WO2005109408A1 - 光記録方法及び光記録装置 - Google Patents
光記録方法及び光記録装置 Download PDFInfo
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- WO2005109408A1 WO2005109408A1 PCT/JP2005/007876 JP2005007876W WO2005109408A1 WO 2005109408 A1 WO2005109408 A1 WO 2005109408A1 JP 2005007876 W JP2005007876 W JP 2005007876W WO 2005109408 A1 WO2005109408 A1 WO 2005109408A1
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- recording
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- recommended
- write strategy
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
- G11B7/0045—Recording
- G11B7/00456—Recording strategies, e.g. pulse sequences
Definitions
- the present invention relates to an optical recording method and an optical recording apparatus for recording information on an optical recording medium, and more particularly to a method for determining a write strategy used at the time of recording.
- a recording / reproducing section having a strategy section for controlling a write strategy at the time of writing to an optical disc, and a strategy information recording section for recording strategy information for operating the strategy section
- the strategy information recording unit records the device information of the recording device and the strategy information corresponding to the medium information of the optical disc, and reads out the strategy information corresponding to the device information and the medium information from the strategy information recording unit and records it together with the medium information.
- the apparatus further records the standard strategy information to the scan Torateji recording unit, if the strategy information force s strategy information recording unit corresponding to the transfer from the recorder apparatus information Contact and medium information not recorded standard strategy
- the information is read and transferred to the recording device (for example,
- Patent Document 1 Japanese Patent Application Laid-Open No. 2002-56531 (Fig. 1-9, Fig. 1-15)
- a second object is to obtain an optical recording method and an optical recording apparatus that can perform optimal recording even on an optical disk for which optimal strategy information is not known in advance. Means for solving the problem
- the present invention provides a reading step of reading the recommended write strategy value from a dye-based optical recording medium on which a multi-pulse type write strategy recommended value is recorded, and a shortest mark included in the read write strategy recommended value.
- a reading step of reading the recommended write strategy value from a dye-based optical recording medium on which a multi-pulse type write strategy recommended value is recorded and a shortest mark included in the read write strategy recommended value.
- the present invention provides an optical recording method including: a step of determining a pulse width of a write strategy of the above; and a writing step of writing to the optical recording medium by the optical recording device using the determined write strategy.
- an appropriate write strategy is determined for a recommended write strategy value recorded on an optical recording medium in accordance with the characteristics of an optical system of an optical pickup of an optical recording apparatus used for recording. Recording can be performed using an optimal write strategy.
- FIG. 1 is a block diagram showing an optical recording device according to Embodiment 1 of the present invention.
- FIG. 2 is a diagram illustrating an example of asymmetry of a reproduced signal detected by an asymmetry detection unit according to Embodiment 1 of the present invention.
- FIG. 3 is a diagram showing an example of a write strategy generated when the optical disc is a dye-based medium in the optical recording device according to the first embodiment of the present invention.
- Fig. 4 is a flowchart showing a recording procedure in the optical recording apparatus according to the first embodiment of the present invention.
- FIG. 5 is a flowchart for calculating a recommended write power of a write strategy recorded on an optical disc in the optical recording apparatus according to the first embodiment of the present invention.
- FIG. 6 is a diagram illustrating a relationship between a recommended write strategy value 2TP and a pulse width 2TF in the optical recording device according to the first embodiment of the present invention.
- FIG. 7 is a diagram showing a relationship between a recommended write strategy value LTP and a pulse width LTF in the optical recording device according to the first embodiment of the present invention.
- FIG. 8 is a diagram showing a relationship between pulse widths 2TF and 1TF of a write strategy in the optical recording device according to the first embodiment of the present invention.
- FIG. 9 is a diagram showing a relationship between a pulse width LTF of a write strategy and 3TF in the optical recording device according to the first embodiment of the present invention.
- FIG. 10 is a diagram showing a relationship between a recommended write strategy value of TMP X 2TP X LTP / 1TP and a pulse width TM in the optical recording device according to the first embodiment of the present invention.
- FIG. 11 is a diagram showing a relationship between a recommended asymmetry value ⁇ 1 recorded on the optical disc and an asymmetry value j82 used for recording according to the first embodiment of the present invention.
- FIG. 12 is a diagram illustrating a relationship between a write strategy used for recording and a jitter value in the optical recording apparatus according to the first embodiment of the present invention.
- FIG. 13 is a block diagram showing an optical recording device according to Embodiment 1 of the present invention.
- FIG. 14 is a diagram illustrating an example of a modulation factor of a reproduced signal detected by the modulation factor detection unit according to the first embodiment of the present invention.
- FIG. 15 is a diagram showing an example of a write strategy generated when the optical disc is a phase-change medium in the optical recording devices according to Embodiments 2 and 3 of the present invention.
- FIG. 16 is a flowchart showing a recording procedure in the optical recording device according to Embodiments 2 and 3 of the present invention.
- FIG. 17 is a diagram showing a relationship between PW1 ⁇ ⁇ P1XTMP1 of the recommended recording condition recorded on the optical disc and the power ratio ⁇ 1 in the optical recording apparatus according to Embodiment 2 of the present invention.
- FIG. 18 is a diagram showing a relationship between a recommended write strategy value of TMP 1 X TCP 1 / 1TP1 and a modulation factor MOD 1 used for recording in the optical recording apparatus according to Embodiment 2 of the present invention.
- FIG. 19 is a diagram showing a relationship between a power ratio used for recording and a jitter value in an optical recording apparatus according to Embodiment 2 of the present invention.
