WO2004102552A2 - Support optique d'enregistrement de donnees inscriptible une seule fois - Google Patents

Support optique d'enregistrement de donnees inscriptible une seule fois Download PDF

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Publication number
WO2004102552A2
WO2004102552A2 PCT/IB2004/050636 IB2004050636W WO2004102552A2 WO 2004102552 A2 WO2004102552 A2 WO 2004102552A2 IB 2004050636 W IB2004050636 W IB 2004050636W WO 2004102552 A2 WO2004102552 A2 WO 2004102552A2
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WO
WIPO (PCT)
Prior art keywords
layer
data storage
storage medium
optical data
recording
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/IB2004/050636
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English (en)
Other versions
WO2004102552A3 (fr
Inventor
Hubert C. F. Martens
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke Philips NV
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Koninklijke Philips Electronics NV
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Filing date
Publication date
Application filed by Koninklijke Philips Electronics NV filed Critical Koninklijke Philips Electronics NV
Publication of WO2004102552A2 publication Critical patent/WO2004102552A2/fr
Publication of WO2004102552A3 publication Critical patent/WO2004102552A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • G11B7/2403—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
    • 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
    • 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
    • G11B2007/24304—Metals or metalloids group 2 or 12 elements (e.g. Be, Ca, Mg, Zn, Cd)
    • 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
    • G11B2007/2431—Metals or metalloids group 13 elements (B, Al, Ga, In)
    • 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
    • G11B2007/24312—Metals or metalloids group 14 elements (e.g. 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
    • G11B7/2407—Tracks or pits; Shape, structure or physical properties thereof
    • G11B7/24073—Tracks
    • G11B7/24079—Width or depth

