Claims
- 1. A method for forming each mark by irradiating power-controlled laser beams on an optical disc according to a recording pulse made of a plurality of pulse chain and for recording data with high precision by suitably controlling a predetermined edge position of the recording pulse, the method comprising the steps of:
generating a delay clock which is obtained by delaying a recording clock having a Tw/n cycle (Tw is one channel bit of the record data and n is a natural number) used for modulation of record data by a suitably controlled delay amount; and determining the predetermined edge position of the recording pulse by a timing of the delay clock.
- 2. A method for forming each mark by irradiating power-controlled laser beams on an optical disc according to a recording pulse made of a plurality of pulse chain and for recording data with high precision by suitably controlling a predetermined edge position of the recording pulse, the method comprising the steps of:
generating a delay clock which is obtained by delaying a recording clock having a Tw/n cycle (Tw is one channel bit of the record data and n is a natural number) used for modulation of record data by a suitably controlled delay amount and a reference axis window signal which is pulse-shaped signal, the reference axis window signal having a time width of at least Tw/n synchronized with a rising edge of the recording clock or the falling edge, and having a variable start position by a time unit of Tw/2n; and determining a predetermined edge position of a recording pulse by timings of the delay clock and the reference axis window signal.
- 3. The method according to claim 2, wherein, when it is necessary to suitably control the predetermined edge position of the recording pulse within a time range of at least d×Tw/2n (d and n are a natural number), the reference axis window signal is controlled in (d+1) kinds of timings with a time unit of Tw/2n.
- 4. 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.
- 5. 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.
- 6. 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.
- 7. The device according to claim 5, wherein the clock delay section has a plurality of inverter elements having each input and output connected in series and selectors for selecting the output of each of the inverter elements, and the delay amount controller selects one of the outputs of selectors to control delay amount of the delay clock.
- 8. The device according to claim 5, wherein the clock delay section has a plurality of buffer elements having each input and output connected in series and selectors for selecting the output of each of the buffer elements, and the delay amount controller selects one of the outputs of selectors to control delay amount of the delay clock.
- 9. The device according to claim 5, wherein the clock delay section comprises a voltage-controlled delay element, and the delay amount controller controls the control voltage of the voltage-controlled delay element to control delay amount of the delay clock.
- 10. The device according to claim 5, wherein the pulse timing signal generator comprises m D flip-flops, the m kinds of delay clocks is connected to clock input terminals of the m D flip-flops respectively, the m kinds of pulse reference signals is connected to D input terminals of the D flip-flops respectively, thereby m kinds of pulse timing signals is retrieved from Q output terminals of the m D flip-flops.
- 11. The device according to claim 5, further comprising a delay amount measuring section for measuring the delay amount of the clock delay section, whereby the delay amount controller controls the delay amounts of the m kinds of delay clocks based on the result of the measurement of the delay amount which is obtained by the delay amount measuring section.
Priority Claims (2)
Number |
Date |
Country |
Kind |
10-306760 |
Oct 1998 |
JP |
|
11-014468 |
Jan 1999 |
JP |
|
Parent Case Info
[0001] This is a Divisional Application of U.S. application Ser. No. 09/427,544, filed Oct. 27, 1999.
Divisions (1)
|
Number |
Date |
Country |
Parent |
09427544 |
Oct 1999 |
US |
Child |
10787592 |
Feb 2004 |
US |