- FIG. 20 is a diagram showing a relationship between (PW2 ′′ 2 ⁇ ⁇ 2) ⁇ 1 ⁇ 1 of the recommended recording condition recorded on the optical disc and the power ratio ⁇ 2 in the optical recording apparatus according to Embodiment 3 of the present invention.
- FIG. 21 is a diagram showing a relationship between a recommended recording condition value 1TP2 X PW2 recorded on an optical disc and a modulation factor MOD2 used for recording in the optical recording device according to Embodiment 3 of the present invention.
- FIG. 22 is a diagram showing a relationship between a power ratio used for recording and a jitter value in an optical recording apparatus according to Embodiment 3 of the present invention.
- 100 optical recording device 110 semiconductor laser, 120 laser driving unit, 130 collimating lens, 140 beam splitter, 150 objective lens, 160 optical disk, 170 detection lens, 180 light receiving element, 190 head amplifier, 200 data decoder, 21 0 Pre-pit detector, 220 asymmetry detector, 230 data encoder, 240 laser waveform controller 250 central controller, 260 modulation degree detector.
- a recording method and a recording apparatus of the present invention perform recording on an optical disc on which a recommended write strategy value or a recommended recording condition value is recorded in advance.
- the recommended value of the write strategy or the recommended value of the recording condition indicates a write strategy or a recording condition suitable for recording on the optical disc, and is, for example, a predetermined area of the optical disc in the form of a prepit, for example, a read. Recorded in the IN area.
- an optical disc is composed of a group portion (not shown) that also has a groove force for recording information and a land portion (not shown) between the grooves, and a write strategy recommended value (this is set by a recording medium manufacturer). Includes the recommended recording power) but the recommended asymmetry value It is recorded on the land together with the recording conditions.
- the recommended write strategy value is assumed to be recorded under predetermined conditions. Therefore
- a write strategy is determined based on a recommended write strategy value or a recommended recording condition value from which an optical disc force is also read, and a characteristic of an optical system of an optical pickup of an optical recording apparatus used for recording. Record using
- the optical recording method performs mark edge recording (PWM recording). Then, based on the data to be recorded on the optical disk, the semiconductor laser emits multi-pulses to form recording marks, thereby recording information. That is, the write strategy used in the following embodiment is a multi-pulse type, and has one or more pulses during a mark period. In such a multi-pulse write strategy, in the embodiment described below, the pulse width is changed according to the characteristics of the optical system of the optical pickup of the optical recording apparatus.
- the recording of information on the optical disc is performed by irradiating the optical disc with an optical pulse having a pattern corresponding to the marks of 3T to 11T and 14T (T is a channel clock cycle) of the EFM modulation.
- T is a channel clock cycle
- the longest mark (mark having a length of 14T) is a sync pattern.
- FIG. 1 is a diagram showing a basic configuration example of an optical recording device 100 according to Embodiment 1 of the present invention.
- the driving of a semiconductor laser 110 as a laser light source is controlled by a laser driving unit 120.
- a laser beam emitted from the semiconductor laser 110 and having an output value (reproduction power) required for data reproduction is transmitted through the collimator lens 130, the beam splitter 140, and the objective lens 150 to the optical disk.
- the light is condensed and irradiated to 160.
- the reflected light from the optical disk 160 passes through the objective lens 150, is separated from the incident light by the beam splitter 140, and is received by the light receiving element 180 via the detection lens 170.
- the semiconductor laser 110, the collimating lens 130, the beam splitter 140, the objective lens 150 and the detection lens 170 form an optical system
- the optical system and the light receiving element 180 form an optical pickup! RU
- the light receiving element 180 converts an optical signal into an electric signal.
- the electric signal converted by the light receiving element 180 is input to the data decoder 200, the pre-pit detection unit 210, and the asymmetry detection unit 220 via the head amplifier 190.
- the data decoder 200 generates (reproduces) data recorded on the optical disc 160 by performing processing such as demodulation and error correction on the input electric signal.
- the pre-pit detection unit 210 detects pre-pit information including information such as a recommended write strategy value, which is a recommended value of a write strategy to be recorded on the optical disc 160, from the input electric signal.
- the asymmetry detection unit 220 performs AC (AC) coupling of the input electric signal, and detects a peak level A1 and a bottom level A2 of the AC-coupled electric signal. From the detected peak level A1 and bottom level A2, calculate the asymmetry value j8 using the following equation (1).
- Peter Alley and Alley Bottom 2 occur at the part where the longest space and the longest mark appear alternately, and their values are the peak level of the part where the shortest space and the shortest mark appear alternately.
- the average value at the bottom level is expressed as zero level.
- FIG. 2 shows an example of detection of asymmetry of a reproduced signal detected by the asymmetry detection section 220.
- Figure 2 (a) shows the case where ⁇ is zero.
- Figure 2 (c) shows the case where
- the data encoder 230 applies an error correction code to the original data to be recorded, modulates the data, and converts the recording data that is the basis of the drive signal to the semiconductor laser 110 into data. Generate.
- the laser waveform control section 240 generates a write strategy signal based on the recording data. That is, when recording data designating any of 3 ⁇ to 11T and 14T is given from the central control unit 250, the laser waveform control unit 240 A write strategy signal (a signal having a waveform substantially the same as the waveform of the light emission pulse train) corresponding to various recording data is output.
- the laser driving unit 120 drives the semiconductor laser 110 with a driving current according to the generated write strategy signal.
- Laser light emitted from the semiconductor laser 110 and having an output value (recording power) necessary for data recording is focused and irradiated on the optical disk 160 via the collimator lens 130, the beam splitter 140, and the objective lens 150. As a result, information is recorded.