Definitions

  • An embodiment of an optical data storage medium as described in the opening paragraph is known from Japanese Patent Application JP-2001-101709.
  • Dyes are widely used as the data-storage recording layer in write-once optical data storage media such as CD-R and DVD+R.
  • An advantage of dye-based optical data storage media or optical record carriers is the high reflection of the media, which provides backwards compatibility of the recorded media in read only (ROM) players. The high reflection is made possible because of the intrinsic transparency of the dye material at the wavelength of the laser used for recording and reading the data. By adding a reflector layer behind the dye layer, a medium having a relatively high reflection is obtained.
  • inverted stacks for the Ll layer, i.e. the layer farthest from the laser beam, in dual-layer DVD+R media based on dye materials.
  • the term inverted stack refers to the order of layer deposition in the fabrication process being opposite from that of convential optical record carriers such as CD-R and DVD+R.
  • the reflector layer is deposited directly on the substrate whereafter the recording layer is deposited on top of the reflector layer.
  • a protective layer and/or spacer-layer is deposited .
  • JP2001-101709 discloses a write-once stack structure of the "MIM" type consisting of a first metal layer (M), a dielectric layer (I), and a second metal reflective layer (M) respectively. Recording of a pit or mark occurs by melting the first metal layer, which results in a (permanent) hole in the thin metal layer. Due to the presence of the relatively thick second metal layer a high reflection is possible.
  • MIM first metal layer
  • I dielectric layer
  • M second metal reflective layer
  • the reflection R is defined as the fraction of the incident radiation intensity that is returned from the recording stack and the modulation M is defined as (R-Rm)/R wherein Rm is the reflection when a pit or mark is present.
  • Modulation M defined here should not be confused with the M in the "MIM" recording stack as described above where M refers to a metal layer. The context will make clear which of the two is meant.
  • an optical data storage medium of the type mentioned in the opening paragraph which has improved sensitivity of the recording stack combined with an acceptably high R*M product.
  • This object is achieved by an optical data storage medium according to the invention which is characterized in that the metallic layer has a k m > 3.5, preferably k m > 6.
  • the metallic layer has a k m > 3.5, preferably k m > 6.
  • Applicants have found that a relatively thin and therefore relatively sensitive metallic layer of the recording stack structure is possible when k m of the metallic layer is larger than 3.5. At this relatively low thickness still an acceptably high R*M value is achieved.
  • the mentioned materials of the metallic layer in JP2001 -101709 have k m values below 3.5.
  • n m ⁇ 3 because for a given k m and d m the reflection of the MIM stack drops below acceptable values when n m increases above this range. More preferably n m ⁇ 2 for even higher reflection values.
  • Suitable materials as interference layer include dielectrics such as e.g. SiO x , ZnS-Si0 2 , MgO, ZnS, MgF 2 , Ta 2 Os, AI 2 O3, et cetera.
  • the interference layer is resistant against influences of the radiation beam.
  • the recording stack is formed adjacent a guide groove, also called pre-groove or tracking groove, having a depth g ⁇ ⁇ /(4*rip) where n p is the refractive index of the transparent protection layer.
  • a guide groove is generally used to guide the radiation beam spot by means of an opto-mechanical servo system.
  • the groove depth should not exceed the preferred range in order to avoid deterioration of the optical servo signal and/or the read out signal of written pits or marks.
  • ⁇ is approximately 655 nm.
  • the guide groove adjacent the MIM recording stack structure has a depth g ⁇ ⁇ /(10*n p ).
  • the metallic layer comprises Al.
  • Al is a metal that is relatively easy to deposit, cheap and frequently used.
  • the relatively thin layer thickness achieves a relatively high temperature increase in this layer during recording. This is advantageous for a relatively high sensitivity of the medium.
  • the metallic layer preferably comprises an alloy of Al and least one other element, which alloy has a melting point below 500° C, e.g. AlGe, AlMg or AlSi.
  • a further recording stack comprising a further write once recording layer, and a further transparent protection layer are present between the transparent protection layer and the entrance face.
  • the recording stack according to the invention may successfully be used as the deepest recording stack in a dual or multi stack optical data storage medium. In case of a dual stack medium this deepest stack sometimes is also called Ll . Deepest refers to the stack farthest from the entrance face.
  • the further recording stack is of the same type as the recording stack according to the invention.
  • the reflective layer may be made relatively thin and semi-transparent to the radiation beam in order to allow the radiation beam to pass to deeper recording stacks.
  • the further write-once recording stack i.e. LO stack
  • a write-once recording layer being a suitable organic dye layer, e.g. an azo dye.
  • the reflective layer usually comprises a metal, but any highly reflective material may be used.
  • the reflective layer of the deepest stack may comprise any metal with suitable reflection including Al.
  • the reflective layer of stacks between the entrance face and the deepest stack preferably comprises a metal suitable as a semi transparent reflective layer e.g. Au, Cu and Ag. These materials have a relatively high transmission value at a suitable layer thickness.
  • Fig. la shows a schematic cross section layout of an embodiment of the optical data storage medium including a MIM recording stack according to the invention
  • Fig. lb shows a schematic cross section layout of another embodiment of the optical data storage medium including two MIM recording stacks according to the invention
  • Fig. 2 shows a normalized calculated maximum temperature profile of a stack (T norm as a function of the depth d s in the stack) according to the invention (21) and a stack according to prior art (22);
