US20030137921A1 - On-groove recordation type optical disc - Google Patents

On-groove recordation type optical disc Download PDF

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Publication number
US20030137921A1
US20030137921A1 US10/321,543 US32154302A US2003137921A1 US 20030137921 A1 US20030137921 A1 US 20030137921A1 US 32154302 A US32154302 A US 32154302A US 2003137921 A1 US2003137921 A1 US 2003137921A1
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Prior art keywords
layer
optical
characteristic
changeable
optical disc
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Takanobu Higuchi
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Pioneer Corp
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Pioneer Corp
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Publication of US20030137921A1 publication Critical patent/US20030137921A1/en
Priority to US11/233,422 priority Critical patent/US7263057B2/en
Abandoned legal-status Critical Current

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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
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
    • G11B7/254—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of protective topcoat layers
    • G11B7/2542—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of protective topcoat layers consisting essentially of organic resins
    • 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
    • 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
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
    • G11B7/257—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers
    • G11B2007/25705—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials
    • G11B2007/25708—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials containing group 13 elements (B, Al, Ga)
    • 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
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
    • G11B7/257—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers
    • G11B2007/25705—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials
    • G11B2007/25713—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials containing nitrogen
    • 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
    • G11B7/00455—Recording involving reflectivity, absorption or colour changes
    • 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
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
    • G11B7/244—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising organic materials only
    • G11B7/246—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising organic materials only containing dyes
    • 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
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
    • G11B7/253—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates
    • G11B7/2533—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates comprising resins
    • G11B7/2534—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates comprising resins polycarbonates [PC]
    • 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
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
    • G11B7/258—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of reflective layers
    • G11B7/2585—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of reflective layers based on aluminium