- FIG. 3 shows an example of a write strategy generated by the laser waveform control section 240 when the optical disc 160 is a dye-based recording medium in the optical recording apparatus 100 shown in FIG. .
- FIG. 3A shows a channel clock having a period T.
- Fig. 3 (b) shows recorded data consisting of marks and spaces.
- FIG. 3 (c) shows a light emission pulse pattern of a write strategy for recording the recording data of FIG. 3 (b).
- the level of the light emission pulse pattern changes between a recording power level and a reproduction power level, and a period in the recording power level is defined as a width of each pulse.
- the shortest mark has a length corresponding to 3T, and the longest mark has a length corresponding to 14T.
- Figures 3 (b) and 3 (c) assume that the shortest mark is recorded, and then the fourth shortest mark is recorded.
- the write strategy when the recording data is the shortest mark consists of only the first pulse F having a pulse width of 1TF.
- a write strategy for recording a mark having the fourth shortest recording data includes a leading pulse F having a pulse width of LTF, and three subsequent multi-pulses M.
- the write strategy consists of the first pulse F having the LTF pulse width and the Followed by (n-1) multipulses M.
- the write strategy is to use a head pulse F having a pulse width of LTF and the following 11 multi-paths. Luss M.
- the width of the first pulse is LTF in each case and is the same as each other.
- the write strategy for recording the second shortest mark in the recording data consists of a leading pulse F having a pulse width of 2TF, followed by one multipulse M.
- the write strategy for recording the third shortest mark in the recording data consists of a head pulse F having a pulse width of 3TF, followed by two multi-pulses M.
- the width of the multipulse M is the same.
- the central control unit 250 controls the whole of the optical recording device 100 when reproducing and writing data.
- the central control unit 250 reproduces data from the data decoder 200, pre-pit information from the pre-pit detection unit 210, and asymmetry. While receiving the asymmetry value from the detection unit 220, it supplies control signals to the data encoder 230, laser waveform control unit 240, and laser drive unit 120.
- the central controller 250 particularly determines the write strategy, which will be described later with reference to FIGS. 4 and 5, in particular the calculation of its pulse width and power ratio, the calculation of the asymmetry value, the modified light strategy and the asymmetry value. The control of the test writing performed using is performed.
- the central control unit 250 includes, for example, a CPU, a program memory configured to store a program for operating the CPU, for example, a ROM, and a data memory configured to store data, such as a RAM. Have.
- the program memory stores constants (Ki, Ci, etc.) for various calculations described later.
- the program stored in the program memory includes a part defining a calculation formula for determining a write strategy and a calculation formula for determining a recording condition, which will be described later with reference to FIGS. 4 and 5. .
- the recording power is optimized by performing trial writing before recording information.
- this procedure will be described.
- a test write to the optical disc 160 is performed by changing the recording power using a test pattern composed of 3T to 11T marks and spaces corresponding to random recording data, for example.
- the area on the optical disk 160 on which is recorded is reproduced, the asymmetry value is detected by the asymmetry detection unit 220, and the detected asymmetry value is centrally controlled.
- the control unit 250 the optimum recording power is obtained by comparing with the target asymmetry value. Generally, as the recording power increases, the asymmetry value increases, and as the recording power decreases, the asymmetry value decreases.
- the central control unit 250 compares detected values of asymmetry values corresponding to a plurality of recording powers different from each other with a target value, and determines a recording power that is closest to the target value and caused the detected value to be an optimum recording power. .
- a test write to the optical disk 160 is performed with one recording power, and then the optical disk 160 is played back.
- the reproduced result is detected.
- the asymmetry value is detected, and the detected asymmetry value is compared with the target asymmetry value. Then, the recording power may be increased or decreased according to the comparison result to obtain the optimum value.
- the recording conditions such as the pulse width of the write strategy and the target value at the time of the optimum power adjustment at the time of performing recording are determined by the optical disc. Based on the recommended values of the write strategy and the recommended recording conditions recorded in step 160, and the characteristics of the optical system of the optical pickup of the optical recording device used for recording, Recording is performed using the set pulse width and recording conditions.
- the recommended write strategy value includes the recommended pulse width of the first pulse of the write strategy for recording each mark.
- the recommended value of this leading pulse width iTP is at least
- the recommended pulse width 1TP for the first pulse F when the recording data is the shortest mark is read.
- the recommended pulse width 2TP for the first pulse F when the recording data is the second shortest mark is read.
- the recommended asymmetry value i is a target value for determining the recording power in test writing.
- step S12 a write strategy to be used for recording is determined based on the read recommended write strategy value and characteristics of the optical system of the optical pickup of the optical recording apparatus used for recording. (Step S12). The details will be described later.
- step S13 the numerical aperture NA1 used for determining the recommended write strategy value and the recommended asymmetry value j81 read in step S11 as described above, and the optical recording used for recording. Based on the numerical aperture NA2 of the objective lens 150 of the apparatus 100, an asymmetry value j82 to be used for recording is obtained by the following equation (2) (step S13).
- the numerical aperture NA1 is known, and data representing the numerical aperture NA1 is stored in advance in, for example, a non-volatile memory (for example, a ROM) in the central control unit 250. Further, data representing the numerical aperture NA2 of the objective lens 150 and the constant E are also stored in the non-volatile memory in the central control unit 250, and are read out and used in the calculation of the equation (2).
- a non-volatile memory for example, a ROM
- data representing the numerical aperture NA2 of the objective lens 150 and the constant E are also stored in the non-volatile memory in the central control unit 250, and are read out and used in the calculation of the equation (2).
- step S14 test writing is performed on the optical recording medium using the write strategy and the asymmetry value obtained as described above. That is, by setting the write strategy determined in step S12 in the laser waveform control unit 240, the laser waveform control unit 240 generates a write strategy based on the test pattern, and performs test writing on the optical disc 160.