  • Fig. 4 shows the calculated R*M for different metallic layers as a function of the Si0 2 thickness di in a stack: Al / Si0 2 / metallic layer
  • Fig. 5 shows the calculated modulation M as a function of the reflection for different metallic layers in a stack: Al / Si0 2 / metallic layer;
  • Fig. 6 shows the calculated modulation M as a function of k m *d m / ⁇ for different values of k m of the metallic layer for a stack: 100 nm Al(reflective layer)/70 nm Si ⁇ 2 /metallic layer.
  • Fig. 7 shows the experimentally measured modulation M of an 1 IT mark as a function of the write power P w for 3 different stacks according to the invention at a recording speed of 9.22 m/s.
  • the beam 9 enters the medium 10 at an entrance face 8.
  • the beam 9 further propagates through a transparent protection layer 5.
  • the metallic layer 4 is present at a position closer to the entrance face 8 than the reflective layer 2.
  • the layers of the recording stack 6 were deposited by sputtering.
  • the transparent protection layer 5 was deposited by spin coating a UV-curable resin.
  • the metallic layer may also comprise an alloy of Al and least one other element, which alloy has a melting point below 500° C e.g. AlGe, AIMg or AlSi. Using such an alloy will enhance the sensitivity of the recording stack.
  • the reflective layer comprises Al and has a thickness of 100 nm. Alternative materials for the reflective layer are e.g. Ag, Au, Cu or metal alloys.
  • FIG. lb another embodiment of an optical data storage medium according to the invention is shown.
  • Reference numerals 1 -6, 8 and 9 correspond to the description of Fig. la.
  • a further recording stack 6' comprising a further write once recording layer 4', and a further transparent protection layer 5' are present between the transparent protection layer 5 and the entrance face 8.
  • the further recording stack 6' is of the same type as the recording stack 6 and layer 2', 3' and 4' are made of the same material as layers 2, 3 and 4.
  • Layers 3' and 4' have nearly the same thickness as layers 3 and 4 but the thickness of the reflective layer 2' is 10 nm or less, which is relatively thin in order to allow the laser light 9 to pass to stack 6.
  • the reflective layer 2' is preferably made of Ag, Au, Cu or alloys thereof.
  • Al has a relatively low transmission value and is preferably not used as reflective layer 2' in such a dual stack medium.
  • the further recording stack 6' may also comprise an organic dye- type write once recording layer, e.g. an azo dye, instead of the metallic layer 4' in which case the interference layer 3' may be omitted. Only one metallic layer may be required, e.g. reflective layer 2' serving as semi-transparent reflector. It is even feasible that interference layer 3' serves as semi-transparent reflective layer in which case metallic layer 2' may be omitted.
  • the thickness of the interference layer and its refractive index should be chosen such to achieve optimal R and M.
  • Fig. 2 results of thermal calculations are shown by way of a normalized calculated maximum temperature profile of different stacks (T n0 rm as a function of the depth d s in the stack).
  • the different stacks are Al/Si ⁇ 2 /Al and Al/Si ⁇ 2 /AuSi.
  • the Si ⁇ 2 thickness was taken in both cases such that the effective reflection of the stacks was about the same, i.e. the same amount of optical power is absorbed.
  • Graph 21 100 nm Al/70 nm Si02/5 nm Al/polycarbonate.
  • Graph 22 100 nm Al/85 nm Si02/25 nm AuSi/polycarbonate.
  • Fig. 3a and 3b results of optical calculations of reflection R and modulation M for in-groove recording that have been performed for stacks with AuSi and Al thin metallic layers as a function of Si0 2 thickness (Al/Si ⁇ 2/thin metal stacks) are shown.
  • In- groove means that the direction of the guide groove at which the laser is focused is directed away from the entrance face.
  • the calculations for M are based on the assumption that a permanent hole is formed in the metallic layer during recording.
  • On-groove recording meaning that the direction of the guide groove at which the laser is focused is directed towards the entrance face, gives lower (worse) M values.
  • Fig. 4 the calculated R*M value for different metallic layers as a function of the Si ⁇ 2 layer thickness di in a stack: Al / Si0 2 / metallic layer is shown.
  • the advantage of the Al thin metallic layer compared to the AuSi thin metallic layer becomes more clear when comparing the reflection*modulation (R*M) product: stacks with thin Al-layer obtain a high R*M product even at a relatively thin metallic layer thickness.
  • Fig. 5 the modulation M as a function of reflection R is shown for different metallic layers.
  • similar (or somewhat higher) R and M values are obtained for metallic layers 4 that are about 3 to 4 times thinner in case of Al compared to the case of AuSi. This is beneficial for the sensitivity of the recording stack.
  • Fig. 6 the calculated modulation M for different k m values of the metallic layer 4 as a function of k m *d_ ⁇ is shown.
  • the recording stack structure is: 100 nm Al(reflective layer)/70 nm S ⁇ (interference layer)/metallic layer.
  • Fig. 7 in-groove recording results are shown for signal modulation M at a recording velocity 9.22 m/s.
  • the modulation M was measured by writing an 1 IT mark as a function of the write power P w (in W) for 3 different stacks according to the invention at a recording speed of 9.22 m/s. Modulation values of more than 0.6 are achieved.
  • the recording velocity of 9.22 m/s is relatively high compared to the recording velocity in JP-2001-101709 where, at 3.49 m/s, 10-12 mW of recording power is needed. Because recording power is about proportional to the recording velocity a comparable result is achieved.
  • JP2002- 101709 uses an AuSi alloy with a melting point ⁇ 400 °C while in the experiment of Fig.
  • any reference signs placed between parentheses shall not be construed as limiting the claim.
  • the word “comprising” does not exclude the presence of elements or steps other than those listed in a claim.
  • the word “a” or “an” preceding an element does not exclude the presence of a plurality of such elements.
  • the mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