Definitions

  • the present invention relates to a write once type optical disc.
  • conventional write once optical discs such as CD-R (recordable) and DVD-R
  • a transparent, resin substrate has guide grooves on one surface of the substrate.
  • an organic dye is applied by spin coating.
  • a metallic reflection layer made from for example gold, silver (or silver alloy) and aluminum (or aluminum alloy) is formed on the organic dye layer.
  • a protection layer such as an ultraviolet ray curing resin (referred to as “cover layer”) is applied on the metallic reflection layer.
  • a laser beam for information recording is radiated on the substrate side. The laser beam decomposes the organic dye so that a refractive index changes. Heat generated by the laser beam also deforms the guide grooves and the reflection layer. As a result, pits are formed on the optical disc as recorded information.
  • DVR Digital Video Recorder
  • a violet laser is utilized as a light source for information recordation and retrieval, and an object lens having a high numerical aperture such as 0.85 or more is employed.
  • a cover layer of the DVR has a thickness of about 0.1 mm, and the laser beam is radiated on the cover layer side. This suppresses an influence of optical aberration caused when the object lens having a high numerical aperture is used. This in turn increases a recording density so that a large quantity of information can be recorded on the optical disc.
  • a write once optical disc utilizing the DVR system is referred to as “DVR-R disc” or “DVR-blue disc”.
  • the direction of the laser beam radiation is different from the DVR-R disc compared to the conventional write once optical disc such as CD-R disc and DVD-R disc.
  • the accumulating direction of the layers formed on the resin substrate of the DVR-R disc is opposite that of the CD-R and DVD-R. This is sometimes called a “reverse stack” structure.
  • the DVR-R disc needs a dielectric protection layer to protect the organic dye layer from a non-cured ultraviolet curing resin during formation of the cover layer.
  • the ultraviolet curing resin forms the cover layer.
  • the structure and manufacturing method of the DVR-R disc are different from the CD-R disc and DVD-R disc.
  • the DVR-R disc should be manufactured with materials and structure particularly suited for the DVR-R disc.
  • An object of the present invention is to provide a DVR-R disc which can have smaller recordation marks (indicia) to achieve large quantity recordation.
  • an optical disc comprising: a resin substrate having the grooves on a surface thereof; a reflection layer formed over the surface of the resin substrate such that the reflection layer has a concavo-convex shape corresponding to the grooves; a characteristic-changeable layer formed over the reflection layer, the characteristic-changeable layer having an optical characteristic which varies when a light beam is radiated; a light-transmissive protection layer formed over the characteristic-changeable layer; and a light-transmissive cover layer formed over the protection layer for sealing the reflection layer, characteristic-changeable layer and protection layer to the resin substrate, wherein hardness of the resin substrate is greater than hardness of the cover layer, at least after the optical characteristic of the optical characteristic-changeable layer changes upon radiation of a light beam to a convex portion of the optical characteristic-changeable layer.
  • the characteristic-changeable layer deforms when the light beam is radiated to the characteristic-changeable layer. Since the substrate is harder than the cover layer, the substrate deforms less than the cover layer when the characteristic-changeable layer deforms. It is therefore possible to record information on the convex portion between the grooves on the optical disc at a high density.
  • Heat is generated at the convex portion of the characteristic-changeable layer as the light beam is radiated to the convex portion.
  • the optical disc may be configured such that heat is transferred toward the protection layer in a greater amount than toward the reflection layer.
  • FIG. 1A illustrates a schematic overall view of an optical disc according to a first embodiment of the present invention
  • FIG. 1B illustrates a cross sectional view of the optical disc shown in FIG. 1A taken along a radius of the optical disc;
  • FIG. 1C illustrates an enlarged cross sectional view of an organic dye layer and neighboring layers shown in FIG. 1B;
  • FIG. 2A illustrates a cross sectional view of a DVR-R disc to show deformations of respective layers in the DVR-R disc when information is recorded;
  • FIG. 2B is similar to FIG. 2A and illustrates deformations of respective layers in a different DVR-R disc
  • FIG. 3A illustrates a cross sectional view of a DVR-R disc to show occurrence of crosswrite when information is recorded
  • FIG. 3B illustrates a cross sectional view of a different DVR-R disc which can prevent the crosswrite.
  • FIGS. 1A to 1 C a DVR-R disc according to a first embodiment of the present invention will be described.
  • An optical disc (DVR-R disc) 8 includes a resin substrate 10 , which is made from a macromolecular material such as polycarbonate and polyolefin.
  • a plurality of grooves 12 are formed on a lower surface (i.e., the surface on which information is recorded) of the substrate 10 .
  • the grooves define information tracks between the grooves.
  • the grooves 12 wobble to define addresses (or to provide address information) of data recorded on the disc. Specifically, projections between the grooves 12 (i.e., lands 16 ) are formed with a wobble, and information is recorded on a recording layer formed on the lands 16 . This recordation scheme is called “on-groove recordation”.
  • a reflection layer 13 is formed over the grooves 12 .
  • a material of the reflection layer 13 is, for example, aluminum, aluminum alloy, silver or silver alloy. The thin reflection layer can therefore have high reflectance.
  • An organic dye layer 14 is applied over the reflection layer 13 .
  • the organic layer 14 is made by, for example, spin-coating an organic dye. Because the on-groove recordation scheme is employed in this embodiment, the organic dye layer 14 has to have a sufficient thickness over the lands 16 between the grooves 12 .