- the asymmetry value j82 obtained as described above is used as the target value. That is, the area on the optical disk 160 on which the test pattern is recorded is reproduced, and the asymmetry value detected by the asymmetry detection unit 220 is compared with the asymmetry value j82 calculated in step S13, so that the two coincide.
- the optimal recording power is determined by performing control so that
- step S15 data recording is performed using the adjusted recording power and the write strategy obtained in step S12. That is, by setting the write strategy determined in step S12 in the laser waveform control unit 240, a write strategy based on the recording data is generated in the laser waveform control unit 240, and the recording power determined in step 14 is used. To optical disk 160 Is written.
- the central control unit 250 specifies any of 3T to 11T and 14T, and The written write strategy signal is output from the laser waveform control unit 240.
- FIG. 5 shows the details of the process for determining step 12 in FIG.
- the recorded data is calculated from the recommended pulse width 2TP obtained at step SI1 and the coefficients K2 and C2 using the following equation (3). Calculate the pulse width 2TF of the first pulse F for short marks.
- step SI22 from the recommended pulse width LTP obtained in step S11 and the coefficients KL and CL, the following equation (4) is used to determine the recording data from the fourth shortest mark to the longest mark. Calculate the pulse width LTF of the first pulse F in this case.
- step S123 the value of the pulse width 2TF calculated in step S121 is set to the pulse width 1TF of the first pulse F when the recording data is the shortest mark.
- the value of the pulse width LTF calculated in step S122 is set to the pulse width 3TF of the first pulse F when the recording data is the third shortest mark.
- step S124 using the following formula (5) from the recommended pulse widths 1TP, 2TP, LTP, and TMP obtained in step S11 and the constant KM and the constant CM, Calculate the width TM.
- TM KM X (TMP X 2TP X LTP / ITP) + CM '(5)
- the data representing the constants K2, KL, KM, C2, CL, and CM used in steps S121 to S124 are stored in the non-volatile memory in the central control unit 250. (3) to (4), and used for calculation of equation (5).
- step S12 the head pulse of the write strategy used for recording and the multi-pulse are determined based on the recommended pulse width of the write strategy and the pulse width of the multi-pulse.
- the pulse width is determined. In other words, light Instead of using the recommended value of the strategy as it is, the recommended value of the write strategy is corrected. The reasons are as follows.
- the write strategy recommendation value and the recommended asymmetry value are recorded on the optical disc in a predetermined area.
- the objective lens 150 under the recording conditions when the write strategy recommendation value is recorded on the optical disc 160 is recorded.
- NA1 is different from the numerical aperture NA2 of the objective lens 150 of the optical recording device 100 used for recording
- the power is determined using the recorded recommended write strategy value and the asymmetry value
- the amount of heat applied to the optical disk 160 and the distribution thereof differ depending on the difference in the numerical aperture. For this reason, the size and shape of the pits formed for each mark length are different from the optimal state, and the jitter deteriorates. Therefore, in order to compensate for the difference in recording conditions, especially the difference in numerical aperture, the write strategy is modified or optimized.
- step S13 the asymmetry value j82 used for recording is obtained by calculation based on the recommended asymmetry value ⁇ 1 from which the optical disk power has also been read. In other words, the asymmetry value j81 recorded on the optical disk is used after being corrected.
- the reasons are as follows.
- NAKNA2 when NAKNA2 is used, that is, when the numerical aperture NA2 of the objective lens 150 of the optical recording device 100 used for recording is the numerical aperture of the objective lens under the recording conditions when the recommended asymmetry value is recorded on the optical disc 160.
- NA1 when the numerical value is larger than NA1, the asymmetry value detected by the objective lens having the numerical aperture NA2 is larger than the asymmetry value detected by the objective lens having the numerical aperture NA1.
- the optimal value 1TF of the head pulse width of the write strategy for recording the shortest mark is equal to the optimal value 2TF of the head pulse width of the write strategy for recording the second shortest mark
- Optimum value of the first pulse width of the write strategy for recording the third shortest mark 3TF and optimal value of the first pulse width of the write strategy for recording the longest mark for the fourth shortest mark force LTF is equal to U ⁇ ⁇ ⁇ I also found out.
- the pulse width 2TF of the first pulse of the obtained write strategy is indicated by a straight line. As shown in the figure, it can be confirmed that the distance (approximation error) from the approximate straight line of the optimum value is small.
- the pulse width LTF of the first pulse of the obtained write strategy is shown by a straight line. As shown in the figure, it can be confirmed that the distance (approximation error) of the optimum value from the approximation line is small.
- the pulse width TM of the multi-pulse of the light strategy obtained is shown by a straight line. As shown in the figure, it can be confirmed that the distance (approximation error) of the optimum value from the approximate straight line is small.
- the optimal asymmetry value is affected by the numerical aperture of the optical recording device used for recording.
- the numerical aperture of the optical recording device depends on the numerical aperture of the recording conditions used when determining the recommended write strategy value. If it is different from the numerical value, it is desirable to consider the numerical aperture when determining the asymmetry value used for recording.
- the asymmetry value j82 used for recording is obtained by adding the correction amount determined based on the difference in numerical aperture to the recommended asymmetry value j81. Specifically, the use of equation (2) above was appropriate.
- Equation (2) is used in step S13 in FIG. 4 for that reason.
- Fig. 11 shows, for a plurality of optical disks having different recommended asymmetry values j81, values of asymmetry value / 32 that minimize the reproduction jitter in a specific optical recording device 100, with ⁇ marks.
