JP2009295242A - Data recording method, optical disk recording and reproducing device, and optical disk - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To express a relation among an asymmetry value, a β value and write power Pw with an appropriate straight line when recording is made to an optical disk using organic coloring matter. <P>SOLUTION: This data recording method includes steps of: reading the medium ID of the optical disk being the object of data recording; and setting intermediate bias power Pm, the Pw, and space forming power Ps so that, when the read medium ID indicates that it is an optical disk provided with a recording layer having absorption spectrum recordable within a range of wavelength of 400 to 410 nm, a ratio X of write power Pw in a top pulse and a last pulse included in castle type recording pulse waveform to the intermediate bias power Pm in an intermediate pulse included in the castle type recording pulse waveform satisfies a first condition, and a ratio Y of space forming power Ps in a space forming pulse included in the castle type recording pulse waveform to Pw satisfies a second condition. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a technique for appropriately performing data recording on an optical disc provided with a recording layer having an absorption spectrum that can be recorded in a wavelength range of 400 to 410 nm.

  An optical disc for high-density recording / reproduction such as a write-once Blu-ray disc (BD-R) or a write-once HD DVD disc (HD DVD-R) has a recording layer and a reflective layer on one surface of a light-transmitting disc-like substrate. And a structure in which a protective layer is formed as necessary. Further, a spiral or concentric groove called a groove is formed on one surface of the substrate on which the recording layer and the reflective layer are formed, and a convex shape called a land is formed between adjacent grooves. . In such a high-density recording / reproducing optical disk, the optical disk recording / reproducing apparatus irradiates the recording layer on the groove while tracking a recording laser along the groove, and the reference channel clock period is T, and an integer n When a double length is nT, a pit having a length nT (hereinafter referred to as a recording mark) and a portion having a length of nT and a portion between the recording marks (hereinafter referred to as a space) are repeatedly formed. Information is recorded. Further, information is reproduced by converting the reflected light into a reproduction signal by irradiating the reproduction laser beam to the array of these recording marks and spaces by the optical disc recording / reproducing apparatus.

  Further, when information is recorded on the optical disc as a recording mark or space code, the recording laser pulse is controlled to be a pulse train including a single pulse or a plurality of short pulses. For example, in the case of a short recording mark such as a recording mark having a length of 2T among the recording mark codes having a length of nT, a single pulse pattern is often used, and a recording mark having a length of 4T or more is fixed. When writing in width, a plurality of short divided pulse patterns are often used. In this way, by operating the recording laser pulse with the modulation waveform, the recording laser irradiation conditions for further improving the recording accuracy by suppressing the influence of heat accumulation and thermal diffusion on the recording surface of the optical information recording medium are set. This is called a light strategy.

  When an optical disc for write-once type high-density recording / playback using an inorganic material is recorded with the conventional write strategy, the asymmetry value (the shortest recording mark and the shortest space in the RF signal and the longest recording mark and the longest space are In most cases, the evaluation index representing the symmetry of the amplitude (which may be a β value) increases almost linearly as the main power (also referred to as write power) Pw increases. Therefore, for example, in OPC (Optimum Power Control), WOPC (Walking OPC), etc., the main power Pw is controlled using the asymmetry value as an evaluation index, so that the recording material film thickness, reflective film thickness, plate thickness, warp, etc. It can deal with disturbances due to internal and external differences and drive disturbances such as laser diode temperature changes and servo operations.

  On the other hand, when a write-once optical disc having a recording layer having an absorption spectrum that can be recorded in the wavelength range of 400 to 410 nm is recorded with a conventional strategy or the like, DC (Data to Clock) jitter is Although the value is different with respect to the power Pw, a curve like a quadratic function is obtained in the case of an organic dye as in the case of an inorganic material, but the asymmetry value is linear as in the case of an inorganic material. Cannot be obtained. That is, the asymmetry value (or β value) cannot determine whether an appropriate main power Pw is set.

