JP2009245592A - Optical disk recording method, optical disk recording and reproducing device, and optical disk - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To represent relations of an asymmetry value and a β value to main power Pw by appropriate straight lines when recording is performed to an optical disk using an organic dye. <P>SOLUTION: An optical disk recording method includes a step of determining whether the optical disk to be a writing object is formed by using the organic dye and a control step of controlling a laser so that space forming power Ps required for space formation is made lower than bias power Pbw when the optical disk is determined as the optical disk formed by using the organic dye. When the relation of Ps<Pbw is satisfied, the relations of the asymmetry value and the β value to the main power Pw are represented by the preferable straight lines. Thereby, control of the main power Pw is performed using the asymmetry value and the β value as evaluation indices and coping with disturbance and the like is easily performed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a technique for appropriately performing data recording on an optical disk using an organic dye.

  With respect to an optical disk using an inorganic material (for example, a Blu-ray standard recording optical disk), for example, the characteristics shown in FIG. Specifically, the horizontal axis represents main power (recording power at the time of mark formation) Pw, and the left vertical axis represents DCJ (DC jitter [%], a curve connecting solid diamonds). The vertical axis on the right represents an asymmetry value (Asym, a curve connecting white rectangles). DCJ is the standard deviation of the phase difference between the binarized RF signal obtained by binarizing the RF signal and the clock signal generated from the binarized RF signal. The asymmetry value is an evaluation index representing the symmetry of amplitude between the shortest recording mark and the shortest space and the longest recording mark and the longest space in the RF signal.

  As shown in FIG. 1, the DCJ has a curve like a quadratic function that becomes the minimum when the main power Pw is about 5.4 mW, and the asymmetry value increases almost linearly as the main power Pw increases. To do. For optical discs using such inorganic materials, if there is a problem with detecting the asymmetry value (or β value, either asymmetry value or β value is used; the same applies hereinafter), the main power If Pw is adjusted according to the curve shown in FIG. 1, a desired asymmetry value (or β value) can be obtained. Therefore, for example, in WOPC (Walking OPC (Optimum Power Control)), the main power Pw is controlled using the asymmetry value as an evaluation index, and the disc internal and external differences such as the film thickness of the recording material, the reflective film thickness, the plate thickness, the warp, etc. It is possible to deal with disturbances caused by the drive, and disturbances of the drive such as temperature change of the laser diode and servo operation.

  On the other hand, for an optical disk using an organic dye, for example, characteristics as shown in FIG. The horizontal axis and the vertical axis are the same as those in FIG. Although DCJ has a different value, it has a curve like a quadratic function in the case of an organic dye as in the case of an inorganic material, but the asymmetry value is the same as that of the inorganic material shown in FIG. No linearity is found. That is, the asymmetry value (or β value) cannot determine whether or not an appropriate main power Pw is set.

  In Japanese Patent Laid-Open No. 2003-323717, a recording pulse is applied on the optical information recording medium in order to further improve the recording accuracy by suppressing the influence of heat accumulation and thermal diffusion on the recording surface of the optical information recording medium. When recording information by forming a recording mark on an optical information recording medium in an irradiating optical information recording device, the power of the recording pulse varies between the write power and the bias power required to form the recording mark. A technique is disclosed in which the bias power is made lower than the read power necessary for reproducing the recording mark. However, it does not solve the above problems.

JP 2003-323717 A

  As described above, when adopting an optical disk using an organic dye, if the conventional strategy or the like is adopted, the asymmetry value or β value is used as an evaluation index, and the disturbance as described above. There is a problem that it cannot deal with.

  Further, when the detection accuracy of the asymmetry value or β value is low, the slope of the straight line representing the relationship between the asymmetry value or β value and the main power Pw needs to be large. In addition, the linearity of the straight line representing the relationship between the asymmetry value or β value and the main power Pw must be maintained.

  Therefore, an object of the present invention is to provide a technique for making the relationship between the asymmetry value, the β value, and the main power Pw represented by an appropriate straight line when recording on an optical disk using an organic dye. Is to provide.

  Another object of the present invention is to provide a technique for maintaining the linearity of a straight line representing the relationship between the asymmetry value and β value and the main power Pw when recording on an optical disk using an organic dye. Is to provide.