- 82 obtained when E l.0 in equation (2) is indicated by a straight line.
- the asymmetry value (minimum reproduction jitter) can be obtained.
- the ability to linearly approximate the optimal asymmetry value) was an important factor.
- FIG. 12 shows the reproduction jitter when recording was performed using three types of pulse patterns on nine types of optical disks A to I, respectively.
- an X mark indicates a reproduction jitter when recording is performed using the recommended write strategy value recorded on each optical disc.
- the mark “ ⁇ ” indicates the reproduction jitter when recording is performed using the optimum write strategy adjusted so as to obtain the optimum reproduction jitter for each optical disc.
- the symbol ⁇ indicates the reproduction jitter when recording was performed using the write strategy corrected using the above-described equations (3), (4), and (5).
- recording can be performed using the optimum write strategy symmetry value according to the characteristics of the optical system of the optical pickup of the optical recording apparatus.
- the optical system conditions such as the numerical aperture when determining the recommended value generally recorded on the optical recording medium are different from the optical conditions of a commercially available optical recording device.
- a write strategy symmetry value suitable for each optical recording device is obtained.
- recording can be performed with a write strategy suitable for each optical recording device.
- the write strategy asymmetry value is experimentally determined.
- the determination of the constant may be performed only once for each type or specification of optical recording device, and the same constant can be used for many optical recording devices of the same type or specification. That is, when a constant is obtained for an optical recording device of a certain type or specification, the obtained constant may be set in an optical recording device of the same type or specification and shipped.
- the recommended write strategy value and the recommended asymmetry value recorded on the optical disc 160 are calculated by the following equations (3), (4), and (5). Since the calculation is performed using the information, it is possible to perform recording corresponding to any recording device and recording medium that does not need to hold a lot of strategy information.
- recording is better than the case where the recommended write strategy value and the asymmetry value are used as they are, and recording can be performed as well as the case where the optimum recommended write strategy value is used for each optical disc. Therefore, good recording can be performed even on an optical disk for which the optimal write strategy information does not have a sufficient component in advance.
- the pulse width 1TF of the first pulse F when the recording data is the shortest mark is equal to the pulse width of the first pulse F when the recording data is the second shortest mark.
- the pulse width 3 TF of the first pulse F when the recording data is the third shortest mark is equal to the pulse width LF of the first pulse F when the recording data is the shortest mark.
- the pulse width of the first pulse F may be different from each other.
- the optical disk 160 is a dye-based recording medium.
- the following describes a case where the optical disk 160 is a phase-change type recording medium, and the recording speed is further reduced to the standard.
- the case of fast recording will be described.
- FIG. 13 is a diagram showing a basic configuration example of the optical recording device 100 according to Embodiment 2 of the present invention.
- the optical recording device 100 shown in FIG. 13 is generally the same as the optical recording device of FIG. However, the asymmetry detecting section 220 of the optical recording apparatus of FIG. 1 is not provided, and a modulation degree detecting section 260 is provided instead.
- the central control unit 250 receives the value of the modulation factor from the modulation factor detector 260 (instead of receiving the asymmetry value from the asymmetry detector 220 as in the first embodiment) and modulates the modulation value instead of calculating the asymmetry value.
- the calculation of the degree is performed, and instead of the modified write strategy and asymmetry value, the control of test writing performed using the modified write strategy and the modified modulation degree is performed.
- Modulation degree detection section 260 detects peak level B1 and bottom level B2 of the input electric signal. From the detected peak level B1 and bottom level B2, the modulation factor MOD is calculated using the following equation (6).
- the peak level Bl and the bottom level B2 are generated in a portion where the longest space and the longest mark appear alternately, and their values are the output of the light receiving element 180 when there is no light incident on the light receiving element 180.
- the level is represented as zero level.
- FIG. 14 shows an example of detection of the modulation degree of the reproduced signal detected by modulation degree detection section 260.
- Fig. 14 (a) shows the case where the degree of modulation is small.
- Figure 14 (b) shows the case where the modulation degree is large.
- FIG. 15 shows an example of a write strategy generated by the laser waveform control unit 240 when the optical disk 160 is a phase-change type recording medium in the optical recording device 100 shown in FIG. is there.
- FIG. 15A shows a channel clock having a period T.
- Fig. 15 (b) shows marks, spaces, and useful recorded data.
- Fig. 15 (c) shows the recorded data of Fig. 15 (b).
- 5 shows a light emission pulse pattern of a write strategy for recording the data. The level of the light emission pulse pattern changes between the recording power, the erasing power, and the reproducing power, and a period at the recording power level and a period at the reproducing power level are defined as the width of each pulse.
- the shortest mark has a length corresponding to 3T, and the longest mark has a length corresponding to 14T.
- FIGS. 15 (b) and 15 (c) assume that the shortest mark is recorded, and then the fourth shortest mark is recorded.
- the write strategy is a head pulse F having a pulse width of 1TF, one subsequent multi-pulse M, and a subsequent reproduction power. Consists of one cooling pulse C at the level of
- the write strategy for recording the fourth shortest mark in the recording data consists of the first pulse F having a pulse width of LTF, the following four multi-pulses M, and the It consists of one cooling pulse C at the following reproduction power level.
- the recording data records the nth (4 ⁇ n ⁇ 10) short mark and the mark (having a length corresponding to (n + 2) T)
- the write strategy consists of the first pulse F having the LTF pulse width and the Followed by n multi-pulses M, followed by one cooling pulse C at the playback power level.
- the write strategy consists of the first pulse F having the pulse width of LTF, the following three multipulses M, and It consists of one cooling pulse at the following playback power level.