Japanese Patent Application Laid-Open No. 2004-95007 discloses a technique for obtaining good recording characteristics even when the bias power level of a recording pulse waveform is changed in an information recording apparatus for an optical disk or the like. Specifically, when the bias power level of the recording pulse waveform is changed in whole or in part, the shape of the recording pulse waveform is changed according to the change. For example, when increasing the bias power level, the width and edge position of the top pulse and multi-pulse of the recording pulse waveform are changed accordingly, so that the total heat quantity of the recording laser beam does not increase, and good recording characteristics To maintain. However, the problem of data recording on a write-once type optical disc provided with a recording layer having an absorption spectrum that can be recorded in the wavelength range of 400 to 410 nm is not described.
JP 2004-95007 A

  In a write once optical disc having a recording layer having an absorption spectrum that can be recorded in the wavelength range of 400 to 410 nm, when the write power Pw is changed, the β value or asymmetry value does not follow and takes a substantially constant value. appear.

  For this reason, even if a disturbance occurs during data recording, the β value and asymmetry value that have been used as evaluation indexes do not change so far, so that the optical disk recording / reproducing apparatus cannot determine the deterioration of recording characteristics, and the write power Pw It cannot be adjusted. For this reason, data recording is deteriorated, and in the worst case, problems such as recording stop and data reproduction impossible occur.

  Accordingly, an object of the present invention is to provide a relationship between the asymmetry value and β value and the write power Pw when performing recording on an optical disc having a recording layer having an absorption spectrum that can be recorded in the wavelength range of 400 to 410 nm. It is to provide a technique for making a proper straight line.

  Another object of the present invention is that when recording is performed on an optical disc having a recording layer having an absorption spectrum that can be recorded in the wavelength range of 400 to 410 nm, the asymmetry value, β value, and write power Pw It is to provide a technique for maintaining the linearity of a straight line representing a relationship.

  In the data recording method according to the first aspect of the present invention, media information of an optical disc to be recorded (media information includes, for example, manufacturer identification information (Manifacturer ID), and in addition to this, media identification is performed. And the read media information indicates that the read optical information is an optical disc having a recording layer having an absorption spectrum that can be recorded in the wavelength range of 400 to 410 nm. The ratio X of the write power Pw in the top pulse and the last pulse included in the castle type recording pulse waveform to the intermediate bias power Pm in the intermediate pulse included in the castle type (also referred to as non-multi-pulse type) recording pulse waveform is the first. Satisfying the above conditions and the scan power included in the castle-type recording pulse waveform for the write power Pw. So that the ratio Y of the space forming power Ps satisfies the second condition in the over scan forming pulse, including intermediate bias power Pm, and setting the write power Pw and the space forming power Ps.

  According to the novel knowledge of the inventor of the present invention, by setting the intermediate bias power Pm, the write power Pw, and the space forming power Ps as described above, the relationship between the asymmetry value or β value and the write power Pw. Is represented by an appropriate straight line.

  Note that if the first condition described above is 1.2 <X <1.9, and the second condition described above is 0.16 <Y <0.31, the recording quality is good. It is possible to maintain linearity representing the relationship between the asymmetry value or β value and the write power Pw without any problem.

  The data recording method according to the second aspect of the present invention includes a step of reading media information of an optical disc to be recorded, and a recording layer having an absorption spectrum in which the read media information can be recorded in a wavelength range of 400 to 410 nm. In the case where the optical disk is provided with the write pulse waveform, the write power in the top pulse and the last pulse included in the castle type recording pulse waveform with respect to the intermediate bias power Pm in the intermediate pulse included in the castle type recording pulse waveform. The intermediate bias is set so that the ratio X of Pw satisfies the first condition, and the ratio Z of the space formation power Ps in the space formation pulse included in the castle type recording pulse waveform to the intermediate bias power Pm satisfies the second condition. Power Pm, write power Pw, and space formation capacity And a step of setting the over Ps.

  If the first condition described above is 1.2 <X <1.9, and the second condition described above is 0.25 <Z <0.47, the recording quality is high. It is possible to maintain linearity representing the relationship between the asymmetry value or β value and the write power Pw without any problem.

  The parameters as described above may be stored in a memory in the optical disk recording / reproducing apparatus, read from the memory, and set, for example, stored in the optical disk itself.