  • a ratio of the organic dye layer thickness in the groove to the organic dye layer thickness on the land 16 is between approximately 2:1 and 3:2. If the organic dye layer has to have a thickness of 30 nm to sufficiently record information, then the organic dye layer thickness on the land 16 is 30 nm and the organic dye layer thickness in the groove is approximately 45-60 nm. If the groove depth is 40 nm, therefore, the groove of the substrate is entirely filled with the organic dye. Further, since the organic dye layer in the groove projects from the groove by 5-20 nm, the organic dye layer in the groove is continuous to the organic dye layer on an adjacent land 16 by the 5-20 nm thickness.
  • a protection layer 15 is formed over the organic dye layer 14 and a cover layer 11 is formed over the protection layer 15 .
  • the protection layer 15 protects the organic dye layer 14 from an ultraviolet curing resin of the cover layer 11 .
  • the protection layer 15 is made from a dielectric material. Specifically, the protection layer 15 is made from a metallic oxide such as SiOx and AlOx or a metallic nitride such as SiNx and AlNx because the protection layer 15 should protect the organic dye layer and be highly transparent.
  • the cover layer 11 is made from, for example, a macromolecular resin such as polycarbonate.
  • the cover layer 11 is transparent since the laser beam for information recordation passes through the cover layer 11 .
  • the above mentioned “hardness” is an indentation hardness.
  • the “hardness” is Brinell hardness (JIS-Z2243), Vickers hardness (JIS-Z2244), Rockwell hardness (JIS-Z2245) or pencil hardness (JIS-K5400).
  • JIS-Z2243 Brinell hardness
  • Vickers hardness JIS-Z2244
  • Rockwell hardness JIS-Z2245
  • pencil hardness JIS-K5400
  • conditional equation for the “hardness”of the optical disc layers is not limited to the above described equation in this embodiment.
  • a refractive index of the organic dye layer changes with a temperature which elevates as the laser beam is radiated for information recordation.
  • T a certain temperature which causes a significant non-linear volumetric expansion in the organic dye layer, such as the pyrolysis temperature of the dye, the melting temperature of the dye and the sublimation temperature of the dye.
  • the indentation hardness test a surface layer (up to several tens nm from the surface) of the test material can be ignored. In this embodiment, therefore, the reflection layer 13 (approximately 20 nm in thickness) formed on the substrate 10 and the protection layer 15 (approximately 50 nm in thickness) formed on the cover layer 11 can be ignored. Accordingly, it can be assumed that the hardness Ha represents the hardness of the substrate itself and the hardness Hb represents the hardness of the cover layer itself.
  • a master disc which has grooves to be formed on the substrate 10 was prepared by an electron-beam recorder and electron resist.
  • a nickel stamper was then created from the master disc by electroforming.
  • a resin substrate 10 was formed from the nickel stamper by injection molding.
  • a material of the resin substrate 10 was polycarbonate.
  • the substrate 10 was about 120 mm in diameter, about 1.1 mm in thickness, about 40 nm in groove depth, 320 nm in track pitch, and 130 nm in land width.
  • the land width is equal to an interval between adjacent grooves 12 . Lateral walls of the groove 12 had about 90-degree inclination.
  • a reflection layer 13 was formed over the grooves 12 of the substrate 10 .
  • the reflection layer 13 having a thickness of about 20 nm was fabricated by sputtering.
  • the reflection layer 13 has a concavo-convex shape corresponding to the a concavo-convex shape of the grooves 12 .
  • an organic dye was applied over the reflection layer 13 by spin coating such that the resulting organic dye layer 14 had a thickness of about 40 nm on each land 16 and a thickness of about 60 nm in each groove 12 .
  • a protection layer 15 was then formed over the organic dye layer 14 such that the protection layer 15 had a thickness of 50 nm.
  • the protection layer 15 was made from aluminum nitride (AlNx).
  • the aluminum nitride was prepared by reactive sputtering, with aluminum being used as a target and Ar—N2(10:1) used as a reactive gas.
  • the cover layer 11 was a polycarbonate film having an approximately 0.095 mm thickness, and fixed by a ultraviolet curing adhesive.
  • the DVR-R disc 8 fabricated in this manner underwent a pencil hardness test. The test showed that the substrate hardness was HB and the cover layer hardness was 2 B.
  • the laser beam is radiated to the cover layer 11 of the optical disc 8 when recording information on the optical disc 8 in this embodiment.
  • the laser beam is transmitted through the cover layer 11 and protection layer 15 and converges on the organic dye layer 14 between the grooves 12 (or on the land 16 ), thereby forming a beam spot 20 on the land 16 .
  • the laser beam causes the thermal decomposition of the organic dye so that the refractive index of the organic dye changes. This change of the refractive index is irreversible. Therefore, the changed refractive index does not return to the original refractive index after the laser beam radiation is finished and the temperature of the organic dye layer drops to room temperature. This is a principle of information recording on the organic dye layer 14 at the land portion 16 .
  • the volume of the organic dye expands and generates a stress in the organic dye layer 14 in and around the laser beam spot 20 . Therefore, if the substrate 10 is softer than the cover layer 11 , deformations caused by the stress disperse to the reflection layer 13 and substrate 10 , as indicated by the phantom lines shown in FIG. 2A. In particular, the deformation of the reflection layer 13 adversely influences the information recorded on the tracks when retrieving the recorded information.
  • the DVR-R disc 8 When the information is retrieved from the DVR-R disc 8 , reflection of the laser beam from the reflection layer 13 is utilized. Therefore, if the reflection layer 13 has deformed, a retrieved signal includes a large distortion. Particularly, the DVR-R disc has a very small track pitch to increase a recording density, as compared with a general DVD-R. Spacing between marks, which are created on the disc when the information is recorded by the laser beam spot 20 , is also small. Therefore, the deformed reflection layer is likely to affect the retrieved signal and cause crosstalk or interference between adjacent tracks.
  • the resin substrate 10 is always harder than the cover layer 11 , or the resin substrate 10 is harder than the cover layer 11 when the refractive index of the organic dye layer changes upon laser beam radiation.
  • the stress generated due to volumetric expansion of the organic dye layer 14 disperses to the cover layer 11 , as indicated by the phantom lines in FIG. 2B.
