WO2004008441A2 - Systeme d'enregistrement et de lecture optique, support de donnees optique et utilisation de ce support - Google Patents

Systeme d'enregistrement et de lecture optique, support de donnees optique et utilisation de ce support Download PDF

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Publication number
WO2004008441A2
WO2004008441A2 PCT/IB2003/002853 IB0302853W WO2004008441A2 WO 2004008441 A2 WO2004008441 A2 WO 2004008441A2 IB 0302853 W IB0302853 W IB 0302853W WO 2004008441 A2 WO2004008441 A2 WO 2004008441A2
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WO
WIPO (PCT)
Prior art keywords
stack
recording
optical
data storage
storage medium
Prior art date
Application number
PCT/IB2003/002853
Other languages
English (en)
Other versions
WO2004008441A3 (fr
Inventor
Bob Van Someren
Ferry Zijp
Hans W. Van Kesteren
Martinus B. Van Der Mark
Cornelius A. Van Den Heuvel
Coen A. Verschuren
Original Assignee
Koninklijke Philips Electronics N.V.
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 Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Priority to AU2003242932A priority Critical patent/AU2003242932A1/en
Publication of WO2004008441A2 publication Critical patent/WO2004008441A2/fr
Publication of WO2004008441A3 publication Critical patent/WO2004008441A3/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
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/122—Flying-type heads, e.g. analogous to Winchester type in magnetic recording
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • G11B11/10532—Heads
    • G11B11/10534—Heads for recording by magnetising, demagnetising or transfer of magnetisation, by radiation, e.g. for thermomagnetic recording
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • G11B11/10582—Record carriers characterised by the selection of the material or by the structure or form
    • G11B11/10584—Record carriers characterised by the selection of the material or by the structure or form characterised by the form, e.g. comprising mechanical protection elements
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • G11B11/10582—Record carriers characterised by the selection of the material or by the structure or form
    • G11B11/10586—Record carriers characterised by the selection of the material or by the structure or form characterised by the selection of the material
    • G11B11/10589—Details
    • G11B11/10593—Details for improving read-out properties, e.g. polarisation of light
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    • 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
    • G11B7/24056—Light transmission layers lying on the light entrance side and being thinner than the substrate, e.g. specially adapted for Blu-ray® discs
    • G11B7/24059—Light transmission layers lying on the light entrance side and being thinner than the substrate, e.g. specially adapted for Blu-ray® discs specially adapted for near-field recording or reproduction
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    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
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    • 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
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    • 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
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • G11B11/1055—Disposition or mounting of transducers relative to record carriers
    • G11B11/10552—Arrangements of transducers relative to each other, e.g. coupled heads, optical and magnetic head on the same base
    • G11B11/10554—Arrangements of transducers relative to each other, e.g. coupled heads, optical and magnetic head on the same base the transducers being disposed on the same side of the carrier
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • G11B11/1055—Disposition or mounting of transducers relative to record carriers
    • G11B11/1058—Flying heads
    • 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
    • G11B7/243—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 inorganic materials only, e.g. ablative layers
    • G11B2007/24302—Metals or metalloids
    • G11B2007/24306—Metals or metalloids transition metal elements of groups 3-10
    • G—PHYSICS
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    • 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
    • G11B2007/25408—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 inorganic materials
    • G11B2007/25411—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 inorganic materials containing transition metal elements (Zn, Fe, Co, Ni, Pt)
    • 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
    • G11B2007/25408—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 inorganic materials
    • G11B2007/25417—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 inorganic materials containing Group 14 elements (C, Si, Ge, Sn)
    • 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
    • G11B2007/25706—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 transition metal elements (Zn, Fe, Co, Ni, Pt)
    • 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
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    • 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
    • G11B2007/2571—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 14 elements except carbon (Si, Ge, Sn, Pb)
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    • G11—INFORMATION STORAGE
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    • 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
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    • 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
    • G11B2007/25715—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 oxygen
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    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
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    • 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
    • G11B2007/25716—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 sulfur