  Specifically, it is an optical disc having a recording layer having an absorption spectrum that can be recorded in the wavelength range of 400 to 410 nm, and has a castle type against an intermediate bias power Pm in an intermediate pulse included in the castle type recording pulse waveform. The ratio X of the write power Pw in the top pulse and the last pulse included in the recording pulse waveform satisfies the first condition, and the ratio of the space formation power Ps in the space formation pulse included in the castle type recording pulse waveform to the write power Pw. The setting data of the intermediate bias power Pm, the write power Pw, and the space forming power Ps so that Y satisfies the second condition is recorded. The first condition and the second condition may be the conditions described above.

  Note that the ratio X of the write power Pw in the top pulse and the last pulse included in the castle-type recording pulse waveform to the intermediate bias power Pm in the intermediate pulse included in the castle-type recording pulse waveform satisfies the first condition, The intermediate bias power Pm, the write power Pw, and the space formation power Ps such that the ratio Z of the space formation power Ps in the space formation pulse included in the castle type recording pulse waveform to the intermediate bias power Pm satisfies the second condition. In some cases, setting data is recorded. The first condition and the second condition may be the conditions described above.

  A program for causing a processor to execute the data 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, or a hard disk, or 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 disc having a recording layer having an absorption spectrum that can be recorded in the wavelength range of 400 to 410 nm, the relationship between the asymmetry value and β value and the write power Pw is appropriately set. It can be represented by a straight line.

  According to another aspect of the present invention, when recording is performed on an optical disc having a recording layer having an absorption spectrum that can be recorded in the wavelength range of 400 to 410 nm, an asymmetry value, a β value, and a write power Pw are recorded. It is possible to maintain the linearity of a straight line representing the relationship between

[Principle of the present invention]
FIG. 1 schematically shows the waveform of a castle type recording pulse (Write Pulse). The castle type recording pulse is used, for example, when recording is performed at a recording speed that is four times or more that of 1 × speed recording. In FIG.1 (c), a vertical axis | shaft represents an amplitude and a horizontal axis represents time. In FIG. 1C, the space forming power Ps, which is the recording power necessary for forming the space, is used at the time of forming the space, the write power Pw is used at the time of forming the mark, and the mark after the top pulse is used in the mark of 3T or more. An intermediate bias power Pm is used for the pulse, and a cooling pulse power Pc is used for the cooling pulse that is a downward pulse after the last pulse of the mark. The write power Pw is also used in the last pulse. Note that the laser power during reproduction is also shown in FIG. 1C as read power Pr.

  1A shows recording data (2T mark (P2T) and 8T mark (P8T)), and FIG. 1B shows a sampling signal waveform. When performing data recording on an optical disc having a recording layer having an absorption spectrum that can be recorded in the wavelength range of 400 to 410 nm, the inventor of the present application uses the space forming power Ps and the intermediate bias power Pm as the write power Pw. It is not obvious that the relationship between the asymmetry value and β value and the write power Pw can be expressed by an appropriate straight line while maintaining the recording quality by adjusting so as to satisfy the predetermined relationship. I found it.

  Hereinafter, how the space forming power Ps, the intermediate bias power Pm, and the write power Pw should be adjusted will be described with reference to FIGS. In the table shown in FIG. 2, the vertical axis represents a column of Pw / Pm values, and the horizontal axis represents a column of Ps / Pw values. In the table of FIG. 2, the combination of the Pw / Pm value and the Ps / Pw value at the point where the circles are plotted satisfies the criterion that the DCJ is less than 7%, and a predetermined value or more between the asymmetry value and the write power Pw. This indicates that it has been verified that a linear characteristic having a slope can be obtained. Similarly, the combination of the Pw / Pm value and the Ps / Pw value at the point where the x mark is plotted indicates that the above-described condition has not been satisfied. In summary, the range surrounded by the thick dotted line A is considered to be a range that satisfies the above conditions in the plane represented by the table of FIG. The range surrounded by the thick dotted line A is 1.2 <Pw / Pm <1.9 and 0.16 <Ps / Pw <0.31.

