WO2003034411A1 - Procede et appareil permettant d'initialiser un support d'enregistrement optique de type a couche d'enregistrement multicouches - Google Patents

Procede et appareil permettant d'initialiser un support d'enregistrement optique de type a couche d'enregistrement multicouches Download PDF

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Publication number
WO2003034411A1
WO2003034411A1 PCT/JP2002/010497 JP0210497W WO03034411A1 WO 2003034411 A1 WO2003034411 A1 WO 2003034411A1 JP 0210497 W JP0210497 W JP 0210497W WO 03034411 A1 WO03034411 A1 WO 03034411A1
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WO
WIPO (PCT)
Prior art keywords
layer
recording medium
optical recording
layers
initialized
Prior art date
Application number
PCT/JP2002/010497
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English (en)
Japanese (ja)
Inventor
Tsuyoshi Komaki
Tetsuro Mizushima
Jiro Yoshinari
Original Assignee
Tdk Corporation
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Publication date
Application filed by Tdk Corporation filed Critical Tdk Corporation
Publication of WO2003034411A1 publication Critical patent/WO2003034411A1/fr

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Classifications

    • 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
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/26—Apparatus or processes specially adapted for the manufacture of record carriers
    • 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
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/2403—Layers; Shape, structure or physical properties thereof
    • G11B7/24035—Recording layers
    • G11B7/24038—Multiple laminated recording layers
    • 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
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/26—Apparatus or processes specially adapted for the manufacture of record carriers
    • G11B7/268—Post-production operations, e.g. initialising phase-change recording layers, checking for defects
    • 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
    • G11B2007/0003—Recording, reproducing or erasing systems characterised by the structure or type of the carrier
    • G11B2007/0009—Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage
    • G11B2007/0013—Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage for carriers having multiple discrete layers

