WO2003069603A1 - Procede d'enregistrement pour support d'enregistrement de donnees et dispositif d'enregistrement/reproduction de donnees - Google Patents

Procede d'enregistrement pour support d'enregistrement de donnees et dispositif d'enregistrement/reproduction de donnees Download PDF

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Publication number
WO2003069603A1
WO2003069603A1 PCT/JP2003/001530 JP0301530W WO03069603A1 WO 2003069603 A1 WO2003069603 A1 WO 2003069603A1 JP 0301530 W JP0301530 W JP 0301530W WO 03069603 A1 WO03069603 A1 WO 03069603A1
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WO
WIPO (PCT)
Prior art keywords
recording
pulse
information recording
length
mark
Prior art date
Application number
PCT/JP2003/001530
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English (en)
Japanese (ja)
Inventor
Masatsugu Ogawa
Original Assignee
Nec Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Publication of WO2003069603A1 publication Critical patent/WO2003069603A1/fr

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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
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
    • G11B7/126—Circuits, methods or arrangements for laser control or stabilisation
    • 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

Definitions

  • the present invention relates to a recording method and a recording / reproducing apparatus for a high-density optical disk.
  • a write-once type (one-time recording type) optical disc called DVD-R is being introduced to the market.
  • This disk has grooves (concavities and convexities) formed in a spiral shape, and the light spot scans a portion called a group (a convex portion when viewed from the optical head side).
  • a pit called a land pre-pit (LPP) is formed in a portion called a land next to the group (a concave portion as viewed from the optical head side).
  • LPP land pre-pit
  • various information necessary for recording is embedded. When performing recording and reproduction with a drive, it is important to obtain information from the LPP without error. .
  • DVD-R employs a modulation code called EFM plus, which has a length of 3T, 4 ⁇ , 5 ⁇ , 6 ⁇ , 7 ⁇ , 8 ⁇ , 9 ⁇ , 10 ⁇ , 11 ⁇ , 14 ⁇ ( ⁇ : channel clock period). Consists of marks and spaces.
  • the DVD-R recording method uses a multi-pulse type pulse as shown in FIG. Since a recording method on an optical disk is generally called a recording strategy, in this specification, the recording method is called a recording strategy. In the case of DVD-R, an n-2 type multi-pulse type recording strategy is adopted. When recording a mark of length nT, recording is performed with ⁇ _2 pulses. For example, recording 3 mm would be done with one pulse, and 5 mm would be done with 3 pulses. Since the output of LPP is proportional to the amount of light returned from DVD-R, if a long mark or thick mark is formed next to LPP, the LPP output will decrease significantly. This will increase the number of errors in reading the LPP, so it is desirable that the marks recorded in the group have an appropriate thickness.
  • Fig. 3 shows the playback signal (eyepan) when a random pattern is recorded. Normal modulation is calculated from the formula I14HZI14.
  • I14HZI14 1x speed drive that records and reproduces data at a linear speed of 3 ⁇ 49 m / s in the market, but devices and discs that can record at higher speeds are required.
  • Figure 4 shows the results of measuring the relationship between the LPP error rate and the modulation when high linear velocity recording was performed.
  • the modulation value increases as the linear velocity increases, and the error rate of LPP increases accordingly. This means that if recording is performed at a high linear velocity, then it will not be possible to obtain various information such as address information from the PP, which is expected to be a very serious problem for drives. .
  • Japanese Patent Application Laid-Open No. Hei 5-197979 is mentioned.
  • the shape of the recording mark is controlled by forming two pulses at the front end and the rear end of the mark, and arranging a pulse or recording power level narrower than the two between them.
  • the present invention is limited to an embodiment using a modulation method having only four types of mark lengths. It is not shown, and no knowledge can be obtained for a modulation method with 10 types of mark lengths, such as EFM plus.
  • there is a description that short marks are recorded as input modulation signals as they are, but no information can be obtained on how far the input signals should be recorded as they are.
  • the above-mentioned invention does not suggest what to do specifically for DVD-R using a modulation code of EFM plus. Disclosure of the invention
  • an object of the present invention is to provide a recording strategy that enables both formation of a good recording mark and accurate reading of LPP information in a write-once optical disc, particularly in DVD-R.
  • a mark having a length of 5 T or less (T is a channel clock cycle) is formed by one pulse having a different length.
  • marks having a length of 5 T or less are each one pulse having a different length and one type.
  • the present invention provides a recording method for an information recording medium, in which a signal having a recording length other than the above is recorded by a pulse having at least two or more recording power levels.
  • the EFM plus modulation code used in DVD-R or the like is a signal of length nT ( ⁇ : channel clock) ( ⁇ is 3, 4, 5, 6, 7, 8, 9, 10, 10, 11, or 14) based on a channel clock with period T.
  • nT channel clock
  • T channel clock with period T.
  • the recording method for an information recording medium of the present invention is a method for recording a signal in which ⁇ is 6 or more. In that case, it is also desirable to use n-4 pulses.
  • the pulse used when recording a signal in which n is 6 or more is a first region having a length four times as long as the channel clock.
  • the first area is constituted by one pulse