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  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Optical Record Carriers And Manufacture Thereof (AREA)

Abstract

L'invention concerne un support (10) optique d'enregistrement de données inscriptible une seule fois au moyen d'un faisceau (9) de rayons focalisés. Le faisceau, qui a une longueur d'onde μ, pénètre dans le support par une face d'entrée (8) et se propage à travers une couche (5) transparente de protection. Sur un côté du support sont agencées une pile d'enregistrement (6) avec une couche métallique (4) ayant un indice complexe de réfraction ñm = nm i.km à la longueur d'onde μ et une épaisseur dm, une couche de réflexion (2) et une couche (3) transparente d'interférence intercalée entre la première et la deuxième couches. Cette couche métallique se situe dans une position plus rapprochée de la face d'entrée (8) que la couche de réflexion (2). La couche métallique (4) a un indice km supérieur à 3,5, de préférence supérieur à 6, ce qui permet d'obtenir une sensibilité accrue de la pile d'enregistrement et un produit acceptablement élevé de la modulation par la réflexion.
PCT/IB2004/050636 2003-05-16 2004-05-11 Support optique d'enregistrement de donnees inscriptible une seule fois Ceased WO2004102552A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP03101394.9 2003-05-16
EP03101394 2003-05-16

Publications (2)

Publication Number Publication Date
WO2004102552A2 true WO2004102552A2 (fr) 2004-11-25
WO2004102552A3 WO2004102552A3 (fr) 2005-02-10

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PCT/IB2004/050636 Ceased WO2004102552A2 (fr) 2003-05-16 2004-05-11 Support optique d'enregistrement de donnees inscriptible une seule fois

Country Status (2)

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TW (1) TW200509113A (fr)
WO (1) WO2004102552A2 (fr)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR960700503A (ko) * 1994-03-25 1996-01-20 마에다 카쯔노수케 광기록매체(Optical Recording Medium)
TW340864B (en) * 1995-07-20 1998-09-21 Mitsui Toatsu Chemicals Optical recording medium
EP0777224B1 (fr) * 1995-12-01 2002-07-03 Samsung Electronics Co., Ltd. Milieu d'enregistrement optique et procédé d'enregistrement optique
US5925433A (en) * 1995-12-01 1999-07-20 Akzo Nobel N.V. Optical recording medium based on Fabry-Perot principle
EP1065663A3 (fr) * 1999-06-30 2002-02-06 Sony Corporation Support d'enregistrement optique
JP3866016B2 (ja) * 1999-07-02 2007-01-10 Ｔｄｋ株式会社 光情報媒体およびその再生方法
JP2002117576A (ja) * 2000-10-03 2002-04-19 Tdk Corp 光記録媒体および光学的情報記録方法

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WO2004102552A3 (fr) 2005-02-10
TW200509113A (en) 2005-03-01

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