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AssigneeTDK Corporation
InventorsSyuji Tsukamoto, Takashi Horai
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It is an object of the present invention to provide a method for recording data in a write-once type optical recording medium which can record data by forming a recording mark having a desired length and reduce jitter of a reproduced signal. The method for recording data in an optical recording medium according to the present invention is constituted so as to project a laser beam onto a write-once type optical recording medium including a light transmissible substrate 11 and a recording layer 21 and form a recording mark in the recording layer 21, thereby recording data therein and the method for recording data in an optical recording medium comprises steps of determining a pulse train pattern so that a level of a pulse is switched from the level corresponding to the level of the recording power Pw to the level corresponding to the level of the bottom power Pb in accordance with the length of a blank region to be formed immediately after formation of a first recording mark and the length of a second recording mark formed subsequent to the formation of the first recording mark, modulating the power of laser beam in accordance with the thus determined pulse train pattern, projecting the laser beam onto the optical recording medium and forming the first recording mark. According to the present invention, since the pulse train pattern is determined so that the level of a pulse of a pulse train pattern used for forming a first recording mark is switched from the level corresponding to the level of the recording power Pw to the level corresponding to the level of the bottom power Pb in accordance with the length of a blank region to be formed immediately after formation of the first recording mark and the length of a second recording mark formed subsequent to the formation of the first recording mark, the first recording mark can be formed so that the length thereof is not influenced by the length of the blank region to be formed immediately after formation of the first recording mark and the length of the second recording mark and it is therefore possible to form a recording mark having a desired length, thereby recording data, and reduce jitter of a reproduced signal.
A method for recording data in an optical recording medium constituted so as to project a laser beam whose power is modulated in accordance with a pulse train pattern including at least a pulse whose level is set to a level corresponding to a level of a recording power and a pulse whose level is set to a level corresponding to a level of a bottom power onto a write-once type optical recording medium including a substrate and at least one recording layer formed on the substrate and form at least two recording marks in the at least one recording layer, thereby recording data, the method for recording data in an optical recording medium comprising:
An apparatus for recording data in an optical recording medium constituted so as to project a laser beam onto a write-once type optical recording medium including a substrate and at least one recording layer formed on the substrate and form at least two recording marks in the at least one recording layer, thereby recording data and comprising a laser projecting means for projecting a laser beam whose power is modulated in accordance with a pulse train pattern including at least a pulse whose level is set to a level corresponding to a level of a recording power and pulse whose level is set to a level corresponding to a level of a bottom power onto the optical recording medium, the laser projecting means being adapted for projecting the laser beam whose power is modulated in accordance with a pulse train pattern determined so that a level of a pulse is switched from a level corresponding to the level of the recording power to a level corresponding to the level of the bottom power in accordance with at least one of a length of a first recording mark, a length of a blank region to be formed immediately after formation of the first recording mark and a length of a second recording mark formed subsequent to the formation of the first recording mark onto the optical recording medium, thereby forming the first recording mark in the at least one recording layer.
An optical recording medium comprising a substrate and at least one recording layer and constituted so that at least two recording marks are formed and data are recorded in the at least one recording layer thereof when it is irradiated with a laser beam whose power is modulated in accordance with a pulse train pattern including at least a pulse whose level is set to a level corresponding to a level of a recording power and a pulse whose level is set to a level corresponding to a level of a bottom power, which optical recording medium is further constituted to be recorded with a program for setting recording conditions necessary for determining the pulse train pattern so that a level of a pulse is switched from a level corresponding to the level of the recording power to a level corresponding to the level of the bottom power in accordance with at least one of a length of a first recording mark, a length of a blank region to be formed immediately after formation of the first recording mark and a length of a second recording mark formed subsequent to the formation of the first recording mark.
Dependencies are inferred from the claim text.