  In the optical disc recording method according to the first aspect of the present invention, it is determined whether the optical disc to be written is an optical disc using an organic dye, and the optical disc is an optical disc using an organic dye. In some cases, the method includes a control step of controlling the laser so that the space forming power Ps necessary for forming the space is equal to or lower than the bias power Pbw. According to the non-obvious knowledge of the present inventor, when the relationship of Ps ≦ Pbw is satisfied, the relationship between the asymmetry value or β value and the main power Pw is represented by a preferable straight line. Therefore, the main power Pw can be controlled using the asymmetry value and the β value as an evaluation index, and disturbances can be easily dealt with. That is, appropriate data recording can be performed on an optical disk using an organic dye.

  Note that the control steps described above may be executed when the recording speed is equal to or higher than the double speed of the single speed recording. In the Blu-ray standard, the condition of Ps> Pbw is defined for the 1 × speed. Therefore, in the case of the Blu-ray standard, the control step may be performed for the 2 × speed or more.

  The optical disc recording / reproducing apparatus according to the second aspect of the present invention determines that the optical disc to be written is an optical disc using an organic dye, and that the optical disc is an optical disc using an organic dye. In this case, a control means for controlling the laser so that the space forming power Ps necessary for forming the space is equal to or less than the bias power Pbw. The parameter for determining Ps and Pbw may be stored in the memory of the optical disc recording / reproducing apparatus.

In the optical disk using the organic dye according to the third aspect of the present invention, the parameter ε _ps and the bias power Pbw for setting the space forming power Ps necessary for forming a space on the optical disk are set. For storing the parameter ε _bw . The parameter ε _ps and the parameter ε _bw are parameters that _satisfy ε _ps ≦ ε _bw . As described above, if the parameters for the optical disk are stored in the optical disk, appropriate recording can be performed in any optical disk recording / reproducing apparatus.

Note that the parameter ε _ps and the parameter ε _bw described above may be parameters used at a recording speed equal to or higher than double speed in single speed recording.

Further, the parameter ε _ps and the parameter ε _bw described above may be parameters that are multiplied by the mark formation power Pw necessary for forming a mark on the optical disc. Depending on the optical disc recording / reproducing apparatus, there are cases where only Ps = Pw × ε _ps and Pbw = Pw × ε _bw can be adjusted. In this application, such a restrictive case can be dealt with.

In the optical disk recording method according to the fourth aspect of the present invention, the step of determining whether the optical disk to be written is an optical disk using an organic dye, it is determined that the optical disk is an optical disk using an organic dye, and When the recording speed is 1 ×, a step of performing data recording using a space forming power Ps ₁ necessary for forming a space in 1 × speed recording and a bias power Pbw ₁ in 1 × speed recording; When it is determined that the optical disk is used and the recording speed is twice or more that of the 1 × speed recording, the space forming power Ps ₂ necessary for forming the space at the recording speed and the bias power Pbw ₂ at the recording speed are used. Recording data. Then, in which Ps _1, Pbw _1, Ps ₂ and Pbw ₂ are set so that _{Ps 1 / Pbw 1> Ps 2} / Pbw 2 is established. According to the non-obvious knowledge of the inventor of the present application, when the above condition is satisfied, the relationship between the asymmetry value or β value and the main power Pw is represented by a preferable straight line. Therefore, the main power Pw can be controlled using the asymmetry value and the β value as an evaluation index, and disturbances can be easily dealt with. That is, appropriate data recording can be performed on an optical disk using an organic dye.

In the optical disk recording / reproducing apparatus according to the fifth aspect of the present invention, it is determined that the optical disk to be written is an optical disk using an organic dye, and the optical disk is an optical disk using an organic dye. In this case, the space forming power Ps ₁ necessary for forming a space in 1 × speed recording, the bias power Pbw ₁ in 1 × speed recording, and the space forming power Ps ₂ required for forming a space in 2 × speed recording or more in 1 × speed recording. And control means for controlling the bias power Pbw ₂ in the recording at the double speed or higher in the single speed recording so that Ps ₁ / Pbw ₁ > Ps ₂ / Pbw ₂ is satisfied. The parameters for setting these powers may be stored in the memory of the optical disc recording / reproducing apparatus.

The optical disk using the organic dye according to the sixth aspect of the present invention has the parameter ε _ps1 for setting the space formation power Ps ₁ necessary for space formation in 1 × speed recording and the bias power Pbw ₁ in 1 × speed recording. Parameter ε _bw1 for setting, parameter ε _ps2 for setting space formation power Ps ₂ necessary for space formation in recording at 2 × speed or more in 1 × speed recording, and bias in recording at 2 × speed or more in 1 × speed recording A parameter ε _bw2 for setting the power Pbw ₂ is stored. The parameters ε _ps1 , ε _bw1 , ε _ps2, and ε _bw2 are parameters that _satisfy ε _ps1 / ε _bw1 > ε _ps2 / ε _bw2 . As described above, if the parameters for the optical disk are stored in the optical disk, appropriate recording can be performed in any optical disk recording / reproducing apparatus.