Definitions

  • the present invention relates to a multilayer recording layer type optical recording medium in which a plurality of layers each including a recording layer initialized by light irradiation are laminated on one surface side of a substrate and a spacer layer is formed between each layer.
  • the present invention relates to an initialization method and an initialization device. Background art
  • Optical recording media are noted for their high density and large capacity, and are used for various purposes.
  • rewritable optical recording media that allow erasing and re-recording of recorded information can be used to restore and update data, and can be repeatedly rewritten and used, contributing to expanding the use of optical recording media. It is expected to do.
  • a magneto-optical recording medium (MO) and a phase change optical recording medium have been developed and commercialized.
  • optical recording medium 1 having a layer structure shown in FIG. 5 as a rewritable phase-change optical recording medium utilizing a phase change (hereinafter, also simply referred to as an optical recording medium).
  • the optical recording medium 1 is configured such that a reflective layer 3, a recording layer 4, and a cover layer 5 as a light transmitting layer are sequentially laminated on one surface (upper surface in FIG. 1) of a substrate 2.
  • the base material 2 is formed into a flat plate shape (for example, a disk (disc) shape) having a predetermined thickness by injection molding using a resin material such as polycarbonate.
  • the reflective layer 3 is formed on the surface of the base material 2 on which fine irregularities are formed using a metal such as A1, Ag, or Ni.
  • the recording layer 4 has a first protective layer 4a, a phase change material layer 4b, and a second protective layer 4c, and these layers 4c, 4b, and 4a are laminated on the reflective layer 3 in this order. Sa It is composed.
  • the first protective layer 4 a and the second protective layer 4 c of this For example, formed by using a dielectric material such as aluminum oxide or Z n S- S i O 2, the phase change material layer 4 b is For example, it is formed using GeTeSb, InSbTe, or AgGeInSbTe.
  • the cover layer 7 is formed on the first protective layer 4a using a light-transmitting resin material.
  • the recording layer 4 is irradiated with a laser beam set on the recording layer from the force bar layer 5 side, and the recording layer 4 including the phase change material layer 4b is formed into an amorphous state.
  • the recording mark is formed and erased by reversibly changing the phase with the crystalline state.
  • the recording layer 4 particularly the phase change material layer 4b
  • the irradiated part is rapidly cooled (rapidly cooled) after being heated to a temperature higher than its melting point.
  • the recording mark becomes amorphous according to the recording signal.
  • the irradiated portion is heated to a temperature higher than a crystallization temperature and then gradually cooled (gradually cooled) to be crystallized, thereby forming a recording mark. Will be erased.
  • the light reflectance that changes with the change in the optical constant between the amorphous state and the crystalline state when a laser beam of reproduction power (a laser beam of lower power than during recording) is irradiated.
  • the data is reproduced by determining the presence or absence of a recording mark using the difference between the data.
  • the base material 2 is formed into a disk shape having fine irregularities such as a groove formed on the surface thereof by injection molding.
  • the recording layer 4 is formed on the reflective layer 3.
  • the phase change material layer 4b and the first and second protective layers 4a and 4c are generally formed by a sputtering method.
  • the cover layer 5 is formed on the recording layer 4 by, for example, spin coating.
  • the phase change material layer 4b in the recording layer 4 is in an amorphous state immediately after its formation, and cannot be recorded by the user as it is. Therefore, the user can immediately start using the optical recording medium 1.
  • the recording layer 4 In order to ship the optical recording medium 1 in the initialized state, it is necessary to initialize the recording layer 4 (particularly, the phase change material layer 4 b) in the manufacturing process of the optical recording medium 1. For this reason, after forming the force bar layer 5, the recording layer 4 is initialized.
  • the optical recording medium 1 is normally irradiated with an initialization laser beam through an objective lens having a numerical aperture NA of about 0.4 (for example, a value of 0.34).
  • optical recording medium 11 having a larger capacity based on the optical recording medium 1.
  • the optical recording medium 11 will be described with reference to FIG. Note that the same components as those of the optical recording medium 1 are denoted by the same reference numerals, and redundant description will be omitted.
  • This optical recording medium 11 is a so-called single-sided multilayer (for example, two layers) recording layer type optical recording medium (hereinafter, also referred to as “multilayer recording layer type optical recording medium”), as shown in FIG.
  • an L1 layer including a reflective layer 3 and a recording layer 4 On one side of the material 2 (the upper surface in the figure), an L1 layer including a reflective layer 3 and a recording layer 4, a spacer layer 12 as a light transmitting layer, and a recording layer 14 (hereinafter, referred to as "L 0 layer J") and a cover layer 5 as a light transmitting layer are sequentially laminated.
  • the spacer layer 12 has a thickness TH of usually 20 ⁇ .
  • the surface of the L0 layer side has fine irregularities such as groups, etc.
  • the recording layer 14 has a first protective layer 14a, a phase change material layer 14b, and a second protective layer. It has a layer 14c, and these layers 14c, 14b, 14a are laminated on the fine uneven surface of the spacer layer 12 in this order.