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    • 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 invention relates to an optical recording and reading system for use with an optical data storage medium, said system comprising:
  • the medium having a recording stack and having a cover stack that is transparent to a focused radiation beam with a wavelength ⁇ , said cover stack having a thickness d ⁇ , said recording stack and cover stack formed sequentially on a substrate,
  • an optical head with an objective having a numerical aperture NA and from which objective the focused radiation beam emanates during recording, and adapted for recording/reading at a free working distance d F of smaller than 50 ⁇ m from an outermost surface of said medium and arranged on the cover stack side of said optical data storage medium.
  • the invention further relates to an optical data storage medium having a recording stack and having a cover stack that is transparent to a focused radiation beam with a wavelength ⁇ , said cover stack having a thickness d ⁇ ; the recording stack and the cover stack formed sequentially on a substrate.
  • the invention further relates to the use of such a medium in such a system.
  • An optical data storage medium in such a system may include a transparent substrate having a thickness between 0.6 to 1.2 mm.
  • Such medium e.g. a magneto-optical disk, may further include a transparent dielectric film which may be formed from silicon nitride, aluminum nitride, silicon oxide and/or ZnS by a so-called sputtering or a vacuum depositing operation on a surface of the transparent substrate.
  • Magneto optical recording layers including amorphous rare earth metal magnetic films such as TbFeCo, GdFeCo,
  • DyFeCo or TbFeCoCr, or pe ⁇ endicular recording films such as PtCo which may be recorded or formed by a sputtering or vacuum depositing operations; an Al-based metal reflective film mainly composed of Al, AlTi or AlCr which may be formed by a sputtering or vacuum depositing operation; and a transparent protective layer of a UN- curable resin which may be formed by a so-called spin coating operation.
  • NA numerical aperture
  • FWD free working distance
  • the allowance of the angle by which the medium surface is deviated from the pe ⁇ endicular with respect to an optical axis of the optical system is reduced under the effect of double refraction or aberration due to the thickness of the transparent substrate.
  • This transparent substrate with reduced thickness is also called cover layer or more generally cover stack.
  • Another argument for a small free working distance is the size of the coil in case of a magneto-optical data storage medium. If one wants a system with a high data rate, a large bandwidth to modulate the current through the coil is required. For data rates in the order of 100 - 200 Mbit/sec, the switching frequency of the current through the coil must be at least 1-2 GHz, in order to define sha ⁇ flanks in the switching behavior of the field. This requires a coil with a small self inductance low resistance an small parasitic capacitance. Apart from the speed of the coil, the power consumption by the coil is also an issue. Therefore it is preferable to use a small coil with a small inner diameter, e.g. smaller than 100 ⁇ m.
  • optical recording and reading system which is characterized in that dj is smaller than 50 ⁇ .
  • the thickness dj An important feature of the choice of the thickness dj is the robustness of the focus actuation system. If a medium with a cover stack, i.e. 1 or more layers, of around 20 ⁇ m or larger is used, the focus error curve of the system has two zero crossings, with might cause the focus servo to lock onto the surface of the cover stack instead of onto the recording stack. The extra zero crossing is shown in figure 3 by the curve 33. However, when a thinner cover stack is used, the focus error curve does not show an extra zero crossing, so if this type of thin cover stack medium is used, the event of a wrong lock of the focus servo is prevented. The focus error curve of a medium with a relatively thin cover stack is shown in figure 3 by curve 31. Because of this focus servo issue it is better to choose a thin cover stack. It is advantageous to use a relatively hard cover stack in order to prevent damage of the cover stack.
  • An additional advantage of such a thin cover stack is that the magnetic coil can be brought close enough to the recording stack in order to generate sufficient magnetic field in the recording stack.
  • the contamination may evaporate and condense onto the optics of the optical head.
  • the contamination may e.g. be water mixed with small quantities of other contaminants.
  • the water including other contaminants is probably present as a thin (mono)layer on the outer surface of the medium.
  • the thin (mono)layer is present very close to the recording stack and is indirectly heated by the recording stack, evaporates and subsequently condenses onto the objective including the other contaminants. This occurs relatively rapidly, i.e. within half an hour (but possibly after seconds), causes unreliable recording and reading of the system and finally may lead to total recording and reading failure.
  • An additional advantage of the application of the relatively thin cover is the prevention of the build-up of contamination onto the objective.
  • the cover layer forms an effective barrier which prevents the thin monolayer on the medium to be heated and evaporated. It was found that no harmful effect, i.e. evaporation, occurs at a relatively thin cover stack thickness of 0.5 - 1 ⁇ m or more. This can be calculated by thermally modeling the heating process by the radiation beam of the recording stack between the substrate and the cover stack (see Fig.5).
  • the optical head further comprises a magnetic coil arranged at a side of the optical head closest to the cover stack such that an optical axis of the optical head traverses the center of the magnetic coil and the recording stack of the optical data storage medium is of the magneto-optic type.
