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AssigneeTDK Corporation
InventorsHironori Kakiuchi, Hiroyasu Inoue
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A method for recording data in an optical recording medium according to present invention is constituted so that data are recorded in an optical recording medium including a light transmission layer and two recording layers by projecting a laser beam whose power is pulse-like modulated between a recording power and a bottom power lower than the recording power onto the optical recording medium from a side of the light transmission layer and forming recording marks having different lengths in the recording layers and that when a recording mark having a longer length than that of the shortest recording mark is to be formed in the recording layers by modulating the power of a laser beam using a single pulse, a time of raising the power of the laser beam to the recording power is delayed relative to a time of raising the power of the laser beam to the recording power when the shortest recording mark is to be formed. In the case of recording data in the optical recording medium in accordance with the thus constituted method for recording data in an optical recording medium, jitter of a reproduced signal obtained by reproducing the recorded data can be markedly reduced.
A method for recording data in an optical recording medium wherein data are recorded in an optical recording medium including a light transmission layer and at least one recording layer by projecting a laser beam whose power is pulse-like modulated between at least a recording power and a bottom power lower than the recording power onto the optical recording medium from a side of the light transmission layer and forming recording marks having different lengths, which method for recording data in an optical recording medium is constituted so that when a recording mark having a longer length than that of the shortest recording mark is to be formed in the at least one recording layer by modulating the power of a laser beam using a single pulse, a time of raising the power of the laser beam to the recording power is delayed relative to a time of raising the power of the laser beam to the recording power when the shortest recording mark is to be formed.
An apparatus for recording data in an optical recording medium, which comprises a laser beam source for emitting a laser beam, an objective lens, a laser power controlling means for pulse-like modulating a power of a laser beam emitted from a laser beam source between a recording power and a bottom power lower than the recording power, a memory and a control unit for controlling overall operation, the control unit being constituted so as to create, based on ID data recorded in the optical recording medium and stored in the memory, a recording strategy determined so that when a recording mark having a longer length than that of the shortest recording mark is to be formed in a recording layer of the optical recording medium by modulating the power of a laser beam using a single pulse, a time of raising the power of the laser beam to the recording power is delayed relative to a time of raising the power of the laser beam to the recording power when the shortest recording mark is to be formed, thereby forming a recording mark in the recording layer.
Dependencies are inferred from the claim text.