WO2003023772A1 - Procede d'enregistrement de donnees sur un support d'enregistrement optique, dispositif d'enregistrement de donnees et support d'enregistrement optique - Google Patents

Procede d'enregistrement de donnees sur un support d'enregistrement optique, dispositif d'enregistrement de donnees et support d'enregistrement optique Download PDF

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Publication number
WO2003023772A1
WO2003023772A1 PCT/JP2002/009070 JP0209070W WO03023772A1 WO 2003023772 A1 WO2003023772 A1 WO 2003023772A1 JP 0209070 W JP0209070 W JP 0209070W WO 03023772 A1 WO03023772 A1 WO 03023772A1
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WO
WIPO (PCT)
Prior art keywords
recording
information
recording medium
laser beam
optical recording
Prior art date
Application number
PCT/JP2002/009070
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English (en)
Japanese (ja)
Inventor
Tatsuya Kato
Masanori Shibahara
Original Assignee
Tdk 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
Application filed by Tdk Corporation filed Critical Tdk Corporation
Publication of WO2003023772A1 publication Critical patent/WO2003023772A1/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
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/0055—Erasing

Definitions

  • the present invention relates to a method and apparatus for recording information on an optical recording medium, and more particularly to a method and apparatus for recording information on an optical recording medium suitable for realizing a high data transfer rate. Further, the present invention relates to an optical recording medium, and more particularly, to an optical recording medium capable of recording at a high data transfer rate.
  • Conventional technology for recording information on an optical recording medium, and more particularly to a method and apparatus for recording information on an optical recording medium suitable for realizing a high data transfer rate.
  • the present invention relates to an optical recording medium, and more particularly, to an optical recording medium capable of recording at a high data transfer rate.
  • optical recording media typified by CDs and DVDs have been widely used as recording media for recording digital data.
  • data recording method data to be recorded is recorded along a track.
  • a method of modulating the length of a recording mark is widely used.
  • a laser beam set to the reproduction power is irradiated along the tracks of the optical recording medium, and the reflected light is detected to detect the information of the recording mark. Is read.
  • a laser beam set to a recording power is irradiated along a track of the optical recording medium to form a recording mark having a predetermined length.
  • DVD-RW which is a type of optical recording medium on which data can be rewritten by the user
  • T is one clock cycle
  • a recording laser beam having the same pulse width as the time corresponding to the length of the recording mark to be formed is not applied to the optical recording medium, but rather.
  • the optical recording medium is irradiated with a laser beam having a pulse train pattern of a number determined based on the type of the recording mark to be formed, whereby the laser beam has a predetermined length. Is formed.
  • the number of n-1 or n-2 (n is the type of recording mark and has a value of 3 to 11 or 14) Are continuously irradiated, thereby forming any recording mark having a length corresponding to 3T to 11 and 14 pieces.
  • one pulse is used to form a recording mark having a length corresponding to 3 ⁇ , and a recording mark having a length corresponding to 11 1 is formed. If so, nine pulses would be used.
  • two pulses are used to form a recording mark having a length corresponding to 3 ⁇ , and a recording mark having a length corresponding to 11 1 is used. When forming, 10 pulses will be used.
  • the erasure rate is defined as the difference between the CNR (carrier / noise ratio) when a single signal is recorded and the CNR after irradiating a laser of a certain power to the single signal. If this is low, the jitter will be high.
  • the erasure rate decreases when the data transfer rate is increased to about 35 Mbps, and the erasure rate decreases significantly when the data transfer rate is increased to about 6 OM bps. Resulting in.
  • an object of the present invention is to provide an improved information recording method and an improved information recording apparatus on an optical recording medium.
  • Another object of the present invention is to provide a method and apparatus for recording information on an optical recording medium suitable for realizing a high data transfer rate.
  • Another object of the present invention is to provide an optical recording medium capable of recording at a high data transfer rate.
  • Still another object of the present invention is to provide an information recording method for an optical recording medium capable of sufficiently erasing old recording data when a new recording mark is directly overwritten on a recording mark that has already been written. It is to provide an information recording device.
  • An object of the present invention is a method for recording information on an optical recording medium, which records information by irradiating a recording layer of the optical recording medium with a laser beam, wherein an area of the recording layer where information is to be recorded is reserved. This is achieved by a method for recording information on an optical recording medium, characterized in that information is recorded by irradiating a laser beam for recording onto the area after a temporary erasure state.
  • the preliminary erased state indicates an intermediate state between a recorded state and an unrecorded state.
  • the recording layer is a phase change film
  • the preliminary erased state refers to a state in which the phase change film is crystallized to some extent.
  • the information is recorded by setting the data transfer rate to 35 Mbs or more.