  Hereinafter, specific verification contents in the ranges B to E shown in FIG. 2 will be described with reference to FIGS. First, the verification contents in the range B are shown using FIG. FIG. 3 shows the relationship between the write power Pw and DCJ and the relationship between the write power Pw and the asymmetry value (Asym) when Ps / Pw is changed with Pw / Pm = 1.4. Represents. That is, in FIG. 3, the left vertical axis represents DCJ [%], the right vertical axis represents asymmetry value [%], and the horizontal axis represents write power Pw. In FIG. 3, a normal dotted line represents a line corresponding to a standard in which DCJ [%] is 7%. Therefore, when exceeding the normal dotted line, the standard is not satisfied. The DCJ curve for Ps / Pw = 0.23 has a sufficient range less than the reference value, and the curve representing the relationship between the asymmetry value and the write power Pw has a sufficient slope. Also, the DCJ curve for Ps / Pw = 0.18 has a portion below the reference value, and the curve representing the relationship between the asymmetry value and the write power Pw has a sufficient slope. However, since the DCJ curve for Ps / Pw = 0.16 exceeds the standard, it cannot be adopted for Pw / Pm = 1.4 and Ps / Pw = 0.16.

  Next, the verification contents in the range C will be shown using FIG. FIG. 4 shows the relationship between the write power Pw and DCJ and the relationship between the write power Pw and the asymmetry value (Asym) when Ps / Pw is changed with Pw / Pm = 1.6. Represents. The configuration of the graph itself is the same as in FIGS. In FIG. 4, a normal dotted line represents a line corresponding to a standard on the basis of DCJ [%] of 7%, and a thick dotted line represents a standard on the standard of asymmetry value. Therefore, when the DCJ exceeds the normal dotted line, the standard is not satisfied, and when the asymmetry value exceeds the thick dotted line, the standard is not satisfied. In any case of Ps / Pw = 0.23, Ps / Pw = 0.29 and Ps / Pw = 0.31 shown in FIG. 4, the DCJ curve has a sufficient range less than the reference value, and there is no problem. . On the other hand, the curve representing the relationship between the asymmetry value and the write power Pw is below the asymmetry value reference when Ps / Pw = 0.23 and Ps / Pw = 0.29, and has a sufficient slope. However, in the case of Ps / Pw = 0.31, there is a part exceeding the standard of the asymmetry value, and the slope is not sufficient, so that it cannot be adopted for Pw / Pm = 1.6 and Ps / Pw = 0.31. .

  Next, the verification contents in the range D are shown using FIG. FIG. 5 shows the relationship between the write power Pw and DCJ and the relationship between the write power Pw and the asymmetry value (Asym) when Ps / Pw is fixed at 0.25 and Pw / Pm is changed. Represents. The configuration of the graph itself and the reference value are the same as those in FIGS. In the case of Pw / Pm = 1.5 and Pw / Pm = 1.7 shown in FIG. 5, the DCJ curve has a sufficient range less than the reference value, and there is no problem. However, when Pw / Pm = 1.9, the DCJ curve has many portions that exceed the reference value. Also, the curve representing the relationship between the asymmetry value and the write power Pw is below the asymmetry value reference when Pw / Pm = 1.5 and Pw / Pm = 1.7, and has a sufficient slope. However, in the case of Pw / Pm = 1.9, there is a part exceeding the standard of the asymmetry value, and the slope is not sufficient, so that Ps / Pw = 0.25 and Pw / Pm = 1.9 cannot be adopted. .

  Next, the verification contents in the range E will be shown using FIG. FIG. 6 shows the relationship between the write power Pw and DCJ and the relationship between the write power Pw and the asymmetry value (Asym) when Ps / Pw = 0.23 and Pw / Pm is changed. Represents. The configuration of the graph itself and the reference value are the same as those in FIGS. In the case of Pw / Pm = 1.3 shown in FIG. 6, there is no problem because the DCJ curve has a sufficient range below the reference value. However, in the case of Pw / Pm = 1.2, the DCJ curve is almost below the standard, so that Ps / Pw = 0.23 and Pw / Pm = 1.3 cannot be adopted.

