Method and device for recording an optical information carrier
AssigneeU.S. Philips Corporation
InventorJohannes Hendrik Spruit
Life of this patent
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Abstract
A recording layer of rewritable phase-change material is directly overwritten by a pulsing laser spot irradiating at a writing power level, then irradiating at a lower cool-down power level during a cool-down period, and then irradiating at an erasing level with a higher power than the cool-down level. The duration of the cool-down period depends on the spot size and/or on the linear velocity of the spot with respect to the recording layer.
Claims26
A method of recording marks representing data in an information layer of an optical information carrier comprising the steps of:
- moving the carrier with respect to a radiation beam so that linear writing speed varies during recording so that different portions of the same carrier are recorded at different linear writing speeds;
- writing a mark on the carrier by a sequence of one or more irradiation pulses, in which the last pulse in the sequence has a first power level;
- irradiation at a second power level lower than the first power level during a cooling period to allow the carrier to cool after writing the mark the duration of the cooling period depending on the linear writing speed and being equal or greater than 0.5 times the duration of a data clock period;
- and
- irradiating at a third power level higher than the second power level to provide an unmarked space between marks.
A method of recording marks representing data in an information layer of an optical information carrier comprising the steps of:
- moving the carrier with respect to a radiation beam so that linear writing speed varies during recording so that different portions of the same carrier are recorded at different linear writing speeds;
- writing a mark on the carrier by a sequence of one or more irradiation pulses, in which the last pulse in the sequence has a first power level;
- irradiation at a second power level lower than the first power level during a cooling period to allow the carrier to cool after writing the mark;
- and
- irradiating at a third power level higher than the second power level to provide an unmarked space between marks
- and wherein the duration of the cooling period lies between 0.09 and 0.27 times λ/(NA*v), where λ is the wavelength of the radiation of the beam, NA is the numerical aperture of the beam incident on the information layer, and v is the linear writing speed.
A method of recording marks representing data, at a writing speed in an information layer of an optical information carrier by irradiating the information layer by a pulsed radiation beam comprising the steps of:
- moving the carrier with respect to a radiation beam;
- writing a mark on the carrier by a sequence of one or more irradiation pulses wherein the last pulse in the sequence has a first power level;
- and
- irradiating at a second power level lower than the first power level to allow the carrier to cool during a cooling period;
- irradiating at a third power level higher than the second power level to provide an unmarked space between marks;
- and in which the duration of the cooling period is approximately between 0.09 and 0.27 times λ/(NA*v) where λ is the wavelength of the radiation of the beam, NA is the numerical aperture of the beam incident on the information layer, and v is the writing speed.
An optical recording device for recording data in the form of marks on an information layer of an information carrier, the device comprising:
- a radiation source providing a radiation beam for writing the marks;
- means for moving the information carrier with respect to the beam so that the linear writing speed varies with different portions of the same carrier are recorded at different linear writing speeds;
- and
- a control unit for controlling the power of the radiation beam depending on the linear writing speed including:
- means for providing a sequence of one or more irradiation pulses having a first power level for writing a mark;
- means for providing irradiation at a second power level during a cooling period to allow the carrier to cool after writing the mark, the duration of the cooling period depending on the linear writing speed and being equal or greater than 0.5 times the duration of a data clock period;
- and
- means for providing irradiation at a third power level to provide an unmarked space between marks.
An optical recording device for recording data in the form of marks on an information layer of an information carrier, the device comprising:
- a radiation source providing a radiation beam for writing the marks;
- means for moving the information carrier with respect to the beam so that the linear writing speed varies with different portions of the same carrier are recorded at different linear writing speeds;
- and
- a control unit for controlling the power of the radiation beam depending on the linear writing speed including:
- means for providing a sequence of one or more irradiation pulses having a first power level for writing a mark;
- means for providing irradiation at a second power level during a cooling period to allow the carrier to cool after writing the mark;
- and
- means for providing irradiation at a third power level to provide an unmarked space between marks;
- and wherein:
- the device has a writing speed v;
- the radiation beam has a numerical aperture NA and a wavelength λ;
- and the cooling period lies between 0.09 and 0.27 times λ/(NA*v).
A method of recording marks representing data in an information layer of an optical information carrier comprising the steps of:
- moving the carrier with respect to a radiation beam so that linear writing speed varies during recording so that different portions of the same carrier are recorded at different linear writing speeds;
- writing a mark on the carrier by a sequence of one or more irradiation pulses, in which the last pulse in the sequence has a first power level;
- irradiation at a second power level lower than the first power level during a cooling period to allow the carrier to cool after writing the mark, the duration of the cooling period depending on the spot size of the radiation on the carrier and the linear writing speed;
- and
- irradiating at a third power level higher than the second power level to provide an unmarked space between marks.
An optical recording device for recording data in the form of marks on an information layer of an information carrier, the device comprising:
- a radiation source providing a radiation beam for writing the marks;
- means for moving the information carrier with respect to the beam so that the linear writing speed varies with different portions of the same carrier are recorded at different linear writing speeds;
- a control unit for controlling the power of the radiation beam depending on the linear writing speed including:
- means for providing a sequence of one or more irradiation pulses having a first power level for writing a mark;
- means for providing irradiation at a second power level during a cooling period to allow the carrier to cool after writing the mark, the duration of the cooling period depending on a spot size of the radiation on the carrier and the linear writing speed;
- and
- means for providing irradiation at a third power level to provide an unmarked space between marks.
Dependencies are inferred from the claim text.