layer using a mark and a space, whereinna channel clock period is represented by T, the channel clock period T being provided for recording the mark on the recording layer where the mark regarding 3T can be recorded,a plurality of pulses including a last pulse arranged at an end of the pulses are used to record the mark regarding length 3T, the mark regarding length 3T being configured to be recorded with a condition that a width of the last pulse is 0T at minimum and 1.10T at maximum, in which a first subsequent level lower than a peak power level of the last pulse is arranged next to the last pulse, and a second subsequent level lower than the peak power level of the last pulse but higher than a power level of the first subsequent level is arranged next to the first subsequent level, the method comprising:recording the object data on the recording layer using the light.

A method of reproducing object data from an optical recording medium having a recording layer configured to record or reproduce object data using light with a predetermined wavelength, the object data configured to be recorded on the recording layer using a mark and a space, whereinna channel clock period is represented by T, the channel clock period T being provided for recording the mark on the recording layer where the mark regarding 3T can be recorded,a plurality of pulses including a last pulse arranged at an end of the pulses are used to record the mark regarding length 3T, the mark regarding length 3T being configured to be recorded with a condition that a width of the last pulse is 0T at minimum and 1.10T at maximum, in which a first subsequent level lower than a peak power level of the last pulse is arranged next to the last pulse, and a second subsequent level lower than the peak power level of the last pulse but higher than a power level of the first subsequent level is arranged next to the first subsequent level, the method comprising:reproducing the object data from the recording layer using the light.

A disc drive for reproducing object data from an optical recording medium having a recording layer configured to record or reproduce object data using light with a predetermined wavelength, the object data configured to be recorded on the recording layer using a mark and a space, whereinna channel clock period is represented by T, the channel clock period T being provided for recording the mark on the recording layer where the mark regarding 3T can be recorded,a plurality of pulses including a last pulse arranged at an end of the pulses are used to record the mark regarding length 3T, the mark regarding length 3T being configured to be recorded with a condition that a width of the last pulse is 0T at minimum and 1.10T at maximum, in which a first subsequent level lower than a peak power level of the last pulse is arranged next to the last pulse, and a second subsequent level lower than the peak power level of the last pulse but higher than a power level of the first subsequent level is arranged next to the first subsequent level, the disc drive comprising:a light emitter configured to emit light to the recording layer;a light receiver configured to receive light reflected from the recording layer to which the light is emitted; anda reproducer configured to reproduce the object data from the recording layer, based on the reflected light.