Patent ID: 8072864

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; and laser pulse setting means for setting first pulse sequences for respectively forming recording marks of a first predetermined recording mark length through a maximum recording mark length, each of said first pulse sequences including: a top section including a top pulse; a last section including a last pulse and a cooling period; and an intermediate section including an intermediate period provided between the top section and the last section; and second pulse sequences respectively forming recording marks of a recording mark length shorter than the first predetermined recording mark length through a minimum recording mark length, each of said second pulse sequences including: a top section including a top pulse; and a last section including no last pulse and a cooling period, said laser pulse setting means sets a heat of front edges of the recording marks by using recording parameters for the top sections, wherein the recording parameters for the top sections are classified in accordance with at least recording mark lengths out of the recording information, and, among the recording parameters for the top sections, recording parameters for top sections of the first predetermined recording mark length through the maximum recording mark length are classified into a same group, said laser pulse setting means sets a heat of rear edges of the recording marks by using recording parameters for the last sections, wherein the recording parameters for the last sections are classified in accordance with at least recording mark lengths out of the recording information, and, among the recording parameters for the last sections, recording parameters for last sections of 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 an output of said pulse setting means.