Patent ID: 6160784
Filing Date: 2000-12-12
Classification: G11B

Abstract:
An information recording method having first and second recording methods for recording first and second information on a recording medium using any one or both of said recording methods wherein in said first recording method, said recording medium can be formed to have a first state zone with a first power level of an energy beam and to have a second state zone with a second power level of the energy beam higher than said first power level, information recording on the recording medium is carried out by relatively moving said energy beam and said recording medium to irradiate said energy beam on said recording medium and to form said first and second state zones with predetermined lengths and with a predetermined spacing therebetween on said recording medium, a third power level lower than said second power level is provided, and at the time of forming said second state zone having a specific length on said recording medium, a duration of said third power level is included as mixed in a duration of said second power level to convert said energy beam to a multi-pulsed train, said energy beam of the multi-pulsed train is irradiated on said recording medium, and wherein, in said recording method, change-over is carried out as necessary between a first timing adjustment method for changing an energy level rising edge timing of a head pulse in said multi-pulsed energy beam train according to combinations of pieces of information to be recorded and for substantially fixing an energy level falling edge timing of said head pulse and a second timing adjustment method for changing an energy level rising edge timing of the head pulse in said multi-pulsed energy beam train according to combinations of pieces of information to be recorded and for changing the energy level falling edge timing of said head pulse according to the combinations of pieces of information to be recorded, to thereby irradiate said energy beam on said recording medium for recording, and wherein, said second recording method, change-over is carried out as necessary between a third timing adjustment method for changing an energy level falling edge timing of a tail pulse in said multi-pulsed energy beam train according to the combinations of pieces of information to be recorded and for substantially fixing an energy level rising edge timing of said tail pulse and a fourth timing adjustment method for changing the energy level falling edge timing of the tail pulse in said multi-pulsed energy beam train according to the combinations of pieces of information to be recorded and for changing the energy level rising edge timing of said tail pulse according to the combinations of pieces of information to be recorded, to thereby irradiate said energy beam on said recording medium for recording.