  • the information is recorded by setting the data transfer rate to 6 OMbps or more.
  • the object of the present invention is also an information recording apparatus for recording information by irradiating a recording layer of an optical recording medium with a laser beam, wherein an area of the recording layer where information is to be recorded is preliminary erased.
  • an information recording device comprising: first means for setting a state; and second means for recording information by irradiating a recording laser beam to the area.
  • the first means includes an erasing head capable of irradiating the optical recording medium with an erasing laser beam
  • the second means includes: Includes recording heads that can be irradiated on recording media.
  • an area where information is to be recorded is in an erased state by using an erase head separate from a recording head, so that the data recording speed is reduced. There is no.
  • the object of the present invention is also an optical recording medium having at least a recording layer and recording information by forming a plurality of recording marks on the recording layer, wherein the information is recorded in the recording layer.
  • An optical recording medium having setting information necessary for recording the information by irradiating a laser beam for recording to the area after setting an area to be erased in a preliminary erasing state. Achieved by
  • the apparatus further includes setting information necessary for setting the data transfer rate to 35 Mbps or more and recording the information.
  • FIG. 1 is a diagram schematically showing a main part of an information recording apparatus according to a preferred embodiment of the present invention.
  • FIG. 2 is a sectional view schematically showing the structure of the optical recording medium 1 according to a preferred embodiment of the present invention.
  • FIG. 3 is a diagram showing a pulse train pattern (recording strategy) when a recording mark having a length corresponding to 2T is formed.
  • FIG. 1 is a diagram schematically showing a main part of an information recording apparatus according to a preferred embodiment of the present invention.
  • the information recording apparatus includes a spindle motor 2 for rotating an optical recording medium 1 and a recording head 3 for irradiating the optical recording medium 1 with a recording laser beam.
  • Erasing head 10 for irradiating the optical recording medium 1 with a laser beam for erasing
  • a controller 4 for controlling the operations of the spindle motor 2, the recording head 3 and the erasing head 10, and a recording head.
  • a laser driving circuit 5 for supplying a laser driving signal to the head 3 and the erasing head 10; and a lens driving circuit 6 for supplying a lens driving signal to the recording head 3 and the erasing head 10. I have.
  • the controller 4 includes a focus servo tracking circuit ⁇ , a tracking servo tracking circuit 8, and a laser control circuit 9.
  • the focus servo tracking circuit 7 When the focus servo tracking circuit 7 is activated, the recording surface of the rotating optical recording medium 1 is in focus, and when the tracking servo tracking circuit 8 is activated, the optical recording medium is activated.
  • the spot of the laser beam automatically follows the eccentric signal track of the body 1.
  • the focus servo tracking circuit 7 and the tracker servo tracking circuit 8 are provided with an auto gain control function for automatically adjusting the focus gain and an auto gain control function for automatically adjusting the tracking gain.
  • the laser control circuit 9 is a circuit for generating a laser drive signal supplied by the laser drive circuit 5, and generates an appropriate laser drive signal based on the recording condition setting information recorded on the optical recording medium 1.
  • the recording condition setting information refers to various conditions necessary for recording data on the optical recording medium 1, for example, the power of a recording laser beam.
  • the recording condition setting information not only information specifically indicating the conditions required for data recording, but also any of various conditions stored in the information recording device in advance is used to specify the recording conditions. This also includes those that specify the above.
  • the erasing head 10 is a dedicated head for previously setting an area of the optical recording medium 1 in which data is to be recorded to a preliminary erasing state.
  • the erasing head 10 irradiates the laser beam for erasing to a portion corresponding to the portion upstream of the portion irradiated with the recording laser beam by the erasing head 10.
  • the “preliminary erased state” means an intermediate state between a recorded state and an unrecorded state, and includes a state in which a mark remains unerased, a group of microcrystals, and a state in which a crystal grows from an amorphous state.
  • the phase change film in the unrecorded state is a crystalline phase and the phase change film in the recorded state is an amorphous phase, it means that such a phase change film is crystallized to some extent as compared to the recorded state. . Therefore, the capability of the erasing head 10 does not require that the area of the optical recording medium 1 where data is to be recorded be completely erased (unrecorded) in advance, and that the erasing laser beam be used. It is sufficient if the area is closer to the erased state (unrecorded state) than before the irradiation. However, it is preferable that the erasing head 10 has the ability to achieve a more complete erasing state. Les ,.
  • FIG. 2 is a sectional view schematically showing the structure of the optical recording medium 1 according to the present embodiment.
  • the optical recording medium 1 has a substrate 11 having a thickness of about 1.1 mm, a reflective layer 12 having a thickness of about 10 to 300 nm, and a thickness of about 10 to 300 nm.