An optical disc recording method according to a seventh aspect of the present invention includes a step of determining whether an optical disc to be written is an optical disc using an organic dye, and determining that the optical disc is an optical disc using an organic dye and recording. When the speed is 1 ×, the step of performing data recording using the bias power Pbw ₁ in 1 × speed recording, the optical disc is determined to be an optical disc using an organic dye, and the recording speed is 2 of 1 × speed recording. If it is greater than or equal to twice, the step of recording data using the bias power Pbw ₂ at the recording speed is included. Then, in which the Pbw ₁ and Pbw ₂ are set so Pbw ₁ <Pbw ₂ holds. According to the non-obvious knowledge of the inventor of the present application, when the above condition is satisfied, the relationship between the asymmetry value or β value and the main power Pw is represented by a preferable straight line. Therefore, the main power Pw can be controlled using the asymmetry value and the β value as an evaluation index, and disturbances can be easily dealt with. That is, appropriate data recording can be performed on an optical disk using an organic dye.

In the optical disk recording / reproducing apparatus according to the eighth aspect of the present invention, it is determined that the optical disk to be written is an optical disk using an organic dye, and the optical disk is an optical disk using an organic dye. In this case, there is a control means for controlling the bias power Pbw ₁ in 1 × speed recording and the bias power Pbw ₂ in 2 × speed recording in 1 × speed recording so that Pbw ₁ <Pbw ₂ is satisfied. The parameters for setting these powers may be stored in the memory of the optical disc recording / reproducing apparatus.

Optical disc using the organic dye according to a ninth aspect of the present invention, a parameter epsilon _bw1 for setting bias power Pbw ₁ at 1 × speed recording, the bias power Pbw ₂ at the recording of more than 2 times faster than normal speed recording It stores a parameter ε _bw2 for setting. The parameters ε _bw1 and ε _bw2 are parameters that _satisfy ε _bw1 <ε _bw2 . As described above, if the parameters for the optical disk are stored in the optical disk, appropriate recording can be performed in any optical disk recording / reproducing apparatus.

  A program for causing a processor to execute the optical disk recording method of the present invention can be created. The program can be a storage medium such as a flexible disk, an optical disk such as a CD-ROM, a magneto-optical disk, a semiconductor memory, a hard disk, or the like. It is stored in a non-volatile memory of a storage device or processor. In some cases, digital signals are distributed via a network. Note that data being processed is temporarily stored in a storage device such as a processor memory.

  According to the present invention, when recording is performed on an optical disk using an organic dye, the relationship between the asymmetry value or β value and the main power Pw can be represented by an appropriate straight line.

  In addition, according to another aspect of the present invention, when recording is performed on an optical disc using an organic dye, linearity representing a relationship between an asymmetry value or a β value and the main power Pw can be maintained. become able to.

It is a figure showing the relationship between the main power Pw of an optical disk using an inorganic material, DCJ, and an asymmetry value. It is a figure showing the relationship between the main power Pw of the optical disk using an organic pigment | dye, DCJ, and an asymmetry value at the time of measuring using the conventional strategy data. It is a figure for demonstrating the waveform of recording power. It is a figure which shows the improvement degree of the curve showing the relationship between the main power Pw and the asymmetry value at the time of raising bias power Pbw. It is a figure for demonstrating the relationship between main power Pw at the time of changing bias power Pbw and (beta) value. It is a figure for comparing the case where (epsilon) _bw is changed and the case where bias power Pbw is fixed about the inclination of the straight line showing the relationship between main power Pw and (beta) value, and the precision of a linear approximation. It is a figure for demonstrating the relationship between main power Pw and DCJ at the time of changing bias power Pbw. It is a figure showing the relationship between main power Pw and (beta) value when the space formation power Ps is lowered | hung. It is a figure showing the relationship between main power Pw and DCJ when space formation power Ps is lowered. It is a figure showing the relationship between main power Pw and (beta) value when (epsilon) _bw is changed by 1 time speed recording. It is a figure showing the inclination of the straight line showing the relationship between the main power Pw and β value, and the accuracy of the straight line approximation when ε _bw is changed in 1 × speed recording and when Pbw is fixed. It is a figure showing the relationship between main power Pw and DCJ at the time of changing (epsilon) _bw by 1 time speed recording. It is a functional block diagram in an embodiment of the present invention. It is a figure which shows the processing flow in embodiment of this invention. It is a figure which shows the data structure stored in an optical disk.

