WO2009040239A1 - Support d'enregistrement optique enregistrable - Google Patents

Support d'enregistrement optique enregistrable Download PDF

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Publication number
WO2009040239A1
WO2009040239A1 PCT/EP2008/061873 EP2008061873W WO2009040239A1 WO 2009040239 A1 WO2009040239 A1 WO 2009040239A1 EP 2008061873 W EP2008061873 W EP 2008061873W WO 2009040239 A1 WO2009040239 A1 WO 2009040239A1
Authority
WO
WIPO (PCT)
Prior art keywords
layer
thickness
film
storage medium
optical storage
Prior art date
Application number
PCT/EP2008/061873
Other languages
English (en)
Inventor
Larisa Von Riewel
Christophe Fery
Original Assignee
Thomson Licensing
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 Thomson Licensing filed Critical Thomson Licensing
Publication of WO2009040239A1 publication Critical patent/WO2009040239A1/fr

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—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
    • G11B7/2433—Metals or elements of Groups 13, 14, 15 or 16 of the Periodic Table, e.g. B, Si, Ge, As, Sb, Bi, Se or Te
    • 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
    • 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
    • G11B7/24067—Combinations of two or more layers with specific interrelation
    • 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
    • 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
    • G11B7/259—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 silver

Definitions

  • the present invention relates to a optical recording medium, which comprises a substrate layer, a recording layer, a reflecting layer and a cover layer, the recording layer consisting essentially of an inorganic material.
  • the optical recording medium is in particular suitable for recording of data with a laser having a wavelength of about 405 nm and for reading of data with a laser having a wavelength of about 650 nm.
  • Optical storage media are media in which data are stored in an optically readable manner, for example by means of a pickup comprising a laser for illuminating the optical storage medium and comprising a photo-detector for detecting the reflected light from the storage media.
  • a large variety of optical storage media are known, which are operated with different laser wavelength, and which have different sizes for providing storage capacities from below one Gigabyte up to 50 Gigabyte (GB) .
  • the formats include read-only formats such as Audio CD and Video DVD, write-once optical media like DVD+R and DVD-R as well as rewritable formats like CD-RW, DVD-RW, DVD+RW and DVD-RAM for example. Digital data are stored in these media along tracks in one or more layers of the media.
  • the storage medium with the highest data capacity is at present the Blu-Ray disc (BD) , which allows to store up to 50 GB on a dual layer disc.
  • BD Blu-Ray disc
  • a recording layer a phase change material is used for a Blu-Ray disc.
  • Further information about the Blu-Ray disc system is available for example from the Blu-Ray group via Internet: www.blu-raydisc.com.
  • For reading and writing of data of a DVD an optical pickup having a laser wavelength of 650 nm is used.
  • a recordable DVD a recording layer with an organic dye is used. Additional information about the specification of read only and recordable DVDs can be obtained for example from the DVD forum.
  • a storage medium of this kind allows it therefore for example to record a movie in a store from a server within a short time, on request of a user, which the user can replay later at home with his DVD player.
  • an optical storage medium having a recording layer with an organic dye is less suitable .
  • Optical storage media having a recording layer consisting of an inorganic material are also known in the meanwhile, for example from US 7,018,695, which describes an optical recording medium having a recording layer with a first recording film containing an element selected from a group consisting of Si, Ge, C, Sn, Au, Zn and Cu as a primary component and a second recording film containing Cu as a primary component.
  • a further optical storage medium having a recording layer with an inorganic material comprising a first recording film with Si as a main component and a second recording film with Cu as a main component is known from US
  • a recordable storage medium Ml of this kind is shown in a cross section in figure 1 in a simplified manner.
  • the recordable storage medium Ml comprises a substrate layer 1, on which a dielectric layer 6 is arranged.
  • the first film 2 is deposited on top of the dielectric layer 6 and the second film 3 is deposited on top of the first film 2 for example by means of sputtering.
  • a second dielectric layer 7 is arranged above the recording layer 2, 3 then a second dielectric layer 7 is arranged.
  • the two dielectric layers 6 and 7 contain essentially for example the material ZnS-SiO 2 and are arranged as a protection layer for the recording layer 2, 3.
  • a reflective layer 4 for example an aluminum layer, is arranged, on which as a final layer a cover layer 5 is placed.
  • a laser beam L is applied from below the optical storage medium Ml, penetrating first the substrate layer 1.
  • the storage medium Ml as shown in figure 1 provides a high reflectivity when a wavelength of 405 nm is used, but when using a wavelength of about 650 nm, the reflectivity is comparatively low and therefore, no sufficient signal-to- noise ratio can be obtained, when using a DVD pickup for reading of data from the storage medium Ml .
  • the recordable optical storage medium comprises a substrate layer, a recording layer, a cover layer, a reflecting layer arranged between the recording layer and the cover layer, and a first and a second dielectric layer for a protection of the recording layer.
  • the first dielectric layer is arranged on the substrate layer, on which a first film of the recording layer is arranged comprising essentially copper.
  • the recording layer comprises further a second film containing essentially silicon, element Si, which is arranged on top of the first film of the recording layer.
  • the first dielectric layer is arranged in particular between the first film of the recording layer and the substrate layer and the second dielectric layer is arranged between the second film of the recording layer and the reflective layer .