  • This deforms the protection layer 15 and cover layer 11 but does not deform the reflection layer 13 and substrate 10 . Consequently, the optical disc having the above described structure can prevent occurrence of crosstalk and deformation of the reflection layer 13 . This structure prevents deformation of the reflection layer, which would otherwise adversely influence quality of the retrieved information.
  • the refractive index of the organic dye layer 14 can be set to be very close to the refractive index of the cover layer 11 (and that of the protection layer 15 ) because of characteristics of the material.
  • the refractive index difference may be about 0.1-1.0.
  • the cover layer 11 and protection layer 15 are both transparent so that the deformed cover layer and deformed protection layer do not deteriorate the information retrieval quality.
  • FIGS. 1A to 1 C are also relevant in this embodiment when the structure of the optical disc 8 is referred to. Similar reference numerals and symbols are used in FIGS. 1A, 1B, 1 C, 3 A and 3 B.
  • the second embodiment is particularly directed to an optical disc which includes materials which are optimal for preventing occurrence of crosswrite.
  • Crosswrite is a phenomenon in which the heat of the organic dye generated by the laser beam radiated during information recordation interferes with adjacent information recording tracks.
  • the optical disc 8 of the second embodiment records information on an organic dye layer 14 at lands 16 between grooves 12 .
  • the laser beam creates a beam spot 20 on the lands 16 for information recordation.
  • This is an on-groove recordation scheme.
  • the organic dye layer 14 on the land 16 is continuous to the organic dye layer 14 in the adjacent grooves 12 by a thickness of 5-20 nm in the neighboring track direction.
  • the optical disc 8 has a metallic reflection layer 13 .
  • the reflection layer 13 is made from a material having high thermal conductivity. A contact area between the organic dye layer 14 and the reflection layer 13 is smaller on the land 16 than in the groove 12 .
  • the optical disc 8 of the second embodiment is configured such that the heat transfer from the beam spot 20 is greater in the laser beam radiation direction (up and down directions in FIG. 3A, and referred to as “vertical directions”) than in the neighboring track directions (referred to as “horizontal directions”).
  • the heat transfer in the vertical directions can be categorized in two directions, namely one directed to the reflection layer 13 and one directed to the protection layer 15 .
  • the reflection layer 13 is made from a metal having high thermal conductivity, the amount of heat transfer toward the reflection layer 13 is relatively large. If the heat transfer toward the protection layer 15 is greater than the heat transfer toward the reflection layer 13 , the sum of the heat transfer in the vertical directions (up and down directions in FIG. 3B) becomes significantly greater than the heat transfer in the horizontal directions. Such optical disc 8 is illustrated in FIG. 3B. As shown, most of the heat generated at the beam spot 20 in the organic dye layer 14 is transferred in the vertical directions, and only a small amount of heat is transferred in the horizontal directions.
  • Thermal conductivities of the respective layers of the optical disc 8 are not sufficient to determine an amount of heat transfer.
  • a rectangular parallelepiped extending in the vertical direction from the interface between the organic dye layer 14 and the adjacent layer (the reflection layer 13 or the protection layer 15 ) is used to determine an amount of heat transfer from the organic dye layer 14 in the vertical direction.
  • the amount of heat transfer is determined by:
  • the positioning of the rectangular parallelepiped is determined as follows.
  • the center line of the rectangular parallelepiped extends on the drawing sheet of FIG. 3B in the up and down directions, and extends through the center of the beam spot 20 .
  • the bottom of the rectangular parallelepiped is a square having a size “d” ⁇ “d” where “d” represents the diameter of the beam spot 20 .
  • the height of the upper rectangular parallelepiped is defined by the organic dye layer-reflection layer interface and the reflection layer-substrate interface.
  • the height of the upper rectangular parallelepiped is equal to the thickness of the reflection layer 13 .
  • the height of the lower rectangular parallelepiped is defined by the organic dye layer-protection layer interface and the protection layer-cover layer interface.
  • the height of the lower rectangular is equal to the thickness of the protection layer 15 .
  • the sizes of the upper and lower rectangular parallelepipeds and the materials of the respective layers of the optical disc 8 are determined such that the following equation is established:
  • Sa represents the bottom square of the upper rectangular parallelepiped
  • La represents the thickness of the reflection layer 13
  • Ca represents the thermal conductivity of the reflection layer
  • Sb represents the bottom square of the lower rectangular parallelepiped
  • Lb represents the thickness of the protection layer 15
  • Cb represents the thermal conductivity of the protection layer 15 .
  • each layer in the optical disc 8 differs from a point at the groove bottom to a point at the groove lateral wall. Further, each layer does not have a perfectly uniform thickness on the land. In this embodiment, therefore, the thickness of the layer (La or Lb) is an average value of the thickness of the layer lying over the land.
  • NA numerical aperture
  • the beam spot diameter d is given by the following equation:
  • the beam spot diameter d is almost 250 nm (d ⁇ 250 nm) in this embodiment.
  • the thermal conductivity of the reflection layer 13 is about 240 W/m/K.
  • the thermal conductivity of the protection layer 15 is about 120-200 W/m/K although the protection layer thermal conductivity varies with the method of making the protection layer and manufacturing conditions.
  • Amounts of heat transfer from the beam spot 20 (or the organic dye layer 14 ) in the vertical directions of the optical disc 8 are calculated from the above mentioned values and equation. The calculation results are shown below:
  • the heat transfer toward the reflection layer 13 is:
  • the heat transfer toward the protection layer 15 is:
  • the present invention is not limited to the above described embodiments.
  • the condition Sb ⁇ Lb ⁇ Cb ⁇ Sa ⁇ La ⁇ Ca is required in the second embodiment, but it is satisfactory if amounts of heat transfer in the right and left directions in FIG. 3A (i.e., the right and left unshaded arrows Cal in FIG. 3A) are reduced to prevent the crosswrite to adjacent lands.