[Principle of the present invention]
FIG. 3 schematically shows the waveform of a multi-pulse type recording pulse (Write Pulse). In FIG. 3, a space forming power Ps, which is a recording power necessary for forming a space, is used at the time of forming a space, and a main power Pw is used at the time of forming a mark. The bias power Pbw is used, and the cooling pulse power Pc is used for a cooling pulse that is a downward pulse after the last pulse of the mark. The inventor of the present application increases linearity between the asymmetry value and the main power Pw as shown in FIG. 4 by increasing the bias power Pbw as shown in FIG. 3 even in the case of an optical disk using an organic dye. I found it non-trivial to have. In particular, it is preferable to set Pbw higher than the read power ReadPw at the time of reproduction. In FIG. 4, the horizontal axis represents the main power Pw, the left vertical axis represents DCJ [%], and the right vertical axis represents the asymmetry value. There is no significant change in DCJ between before improvement (bias power Pbw is kept as it is) and after improvement (raise bias power Pbw), and there is almost no deterioration in recording quality. For example, when the main power Pw increases, the relationship that the asymmetry value decreases appears. In addition, in the case of inorganic materials, the polarity is high-to-low, so a straight line rising to the right as shown in FIG. 1 can be drawn, whereas in the case of an optical disk using an organic dye, low-to-high. Because of this polarity, a straight line going down to the right can be drawn.

More detailed data is shown in FIG. Here, β in each case of ε _bw = 0.254, ε _bw = 0.339, ε _bw = 0.424, and ε _bw = 0.508 when Pbw = Pw × ε _bw is set. This represents the relationship between the value and the main power Pw. The β value is obtained by AC coupling the RF signal, that is, when the DC component of the RF signal is removed and the GND level is used as a reference, and the difference between the amplitude of the longest recording mark M8T and the GND level is a. If the difference between the amplitude of the space S8T and the GND level is b, β = (ab) / (a + b). As can be seen from FIG. 5, in both cases, the relationship between the β value and the main power Pw can be approximated by a linear function.

Further detailed data is shown in FIG. In FIG. 6, the horizontal axis represents ε _bw or Pbw, the left vertical axis represents the scale of the bar graph, and the absolute value of the slope of each straight line in FIG. 5, and the right vertical axis represents the line graph. It represents a scale and represents the accuracy σ of each linear approximation in FIG. As can be seen from FIG. 6, the slope of the straight line increases as ε _bw increases. Further, when Pbw = 3.0, a larger inclination can be obtained. The larger the slope, the easier it is to control the recording power to an appropriate value even if the β value detection accuracy is low. Therefore, it is preferable to set Pbw to a fixed value instead of Pbw = Pw × ε _bw if possible. . In particular, when Pbw = 3.0 is fixed, the accuracy of linear approximation σ is also a large value, which is more preferable. However, there are cases where such settings cannot be made depending on the optical disc recording / reproducing apparatus, so fixing Pbw is not considered any further.

On the other hand, it can be seen that the accuracy σ of the linear approximation becomes worse as ε _bw increases. This is considered to be a phenomenon that occurs when a long mark is recorded too strongly when the bias power Pbw becomes too high. Therefore, with this as it is, ε _bw cannot be increased due to the accuracy σ of linear approximation, and the slope of the straight line cannot be sufficiently increased.

FIG. 7 shows the relationship between DCJ and main power Pw. In FIG. 7, the horizontal axis represents the main power Pw, and the vertical axis represents DCJ. It can be seen that even if ε _bw is changed, the DCJ curve hardly changes (at least one of Tmp and Tlp (3T) needs to be shortened), and the effect of increasing ε _bw is great.

  Here, the inventor of the present application has non-obviously found that the space forming power Ps is lowered than usual as a technique for improving linearity (that is, accuracy of linear approximation σ). By lowering the space forming power Ps below normal, the writing start of the 2T mark and the top pulse after 3T is delayed, and the heat balance at the time of high main power Pw is improved.

This effect is shown in FIG. FIG. 8 shows the relationship between the main power Pw and the β value when ε _ps = 0.25 and ε _ps = 0.20 when the space forming power Ps is calculated as ε _ps × Pw. Note that ε _bw = 0.5 and the recording speed is double speed. In FIG. 8, the horizontal axis represents the main power Pw, and the vertical axis represents β. As can be seen from FIG. 8, when ε _ps = 0.20, the accuracy of linear approximation (here, R ² ) is improved and the value of the slope is larger than ε _ps = 0.25.