  • the recordable optical storage medium is a disk with outside dimensions, cover layer and substrate layer similar to a DVD.
  • the thickness of the first dielectric layer is advantageously in a range of 40 - 100 nm, and the thickness of the second dielectric layer within a range of 5 - 30 nm.
  • the thicknesses of the films with the copper layer and of the silicon layer are each within a range of 2 - 20 nm and can be manufactured on the first dielectric layer successively by means of a sputtering method.
  • the thickness of the copper layer is preferably larger than the thickness of the silicon layer, the thickness of the copper layer being within a range of 8 - 12 nm and the thickness of the silicon layer being within a range of 4 - 8 nm.
  • the thickness of the first dielectric layer is advantageously in a range of 40 - 100 nm, and the thickness of the second dielectric layer within a range of 50 - 120 nm, to provide a high reflectivity of the recording layer.
  • the optical storage medium is designed in particular as a write-once-read-many (WORM) optical storage disc, on which data can be recorded with a laser wavelength of 405 nm and read with a red laser, e.g. wavelength of 650 nm, and the WORM disc has physical properties, according to which a consumer DVD player recognizes the WORM disc as a DVD ROM disc.
  • WORM write-once-read-many
  • the thicknesses of the two films of the recoding layer and of the two dielectric layers are optimized for providing a high push/pull signal when recording data with a Blu-laser beam on the recordable optical storage medium, and for providing a low push/pull signal for reading of the respective data with a red laser beam.
  • Fig. 1 an optical storage medium with a recording layer consisting of an inorganic material according to prior art
  • Fig. 2 a recordable optical storage medium comprising a recording layer in accordance with the invention
  • Fig. 3 reflectivity and modulation values of a recordable optical storage medium according to the invention in dependency of the thickness of the second dielectric layer at a wavelength of 650 nm
  • Fig. 4 normalized push/pull signals in dependency of the thickness of the second dielectric layer of an optical storage medium according to the invention at a wavelength of 650 nm.
  • the optical storage medium M2 comprises a substrate layer 11, a recording layer with two films 12, 13 arranged between first and second dielectric layers 16, 17, the first dielectric layer 16 being placed on the substrate layer 10 and the second dielectric layer 17 being placed on the recording layer, and a reflective layer 14 being arranged between the second dielectric layer 17 and a cover layer 15, similar to the optical storage medium Ml as shown in figure 1.
  • the first film 12 with a copper layer Cu is arranged as a first recording layer on top of the first dielectric layer 16, and then, the second film 13 with a silicon layer Si is deposited on top of the copper layer 12.
  • the first and second dielectric layers 16, 17 are arranged in particular as protective layers for the recording layer, for improving the optical performance of the storage medium M2.
  • the copper layer has a more stable consistency.
  • the copper layer reacts readily with the silicon when the copper is deposited. This can be overcome by depositing first the copper layer 12, and then depositing the silicon layer 13 on top of the copper layer 12, as shown in figure 2.
  • the copper layer 12 and the silicon layer 13 can be arranged on the first dielectric layer 16 for example by means of sputtering, also the first and second dielectric layers 16, 17. Further, also the reflective layer 14 is preferably deposited by means of sputtering.
  • the substrate layer 11 consists of a 0,6 mm polycarbonate substrate, the reflective layer 14 of a 100 nm silver or silver alloy, aluminum or aluminum alloy layer, and the cover layer 15 has a thickness of about 0,1 mm.
  • the thickness of the copper layer Cu and the silicon layer Si have for example each a value in a range of 2 - 20 nm, with the thickness of the copper layer being larger that the thickness of the silicon layer.
  • the recordable optical storage medium is in particular an optical disc with outside dimensions similar to a DVD.
  • the thickness of the cover layer are in particular within a range of 0,5 - 0,15 mm, the thickness of the substrate layer in a range of 0,5 - 0,7 mm, and the thickness of the first dielectric layer 16 in a range of 40 - 70 nm.
  • the thickness of the reflective layer 14 may vary within a range of ⁇ 200 nm.
  • reflectivity values R and modulation factors M of recordable optical storage media in accordance with figure 2 are shown for a wavelength of 650 nm and for various thicknesses d2 of the second dielectric layer 17.
  • the measured reflectivity values R show, that in a range of 30 - 60 nm for the thickness d2, the reflectivity is below 40% and therefore too low for practical applications for optical storage media.
  • the reflectivity is above 45%, and therefore sufficiently high.
  • the reflectivity is increasing sharply, reaching a reflectivity value of 0,5 at a thickness d2 of about 70 nm, and obtaining almost a reflectivity value of 1,0 at a thickness d2 of 120 nm.
  • a highly reflective layer arrangement does not allow a high modulation factor M of the data signal, which is required for providing a high signal-to-noise ratio, respectively a low bit error rate, because then the change in reflectivity between marks and spaces is too low to provide required modulation values M, as shown in figure 3.
  • the thickness d2 has to be less than about 70 nm.
  • a laser recording power of about 24 - 26 mW is required, to provide sufficiently low jitter values.
  • simulations have been performed, in which the thickness of the reflectivity layer has been modified. According to the simulations, when using a silver layer with a thickness in a range of 50 - 90 nm, jitter values below 8% can be obtained with a laser write power below 20 mW.
  • An optical storage medium of this kind can be use therefore for recording of data with a Blu-Ray type or HD-DVD type laser, wavelength e.g. 405 nm, and which can be read with a red laser with a wavelength of 650 nm, having a push/pull signal below 18%, reflectivity value above 45%, modulation value above 50%, and a jitter below 8%.