  • a second dielectric layer 13 having a thickness of about 10 to 50 nm; a recording layer 14 having a thickness of about 5 to 30 nm; and a first dielectric layer having a thickness of about 30 to 300 nm. It comprises a body layer 15 and a light transmitting layer 16 having a thickness of about 50 to 150 ⁇ m.
  • a hole 17 is provided in the center of the optical recording medium 1.
  • the distance between the objective lens, which is a part of the recording head 3 and converges the recording laser beam, and the surface of the optical recording medium 1 (working The distance is set to be very narrow (for example, about 80 to 150 / xm), thereby achieving an extremely small beam spot diameter as compared to the conventional one.
  • the optical recording medium 1 having such a structure can realize a large capacity and a high data transfer rate.
  • the optical recording medium 1 stores the above-described recording condition setting information.
  • the recording condition setting information may be recorded as a wobbled prep, or may be recorded on the recording film 14 as data.
  • the recording layer 14 of the optical recording medium 1 is composed of a phase change film, and the recording of data is performed by utilizing the difference between the reflectivity in a crystalline state and the reflectivity in an amorphous state. Done. Specifically, the state of the recording layer 14 in the unrecorded area is a crystalline state, and therefore, its reflectance is, for example, 20%. When any data is recorded in such an unrecorded area, the recording layer 1 is recorded according to the data to be recorded. After heating a predetermined portion of 4 to a temperature exceeding the melting point, it is rapidly cooled to change to an amorphous state. The reflectance in the amorphous state portion is, for example, 7%, whereby the predetermined data is recorded.
  • the recording layer 14 where the data to be overwritten is recorded is heated to a temperature higher than the crystallization temperature or higher than the melting point according to the data to be recorded. Change to a crystalline or amorphous state.
  • the power Pw of the recording laser beam irradiated when melting the recording layer 14 the power Pb of the recording laser beam irradiated when cooling the recording layer 14, and the recording layer 14
  • the controller 4 emits the light from the recording head 3 via the laser control circuit 9 based on the recording condition setting information read from the optical recording medium 1.
  • the laser drive circuit 5 is controlled so that the power of the recording laser beam becomes Pw, Pe, or Pb, and based on this, the laser drive circuit 5 controls the power of the laser drive signal.
  • the powers Pw, Pe, and Pb of the recording laser beam are set to 6. OmW, 2.8 mW, and 0.1 mW, respectively.
  • the controller 4 controls the power of the erasing laser beam emitted from the erasing head 10 via the laser control circuit 9 to Pe.
  • the laser driving circuit 5 is controlled so that The power Pe of the erasing laser beam is similar to the power Pe of the recording laser beam, and is, for example, 2.8 mW.
  • the information recording method according to the present embodiment employs a (1, 7) RLL modulation method, that is, a method of modulating data to be recorded into recording marks having a length corresponding to 2 to 8T. I have.
  • the application of the information recording method according to the present invention is limited to the case where such a modulation method is used. Of course, it is needless to say that the present invention is applicable even when another modulation method is used.
  • the method of irradiating a recording laser beam for forming a recording mark that is, the setting of the number of pulses of the recording laser beam, the pulse width of each pulse, the pulse interval, the power of the pulse, and the like are referred to as a “pulse train Pattern ".
  • the recording condition setting information stored in the optical recording medium 1 includes a content for determining what pulse train pattern should be used to record data, and the information recording device shown in FIG. Performs data recording based on a pulse train pattern described in detail below based on the determination.
  • FIG. 3 is a diagram showing a pulse train pattern when a recording mark having a length corresponding to 2T is formed.
  • the power of the erasing laser beam emitted from the erasing head 10 is set to Pe
  • the recording layer 14 of the recording medium 1 is irradiated to a position where a recording mark is to be formed, and then a recording laser beam emitted from the recording head 3 is irradiated to the position.
  • the number of pulses of the recording laser beam is set to “1”.
  • the number of pulses of the recording laser beam is defined by the number of times that the power of the recording laser beam is increased to Pw.
  • the timing at which the recording laser beam is located at the start point of the recording mark is time ts
  • the timing at which the recording laser beam is located at the end point of the recording mark is time te
  • the time from time ts to time te is time te
  • the power of the recording laser beam is once set to Pw, and then to the normal Pb.
  • the power of the recording laser beam before time t s is set to Pe
  • the rise of the recording laser beam is started at time t s.
  • the power of the recording laser beam at the time U Te is set to Pe or Pb.
  • the period from the time t 21 to the time t 22 shown in FIG. 3 is defined as T top (2T), and the period from the time t 22 to the time t 23 is T c 1
  • Ttop (2T) is set to about 0.6T
  • T c 1 (2T) is set to about 0.7 ⁇ .
  • the time t 21 is the timing when the power of the recording laser beam exceeds (Pw + P e) / 2
  • the time t 22 is when the power of the recording laser beam is The timing is lower than (Pw + Pb) / 2
  • the time t23 is the timing when the power of the recording laser beam exceeds (Pe + Pb) 2.