FIG. 9 shows the relationship between the main power Pw and the DCJ. In FIG. 9, the horizontal axis represents the main power Pw, and the vertical axis represents DCJ. As can be seen from FIG. 9, the DCJ curves are somewhat different between ε _ps = 0.25 and ε _ps = 0.20, but it can be seen that there is no significant degradation.

As described above, it can be seen that it is effective to decrease ε _ps while increasing ε _bw . This is synonymous with lowering Ps while raising Pbw.

Furthermore, if the recording speed is 1 × speed, the Blu-ray standard specifies that Pbw <Ps, but at a recording speed of 2 × speed or higher, the relationship between Pbw and Ps is not specified. Here, it can also be seen that in the case shown in FIG. 8, the double speed recording is performed, and the relations Pbw ≧ Ps and ε _bw ≧ ε _ps are established. That is, when the recording speed is 2 × or higher, it is understood that the relationship between Pbw and Ps is preferably completely opposite to that at 1 × speed.

Next, the relationship between the recording speed of 1 × speed and 2 × speed will be considered. 5 to 9 show data at the double speed. 5 to 7, when Pw = 5.9 mW where DCJ is lowest, Pbw = 1.5 mW when ε _bw = 0.254, and Pbw = 1.539 when ε _bw = 0.339. it is 2.0mW, if ε _bw = 0.424 is Pbw = 2.5mW, a Pbw = 3.0mW if ε _bw = 0.508. 5 to 7, ε _ps = 0.254, Ps = 1.5 mW, ε _c = 0.017, and Pc = 0.1 mW.

On the other hand, when the recording speed is 1 ×, and ε _ps = 0.333 and ε _c = 0.026, ε _bw = 0.333, ε _bw = 0.256, and ε _bw = 0.179 are changed. FIG. 10 shows the relationship between the β value and the main power Pw in the case of the above. In FIG. 10, the horizontal axis represents the main power Pw, and the vertical axis represents the β value. As described above, in any case, the curve can be approximated by a straight line that is substantially downwardly to the right. However, when ε _bw = 0.333, it can be seen that the linearity is impaired at the portion where the main power Pw is high.

This can also be seen from FIG. In FIG. 11, the horizontal axis represents ε _bw and Pbw, the left vertical axis represents the scale of the bar graph and represents the absolute value of the slope of the straight line in FIG. 10, and the right vertical axis represents the scale of the line graph. And represents the approximation accuracy σ of the straight line in FIG. In the case of 1 × speed, unlike in the case of 2 × speed, if ε _bw becomes too large, the slope becomes small and the accuracy of linear approximation σ also deteriorates, and it cannot be adopted unless ε _bw = 0.256. However, it is better to fix Pbw like Pbw = 1.3 mW, as in the case of double speed.

FIG. 12 shows the relationship between DCJ and main power Pw. In FIG. 12, the horizontal axis represents the main power Pw, and the vertical axis represents DCJ [%]. As can be seen from FIG. 12, the curve of DCJ hardly changes even if ε _bw varies. It can also be seen that DCJ is the smallest when Pw = 3.9 mW. Incidentally, if Pw = 3.9 mW, if the epsilon _bw = 0.179 a Pbw = 0.7 mW, if the epsilon _bw = 0.256 a Pbw = 1.0, the epsilon _bw = 0.333 Case Pbw = 1.3. Since ε _ps = 0.333, Ps = 1.3 mW and ε _c = 0.026, so Pc = 0.1 mW.

Here, if DCJ is the smallest Pw, Ps1 / Pbw1 = 1.3 / 1.0 in the case of 1 × speed (when ε _bw = 0.256 (range in which linearity is acceptable)) = 1.3 However, in the case of double speed, Ps 2 / Pbw 2 = 1.5 / 2.5 (when ε _bw = 0.424 (range in which linearity is acceptable)) = 0.6. That is, Ps1 / Pbw1> Ps2 / Pbw2 holds. This is because the requirement of Ps> Pbw is imposed at 1 × speed, but the condition of Ps ≦ Pbw is preferable at 2 × speed or more as described above. Similarly, ε _s1 / ε _bw1 > ε _s2 / ε _bw2 holds. The subscript number for ε represents the recording speed.