  As described above, if the values of Ps / Pw and Pw / Pm are included in the range A of the thick dotted line in FIG. 2, the relationship between the write power Pw and the asymmetry value is satisfied while satisfying the requirements of the standard. The line is represented by a straight line having a predetermined inclination or more.

  In the case of a DVD-R or the like whose standard was formulated before a write-once Blu-ray disc (BD-R) or the like, it was used in a range of approximately 1.3 <Pw / Pm <1.6. When the value was 1.6 or more, there was a phenomenon that writing of a long T mark was deteriorated. This is because, of course, there is a difference in sensitivity depending on the wavelength of the laser to be used and the dye used in the optical disk. However, in the present invention, as described above, Ps is also appropriately adjusted. A wider range is available.

  In FIG. 2, the allowable range from Pw / Pm and Ps / Pw is defined based on the write power Pw. For example, the allowable range from Pw / Pm and Ps / Pm based on the intermediate bias power Pm. The range to be used may be specified. Hereinafter, such a case will be described with reference to FIGS.

  In the table shown in FIG. 7, the vertical axis represents a column of Pw / Pm values, and the horizontal axis represents a column of Ps / Pm values. In the table of FIG. 7, the combination of the Pw / Pm value and the Ps / Pm value at the point where a circle or a dotted line circle is plotted satisfies the criterion that the DCJ is less than 7% and is between the asymmetry value and the write power Pw. This indicates that it has been verified that a linear characteristic having a predetermined slope or more can be obtained. A dotted line (circle) mark represents that it is not included in the verification content described below. Similarly, the combination of the Pw / Pm value and the Ps / Pm value at the point where the x mark is plotted indicates that the above-described condition has not been satisfied. In summary, the range surrounded by the thick dotted line F is considered to be a range that satisfies the above conditions on the plane represented by the table of FIG. The range surrounded by the thick dotted line F is 1.2 <Pw / Pm <1.9 and 0.25 <Ps / Pm <0.47. In FIG. 7, the reason why the step of the horizontal axis is irregular is that the vertical column indicates the unit of verification execution.

  Hereinafter, specific verification contents in the ranges G to J shown in FIG. 7 will be described with reference to FIGS. 8 to 11. First, the verification contents in the range G are shown using FIG. FIG. 8 shows the relationship between the write power Pw and DCJ and the relationship between the write power Pw and the asymmetry value (Asym) when Ps / Pm is changed with Pw / Pm = 1.4. Represents. That is, in FIG. 8, the left vertical axis represents DCJ [%], the right vertical axis represents asymmetry value [%], and the horizontal axis represents write power Pw. In FIG. 8, a normal dotted line represents a line corresponding to a standard on the basis that DCJ [%] is 7%. Therefore, when exceeding the normal dotted line, the standard is not satisfied. The DCJ curve for Ps / Pm = 0.32 has a sufficient range less than the reference value, and the curve representing the relationship between the asymmetry value and the write power Pw has a sufficient slope. Further, the DCJ curve for Ps / Pm = 0.25 has a portion less than the reference value, but is secured temporarily, and the curve representing the relationship between the asymmetry value and the write power Pw has a sufficient slope. However, since the DCJ curve for Ps / Pm = 0.22 exceeds the standard, it cannot be adopted for Pw / Pm = 1.4 and Ps / Pm = 0.22.

  Next, the verification contents in the range H will be shown using FIG. FIG. 8 shows the relationship between the write power Pw and DCJ and the relationship between the write power Pw and the asymmetry value (Asym) when Ps / Pm is changed with Pw / Pm = 1.6. Represents. The configuration of the graph itself is the same as in FIGS. In FIG. 9, a normal dotted line represents a line corresponding to a standard in which DCJ [%] is 7%, and a thick dotted line represents a standard in the asymmetry value. Therefore, when the DCJ exceeds the normal dotted line, the standard is not satisfied, and when the asymmetry value exceeds the thick dotted line, the standard is not satisfied. In any case of Ps / Pm = 0.37, Ps / Pm = 0.46, and Ps / Pm = 0.5 shown in FIG. 9, the DCJ curve has a sufficient range below the reference value, and there is no problem. . On the other hand, the curve representing the relationship between the asymmetry value and the write power Pw is below the asymmetry value reference when Ps / Pm = 0.37 and Ps / Pm = 0.46, and has a sufficient slope. However, in the case of Ps / Pm = 0.5, the portion exceeding the asymmetry value standard has a wide range and the slope is not sufficient, so for Pw / Pm = 1.6 and Ps / Pm = 0.50 Cannot be adopted.