- the write strategy is to have a head pulse F having a pulse width of LTF, the following 12 multi-pulses M, and the subsequent reproduction power. It consists of one cooling pulse C at the level.
- the width of the first pulse is LTF in any case and is the same as each other.
- the write strategy for recording the second shortest mark in the recording data is a head pulse F having a pulse width of 2TF, followed by two multi-pulses M, and a subsequent playback pulse. It consists of one cooling pulse C at the lower level.
- the width of the multipulse M is the same.
- the width of the cooling pulse C is the same regardless of the mark to be recorded.
- the recording power is optimized by performing test writing before recording information.
- this procedure will be described.
- a test write to the optical disc 160 is performed by changing the recording power using a test pattern consisting of 3T to 11T marks and spaces corresponding to random recording data, and then this test pattern The area on the optical disk 160 on which is recorded is reproduced, and the modulation degree detector 260 obtains the optimum recording power by comparing with the target value of the modulation degree.
- the value of the modulation is increased, and as the recording power is decreased, the value of the modulation is decreased.
- the central control unit 250 compares the detected values of the modulation factors corresponding to a plurality of recording powers different from each other with the target value, and determines the recording power closest to the target value and which caused the detected value as the optimum recording power.
- a test write is performed on the optical disc 160 with one recording power, and then the optical disc 160 is reproduced, and the reproduction result is detected.
- the modulation value is detected, and the detected modulation value is set as a target.
- the optimum value may be obtained by increasing or decreasing the recording power in accordance with the result of comparison with the value of the modulation factor.
- the power ratio of the write strategy at the time of recording and the recording condition of the target value at the time of the optimal power adjustment are defined by the optical disc. Based on the recommended values of the write strategy and the recommended recording conditions recorded in 160, and the characteristics of the optical system of the optical pickup of the optical recording device used for recording, the values are calculated and calculated. Recording is performed using the power ratio and the target value at the time of power adjustment.
- step S21 When the optical disk used for recording is first inserted into the optical recording device, the process proceeds to step S21.
- the recommended write strategy value includes the recommended pulse width of the first pulse of the write strategy for recording each mark.
- the recommended value iTP of the leading pulse width at least the recommended pulse width 1TP of the leading pulse F when the recording data is the shortest mark is read.
- step S22 based on the recommended value of the write strategy read in step S21 as described above, the value ⁇ 1 of the power ratio to be used for recording is calculated by the following equation (7).
- ⁇ 1 KE1 X (PW1 X ⁇ PI XTMPl) + CE1 (7)
- the data representing the constants KE1 and CE1 are stored in the non-volatile memory in the central control unit 250, and are read out and used in the calculation of the equation (7).
- step S23 based on the recommended value of the write strategy read in step S21 as described above, a modulation degree value MODI to be used for recording is calculated by the following equation (8) ( Step S23).
- the data representing the constants KMOD 1 and CMOD 1 are stored in the non-volatile memory in the central control unit 250, and are read out and used in the calculation of the equation (8).
- step S 24 a test write to the optical recording medium is performed using the power ratio and the modulation degree obtained as described above. That is, by setting the power ratio determined in step S22 in the laser waveform control unit 240, the laser waveform control unit 240 generates a write strategy based on the test pattern, and performs test writing on the optical disc 160. .
- the value of the modulation degree MODI obtained as described above is used as the target value. That is, the area on the optical disk 160 on which the test pattern is recorded is reproduced, and the value of the modulation degree detected by the modulation In this case, the optimum recording power is determined by comparing with the modulation degree value MOD 1 calculated in the above and controlling the two so that they match.
- step S25 data recording is performed using the adjusted recording power and the power ratio obtained in step S22. That is, by setting the power ratio determined in step S22 in the laser waveform control unit 240, the laser waveform control unit 240 generates a write strategy based on the recording data, and determines the recording power determined in step S24. Thus, writing to the optical disk 160 is performed.
- step S22 the value of the power ratio used for recording is determined based on the recommended pulse width, the recommended recording power, and the recommended power ratio of the write strategy from which the optical disc power has also been read. ing. In other words, the recommended power ratio is modified without using the recommended power ratio. The reason is as follows.
- the recommended value of the power ratio and the like are recorded in a predetermined area on the optical disc, but the numerical aperture of the objective lens 150 under the recording conditions when the recommended value of the power ratio is recorded on the optical disc 160
- NA1 is different from the numerical aperture NA2 of the objective lens 150 of the optical recording device 100 used for recording
- the difference in the numerical aperture causes The amount of heat applied to the optical disk 160 is different.
- the size and shape of the pits formed for each mark length are different from the optimal state, and jitter is worsened. Therefore, in order to compensate for the difference in the recording conditions, especially the difference in the numerical aperture, the power ratio is corrected or optimized.
- the present inventors have set a condition under which the reproduction jitter is minimized when the recording condition of the optical recording device used for recording is different from the recording condition used in determining the recommended write strategy value. The required experiment was performed.
- FIG. 17 shows the value of the power ratio ⁇ 1 at which the reproduction jitter is minimized in the specific optical recording device 100 for a plurality of optical discs having different values of the recommended power ratio ⁇ PI from each other.
- the power ratio value (optimal power ratio value) at which the reproduction jitter was minimized could be linearly approximated by using the equation (7).
- the recommended value of the modulation degree is recorded on the optical disk 160. Therefore, it is necessary to estimate the value of the recommended pulse width.
- FIG. 19 shows the reproduction jitter when recording was performed using three types of power ratios in six types of optical disks A to F.
- an X mark indicates a reproduction jitter when recording is performed using the recommended power ratio value recorded on each optical disc.