  • each layer 14a, 14b, 14c is formed of a strictly different material or film thickness from the corresponding layer 4a, 4b, 4c, but has the same function.
  • the cover layer 5 is formed on the L0 layer using a resin material. Even in this optical recording medium 11, the recording layers 4 and 14 need to be initialized during the manufacturing process. In this case, as shown in FIG.
  • the objective lens 21 having the same numerical aperture NA as that used when the optical recording medium 1 is initialized is used.
  • the L1 layer including the recording layer 4 is initialized by irradiating the L1 layer from the side of the cover layer 5 with the initialization laser beam LIN, and then, as shown in FIG.
  • the L0 layer is initialized by irradiating the L0 layer with the beam LIN.
  • the inventors have found the following points to be improved. That is, in this initialization method, as shown in FIG. 7, when the L 0 layer formed on the spacer layer 12 is initialized, the initialization laser beam L IN applied to the LO layer is used. A part of the laser beam LPE passes through the L 0 layer and the spacer layer 12 to reach the L 1 layer, and a part of the laser beam LRE of the laser beam LPE is reflected by the L 1 layer. In this case, interference occurs due to unevenness in the thickness of the spacer layer 12 between the reflected laser beam LRE and the laser beam LIN applied to the L0 layer.
  • the amount of light absorbed by the L O layer is partially different, and as a result, the calorific value differs for each part of the L 0 layer (heat generation unevenness occurs in the L 0 layer). Therefore, due to the re-irradiation of the reflected laser beam LRE, the crystal state of the L0 layer, particularly the phase change material layer 14b in the recording layer 14, becomes uneven, and the L0 layer is initialized well. This may not be done, and it is preferable to improve this point.
  • the present invention has been made in view of the above points to be improved, and has as its main object to provide a method of initializing a multilayer recording layer type optical recording medium capable of uniformly initializing each layer including a recording layer. And also, a multilayer recording layer capable of uniformly initializing each layer including the recording layer. It is another main object to provide an apparatus for initializing a type optical recording medium.
  • the method for initializing a multilayer recording layer type optical recording medium comprises a plurality of layers LN, L (N-1),..., L2 each including a recording layer which is initialized by light irradiation. , L
  • 1, LO N is an integer of 1 or more
  • TH ⁇
  • the apparatus for initializing a multilayer recording layer type optical recording medium includes a plurality of layers LN, L (N-1),..., Each including a recording layer initialized by light irradiation.
  • L2, L1, L0 (N is an integer of 1 or more) are laminated in this order on one surface side of a substrate, and a spacer layer is formed between the respective layers.
  • the multilayer recording layer type optical recording medium including an objective lens for irradiating one of the plurality of layers LM (N ⁇ M ⁇ 1) with light from the layer L0 side and initializing the same.
  • the objective lens has a numerical aperture NA that satisfies the following equation when the thickness of the spacer layer adjacent to the surface of the layer LM on the substrate side is TH ( ⁇ ). It is stipulated and configured.
  • the thickness of the spacer layer adjacent to the substrate side surface of the layer LM is set to TH ( ⁇ )
  • the layer L 0 is irradiated with light to initialize the layer, and the layer adjacent to the spacer layer is sandwiched. Since the influence of the reflected light from L (M + 1) can be reduced, the inside of the layer LM can be initialized uniformly. Therefore, a reliable initialized A layer recording layer type optical recording medium can be manufactured.
  • the method for initializing a multilayer recording layer type optical recording medium according to the present invention includes a plurality of layers LN, L (N-1),..., L2, L2 each including a recording layer initialized by light irradiation.
  • LO (N is an integer of 1 or more) is laminated on one surface side of the base material in this order, and a spacer layer is formed between the layers.
  • One of the layers LM (N ⁇ M ⁇ 1) is initialized by irradiating light from the layer L0 side with an objective lens having a numerical aperture NA of 0.55 or more.
  • the apparatus for initializing a multilayer recording layer type optical recording medium includes a plurality of layers LN, L (N-1),..., Each including a recording layer initialized by light irradiation.
  • L2, L1, L0 (N is an integer of 1 or more) are laminated in this order on one surface side of a base material, and a spacer layer is formed between the respective layers.
  • Initialization of a multilayer recording layer type optical recording medium including an objective lens for irradiating one layer LM (N ⁇ M ⁇ 1) of the plurality of layers from the layer L0 side and initializing the same.
  • the objective lens has a numerical aperture NA defined to have a value of 0.55 or more.
  • the layer LM when the layer LM is initialized, light is irradiated from the layer L0 side using an objective lens having a numerical aperture NA of 0.55 or more.
  • NA numerical aperture
  • FIG. 1 is an explanatory diagram for explaining an initialization method for initializing the optical recording medium 11 on which the L1 layer and the L0 layer are formed.
  • FIG. 2 is a configuration diagram showing a configuration of an initialization apparatus M for initializing the optical recording medium 11 on which the L1 layer and the L0 layer are formed.
  • FIG. 3 is a diagram showing experimental results when the initialization of the L0 layer was confirmed using various objective lenses having different numerical apertures NA.
  • FIG. 4 is an explanatory diagram for explaining an initialization method for initializing the optical recording medium 41 on which the L2 layer, the L1 layer, and the L0 layer are formed.
