Methods and devices for recording marks in an information layer of an optical record carrier, and record carriers for use therein
AssigneeKoninklijke Philips Electronics N.V.
InventorsMartijn Jeroen Dekker, Hendrikus Bernardus Van Den Brink
Life of this patent
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Abstract
Methods and devices or writing an optical record carrier, in which a mark representing recorded data is written in a phase-change layer of a record carrier by a sequence of radiation pulses. A rear heating pulse is introduced after a last write pulse and a front heating pulse is introduced before the first write pulse. The power level of the front heating pulse and the power level of the rear heating pulse may be dependent on the length of the mark to be recorded and on properties of the record carrier.
Claims30
A method of recording marks representing data in a recording medium, the method comprising the acts of:
- providing a recording medium comprising an information layer having a phase which is reversibly changeable between a crystal phase and an amorphous phase, by irradiating the information layer with a pulsed radiation beam;
- recording multiple marks where each mark is written by a sequence of pulses comprising at least one write pulse, the written marks being erasable by irradiating the information layer with a radiation beam having an erase power level, a first write pulse of a sequence of pulses being preceded by a cooling pulse having a cooling power level which is lower than the erase power level, said radiation beam being generated by a radiation source, wherein a last write pulse of a sequence is directly followed by a rear heating pulse having a rear heating power level, the rear heating power level being higher than the erase power level.
A method of recording marks representing data in a recording medium, the method comprising the acts of:
- providing a recording medium comprising an information layer having a phase which is reversibly changeable between a crystal phase and an amorphous phase, by irradiating the information layer with a pulsed radiation beam;
- and
- recording multiple marks where each mark has a length of nT, where T represents the length of one period of a reference clock in a data signal and n represents a predetermined natural number larger than 1, the marks being written by a sequence of pulses comprising (n−1) write pulses, the written marks being erasable by irradiating the information layer with a radiation beam having an erase power level, a first write pulse of a sequence of pulses being preceded by a cooling pulse having a cooling power level which is lower than the erase power level, said radiation beam being generated by a radiation source, wherein the cooling pulse has a first cooling power level when n=2, a second cooling power level when n=3, and a third cooling power level when n≧4, the first cooling power level, the second cooling power level, and the third cooling power level being dependent on properties the radiation source.
A recording device for recording data in the form of marks on a recording medium, said recording medium comprising an information layer having a phase which is reversibly changeable between a crystal phase and an amorphous phase, by irradiating the information layer with a pulsed radiation beam, the recorded marks being erasable by means of irradiating the information layer with a radiation beam having an erase power level, the device comprising a radiation source providing the radiation beam and a control unit for controlling the power of the radiation beam, the control unit being operative for providing a sequence of write pulses for writing a mark and controlling the power of the radiation beam such that it has a cooling power level which is lower than the erase power level preceding a first write pulse of a sequence of pulses, wherein the control unit is operative for controlling the power of the radiation beam such that it has a rear heating pulse having a rear heating power level directly following a last write pulse of a sequence, the rear heating power level being higher than the erase power level.
A recording device for recording data in the form of marks on a recording medium, said recording medium comprising an information layer having a phase which is reversibly changeable between a crystal phase and an amorphous phase, and said marks having lengths of nT, where T represents the length of one period of a reference clock in a data signal and n represents a predetermined natural number larger than 1, by irradiating the information layer by a pulsed radiation beam, the recorded marks being erasable by irradiating the information layer with a radiation beam having an erase power level, the device comprising a radiation source providing the radiation beam and a control unit for controlling the power of the radiation beam, the control unit being operative for providing a sequence of write pulses for writing a mark and controlling the power of the radiation beam such that it has a cooling power level which is lower than the erase power level preceding a first write pulse of a sequence of pulses, wherein the recording device comprises means for determining a first value for the cooling power level when n=2, a second value for the cooling power level when n=3, and a third value for the cooling power level when n≧4, said first value for the cooling power level, said second value for the cooling power level and said third value for the cooling power level being dependent on properties of the radiation source.
A recording device for recording data in the form of marks on a recording medium, said recording medium comprising an information layer having a phase which is reversibly changeable between a crystal phase and an amorphous phase, and said marks having lengths of nT, where T represents the length of one period of a reference clock in a data signal and n represents a predetermined natural number larger than 1, by irradiating the information layer by a pulsed radiation beam, the recorded marks being erasable by irradiating the information layer with a radiation beam having an erase power level, the device comprising a radiation source configured to provide the radiation beam and a control unit configured to control the power of the radiation beam, the control unit being operative for providing a sequence of write pulses for writing a mark and controlling the power of the radiation beam for providing a cooling power level which is lower than the erase power level preceding a first write pulse of a sequence of pulses, wherein the control unit is further configured to determine a first value for the cooling power level when n=2, a second value for the cooling power level when n=3, and a third value for the cooling power level when n≧4, the first value for the cooling power level, the second value for the cooling power level and the third value for the cooling power level being different power levels.
Dependencies are inferred from the claim text.