- the mark “ ⁇ ” indicates the reproduction jitter when recording is performed using the optimum power ratio adjusted so as to obtain the optimum reproduction jitter for each optical disc.
- a mark “ ⁇ ” indicates a reproduction jitter when recording is performed using the power ratio corrected using the above-described equation (7).
- the recording was performed using the corrected power ratio recommended value recorded on each optical disk (X). And good reproduction jitter could be obtained. Also, when recording using the corrected power ratio recommended value ( ⁇ ), almost as good reproduction jitter can be obtained as when recording using the optimal power ratio ( ⁇ ). Was.
- recording can be performed using the optimum power ratio and modulation value in accordance with the characteristics of the optical system of the optical pickup of the optical recording apparatus.
- the optical system conditions such as the numerical aperture and the wavelength when determining the recommended values generally recorded on an optical recording medium are different from the optical conditions of a commercially available optical recording device.
- Power Considering the difference between the specifications of the optical system of a commercially available optical recording device, especially its optical pickup, and the specifications of the optical system when the recommended values are determined, the power ratio and modulation degree suitable for each optical recording device Can be obtained, and recording can be performed under recording conditions suitable for each optical recording apparatus.
- the power ratio and the degree of modulation are experimentally determined.
- Obtain the constants (KE1, CE1, KMODl, CMOD1) of the calculation formula to be used store them in the optical recording device, for example, in the nonvolatile memory of the central control unit, and use these constants when recording. By reading and using these, it is possible to easily calculate the power ratio and the modulation factor suitable for each recording device.
- the determination of the constant may be performed only once for each type or specification of optical recording device, and the same constant can be used for many optical recording devices of the same type or specification. That is, when a constant is obtained for an optical recording device of a certain type or specification, the obtained constant may be set for an optical recording device of the same type or specification and shipped.
- the optimum recording conditions can be optimized by again selecting or determining the constants (K El, CE1, KMODl, CMOD1) in equations (7) and (8). Can be easily performed.
- the values of the power ratio and modulation used for recording are set to the recommended pulse width of the recommended write strategy value recorded on the optical disc 160 and the recommended power ratio. Value, recommended recording power value, and calculated using equations (7) and (8). It is possible to perform recording corresponding to any recording device and recording medium that does not need to hold the above strategy information.
- the force using the recommended leading pulse width of the strategy pulse for recording the shortest mark is the force of the strategy pulse for recording the second shortest mark.
- the recommended start pulse width or the recommended start pulse width of the strategy pulse for recording the third longest mark force may be used instead.
- the optical disk 160 is a phase-change recording medium and the recording speed is a standard speed recording is described.
- the recording speed is double speed recording will be described.
- the write strategy used for the standard speed recording and the recording is the same as the write strategy shown in FIG.
- the write strategy power ratio at the time of recording and the recording condition of the target value at the time of the optimum power adjustment are changed to the recommended write strategy value and the recording condition recorded on the optical disc 160.
- calculation is performed, and recording is performed using the obtained power ratio and the target value at the time of power adjustment.
- the optical recording device used in the present embodiment is the same as that shown in FIG.
- step S21 When an optical disk used for recording is first inserted into the optical recording device, in step S21, a write strategy recommended value for performing double speed recording from the optical recording medium, that is, a write strategy for recording each mark.
- recommended power ratio ⁇ ⁇ 2 erasing power ⁇ recording power
- ⁇ ⁇ ⁇ ⁇ Read one recommended value PW2 Step S21.
- the recommended write strategy value includes the recommended pulse width of the first pulse of the write strategy for recording each mark.
- the recommended value of the leading pulse width iTP2 at least the recommended pulse width 1TP2 of the leading pulse F when the recording data is the shortest mark is read.
- step S22 based on the recommended value of the write strategy read in step S22 as described above, the value ⁇ 2 of the power ratio to be used for recording is calculated by the following equation (9). (Step S22)
- the data representing the constants ⁇ 2 and CE2 are stored in the non-volatile memory in the central control unit 250, and are read out and used for the calculation of the equation (9).
- step S23 based on the recommended value of the write strategy read in step S21 as described above, a modulation degree value MOD2 to be used for recording is obtained by the following equation (10) (step S23) ).
- the data representing the constants KMOD2, KMOD3, and CMOD2 are stored in the non-volatile memory in the central control unit 250, and are read out and used in the calculation of the equation (10).
- step S 24 a test write to the optical recording medium is performed using the power ratio and the modulation factor obtained as described above. That is, by setting the power ratio determined in step S22 in the laser waveform control unit 240, the laser waveform control unit 240 generates a write strategy based on the test pattern, and performs test writing on the optical disc 160. .
- the value MOD2 of the modulation factor obtained as described above is used as the target value. That is, the area on the optical disk 160 on which the test pattern has been recorded is reproduced, and the modulation degree value detected by the modulation degree detection unit 260 is compared with the modulation degree value MOD2 calculated in step S23, so that the two match.
- the optimal recording power is determined by controlling the recording power.
- step S25 the adjusted Data recording is performed using the recording power and the power ratio obtained in step S22. That is, by setting the power ratio determined in step S22 in the laser waveform control unit 240, the laser waveform control unit 240 generates a write strategy based on the recording data, and determines the recording power determined in step S24. Thus, writing to the optical disk 160 is performed.
- the present inventors have set a condition under which the reproduction jitter is minimized when the recording condition of the optical recording device used for recording is different from the recording condition used when determining the recommended write strategy value. The required experiment was performed.
- the recommended value of the modulation degree is recorded on the optical disk 160. Therefore, it is necessary to estimate the value of the recommended pulse width.