  • FIG. 5 is a cross-sectional view showing a schematic configuration of the optical recording medium 1 on which one recording layer 4 is formed.
  • FIG. 6 is a cross-sectional view showing a schematic configuration of the optical recording medium 11 on which the L1 layer and the L0 layer are formed.
  • FIG. 7 is an explanatory diagram for explaining an initialization method that is already performed by the inventor when initializing the optical recording medium 11 on which the L1 layer and the L0 layer are formed.
  • the optical recording medium 11 in which the recording layer is initialized by the method for initializing a multilayer recording layer type optical recording medium according to the present invention has a fine uneven surface on the base material 2 (see FIG. On the (upper surface in the figure) side, an L 1 layer, a spacer layer 12, an L 0 layer adjacent to the spacer layer 12, and a cover layer 5 are sequentially laminated.
  • Initializer M is a spindle motor MT, pickup PU, spindle server It has SPS, feed servo TR S, focus tracking servo FTS, and control unit CNT.
  • the spindle motor MT is driven and controlled by a spindle servo SPS as described later, and rotates the optical recording medium 11 at a constant linear velocity.
  • the pickup PU has a laser emitting section and a laser receiving section integrated with each other, and a laser (not shown) is driven by a laser driver under the control of the control section CNT, and the optical recording medium 11
  • the laser beam LIN set to the initialization power is emitted to the optical recording medium 11.
  • the pickup PU includes an objective lens 31 and a half mirror (not shown), and focuses the initialization laser beam L IN on the L 1 layer and the L 0 layer of the optical recording medium 11.
  • the objective lens 31 is subjected to focus tracking control by the focus tracking servo FTS, whereby the initialization laser beam LIN is focused on the L1 and L0 layers of the optical recording medium 11.
  • the objective lens 31 is configured to have a numerical aperture ⁇ ⁇ ⁇ that satisfies the following equation (1). ing.
  • the thickness ⁇ of the spacer layer 12 is set to about 20 ⁇ , as described above, and at least 16.5 ⁇ or more. Therefore, even when the spacer layer 12 is formed as the objective lens 31 with a thickness of, for example, 16.5 ⁇ , the numerical aperture ⁇ has a value of 0.5 so as to satisfy the above equation (1). Use 5 types. When the spacer layer 12 is formed with a small thickness of 13 ⁇ , a type having a numerical aperture ⁇ of 0.7 to satisfy the above equation (1) is used.
  • the pickup U is reciprocated by a feed servo TRS between the inner peripheral side and the outer peripheral side thereof along the diameter direction of the optical recording medium 11.
  • the spindle servo SPS controls the rotation of the spindle motor ⁇ ⁇ such that the linear velocity of the optical recording medium 11 becomes constant under the control of the control unit C ⁇ ⁇ .
  • Control unit C NT Controls the drive of the pickup PU, the spindle servo SPS, the feed servo TRS, and the focus tracking servo FTS.
  • the control unit CNT controls the spindle servo SPS to drive the spindle motor MT, and rotates the optical recording medium 11 so that the linear velocity becomes constant.
  • the control unit CNT moves the pickup PU to the initialization start position by controlling the feed servo TRS, and controls the focus tracking servo FTS to control the optical recording medium 11. Position the objective lens 31 so that the focal position matches the L1 layer.
  • the control unit CNT controls the feed servo TRS and the focus tracking servo FTS, thereby moving the pickup PU from, for example, the inner circumference to the outer circumference, and performing an initializing laser beam to perform IN.
  • the L1 layer including the recording layer 4 is first initialized by irradiating the L1 layer from the cover layer 5 side.
  • the control unit CNT positions the objective lens 31 so that its focal position coincides with the L0 layer, and then irradiates the initialization laser beam LIN to the LO layer, as in the case of the L1 layer.
  • the L0 layer including the recording layer 14 is initialized.
  • an objective lens 21 with a numerical aperture NA of 0.34 was used for a part of the initialization laser beam L IN irradiated to the L0 layer, as shown in Fig. 1. As before, it passes through the L0 layer and the spacer layer 12 to reach the L1 layer.
  • the spot diameter DI of the laser beam LRE irradiating the L0 layer is the spot diameter DI when the objective lens 21 is used because the numerical aperture NA of the objective lens 31 is larger than the numerical aperture NA of the objective lens 21. (See Figures 1 and 7). I mean The laser beam LRE reflected by the L1 layer when the objective lens 31 is used is sufficiently diffused.
  • the laser beam of the initialization laser beam L IN is specified to be a constant value
  • the L 0 layer is initialized, it is reflected by the L 1 layer and irradiates the L 0 layer per unit area.
  • the irradiation amount of the laser beam LRE is sufficiently lower than the irradiation amount of the laser beam LRE per unit area when the objective lens 21 is used.
  • the interference caused by the unevenness of the thickness of the spacer layer 12 occurs, but the irradiation energy of the laser beam L RE is diffused and sufficiently reduced, so that the amount of light absorbed by the L 0 layer is partially different. Phenomenon does not occur. As a result, it is possible to avoid the occurrence of unevenness in the crystallization state due to the re-irradiation of the laser beam LRE to the already initialized portion of the L 0 layer. There is a monkey.
  • the inventor has specified the thickness TH of the spacer layer 12 to be a constant value (20 ⁇ ) and used various objective lenses having different numerical apertures ⁇ to initialize the L 0 layer. Pass / fail was confirmed.