  • the magnetic coil has an inner diameter of smaller than 60 ⁇ m.
  • the use of a bigger coil would compromise the data rate and energy efficiency because bigger coils have a large inductance and higher power consumption.
  • the range of dj is set in dependency of NA and ⁇ (in ⁇ m) according to the formula: dj ⁇ lO ⁇ /NA ⁇ m.
  • the exact thickness range which is optimal depends on the specificities of the optical system, such as the NA of the objective lens and the wavelength of the radiation beam.
  • the NA of thin cover stack optical data storage media typically is larger than 0.80.
  • dx is larger than a thickness d Tm ⁇ n being a thickness where optical interference effects of the focused radiation beam in the cover stack just start having a negative effect on the reliability of recording and reading of data during recording.
  • the thickness d ⁇ m , n is proportional to the so-called confocal parameter: ⁇ /NA 2 .
  • an additional anti reflection stack is present adjacent the cover stack at a side most remote from the substrate. This has the advantage that less radiation beam energy is lost at the outer surface of the medium. Furthermore the strength of the focus error signal coming from the outer surface is substantially reduced and therefore locking onto the outer surface layer instead of on the recording stack is less likely.
  • the anti reflection stack comprises layers selected from the group TaO 2 , SiO 2 , SiN and MgF 2 .
  • Figure 1 A shows an embodiment of the system according to the invention with small free working distance optics used in an MO drive
  • Figure IB shows the structure of the layer stack of the medium of Fig.1 A
  • Figure 2 shows the magnetic field strength as function of distance to the magnetic coil
  • Figure 3 shows focus error curves at different cover stack thicknesses
  • Figure 4A shows the optical surface of the objective of the optical head before first recording
  • Figure 4B shows the optical surface after contamination build-up.
  • Figure 5 shows modeling results of the temperature profile in z direction with and without cover layer.
  • FIG. 1A and IB an embodiment is shown of an optical recording and reading system for use with an optical data storage medium 5.
  • the medium 5 comprises a recording stack 9 and has a cover stack 7 that is transparent to a focused radiation beam 1.
  • the wavelength ⁇ of the radiation beam 1 is 405 nm.
  • Said recording stack 9 and cover stack 7 are formed sequentially on a substrate 8 e.g. by sputtering.
  • An optical head 3, with an objective 2, having a numerical aperture NA
  • An additional anti reflection stack 11 is present in the cover stack 7 at a position most remote from the substrate 8.
  • the anti reflection stack 11 comprises layers selected from
  • a suitable cover stack design in this order, e.g. is:
  • the anti reflection stack 11 comprises 4 layers and is especially suitable when the outer portion of the radiation beam is incident substantially non- pe ⁇ endicularly, e.g. 60- 70 degrees, when a high NA of e.g. 0.90 is used.
  • the anti reflection stack 11 comprises 2 layers and is especially suitable when a relatively low NA of e.g. ⁇ 0.50 is used.
  • the cover stack 7 can be applied by techniques such as spin- or dip coating, vapor deposition and usage of a plastic foil/adhesive combination, e.g. a pressure sensitive adhesive (PSA).
  • PSA pressure sensitive adhesive
  • the optical head 3 further comprises a magnetic coil 4 arranged at a side of the optical head 3 closest to the cover stack 7.
  • An optical axis of the optical head 3 traverses the center of the magnetic coil 4 and the recording stack 9 of the optical data storage medium 5 is of the magneto-optic type.
  • the recording stack 9 may e.g. include, in this order, a reflective metal layer as known in the art e.g. Al, other auxiliary layers, a 50 nm layer of the magnetic material GdFeCo and a 35 nm interference layer of SiN or ZnS/ SiO 2 .
  • TbFeCo as magnetic material instead of GdFeCo gives similar results.
  • Fig. 2 a plot is shown of the strength of the magnetic field at an axial distance from the magnetic coil. This plot clarifies why the range of working distance is only a few tens of microns for a typical high speed coil.
  • Fig. 3 three focus error curves 31, 32 and 33 are shown.
  • Curve 31 (solid) corresponds to a 4 ⁇ m
  • curve 32 (dash-dot) to a 8 ⁇ m
  • curve 33 (dashed) to a 25 ⁇ m cover stack 11 thickness. Note the extra zero crossing when the cover is around 25 ⁇ m.
  • the vertical lines indicate the position of the focal point in each case.
  • Fig. 4A shows the optical surface of the objective 3 when is it still clean and
  • Fig. 4B shows the surface after contamination build-up due to redeposition of evaporated contamination of a medium which does not contain a cover stack 7.
  • Application of a cover stack solves the problem of contamination build-up.
  • Fig. 5 thermal modeling result are presented.
  • the temperature is normalized to 1 in the recording stack.
  • the solid curve which corresponds to the temperature profile including a cover layer (stack) 7, shows a rapid decay of temperature in just half a ⁇ m. From this it may be deduced that effective thermal insulation already is achieved at a cover thickness of a half a ⁇ m or more.
  • an optical recording and reading system for use with an optical data storage medium.
  • the system comprises the medium having a recording stack and a cover stack that is transparent to a focused radiation beam which has a wavelength ⁇ in air.
  • the cover stack has a thickness dj.
  • the recording stack and cover stack are formed sequentially on a substrate.
  • An optical head with an objective having a numerical aperture NA and from which objective the focused radiation beam emanates during recording, is adapted for recording/reading at a free working distance d F of smaller than 50 ⁇ m from an outermost surface of said medium and arranged on the cover stack side of said optical data storage medium.
  • d F free working distance