- the modulation value at which the reproduction jitter was minimized optimum modulation value
- FIG. 22 shows the reproduction jitter when recording was performed using three types of power ratios on seven types of optical discs A to G.
- an X mark indicates a reproduction jitter when recording is performed using the recommended power ratio value recorded on each optical disc.
- the mark “ ⁇ ” indicates the reproduction jitter when recording is performed using the optimum power ratio adjusted so as to obtain the optimum reproduction jitter for each optical disc.
- the mark “ ⁇ ” indicates the reproduction jitter when recording is performed using the power ratio corrected using the above-described equation (9).
- all the recordings using the corrected power ratio recommended value ( ⁇ ) are better than the recordings using the recommended power ratio value recorded on each optical disc (X). Good reproduction jitter was obtained on the disc. Also, when recording using the corrected power ratio recommended value ( ⁇ ), almost as good reproduction jitter can be obtained as when recording using the optimal power ratio ( ⁇ ). Was.
- the optical system conditions such as the numerical aperture and the wavelength when generally determining the recommended values recorded on the optical recording medium are different from the optical conditions of a commercially available optical recording device.
- Power Considering the difference between the specifications of the optical system of a commercially available optical recording device, especially its optical pickup, and the specifications of the optical system when the recommended values are determined, the power ratio and modulation degree suitable for each optical recording device Can be obtained, and recording can be performed under recording conditions suitable for each optical recording apparatus.
- the power ratio and the modulation factor are experimentally determined.
- the constants (KE2, CE2, KMOD2, KMOD3, CMOD2) of the calculation formula used for the calculation are obtained, and these are stored in the optical recording device, for example, in the nonvolatile memory of the central control unit. By reading and using the constants, it is possible to easily calculate the power ratio and the modulation factor suitable for each recording device.
- the determination of the constant may be performed only once for each type or specification of optical recording device, and the same constant can be used for many optical recording devices of the same type or specification. That is, when a constant is obtained for an optical recording device of a certain type or specification, the obtained constant may be set for an optical recording device of the same type or specification and shipped.
- the constants (KE2, CE2, KMOD2, KMOD3, CMOD2) of the equations (9) and (10) are again selected or determined, so that the recording conditions can be changed. Optimization can be performed easily.
- the power ratio used for recording and the value of modulation are set to the recommended power ratio of the write strategy recommended value recorded on the optical disc 160 and the recommended recording power value. And formulas (9) and (10), so that recording can be performed on any recording device and recording medium that does not need to hold the recommended pulse width and a large amount of strategy information. .
- the force using the recommended value of the first pulse of the strategy pulse when recording the shortest mark is used.
- the first pulse of the strategy pulse when recording the second shortest mark is used.
- the recommended pulse width or the third shortest mark force The strategy for recording the longest mark ⁇ the recommended first pulse width of the pulse may be used instead.
- the pulse width is adjusted (correction from the recommended pulse width), and the pulse width may be adjusted.
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US11/587,697 US7903518B2 (en) | 2004-05-10 | 2005-04-26 | Optical recording method and optical recording device |
US13/016,142 US8315137B2 (en) | 2004-05-10 | 2011-01-28 | Optical recording method and optical recording device |
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JP2004139386A JP3907639B2 (ja) | 2004-05-10 | 2004-05-10 | 光記録方法及び光記録装置 |
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US13/016,142 Division US8315137B2 (en) | 2004-05-10 | 2011-01-28 | Optical recording method and optical recording device |
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US (2) | US7903518B2 (ja) |
JP (1) | JP3907639B2 (ja) |
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Cited By (2)
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EP1798725A2 (en) | 2005-12-14 | 2007-06-20 | Taiyo Yuden Co., Ltd. | Apparatus and method for optical information recording and reproducing |
US8085634B2 (en) | 2006-07-10 | 2011-12-27 | Teac Corporation | Optical disk drive, and method for determining recording strategy |
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JP3907630B2 (ja) * | 2004-03-02 | 2007-04-18 | 三菱電機株式会社 | 光記録方法及び光記録装置 |
JP2007280511A (ja) | 2006-04-06 | 2007-10-25 | Funai Electric Co Ltd | 光ディスク装置 |
JP4539615B2 (ja) * | 2006-07-28 | 2010-09-08 | 株式会社日立製作所 | 記録ストラテジ決定方法、光ディスク記録方法、光ディスク及び光ディスク装置 |
JP4730314B2 (ja) * | 2007-01-26 | 2011-07-20 | 船井電機株式会社 | 光ディスク記録装置 |
WO2008139357A2 (en) * | 2007-05-14 | 2008-11-20 | Koninklijke Philips Electronics N.V. | Efficient method for optimizing write strategies in optical recording |
KR100953548B1 (ko) * | 2007-10-09 | 2010-04-21 | 도시바삼성스토리지테크놀러지코리아 주식회사 | 기록 전략 방법 및 그에 따른 광 기록/재생 장치 |
JP5328904B2 (ja) * | 2009-05-18 | 2013-10-30 | 三菱電機株式会社 | 光記録方法及び光記録装置 |
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- 2005-04-26 US US11/587,697 patent/US7903518B2/en not_active Expired - Fee Related
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Also Published As
Publication number | Publication date |
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JP2005322312A (ja) | 2005-11-17 |
US8315137B2 (en) | 2012-11-20 |
TW200540832A (en) | 2005-12-16 |
TWI308327B (en) | 2009-04-01 |
JP3907639B2 (ja) | 2007-04-18 |
US20080062842A1 (en) | 2008-03-13 |
US7903518B2 (en) | 2011-03-08 |
US20110128836A1 (en) | 2011-06-02 |
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