Information recording apparatus, method and computer program product

An information recording system for recording information in a recording medium by directing light from a light source, said recording medium comprising a recording layer having a phase reversibly changeable between a crystal phase and an amorphous phase,

• said light source emitting multi-pulse light which includes, in order, a head heating pulse, a head cooling pulse, and following rear heating pulse and rear cooling pulse, said multi-pulse light forming a record mark in said recording layer, and
• wherein light-emission power of the cooling pulse immediately following said head heating pulse is lower than the light-emission power of another following cooling pulse.

An information recording system for recording information in a recording medium by directing light from a light source, said recording medium comprising a recording layer having a phase reversibly changeable between a crystal phase and an amorphous phase,

• said light source emitting multi-pulse light which includes, in order, a head heating pulse, a head cooling pulse, and following rear heating pulse and rear cooling pulse, said multi-pulse light forming a record mark in said recording layer, and
• wherein a difference in light-emission power between a tail heating pulse of said rear heating pulse and an immediately following cooling pulse is larger than a difference in light-emission power between another heating pulse and an immediately following cooling pulse.

An information recording system for recording information in a recording medium by directing light from a light source, said recording medium comprising a recording layer having a phase reversibly changeable between a crystal phase and an amorphous phase,

• said light source emitting multi-pulse light which includes, in order, a head heating pulse, a head cooling pulse, and following rear heating pulse and rear cooling pulse, said multi-pulse light forming a record mark in said recording layer, and
• wherein said head heating pulse includes a front division and a rear division, each difference in light-emission power between said rear division of said head heading pulse and an immediately following cooling pulse and difference between a tail heating pulse of said rear heating pulse and an immediately following cooling pulse is larger than a difference in light-emission power between another heating pulse and the immediately following cooling pulse.

An information recording system for recording information in a recording medium by directing light from a light source, said recording medium comprising a recording layer having a phase reversibly changeable between a crystal phase and an amorphous phase,

• said light source emitting multi-pulse light which includes, in order, a head heating pulse, a head cooling pulse, and following rear heating pulse and rear cooling pulse, said multi-pulse light forming a record mark in said recording layer, and
• wherein said head heating pulse includes a front division and a rear division, light-emission power of said rear division of said head heating pulse is higher than another heating pulse, the light-emission power of said head cooling pulse immediately following said head heating pulse is lower than the light-emission power of another cooling pulse, the light-emission power of a tail heating pulse of said rear heating pulse is approximately equal to the light-emission power of said rear division of said head heating pulse, the light-emission power of the tail cooling pulse which immediately follows a tail heating pulse of said rear heating pulse is lower than the light-emission power of another cooling pulse.

An information recording system for recording information in a recording medium by directing light from a light source, said recording medium comprising a recording layer having a phase reversibly changeable between a crystal phase and an amorphous phase,

• said light source emitting multi-pulse light which includes, in order, a head heating pulse, a head cooling pulse, and following rear heating pulse and rear cooling pulse, said multi-pulse light forming various lengths of record marks in said recording layer, so that information is recorded in said recording medium, and
• wherein a total span from said head heating pulse to a tail cooling pulse is changed depending on a shortest-length record mark size and an effective spot diameter of said light on said recording medium.

An information recording system for recording information in a recording medium by directing light from a light source, said recording medium comprising a recording layer having a phase reversibly changeable between a crystal phase and an amorphous phase,

• said light source emitting multi-pulse light which includes, in order, a head heating pulse, a head cooling pulse, and following rear heating pulse and rear cooling pulse, said multi-pulse light forming various lengths of record marks in said recording layer, so that information is recorded in said recording medium, and
• wherein said head heating pulse is divided into a front division and a rear division, at least one of a difference in light-emission power between said rear division of said head heating pulse and an immediately following cooling pulse and a difference in light-emission power between a tail heating pulse of said rear heating and an immediately following cooling pulse is changed from a difference between another heating pulse and an immediately following cooling pulse, depending on a shortest-length record mark size and an effective spot diameter of said light on said recording medium.

An information recording system for recording information in a recording medium by directing light from a light source, said recording medium comprising a recording layer having a phase reversibly changeable between a crystal phase and an amorphous phase,

• said light source emitting multi-pulse light which includes, in order, a head heating pulse, following rear cooling pulse and rear heating pulse and a tail cooling pulse, said multi-pulse light forming a record mark in said recording layer, and
• wherein, when recording data of a mark length is recorded by one of an even-number T and an odd-number T, where T represents each period of reference clock pulses, a pulse span of each of said rear cooling pulse and rear heating pulse is approximately equal to said period T.