  • the recording layer 14 of the optical recording medium 1 receives high energy and its temperature exceeds the melting point, and the period of T c 1 (2T) (cooling period) In, the recording layer 14 of the optical recording medium 1 is rapidly cooled. As a result, a recording mark having a length corresponding to 2T is formed on the recording layer 14 of the optical recording medium 1.
  • the recording layer 14 of the optical recording medium 1 is preliminarily prepared by the erasing laser beam emitted from the erasing head 10. Since the erased state is a good one, it is possible to overwrite a good signal even when an old recorded mark exists in a portion where such a recorded mark is formed.
  • the formation of a recording mark with a length corresponding to 3 T to 8 mm is the same as the case of forming a recording mark with a length corresponding to 2 mm above, and the recording head emitted from the recording head 3 Prior to the laser beam irradiation, the recording layer 14 of the optical recording medium 1 is put into a preliminary erasing state by the erasing laser beam emitted from the erasing head 10, thereby overwriting a good signal. can do.
  • the recording layer 14 of the optical recording medium 1 is preliminary erased by using the erasing laser beam emitted from the erasing head 10.
  • the state makes it possible to obtain a very high erasure rate. Therefore, to achieve a data transfer rate of 35 Mbps or more, especially a data transfer rate of 60 Mbps or more, low jitter can be obtained even when the clock cycle is set very short. It becomes possible.
  • an erasing head separate from the recording head 3 is used. Since the erasing laser beam is irradiated using 10, the data recording speed does not decrease. In this case, it is sufficient for the erasing head 10 to irradiate the erasing laser beam upstream of the portion irradiated with the recording laser beam, so that the erasing head 10 is shared with the recording head 3. Because it can be incorporated into the drive system, the entire device is not significantly increased in size-without complicating it.
  • the erasing laser beam is irradiated using the erasing head 10 that is separate from the recording head 3, but in the present invention, the erasing laser beam is radiated separately from the recording head 3. It is not essential to use the erasing head 10 of the optical recording medium 3, and after irradiating the erasing laser beam using the recording head 3 to bring the recording layer 14 of the optical recording medium 1 into a preliminary erasing state, The recording mark may be formed at the corresponding position by using the recording head 3 again. In this case, since the number of components of the information recording device does not increase, it is possible to suppress an increase in cost.
  • the erasing power of the erasing laser beam and the erasing power of the recording laser beam are both set to Pe, but in the present invention, it is not essential that both are completely matched. .
  • the power of the recording laser beam is set in three stages of Pw, Pe, and Pb, but this may be set in two stages.
  • the power P e of the recording laser beam is set to be higher than the power P b of the recording laser beam, but they may be set to the same power.
  • the power of the recording laser beam may be set to four or more levels.
  • the optical recording medium 1 shown in FIG. 2 has been described as an optical recording medium suitable for applying the information recording method to the optical recording medium according to the above embodiment. It is not limited to such optical recording media, and any optical recording media on which information can be rewritten can be used. It is also applicable to various optical recording media. Therefore, for example, when the recording layer of the optical recording medium 1 is made of a phase change film, the unrecorded state is an amorphous phase, and the recorded state is a crystalline phase, the phase change film is changed to the recorded state ( (A crystalline phase). As described above, according to the present invention, it is possible to provide an optical recording medium, a method of recording information on an optical recording medium, and an information recording apparatus suitable for realizing a high data transfer rate.
  • Example 1 it is possible to provide an optical recording medium, a method of recording information on an optical recording medium, and an information recording apparatus suitable for realizing a high data transfer rate.
  • the thickness of the substrate 11 is 1.1 mm
  • the thickness of the reflective layer 12 is 150 nm
  • the thickness of the second dielectric layer 13 is Is 40 nm
  • the thickness of the recording layer 14 is 15 nm
  • the thickness of the first dielectric layer 15 is 40 nm
  • the thickness of the light transmitting layer 16 is 100 nm.
  • An optical recording medium 1 of m was prepared.
  • a recording mark having a length corresponding to 2 T to 8 mm is formed under the conditions # 1 to # 3 shown in Table 1 by the (1,7) RLL modulation method.
  • a mixed signal was formed.
  • Table 2 shows the power of the recording laser beam used in the condition ## 3.
  • the mixed signal is irradiated with an erasing laser beam at the same linear velocity as that used for data recording.
  • a mixed signal was formed, and its jitter (Jitter 2) was measured.
  • the jitter after overwriting data shows a very low value (less than 8%) under all conditions.
  • a new mixed signal was directly formed (direct overwrite) in the area where the mixed signal was first formed without irradiating the erasing laser beam.
  • the conditions for recording are the same as for the first recording.
  • the jitter (Jitter3) of the new mixed signal was measured.
  • Table 5 shows the measurement results.
  • this single signal is irradiated with an erasing laser beam at the same linear velocity as during data recording, and then the CNR (CNR 2) is measured, and the erasing rate (CNR 1—C NR 2) is calculated. Calculated. ⁇ and the results are shown in Table 7 Table 7