  Next, the verification contents in the range I are shown using FIG. FIG. 10 shows a combination of Ps / Pm = 0.38 and Pw / Pm = 1.5, a combination of Ps / Pm = 0.43 and Pw / Pm = 1.7, Ps / Pm = 0.48 and Pw / For the combination of Pm = 1.9, the relationship between the write power Pw and DCJ and the relationship between the write power Pw and the asymmetry value (Asym) are shown. The configuration of the graph itself and the reference value are the same as those in FIGS. In the case of the combination of Ps / Pm = 0.38 and Pw / Pm = 1.5 shown in FIG. 10, the DCJ curve has a sufficient range less than the reference value, and there is no problem. In addition, the asymmetry value has a part exceeding the reference, but there is no problem with linearity. However, for the combination of Ps / Pm = 0.48 and Pw / Pm = 1.9, the DCJ curve has many portions that exceed the reference value. There is also a problem with the linearity of the curve representing the relationship between the asymmetry value and the write power Pw. Therefore, Ps / Pm = 0.48 and Pw / Pm = 1.9 cannot be adopted.

  Next, the verification contents in the range J will be shown using FIG. FIG. 11 shows the relationship between the write power Pw and the DCJ for the combination of Ps / Pm = 0.28 and Pw / Pm = 1.2, and the combination of Ps / Pm = 0.3 and Pw / Pm = 1.3. , The relationship between the write power Pw and the asymmetry value (Asym). The configuration of the graph itself and the reference value are the same as those in FIGS. The combination of Ps / Pm = 0.28 and Pw / Pm = 1.2 does not satisfy the DCJ standard and cannot be adopted. For the combination of Ps / Pm = 0.3 and Pw / Pm = 1.3, there is no problem because the DCJ curve has a sufficient range below the reference value. In addition, asymmetry values are often below the standard, and there is no problem with linearity. Thus, the combination of Ps / Pm = 0.28 and Pw / Pm = 1.2 cannot be adopted.

As described above, if the values of Ps / Pm and Pw / Pm are included in the range F of the bold dotted line in FIG. 7, the relationship between the write power Pw and the asymmetry value is satisfied while satisfying the requirements of the standard. The line is represented by a straight line having a predetermined inclination or more.
7 to FIG. 11, the write power Pw is optimized, the intermediate bias power Pm is determined accordingly, and the space formation power Ps is determined from the intermediate bias power Pm. Become.

[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 The amplitude level at the center position in the length direction of the nT mark becomes a peak value with respect to the characteristic value detection unit 124 that detects the level and the like, and the incomplete frequency response in which the intersymbol interference remains in the digital signal. As a result, the value of the amplitude level affected by the adjacent nT space is set to 7 levels of 0 to 6, for example. From the equalizer 131 for equalizing to the ratio of the above, the data demodulation circuit 123 for decoding the reproduced RF signal waveform-equalized by the equalizer 131 into the most probable standard code sequence, the pickup unit 110, and the control circuit 125 The data modulation circuit 129 that performs predetermined modulation on the output data to be recorded and outputs the data to the laser diode (LD) driver 121, the LD driver 121, the rotation control unit and motor of the optical disc 150, and the pickup unit 110 Servo control circuit 132 and the like. Although not shown, the optical disc recording / reproducing apparatus 100 is connected to a display device or a personal computer, and in some cases, may be connected to a network to communicate with one or a plurality of computers.

