Device and method for recording data to optical disk using recording pulse with corrected edge position

A method for recording data on an optical disc, comprising the steps of forming one mark by irradiating a laser beam, the laser beam being power-controlled according to a recording pulse obtained by synthesizing at least one of a first pulse, a multi-pulse chain which is a repetitive waveform having a Tw cycle and a last pulse, and suitably controlling at least one of a leading edge position of the first pulse and a trailing edge position of the last pulse, thereby recording data with high precision, the leading edge position of the first pulse being defined based on a relative relationship between the leading edge position and a rising phase of the multi-pulse chain, the trailing edge position of the last pulse being defined based on a relative relationship between the trailing edge position and a rising phase of the multi-pulse chain, the method comprising the steps of:

• a) generating a first pulse reference clock having a Tw/n cycle, a last pulse reference clock having a Tw/n cycle, a first pulse reference axis window signal and a last pulse reference axis window signal,
• the first pulse reference clock being obtained by delay-control in a relative time having at least a range of ±Tw/4n (n is natural number) for the rising phase of the multi-pulse chain or a phase with delay by about 180 degrees from the rising phase,
• the last pulse reference clock being delay-controlled within a time range of ±Tw/4n for the rising phase of the multi-pulse chain or the phase with delay by about 180 degrees from the rising phase,
• the first pulse reference axis window signal synchronizing with the rising phase of the multi-pulse chain or the phase with delay by about 180 degrees from the rising phase, being a pulse-shaped signal having at least one cycle width of the first pulse reference clock, and having a start position variable by a time unit of Tw/2n, and
• the last pulse reference axis window signal synchronizing with the rising phase of the multi-pulse chain or the phase with delay by about 180 degrees from the rising phase, being a pulse-shaped signal having at least one cycle width of the last pulse reference clock, and having a start position variable by a time unit of Tw/2n;
• and
• b) determining a leading edge position of the first pulse by timings of the first pulse reference clock and the first pulse reference axis window signal, and determining a trailing edge position of the last pulse by timings of the last pulse reference clock and the last pulse reference axis window signal.

A device for recording data on an optical disc by irradiating laser beams obtained by switching a power value in response to a recording pulse derived by modulated data to be recorded, the device comprising:

• a recording clock generator for generating a recording clock having a Tw/n cycle,
• a clock delay section for generating m (m is a natural number) kinds of delay clocks having different delay amounts by delaying the recording clock;
• a pulse reference signal generator for generating m kinds of pulse reference signals each having at least one cycle width or more of the recording clock, by using the record data and the recording clock;
• a pulse timing signal generator for generating m kinds of pulse timing signals by associating any one of the m kinds of delay clocks with any one of the m kinds of pulse reference signals;
• a delay amount controller for controlling the delay amount of the m kinds of delay clocks;
• and
• a recording pulse synthesizing section for synthesizing the m kinds of pulse timing signals to obtain recording pulses,
• whereby m of predetermined edge positions in the recording pulse are made variable.

A device for recording data on an optical disc by irradiating laser beams obtained by switching a power value in response to a recording pulse derived by modulated data to be recorded, the device comprising:

• a recording clock generator for generating a recording clock having a Tw/n cycle (Tw is one channel bit of the data to be recorded, n is a natural number);
• a clock delay section for generating m (m is a natural number) kinds of delay clocks having different delay amounts by delaying the recording clock;
• a pulse reference signal generator for generating m kinds of pulse reference signals each having at least one cycle width or more of the recording clock, by using the record data and the recording clock, the pulse reference signal being a pulse shaped signal and capable of changing the start position by a time unit of Tw/2n;
• a pulse timing signal generator for generating m kinds of pulse timing signals by associating any one of the m kinds of delay clocks with any one of the m kinds of pulse reference signals;
• a delay amount controller for controlling the delay amount of the m kinds of delay clocks and a timing of the m kinds of pulse reference signals;
• and
• a recording pulse synthesizing section for synthesizing the m kinds of pulse timing signals to obtain recording pulses,
• whereby m of predetermined edge positions in the recording pulse are made variable.