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Abstract

L'invention concerne un procédé amélioré d'enregistrement de données sur un support d'enregistrement optique, qui permet d'enregistrer des données par application d'un faisceau laser sur la couche d'enregistrement (14) d'un support d'enregistrement optique (1). Le procédé consiste à définir une condition préalable d'effacement dans une zone d'enregistrement de données de la couche d'enregistrement (14), puis à appliquer un faisceau laser d'enregistrement sur cette zone. Ce procédé peut améliorer sensiblement la qualité d'effacement lorsque des données sont écrasées pour permettre une bonne gigue. Pour définir une condition préalable d'effacement, il suffit d'appliquer un faisceau laser d'effacement, de puissance identique à celle d'un faisceau laser d'enregistrement, avant l'application du faisceau laser d'enregistrement.
PCT/JP2002/009070 2001-09-10 2002-09-05 Procede d'enregistrement de donnees sur un support d'enregistrement optique, dispositif d'enregistrement de donnees et support d'enregistrement optique WO2003023772A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2001273876A JP2003085766A (ja) 2001-09-10 2001-09-10 光記録媒体への情報記録方法、情報記録装置及び光記録媒体
JP2001-273876 2001-09-10

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61276127A (ja) * 1985-05-31 1986-12-06 Fujitsu Ltd 光デイスクの記録方法
JPH02177131A (ja) * 1988-12-28 1990-07-10 Matsushita Electric Ind Co Ltd 光学記録媒体の記録消去方法および記録消去装置

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000187882A (ja) * 1998-02-24 2000-07-04 Sony Corp 光記録媒体

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61276127A (ja) * 1985-05-31 1986-12-06 Fujitsu Ltd 光デイスクの記録方法
JPH02177131A (ja) * 1988-12-28 1990-07-10 Matsushita Electric Ind Co Ltd 光学記録媒体の記録消去方法および記録消去装置

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