Patent ID: 8169870

Claim:
A recording/reproducing device for forming recording marks on, and reproducing information stored in said recording marks from, an information recording medium using laser pulse sequences in accordance with recording information, said recording/reproducing device comprising: an optical head for irradiating a laser onto the information recording medium so as to record/reproduce the recording marks on/from the information recording medium; laser pulse setting means for setting laser pulse sequences for respectively forming recording marks of a first predetermined recording mark length through a maximum recording mark length, wherein each of said laser pulse sequences includes a top section including a top pulse; and a last section including a cooling period; said laser pulse setting means sets the heat of front edges of the recording marks by using recording parameters for the top sections, wherein the recording parameters are classified in accordance with at least recording mark lengths out of the recording information, and, among the recording parameters, recording parameters of a first predetermined recording mark length through a maximum recording mark length are classified into a same group, said laser pulse setting means sets the heat of rear edges of the recording marks by using cooling start positions for the cooling periods, wherein the cooling start positions are classified in accordance with at least recording mark lengths out of the recording information, and, among the cooling start positions, cooling start positions for a second predetermined recording mark length through the maximum recording mark length are classified into a same group, and the second predetermined recording mark length is longer than the first predetermined recording mark length, wherein said optical head forms said recording marks on the information recording medium based on the output of said laser pulse setting means.