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  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Record Carriers And Manufacture Thereof (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Optical Head (AREA)

Abstract

L'invention concerne un système d'enregistrement et de lecture optique susceptible d'être utilisé avec un support de données optique (5). Dans ce système, le support (5) comporte une pile d'enregistrement (9) et une pile de couverture (7) transparente à un faisceau de rayonnement ciblé (1) de longueur d'onde μ dans l'air. La pile de couverture (7) a une épaisseur dT. La pile d'enregistrement (9) et la pile de couverture (7) sont établies séquentiellement sur un substrat (8). Une tête optique (3) comporte un objectif (2) à ouverture numérique NA, depuis lequel le faisceau de rayonnement ciblé (1) est diffusé durant l'enregistrement. Ladite tête permet l'enregistrement/la lecture à une distance de travail libre dF inférieure à 50 νm par rapport à la surface la plus éloignée du support (5). Elle est placée du côté de la pile de couverture (7) du support (5). Lorsque DT est inférieure à 50μ, on assure un enregistrement et une lecture fiables, en particulier grâce à l'absence de problèmes de servomécanisme de focalisation.
PCT/IB2003/002853 2002-07-10 2003-06-25 Systeme d'enregistrement et de lecture optique, support de donnees optique et utilisation de ce support WO2004008441A2 (fr)

Priority Applications (1)

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AU2003242932A AU2003242932A1 (en) 2002-07-10 2003-06-25 Optical recording and reading system, optical data storage medium and use of such medium

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EP02077782.7 2002-07-10
EP02077782 2002-07-10

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Citations (11)