  • Figure 3 shows the results of this experiment. According to the results of this experiment, it was confirmed that when the numerical aperture ⁇ ⁇ was initialized using an objective lens having a value of 0.45 or less, all of the initialized states were defective. On the other hand, it was confirmed that when the objective lens was initialized using an objective lens having a numerical aperture NA of 0.55 or more, all the initialized states were good.
  • the L0 layer including the recording layer 14 and the L1 layer including the recording layer 4 can always be properly initialized. Also, considering that the thickness TH of the spacer layer 12 is specified to be at least 16.5 inches or more, as long as the numerical aperture NA of the objective lens is set to a value of 0.55 or more, the above value is always set. Equation (1) holds. Therefore, when the optical recording medium 11 is initialized, as long as an objective lens with a numerical aperture NA of 0.55 or more is used, L 1 The layer and the L0 layer can be satisfactorily initialized, and as a result, a highly-reliable initialized multilayer recording layer type optical recording medium can be manufactured.
  • the spacer layer 12 is formed with a small thickness of 13 / ⁇ , the above equation (1) is satisfied as long as the type having a numerical aperture NA of 0.7 is used. As long as an objective lens having a numerical aperture NA of 0.7 or more is used, the L1 layer and the L0 layer can always be properly initialized.
  • the L0 layer is initialized using the objective lens 31 having a numerical aperture NA of 0.55, so that the lower layer than the L0 layer is formed. It is possible to avoid the occurrence of the initialization unevenness due to the reflection of the initialization laser beam L IN by the L 1 layer located in the (layer far from the incident light). Therefore, the light having the reflective layer 3 formed on one surface side of the base material 2 and the one layer and the L 0 layer formed as the upper layer of the reflective layer 3 with respect to the irradiation direction of the initialization laser beam L IN.
  • the crystallization state of the L 0 layer (particularly, the phase change material layer 4 b) can be made uniform, so that the L 0 layer as the upper layer of the L 1 layer can be reliably and reliably formed. It can be initialized well.
  • the present invention is not limited to the above-described embodiment of the invention, but can be appropriately modified.
  • three or more layers having a recording layer were formed (for example, L0 and L1 layers each having a recording layer 14 and L2 layer having a recording layer 4).
  • the present invention can also be applied to the initialization of the L0 layer and the L1 layer in the optical recording medium 41.
  • the optical recording medium 41 is provided on one surface side of the base material 2 with an L2 layer having the same structure as the L1 layer in the optical recording medium 11 and a spacer layer 12 having a thickness of TH (hereinafter, referred to as “lower layer”).
  • Layer 1 2 of the optical recording medium 11 adjacent to the spacer layer 12 and having substantially the same structure as the L 0 layer of the optical recording medium 11, and substantially the same as the lower spacer layer 12.
  • a spacer layer 12 having the same structure, an L 0 layer adjacent to the spacer layer 12 and having substantially the same structure as the L 1 layer, and a cover layer 5 are stacked in this order.
  • the thickness TH of the lower spacer layer 12 must be on the other hand, an objective lens 51 with a numerical aperture NA satisfying the above equation (1) is used.
  • the laser beam LIN for initialization is irradiated in order of the L2 layer, the L1 layer, and the L0 layer, and the L2 layer including the recording layer 4, the L1 layer including the recording layer 14, and the recording layer 14 are irradiated.
  • each spacer layer 12 is formed with a thickness 16. of at least 16.5 ⁇
  • an objective lens having a numerical aperture ⁇ ⁇ that satisfies the above equation (1) and a value of 0.55 or more is always used. Used for lens 51.
  • the spot diameter DI of the laser beam LRE that is reflected by the L2 layer and irradiates the L1 layer can be increased.
  • the irradiation amount per unit area of the laser beam LRE to the L1 layer can be sufficiently reduced. Therefore, the crystallization state of the L 1 layer (particularly, the phase change material layer 14 b in the L 1 layer) can be made uniform, so that the L 1 layer as the upper layer of the L 2 layer can be reliably and well initialized. be able to.
  • the spot diameter DI of the laser beam LRE which irradiates the L0 layer by being reflected by the L2 layer is set to be the initial value for the L1 layer. It will be even more widespread than in the case of a period. Therefore, the influence of the laser beam LRE irradiation on the already initialized portion in the L0 layer is further reduced than when the L1 layer is initialized. Therefore, the L0 layer can be more properly initialized. Furthermore, when the L0 layer is initialized, the thickness TH of each spacer layer 12, 12 is the same even if some of the laser beam LPE passing through the L0 layer is reflected by the L1 layer. Then, the above expression (1) is satisfied.
  • the L0 layer can be satisfactorily initialized without being affected by the laser beam LRE reflected by the L1 layer.
  • a highly-reliable initialized multilayer recording layer type optical recording medium is obtained. Can be manufactured. Industrial applicability
  • the method for initializing the multilayer recording layer type optical recording medium according to the present invention and the method for According to the apparatus for initializing a layer recording layer type optical recording medium, when the thickness of the spacer layer adjacent to the substrate-side surface of this layer LM is set to TH ( ⁇ ) when the layer LM is initialized,
  • TH ( ⁇ ) when the layer LM is initialized
  • the layer L ( ⁇ + 1) adjacent to the spacer layer Since the influence of the reflected light from the LM can be reduced, the inside of the layer LM can be initialized uniformly.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Manufacturing Optical Record Carriers (AREA)
  • Optical Record Carriers And Manufacture Thereof (AREA)