  • the second area is constituted by one or n-6 pulses
  • the third area is constituted by one pulse.
  • the recording power level at the front end and the rear end of the pulse is higher than the recording power level at the area between the front end and the rear end.
  • the wavelength of the light emitted from the laser diode of the light head to be used is determined when the numerical aperture of the objective lens is NA. , 0.61 ⁇ ⁇ ⁇
  • the present invention further provides an information recording / reproducing apparatus having recording means for recording on an information recording medium, wherein the information recording / reproducing apparatus uses the above-described recording method for an information recording medium as a recording means.
  • FIG. 1 is a timing chart of a pulse used in the recording method of the present invention.
  • FIG. 2 is a timing chart of a pulse used in a conventional recording method.
  • FIG. 3 is a waveform diagram showing the definition of modulation.
  • FIG. 4 is a graph showing the dependence of the LPP error and the modulation on the recording linear velocity.
  • FIG. 5 is a graph showing the Tmp dependence of the jitter when a short mark is recorded with one pulse.
  • FIG. 6 is a graph showing the Tmp dependency of the modulation when a short mark is recorded with one pulse.
  • FIG. 7 is a graph showing the relationship between the number of Tmps to be coupled and the jitter at the front end of the mark (front edge jitter) when the Tmp connected to the Ttop is coupled.
  • Fig. 8 is a graph showing the relationship between the number of Tmps to be combined and the zip at the end of the mark (rear edge zip) when the Tmp before the last Tmp is combined.
  • FIG. 9 is a graph showing the relationship between the jitter and Tmp when the recording method of the present invention is used.
  • FIG. 10 is a graph showing the relationship between LPP errors and modulation and Tmp when the recording method of the present invention is used.
  • FIG. 11 is a table showing an example of various parameter settings in the recording method of the present invention.
  • FIG. 12 is a timing chart showing pulses in one embodiment of the recording method of the present invention.
  • FIG. 13 is a timing chart showing pulses in one embodiment of the recording method of the present invention.
  • FIG. 14 is a table showing an example of various parameter settings in the recording method of the present invention.
  • Fig. 15 is a table showing the linear velocity dependence of various parameters in the conventional recording method.
  • FIG. 16 is a graph showing the linear velocity dependence of jitter when the recording method of the present invention is used.
  • FIG. 17 is a block diagram showing an example of the information recording / reproducing apparatus of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION
  • FIG. 1 shows an outline of a recording strategy of the present invention, and the vertical axis is proportional to the laser output level.
  • the pulse train of the mark of 6 mm or more is composed of the first pulse part of 4 mm length, the multi-pulse part of ( ⁇ -6) ⁇ (not present in the case of 6 mm), It is also characterized by a last pulse section.
  • the parameter set consists of five sets: T start to control the time from the start of the NRZI signal to be recorded to the rise of the first pulse, T ie to control the fall position of the first pulse, and the multi-pulse section. Tmp to control the pulse width of the last pulse, Tls to control the rising position of the last pulse, and Tend to control the falling position of the last pulse.
  • T start to control the time from the start of the NRZI signal to be recorded to the rise of the first pulse
  • T ie to control the fall position of the first pulse
  • Tmp to control the pulse width of the last pulse
  • Tls to control the rising position of the last pulse
  • Tend to control the falling position of the last pulse.
  • the recording strategy of the present invention was derived from the following detailed experiments.
  • the heat of the second and subsequent Tmp does not affect the leading edge, and if the modulation is adjusted by manipulating the second and subsequent Tmp, the leading edge will be affected. It is thought that the modulation can be adjusted without giving the user.
  • the conventional multi-pulse type strategy consists of a region with a length of 3 times, the first pulse is controlled as a unit with a region of 4 T in length. It can be concluded that it is desirable.
  • FIG. 8 shows the results.
  • the horizontal axis indicates the number of Tmps connected to the last Tmp before the last Tmp.
  • the jitter does not increase.
  • the heat of the third or later Tmp does not affect the trailing edge, and if the modulation is adjusted by manipulating the third or later Tmp, the trailing edge is affected. It can be adjusted without giving From the above, it is considered that it is desirable that the last pulse be controlled with a region consisting of 2 T in length as one unit.
  • the recording strategy of the present invention is derived from all the experimental results described above. Therefore, it is possible to tweak the modulation and modulation independently.
  • the Tm of the present invention exists only for adjusting the modulation and does not thermally affect the leading and trailing edges, so that various forms are conceivable.
  • a strategy that translates the position of Tmp in parallel, or a strategy that combines several Tmps into one Tmp can be considered.
  • a strategy in which the first pulse and the last pulse are connected at a different recording power level from both pulses is also conceivable.
  • recording is performed with one pulse for 5 T or less, not only one type of recording power level as described above, but also two or more types by changing the recording power level in the front end area and rear end area of the pulse
  • one pulse composed of the recording power levels is also conceivable.