A computer-implemented information recording method, for recording information in a recording medium by directing light from a light source, said recording medium comprising a recording layer having a phase reversibly changeable between a crystal phase and an amorphous phase, said light source emitting multi-pulse light which includes, in order, a head heating pulse, a head cooling pulse, and following rear heating pulse and rear cooling pulse, said multi-pulse light forming a record mark in said recording layer,

• comprising a step of setting light-emission power of the cooling pulse immediately following said head heating pulse to be lower than the light-emission power of another following cooling pulse.

A computer-implemented information recording method for recording information in a recording medium by directing light from a light source, said recording medium comprising a recording layer having a phase reversibly changeable between a crystal phase and an amorphous phase, said light source emitting multi-pulse light which includes, in order, a head heating pulse, a head cooling pulse, and following rear heating pulse and rear cooling pulse, said multi-pulse light forming a record mark in said recording layer,

• comprising a step of setting a difference in light-emission power between a tail heating pulse of said rear heating pulse and an immediately following cooling pulse to be larger than a difference in light-emission power between another heating pulse and an immediately following cooling pulse.

A computer-implemented information recording method for recording information in a recording medium by directing light from a light source, said recording medium comprising a recording layer having a phase reversibly changeable between a crystal phase and an amorphous phase, said light source emitting multi-pulse light which includes, in order, a head heating pulse, a head cooling pulse, and following rear heating pulse and rear cooling pulse, said multi-pulse light forming various length of record marks in said recording layer and thus information being recorded in said recording medium,

• comprising a step of changing a total span from said head heating pulse to said tail cooling pulse depending on a shortest-length record mark size and an effective spot diameter of said light on said recording medium.

A computer-implemented information recording method for recording information in a recording medium by directing light from a light source, said recording medium comprising a recording layer having a phase reversibly changeable between a crystal phase and an amorphous phase, said light source emitting multi-pulse light which includes, in order, a head heating pulse, following rear cooling pulse and rear heating pulse and a tail cooling pulse, said multi-pulse light forming a record mark in said recording layer,

• comprising a step of setting, when recording data is recorded of a mark length of one of an even-number of times of T and an odd-number T, where T represents each period of reference clock pulses, the pulse span of each of said rear cooling pulse and rear heating pulse be approximately equal to said period T.

A computer program product for recording information in a recording medium by directing light from a light source, said recording medium comprising a recording layer having a phase reversibly changeable between a crystal phase and an amorphous phase, said light source emitting multi-pulse light which includes, in order, a head heating pulse, a head cooling pulse, and following rear heating pulse and rear cooling pulse, said multi-pulse light forming a record mark in said recording layer, comprising:

• a computer-usable medium having computer readable program code means embodied in said medium, said computer readable program code means comprising:
• program code means for setting light-emission power of the cooling pulse immediately following said head heating pulse be lower than the light-emission power of another following cooling pulse.

A computer program product for recording information in a recording medium by directing light from a light source, said recording medium comprising a recording layer having a phase reversibly changeable between a crystal phase and an amorphous phase, said light source emitting multi-pulse light which includes, in order, a head heating pulse, a head cooling pulse, and following rear heating pulse and rear cooling pulse, said multi-pulse light forming a record mark in said recording layer,

• comprising:
• a computer-usable medium having computer readable program code means embodied in said medium, said computer readable program code means comprising:
• program code means for setting a difference in light-emission power between a tail heating pulse of said rear heating pulse and an immediately following cooling pulse be larger than a difference in light-emission power between another heating pulse and an immediately following cooling pulse.

A computer program product for recording information in a recording medium by directing light from a light source, said recording medium comprising a recording layer having a phase reversibly changeable between a crystal phase and an amorphous phase, said light source emitting multi-pulse light which includes, in order, a head heating pulse, a head cooling pulse, and following rear heating pulse and rear cooling pulse, said multi-pulse light forming various length of record marks in said recording layer and thus information being recorded in said recording medium,

• comprising:
• a computer-usable medium having computer readable program code means embodied in said medium, said computer readable program code means comprising:
• program code means for changing a total span from said head heating pulse to a tail cooling pulse depending on a shortest-length record mark size and an effective spot diameter of said light on said recording medium.

A computer program product for recording information in a recording medium by directing light from a light source, said recording medium comprising a recording layer having a phase reversibly changeable between a crystal phase and an amorphous phase, said light source emitting multi-pulse light which includes, in order, a head heating pulse, following rear cooling pulse and rear heating pulse and a tail cooling pulse, said multi-pulse light forming a record mark in said recording layer,

• comprising:
• a computer-usable medium having computer readable program code means embodied in said medium, said computer readable program code means comprising:
• program code means for setting, when recording data is provided of a mark length of one of an even-number T and an odd-number T, where T represents each period of reference clock pulses, the pulse span of each of said rear cooling pulse and rear heating pulse be approximately equal to said period T.