  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 the control of the servo control circuit 132, 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 demodulation circuit 123, the data modulation circuit 129, the servo control circuit 132, a rotation 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 (strategy data or the like) 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 equalizer 131 and the data demodulating circuit 123 perform predetermined decoding processing on the output reproduction signal, and the decoded data is sent to the display unit of the input / output system via the control circuit 125 and the I / F 128. Output and display the playback 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 reads out a media ID (which may be manufacturer identification information (Manifuacturer ID)) recorded on the optical disc 150 by playing it through the PD 112, the equalizer 131, and the data demodulation circuit 123. (Step S1). Further, the control circuit 125 acquires data of the recording speed set by the user via, for example, the I / F 128 (step S2). Then, various strategy data corresponding to the acquired recording speed and the read media ID are read from the memory 127 and set in the LD driver 121 (step S3). When the data is recorded not on the memory 127 but on the optical disc 150, various strategy data are read from the optical disc 150. In the case where the recording speed is 4 × or more, or when the media ID is read for an optical disc having a recording layer having an absorption spectrum that can be recorded in the wavelength range of 400 to 410 nm, in this step, the write power Pw And an intermediate bias power Pm and a space forming power Ps determined from the initial value of the write power Pw according to the conditions described in the principle of the present invention are set in the LD driver 121.

  Then, a known process for optimizing the write power Pw is performed (step S5). 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. The control circuit 125 calculates an asymmetry value or β value to calculate an optimum write power Pw. There are many optimization methods that can be used in this step, and any method may be used.

  Thereafter, the control circuit 125 determines the intermediate bias power Pm and the space specified from the optimized write power Pw calculated in step S5 and the write power Pw optimized according to the conditions described in the principle of the present invention. The formation power Ps is set in the LD driver 121, and data recording is performed (step S7).

  By carrying out such processing, the effects described in the column of the principle of the invention can be obtained, and furthermore, the write power Pw can be appropriately controlled also in WOPC (Walking Optimum Power Control) or the like. It becomes like this.

  It should be noted that the conditions themselves and the setting data of Pw, Pm, and Ps that satisfy the conditions as described in the section of the principle of the present invention may be stored in the memory 127 or in the optical disk 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 includes a PIC (Permanent Information & Control Data) area 170, an INFO area, and an OPC area. For example, the PIC 170 holds the conditions themselves as described in the column of the principle of the present invention, and Pw, Pm, Ps, and the like that satisfy the conditions. Note that the BCA, DATA area, and lead-out area are the same as the conventional one.

  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. 12 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.

It is a figure for demonstrating waveforms, such as recording power. It is a figure for demonstrating the parameter conditions based on the principle of this invention. It is a figure which shows the verification content of the parameter conditions based on the principle of this invention. It is a figure which shows the verification content of the parameter conditions based on the principle of this invention. It is a figure which shows the verification content of the parameter conditions based on the principle of this invention. It is a figure which shows the verification content of the parameter conditions based on the principle of this invention. It is a figure for demonstrating the 2nd parameter condition based on the principle of this invention. It is a figure which shows the verification content of the 2nd parameter condition based on the principle of this invention. It is a figure which shows the verification content of the 2nd parameter condition based on the principle of this invention. It is a figure which shows the verification content of the 2nd parameter condition based on the principle of this invention. It is a figure which shows the verification content of the 2nd parameter condition based on the principle of this invention. 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.

Explanation of symbols

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 demodulating circuit 124 Characteristic value detection unit 125 Control circuit 126 Memory circuit 127 Memory 128 I / F 129 Data modulation circuit 131 Equalizer 132 Servo control circuit 150 optical disc

Claims (13)