  • the recording strategy of the present invention was devised, but it has been found that the recording strategy of the present invention has a very close relationship with the light beam spot diameter.
  • equation (1) can be considered as the light beam radius.
  • the optical head used in the above experiments has an optical wavelength of 660 nm and a numerical aperture of the objective lens of 0.6. That is, the light beam radius calculated from the above equation is 0.67 lm.
  • the 5T mark recorded on DVD-R this time has a channel clock frequency of 104.64 MHz at a linear velocity of 13.96 m / s, and thus has a length of 0.667 zm. This is about the same length as the light beam radius.
  • the effect of the present invention can be obtained by recording a recording mark having substantially the same length as the light beam radius and a recording mark having a mark length shorter than that by a single pulse.
  • recording should be performed with a single pulse up to the mark length where optical interference with adjacent marks greatly affects the reproduction of the self-mark. Therefore, if the mark length to be recorded by one pulse is determined using equation (1), the present invention can be applied to a combination of an optical head having various laser wavelengths and a recording density. You can do it.
  • Fig. 9 shows the measurement of the margin against Tmp. It can be seen that a very wide margin was obtained.
  • FIG. 10 shows the relationship between the modulation of T mp and the error rate of LPP. It can be seen that when Tmp is set to 0.5T or less, the LPP error becomes good. From Fig.
  • an optical head having an optical wavelength of 660 nm and a numerical aperture (NA) of 0.6 is used.
  • an optical head having an optical wavelength of 660 nm and a numerical aperture (NA) of 0.6 is used as in the above embodiment.
  • Tms and Tme are used instead of Tmp as a parameter of the multipulse section.
  • Tms means the rising position of the pulse in the multi-pulse part
  • Tme means the falling position of the pulse in the multi-pulse part.
  • the pulse of the multi-pulse section of 8 T or more is extended by 1 T every time the mark becomes longer, and the pulse existing in the multi-pulse section becomes one.
  • the recording linear velocity is 13.96 m / s, which is equivalent to 4x speed
  • the channel clock is 104.64 MHz.
  • the playback speed is 3.49m / s, which is equivalent to 1x speed
  • the channel clock was set at 26.16 MHz.
  • the same results as in Example 1 were obtained, confirming the effectiveness of the present invention.
  • the parameters used are shown in Figure 14.
  • the optimum recording power was about 18 mW.
  • an optical head having an optical wavelength of 660 nm and a numerical aperture (NA) of 0.6 is used as in the above embodiment.
  • the recording strategy of the present invention also has the following great advantages because the first pulse section and the multi-pulse section and the last pulse section are thermally independent.
  • T top and Tmp when the linear velocity is changed, T top and Tmp must be changed as shown in FIG. This is because the thermal relationship between T top and T mp changes when the linear velocity changes, which must be corrected.
  • FIG. 16 shows the relationship between the jitter and the linear velocity when the recording strategy of the present invention is used.
  • the recording strategy shape is the same as in Example 1, and the parameters use the same values as in FIG.
  • the zipper is always good even when the linear velocity is changed. In other words, it can be seen that a wide linear velocity can be covered with the same strategy.
  • CAV recording in which recording is performed at a constant spindle speed, can be easily performed.
  • the spindle speed will determine the limit of the linear velocity. At that time, it can be easily inferred that the present invention further increases its importance.
  • an optical head having an optical wavelength of 660 nm and a numerical aperture (NA) of 0, 6 is used.
  • NA numerical aperture
  • the information recording / reproducing apparatus of the present invention comprises an optical disc medium 11 and a laser Recording means having a diode (LD) drive system 12 and a laser diode 13; information reproducing means having a photodetector 14; and a recording / reproducing condition setting mechanism 15 for setting recording conditions or reproducing conditions.
  • the recording / reproducing condition setting mechanism 15 has a portion for detecting a reproduced signal, a portion for setting recording / reproducing conditions from the reproduced signal, and a portion for executing the set recording / reproducing condition.
  • the LD drive system 12 emits the laser diode 13 based on the set recording and reproduction conditions.
  • the optical disk 11 is rotated by the spindle drive system 16, and the information recorded on the optical disk 11 passes through the objective lens 17 as reflected light of the light radiated by the laser diode 13, and the light is detected.
  • Detected by detector 14 The information detected by the photodetector 13 is sent to a higher-level processing system as a reproduction signal.
  • the reproduction signal is also distributed to the recording / reproducing condition setting mechanism 15, and the recording / reproducing condition setting mechanism 15 can check the recording / reproducing conditions based on the information. If the recording / reproducing conditions are changed using the detected information, better recording / reproducing can be performed.
  • the recording condition setting mechanism 15 realizes various recording methods of the present invention.
  • the information recording / reproducing apparatus of the present invention can perform highly reliable recording / reproducing.
  • the number, position, shape, and the like of the constituent members are not limited to the above-described embodiment, and can be set to a number, position, shape, and the like suitable for carrying out the present invention.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