Abstract

L'invention concerne un procédé permettant d'initialiser un support d'enregistrement optique de type à couche d'enregistrement multicouches comprenant une pluralité de couches (L1, L0) qui contiennent chacune une couche d'enregistrement devant être initialisée par rayonnement lumineux. Ces couches sont empilées dans cet ordre sur un côté d'un substrat, une couche d'espacement (12) étant formée entre les couches (L1, L0). L'initialisation d'une couche (L0) parmi la pluralité de couches (L0, L1) est effectuée par application de lumière à partir du côté de la couche (L0) à l'aide d'une lentille objet (31) possédant une ouverture numérique qui satisfait l'équation [TH x NA ≥ 9], dans laquelle TH (νm) représente l'épaisseur d'une couche d'espacement (12) adjacente à la surface du côté du substrat (2) dans la couche (L0). Ainsi, il est possible d'initialiser de façon uniforme les couches (L1, L0) contenant les couches d'enregistrement.
PCT/JP2002/010497 2001-10-15 2002-10-09 Procede et appareil permettant d'initialiser un support d'enregistrement optique de type a couche d'enregistrement multicouches WO2003034411A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2001316126A JP2005092902A (ja) 2001-10-15 2001-10-15 多層記録層型光記録媒体の初期化方法
JP2001-316126 2001-10-15

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WO2003034411A1 true WO2003034411A1 (fr) 2003-04-24

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0991700A (ja) * 1995-09-25 1997-04-04 Sony Corp 光学記録媒体の初期化方法とこれに用いる初期化装置
JP2001023236A (ja) * 1999-07-12 2001-01-26 Matsushita Electric Ind Co Ltd 光学情報記録媒体およびその初期化方法
JP2001250265A (ja) * 2000-03-07 2001-09-14 Sony Corp 多層光ディスク及びその初期化方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0991700A (ja) * 1995-09-25 1997-04-04 Sony Corp 光学記録媒体の初期化方法とこれに用いる初期化装置
JP2001023236A (ja) * 1999-07-12 2001-01-26 Matsushita Electric Ind Co Ltd 光学情報記録媒体およびその初期化方法
JP2001250265A (ja) * 2000-03-07 2001-09-14 Sony Corp 多層光ディスク及びその初期化方法

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