Reading the media information of the optical disc to be recorded;
In the case where the read media information indicates an optical disc having a recording layer having an absorption spectrum that can be recorded in the wavelength range of 400 to 410 nm, in the intermediate pulse included in the castle type recording pulse waveform The ratio X of the write power Pw in the top pulse and the last pulse included in the castle type recording pulse waveform with respect to the intermediate bias power Pm satisfies the first condition, and the castle type recording pulse waveform with respect to the write power Pw Setting the intermediate bias power Pm, the write power Pw, and the space forming power Ps so that the ratio Y of the space forming power Ps in the included space forming pulse satisfies the second condition;
A data recording method including: The first condition is 1.2 <X <1.9,
The data recording method according to claim 1, wherein the second condition is 0.16 <Y <0.31. Reading the media information of the optical disc to be recorded;
In the case where the read media information indicates an optical disc having a recording layer having an absorption spectrum that can be recorded in the wavelength range of 400 to 410 nm, in the intermediate pulse included in the castle type recording pulse waveform The ratio X of the write power Pw in the top pulse and the last pulse included in the castle type recording pulse waveform with respect to the intermediate bias power Pm satisfies the first condition, and the castle type recording pulse waveform with respect to the intermediate bias power Pm. Setting the intermediate bias power Pm, the write power Pw, and the space forming power Ps so that the ratio Z of the space forming power Ps in the space forming pulse included in the condition satisfies the second condition;
A data recording method including: The first condition is 1.2 <X <1.9,
The data recording method according to claim 3, wherein the second condition is 0.25 <Z <0.47. Means for reading out the media information of the optical disc to be recorded;
In the case where the read media information indicates an optical disc having a recording layer having an absorption spectrum that can be recorded in the wavelength range of 400 to 410 nm, in the intermediate pulse included in the castle type recording pulse waveform The ratio X of the write power Pw in the top pulse and the last pulse included in the castle type recording pulse waveform with respect to the intermediate bias power Pm satisfies the first condition, and the castle type recording pulse waveform with respect to the write power Pw Means for setting the intermediate bias power Pm, the write power Pw and the space forming power Ps so that the ratio Y of the space forming power Ps in the included space forming pulse satisfies the second condition;
An optical disc recording / reproducing apparatus having: The first condition is 1.2 <X <1.9,
The optical disc recording / reproducing apparatus according to claim 3, wherein the second condition is 0.16 <Y <0.31. Means for reading out the media information of the optical disc to be recorded;
In the case where the read media information indicates an optical disc having a recording layer having an absorption spectrum that can be recorded in the wavelength range of 400 to 410 nm, in the intermediate pulse included in the castle type recording pulse waveform The ratio X of the write power Pw in the top pulse and the last pulse included in the castle type recording pulse waveform with respect to the intermediate bias power Pm satisfies the first condition, and the castle type recording pulse waveform with respect to the intermediate bias power Pm. Means for setting the intermediate bias power Pm, the write power Pw and the space forming power Ps so that the ratio Z of the space forming power Ps in the space forming pulse included in the condition satisfies the second condition;
An optical disc recording / reproducing apparatus having: The first condition is 1.2 <X <1.9,
The data recording method according to claim 7, wherein the second condition is 0.25 <Z <0.47.   A program for causing a processor of an optical disc recording / reproducing apparatus to execute the data recording method according to any one of claims 1 to 4. An optical disc including a recording layer having an absorption spectrum that can be recorded in a wavelength range of 400 to 410 nm,
The ratio X of the write power Pw in the top pulse and the last pulse included in the castle type recording pulse waveform to the intermediate bias power Pm in the intermediate pulse included in the castle type recording pulse waveform satisfies the first condition, and the write The intermediate bias power Pm, the write power Pw, and the space forming power such that the ratio Y of the space forming power Ps in the space forming pulse included in the castle type recording pulse waveform to the power Pw satisfies the second condition. An optical disc in which Ps setting data is recorded. The first condition is 1.2 <X <1.9,
The optical disc according to claim 10, wherein the second condition is 0.16 <Y <0.31. An optical disc including a recording layer having an absorption spectrum that can be recorded in a wavelength range of 400 to 410 nm,
The ratio X of the write power Pw in the top pulse and the last pulse included in the castle type recording pulse waveform to the intermediate bias power Pm in the intermediate pulse included in the castle type recording pulse waveform satisfies the first condition, The intermediate bias power Pm, the write power Pw, and the space formation such that the ratio Z of the space formation power Ps in the space formation pulse included in the castle type recording pulse waveform to the bias power Pm satisfies the second condition. An optical disc on which setting data of power Ps is recorded. The first condition is 1.2 <X <1.9,
The optical disk according to claim 12, wherein the second condition is 0.25 <Z <0.47.

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