Ce procédé consiste à enregistrer une marque courte sur un disque optique non réinscriptible conformément à un code de modulation au moyen d'une impulsion, et une marque longue au moyen d'au moins deux impulsions ou d'une impulsion comprenant au moins deux niveaux. Plus spécifiquement, ce procédé comprend l'enregistrement d'une marque présentant une longueur égale ou inférieure à 5 T (T représentant une horloge à canal) au moyen d'un procédé de modulation EFM-Plus utilisant une seule impulsion, et d'une marque présentant une longueur égale ou supérieure à 6 T au moyen d'au moins deux impulsions. Ce procédé permet de produire une marque enregistrée de bonne qualité même lorsque l'enregistrement est effectué à une vitesse linéaire élevée, et d'empêcher la dégradation des données du disque gravées dans le substrat.
PCT/JP2003/001530 2002-02-15 2003-02-14 Procede d'enregistrement pour support d'enregistrement de donnees et dispositif d'enregistrement/reproduction de donnees WO2003069603A1 (fr)

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JP2002038440A JP2003242646A (ja) 2002-02-15 2002-02-15 情報記録媒体の記録方法及び情報記録再生装置
JP2002/38440 2002-02-15

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101826334B (zh) * 2006-04-28 2012-02-15 夏普株式会社 信息记录介质、记录重放装置及其记录标记形成方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3977740B2 (ja) * 2002-12-27 2007-09-19 株式会社リコー 相変化型光記録媒体とその記録方法
CN101427308B (zh) * 2006-04-28 2011-02-16 夏普株式会社 记录参数设定装置、记录参数设定程序、记录有该程序的计算机可读取的记录介质、信息记录介质、记录重放装置和记录参数设定方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63160017A (ja) * 1986-12-23 1988-07-02 Yamaha Corp 光デイスク記録装置
JPH08124161A (ja) * 1994-10-21 1996-05-17 Sony Corp 光ディスク記録装置
JPH09305971A (ja) * 1996-03-12 1997-11-28 Ricoh Co Ltd 情報記録方式及び情報記録再生装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63160017A (ja) * 1986-12-23 1988-07-02 Yamaha Corp 光デイスク記録装置
JPH08124161A (ja) * 1994-10-21 1996-05-17 Sony Corp 光ディスク記録装置
JPH09305971A (ja) * 1996-03-12 1997-11-28 Ricoh Co Ltd 情報記録方式及び情報記録再生装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101826334B (zh) * 2006-04-28 2012-02-15 夏普株式会社 信息记录介质、记录重放装置及其记录标记形成方法
CN101826335B (zh) * 2006-04-28 2012-02-29 夏普株式会社 信息记录介质、记录重放装置和记录标记形成方法

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