In addition, the requirement that Ps> Pbw is imposed at 1 × speed, but since the condition of Ps ≦ Pbw is preferable at 2 × speed or more, Ps is slightly different between 1 × speed and 2 × speed. Although different, the relationship Pbw1 <Pbw2 holds. ε _bw1 <ε _bw2 also holds.

As described above, by increasing ε _bw and Pbw and decreasing ε _ps and Ps as much as possible, the relationship between the asymmetry value or β value and the main power Pw is a more linear line while suppressing the influence on the DCJ. Can be expressed as

At that time, if the recording speed is twice or more, Ps ≦ Pbw, and ε _ps ≦ ε _bw is preferable. In the case of 1 × speed recording, Ps> Pbw is defined in the Blu-ray standard, but the effect can be obtained by reducing Ps as much as possible.

Furthermore, taking into account the recording speed, Ps1 / Pbw1> Ps2 / Pbw2 , ε s1 / ε bw1> ε s2 / ε bw2, Pbw1 <Pbw2, when ε _bw1 <ε _bw2 holds, is effective.

[Embodiment]
A functional block diagram of the drive system in the embodiment of the present invention will be described with reference to FIG. The drive system according to the embodiment of the present invention includes an optical disc recording / reproducing apparatus 100 and an input / output system (not shown) including a display unit such as a television receiver and an operation unit such as a remote controller.

  The optical disc recording / reproducing apparatus 100 includes a memory 127 that stores data in the middle of processing, data of processing results, reference data in processing, and the like, and a CPU that includes a memory circuit 126 in which a program for performing processing described below is recorded. A control circuit 125 including a central processing unit (Central Processing Unit), an interface unit (I / F) 128 that is an interface with an input / output system, and a maximum amplitude level or minimum amplitude of an RF signal that is a reproduction signal A characteristic value detection unit 124 that detects a level and the like, and a 2T to 8T code (for example, in the case of the Blu-ray standard. In the case of the Blu-ray standard, the synchronous code 9T is also identified. In the case of the DVD standard, 2T to 11T code and 13T of the synchronization code are identified). The data demodulating circuit 123 that performs a process for decoding the data, the pickup unit 110, and the data to be recorded output from the control circuit 125 are subjected to predetermined modulation, and are sent to the laser diode (LD) driver 121. A data modulation circuit 129 to output, an LD driver 121, a rotation control unit and a motor of the optical disc 150, a servo control unit (not shown) for the pickup unit 110, and the like are included.

  The pickup unit 110 includes an objective lens 114, a beam splitter 116, a detection lens 115, a collimator lens 113, an LD 111, and a photodetector (PD) 112. In the pickup unit 110, an actuator (not shown) operates in accordance with control of a servo control unit (not shown), and focusing and tracking are performed.

  The control circuit 125 is connected to the memory 127, the characteristic value detection unit 124, the I / F 128, the LD driver 121, the data modulation circuit 129, a rotation control unit and a servo control unit (not shown), and the like. In addition, the characteristic value detection unit 124 is connected to the PD 112, the control circuit 125, and the like. The LD driver 121 is connected to the data modulation circuit 129, the control circuit 125, and the LD 111. The control circuit 125 is also connected to the input / output system via the I / F 128.

  Next, an outline of processing when data is recorded on the optical disc 150 will be described. First, the control circuit 125 causes the data modulation circuit 129 to perform a predetermined modulation process on the data to be recorded on the optical disc 150, and the data modulation circuit 129 outputs the data after the modulation process to the LD driver 121. The LD driver 121 drives the LD 111 with the received data according to designated recording conditions (strategies and parameters) to output laser light. The laser light is irradiated onto the disk 150 through the collimating lens 113, the beam splitter 116, and the objective lens 114, thereby forming marks and spaces on the optical disk 150.

  An outline of processing when data recorded on the optical disc 150 is reproduced will be described. In accordance with an instruction from the control circuit 125, the LD driver 121 drives the LD 111 to output laser light. The laser light is irradiated onto the optical disc 150 through the collimating lens 113, the beam splitter 116, and the objective lens 114. The reflected light from the optical disk 150 is input to the PD 112 via the objective lens 114, the beam splitter 116, and the detection lens 115. The PD 112 converts the reflected light from the optical disc 150 into an electrical signal and outputs it to the characteristic value detection unit 124 and the like. The data demodulation circuit 123 and the like perform predetermined decoding processing on the output reproduction signal, and output the decoded data to the display unit of the input / output system via the control circuit 125 and the I / F 128 for reproduction. Display data. The characteristic value detection unit 124 is not used in normal reproduction.