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WO1998049675A1 (fr) * 1997-04-29 1998-11-05 Terastor Corporation Systeme de memoire electro-optique a tete flottante pour enregistrement en champ proche et lecture
WO1999035645A1 (fr) * 1998-01-06 1999-07-15 Imation Corp. Support d'enregistrement magneto-optique ayant un seuil de champ de desaimantation reduit
EP0977192A1 (fr) * 1997-04-14 2000-02-02 Toray Industries, Inc. Dispositif d'enregistrement optique et support d'enregistrement optique
US6044056A (en) * 1996-07-30 2000-03-28 Seagate Technology, Inc. Flying optical head with dynamic mirror
EP0994466A2 (fr) * 1998-10-16 2000-04-19 Sharp Kabushiki Kaisha Dispositif à tête magnéto-optique comprenant une lentille auxillaire intégrée, tête de reproduction magnétique et dispositif d'enregistrement et de reproduction utilisant ce dispositif à tête magnéto-optique
US6160769A (en) * 1997-08-07 2000-12-12 Hitachi Maxell, Ltd. Optical recording medium and optical recording device
JP2001023244A (ja) * 1999-07-09 2001-01-26 Sony Corp 光記録媒体およびその製造方法と、光記録装置
US6243327B1 (en) * 1999-01-08 2001-06-05 Sony Corporation Magneto-optical disk system having a relation between a numerical aperture of an objective lens and the thickness of a cover layer
US6298018B1 (en) * 1998-03-09 2001-10-02 Sharp Kabushiki Kaisha Optical recording and reproducing method optical recording and reproducing device, and optical recording medium
WO2002035536A1 (fr) * 2000-10-27 2002-05-02 Koninklijke Philips Electronics N.V. Dispositif de lecture optique
US20020054974A1 (en) * 2000-05-26 2002-05-09 Tosoh Corporation Surface-side reproducing type optical recording medium

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6044056A (en) * 1996-07-30 2000-03-28 Seagate Technology, Inc. Flying optical head with dynamic mirror
EP0977192A1 (fr) * 1997-04-14 2000-02-02 Toray Industries, Inc. Dispositif d'enregistrement optique et support d'enregistrement optique
WO1998049675A1 (fr) * 1997-04-29 1998-11-05 Terastor Corporation Systeme de memoire electro-optique a tete flottante pour enregistrement en champ proche et lecture
US6160769A (en) * 1997-08-07 2000-12-12 Hitachi Maxell, Ltd. Optical recording medium and optical recording device
WO1999035645A1 (fr) * 1998-01-06 1999-07-15 Imation Corp. Support d'enregistrement magneto-optique ayant un seuil de champ de desaimantation reduit
US6298018B1 (en) * 1998-03-09 2001-10-02 Sharp Kabushiki Kaisha Optical recording and reproducing method optical recording and reproducing device, and optical recording medium
EP0994466A2 (fr) * 1998-10-16 2000-04-19 Sharp Kabushiki Kaisha Dispositif à tête magnéto-optique comprenant une lentille auxillaire intégrée, tête de reproduction magnétique et dispositif d'enregistrement et de reproduction utilisant ce dispositif à tête magnéto-optique
US6243327B1 (en) * 1999-01-08 2001-06-05 Sony Corporation Magneto-optical disk system having a relation between a numerical aperture of an objective lens and the thickness of a cover layer
JP2001023244A (ja) * 1999-07-09 2001-01-26 Sony Corp 光記録媒体およびその製造方法と、光記録装置
US20020054974A1 (en) * 2000-05-26 2002-05-09 Tosoh Corporation Surface-side reproducing type optical recording medium
WO2002035536A1 (fr) * 2000-10-27 2002-05-02 Koninklijke Philips Electronics N.V. Dispositif de lecture optique

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Title
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 16, 8 May 2001 (2001-05-08) & JP 2001 023244 A (SONY CORP), 26 January 2001 (2001-01-26) *

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AU2003242932A8 (en) 2004-02-02
AU2003242932A1 (en) 2004-02-02
WO2004008441A3 (fr) 2004-04-22
TW200414143A (en) 2004-08-01

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