Recording apparatus and recording method
AssigneeSony Corporation
InventorsTakashi Sasaki, Munetoshi Moriichi, Mitsuyuki Bamba, Yoshiyasu Masuda
Life of this patent
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Abstract
A recording apparatus generates a first pulse (EQEFM signal) in accordance with recording data such as an EFM signal. A second pulse (first overdrive pulse) to be combined with substantially the leading edge of the first pulse is generated. A third pulse (end overdrive pulse) to be combined with substantially the trailing edge of the first pulse is generated. The first, second, and third pulses are combined to synthesize a driving pulse, and the driving pulse is supplied to a laser unit. At least one of the first, second, and third pulses is controlled so that one of the level and the pulse duration thereof is varied in accordance with the length of formed pits and lands.
Claims14
A recording apparatus, comprising:
- laser means for performing laser beam irradiation with a supplied driving pulse to form a recording data row on a recording medium, said data row being formed of pits and lands, the lands being between the pits and the pits being before and after the lands;
- driving pulse generating means for generating pulses in accordance with recording data, said pulses having a reproducing power level, a first recording power level, and a second recording power level larger than the first recording power level, said second recording power level provided before and after the first recording power level;
- and
- pulse generation control means for controlling at least one of the pulses having the second recording power level generated by said driving pulse generating means so that a pulse width thereof is varied in accordance with a length of at least one of a pit and a land to be formed.
A recording method, comprising:
- generating a laser beam to form a recording data row on a recording medium, said data row being formed of pits and lands, the lands being between the pits and the pits being before and after the lands;
- and
- modulating the laser radiation to have a reproducing power level, a first recording power level, and a second recording power level larger than the first recording power level, said second recording power level provided before and after the first recording power level,
- wherein a width of the second recording power level is controlled so that the width is varied in accordance with a length of at least one of a pit and a land to be formed.
A recording apparatus, comprising:
- a laser supplied with a driving pulse to form a recording data row on a recording medium using laser beam irradiation, said data row being formed of pits and lands, the lands being between the pits and the pits being before and after the lands;
- a laser driver for generating the driving pulse in accordance with recording data, said driving pulse having a producing power level, a first recording power level, and a second recording power level larger than the first recording power level, said second recording power level provided before and after the first recording power level;
- and
- a pulse generation controller for controlling a width of the second recording power level to be generated by said laser driver so that the pulse width thereof is varied in accordance with a length of at least one of a pit and a land to be formed.
Dependencies are inferred from the claim text.