  Next, the operation of the optical disc recording / reproducing apparatus 100 will be described with reference to FIG. First, the control circuit 125 reproduces the media ID recorded on the optical disc 150 by the PD 112 and the data demodulation circuit 123 and compares it with the media ID of the optical disc using the organic dye registered in the memory 127 in advance. Alternatively, data such as the reflectance of the optical disc 150 is acquired by the characteristic value detection unit 124 or the like, and it is determined whether or not the reflectance is a predetermined value. It is determined whether the optical disk is an organic dye (step S1). If the optical disk is not an organic dye, normal processing is performed instead of processing according to the present embodiment (step S21), and the processing is terminated.

On the other hand, if it is determined that the optical disk uses an organic dye, the control circuit 125 determines whether the recording speed is double speed or more based on an instruction from the user input via the I / F 128. Judgment is made (step S3). When performing data recording at a speed of 2 × or higher, the control circuit 125, for example, from the memory 127 or the optical disc 150, ε _ps and ε _bw (as described in the section of the principle of the invention, ε _ps ≦ ε _bw Parameters and various strategy data are read out (step S5), and the parameters and various strategy data are initialized (step S7). The power values such as the space forming power Ps and the bias power Pbw depending on the main power Pw are initially set in the LD driver 121 and the like based on the initial value of the main power Pw. Note that the parameters for the 1 × speed are not used here.

  Then, a known process for optimizing the main power Pw is performed (step S9). At this time, the characteristic value detection unit 124 detects a characteristic value for calculating an asymmetry value or a β value and outputs it to the control circuit 125. When the main power Pw is optimized, the control circuit 125 causes the space forming power Ps and the bias power Pbw corresponding to the optimized main power Pw (Ps ≦ Pbw as described in the section of the principle of the invention). Etc. are set in the LD driver 121 and the like to perform data recording (step S11).

  By carrying out such processing, the effects described in the column of the principle of the invention can be obtained, and the main power Pw can be appropriately controlled even in WOPC or the like.

On the other hand, when data recording is performed at 1 × speed, the control circuit 125, for example, from the memory 127 or the optical disk 150, ε _ps and ε _bw (as described in the section of the principle of the invention, ε _ps > ε _bw The parameter and various strategy data including a predetermined value (however, ε _ps is as small as possible) are read (step S13), and the parameter and the various strategy data are initialized (step S15). The power values such as the space forming power Ps and the bias power Pbw depending on the main power Pw are initially set in the LD driver 121 and the like based on the initial value of the main power Pw. Note that parameters for double speed are not used here.

  Then, a known process for optimizing the main power Pw is performed (step S17). At this time, the characteristic value detection unit 124 detects a characteristic value for calculating an asymmetry value or a β value and outputs it to the control circuit 125. When the main power Pw is optimized, the control circuit 125 causes the space forming power Ps and the bias power Pbw corresponding to the optimized main power Pw (Ps> Pbw as described in the section of the principle of the invention). However, Ps is as small as possible.) Is set in the LD driver 121 and the like, and data recording is performed (step S19).

  By carrying out such processing, the effects described in the column of the principle of the invention can be obtained, and the main power Pw can be appropriately controlled even in WOPC or the like.

Note that ε _ps and ε _bw for 1 × speed recording and 2 × or higher recording speed may be stored in the memory 127 or in the optical disc 150. When it is held on the optical disc 150, it is held in the Lead-in area as shown in FIG. The lead-in area is largely divided into a system lead-in area, a connection area, and a data lead-in area. The system lead-in area includes an initial zone, a buffer zone, a control data zone, and a buffer. -Includes zones. The connection area includes a connection zone. Further, the data lead-in area includes a guard track zone, a disc test zone, a drive test zone, a guard track zone, an RMD duplication zone, a recording management zone, an R-physical format information zone, and a reference code. -Includes zones. In the present embodiment, the recording condition data zone 170 is included in the control data zone of the system lead-in area. For example, ε _ps and ε _bw are stored in the recording condition data zone 170.

  Although the embodiment of the present invention has been described above, the present invention is not limited to this. For example, the functional block diagram of FIG. 13 is shown for explaining the embodiment, and may not necessarily match an actual circuit or module configuration. In addition, as for the processing flow, as long as the processing result is the same, the processing order may be changed, or the processing order may be executed in parallel.