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US10/321,543 2002-01-21 2002-12-18 On-groove recordation type optical disc Abandoned US20030137921A1 (en)

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JP2002010987A JP2003217174A (ja) 2002-01-21 2002-01-21 グルーブ間記録方式による光ディスク
JP2002-10987 2002-01-21

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US11/233,422 Expired - Fee Related US7263057B2 (en) 2002-01-21 2005-09-22 On-groove recordation type optical disc

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EP (1) EP1477976A4 (zh)
JP (1) JP2003217174A (zh)
CN (1) CN1623198A (zh)
MY (1) MY141498A (zh)
TW (1) TWI241580B (zh)
WO (1) WO2003063153A1 (zh)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030090990A1 (en) * 2001-10-12 2003-05-15 Fuji Photo Film Co., Ltd. Optical information recording medium
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US7263057B2 (en) 2007-08-28
EP1477976A4 (en) 2008-02-20
WO2003063153A1 (fr) 2003-07-31
EP1477976A8 (en) 2005-01-19
EP1477976A1 (en) 2004-11-17
US20060015887A1 (en) 2006-01-19
CN1623198A (zh) 2005-06-01
TW200302468A (en) 2003-08-01
MY141498A (en) 2010-04-30
TWI241580B (en) 2005-10-11
JP2003217174A (ja) 2003-07-31

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