  Even if other methods are employed in addition to the method described in the column of the principle of the invention, the slope of the straight line representing the relationship between the asymmetry value or β value and the main power Pw is increased and the linearity is increased. Can do. For example, a method of increasing the top pulse length Ttop only for a short mark (for example, 2T, 3T, 4T, etc.), a method of increasing the last pulse length Tlp for a code of 3T alone or 4T or more, and shortening Ttop As in the case of lowering Ps, it is considered that a method of increasing the slope of β when Pw changes by making it difficult to write a short mark is also effective. This increases the contribution of the main power Pw of a short mark with little influence on the I8H fluctuation, and increases the average level fluctuation of the RF signal more than the I8H fluctuation, thereby increasing the β value when the main power Pw is small. This is because when the main power Pw is large, the β value decreases, so that the inclination should increase.

100 Optical Disc Recording / Reproducing Device 110 Pickup Unit 111 LD
112 PD 113 Collimating lens 114 Objective lens 115 Detection lens 116 Beam splitter 121 LD driver 123 Data demodulation circuit 124 Characteristic value detection unit 125 Control circuit 126 Memory circuit 127 Memory 128 I / F 129 Data modulation circuit 150 Optical disc

Claims (6)

Determining whether the optical disc to be written is an optical disc using an organic dye;
When it is determined that the optical disk is an optical disk using an organic dye and the recording speed is 1 × speed, the space formation power Ps ₁ necessary for space formation in 1 × speed recording and the bias power Pbw ₁ in 1 × speed recording are obtained. Using to record data,
When it is determined that the optical disk is an optical disk using an organic dye and the recording speed is at least twice as fast as the 1-time speed recording, the space formation power Ps ₂ necessary for space formation at the recording speed and the recording speed Recording data using the bias power Pbw ₂ at
Including
Ps ₁ / Pbw ₁ > Ps ₂ / Pbw ₂
An optical disc recording method in which Ps ₁ , Pbw ₁ , Ps _2, and Pbw ₂ are set so that Means for determining whether the optical disk to be written is an optical disk using an organic dye;
When it is determined that the optical disk is an optical disk using an organic dye, the space forming power Ps ₁ necessary for forming a space in 1 × speed recording, the bias power Pbw ₁ in 1 × speed recording, and the 1 × speed recording. A space forming power Ps ₂ necessary for forming a space in recording at 2 × speed or higher, and a bias power Pbw ₂ in recording at 2 × speed or higher of the 1 × speed recording,
Ps ₁ / Pbw ₁ > Ps ₂ / Pbw ₂
Control means for controlling so that
An optical disc recording / reproducing apparatus having: An optical disk using an organic dye,
Parameter ε _ps1 for setting space formation power Ps ₁ necessary for space formation in 1 × speed recording, parameter ε _bw1 for setting bias power Pbw ₁ in 1 × speed recording, and at least 2 × speed of the 1 × speed recording Stores a parameter ε _ps2 for setting the space forming power Ps ₂ necessary for forming a space in recording, and a parameter ε _bw2 for setting the bias power Pbw ₂ in recording at 2 × speed or more of the 1 × speed recording. And
The parameters ε _ps1 , ε _bw1 , ε _ps2 and ε _bw2 are
ε _ps1 / ε _bw1 > ε _ps2 / ε _bw2
Is the parameter that holds. Determining whether the optical disc to be written is an optical disc using an organic dye;
If the optical disc is determined to be an optical disc using an organic dye and the recording speed is 1 × speed, recording data using bias power Pbw ₁ in 1 × speed recording;
If it is determined that the optical disk is an optical disk using an organic dye and the recording speed is at least twice as fast as the one-time speed recording, performing data recording using the bias power Pbw ₂ at the recording speed;
Including
Said Pbw ₁ <Pbw ₂
An optical disc recording method in which Pbw ₁ and Pbw ₂ are set so that Means for determining whether the optical disk to be written is an optical disk using an organic dye;
When it is determined that the optical disc is an optical disc using an organic dye, a bias power Pbw ₁ in 1 × speed recording and a bias power Pbw ₂ in recording at 2 × speed or more of the 1 × speed recording are:
Pbw ₁ <Pbw ₂
Control means for controlling so that
An optical disc recording / reproducing apparatus having: An optical disk using an organic dye,
A parameter ε _bw1 for setting the bias power Pbw ₁ in the 1 × speed recording, and a parameter ε _bw2 for setting the bias power Pbw ₂ in the recording at the 2 × speed or more of the 1 × speed recording,
The parameters ε _bw1 and ε _bw2 are
ε _bw1 <ε _bw2
Is the parameter that holds.

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