Landscapes

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

Abstract

La présente invention concerne un support d'enregistrement optique enregistrable qui comporte une couche de substrat (11), une couche d'enregistrement (12, 13), une couche de recouvrement (15), une couche réfléchissante (14) disposée entre la couche d'enregistrement et la couche de recouvrement, une première couche diélectrique (16) disposée entre la couche de substrat et la couche d'enregistrement, et une seconde couche diélectrique (17) disposée entre la couche d'enregistrement et la couche réfléchissante. La couche d'enregistrement (12, 13) comporte un premier film (12) contenant principalement du cuivre disposé sur la première couche diélectrique (16) et un second film (13) contenant principalement du silicium disposé entre le premier film (12) et la seconde couche diélectrique (17). Les épaisseurs du premier film (12) et du second film (13) sont en particulier comprises chacune entre 2 et 20 nm, l'épaisseur du premier film (12) étant plus importante que l'épaisseur du second film (13), et l'épaisseur (d1) de la première couche diélectrique (16) étant plus importante que l'épaisseur (d2) de la seconde couche diélectrique (17).
PCT/EP2008/061873 2007-09-24 2008-09-08 Support d'enregistrement optique enregistrable WO2009040239A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP07117083 2007-09-24
EP07117083.1 2007-09-24
EP07117082.3 2007-09-24
EP07117082 2007-09-24

Publications (1)

Publication Number Publication Date
WO2009040239A1 true WO2009040239A1 (fr) 2009-04-02

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2261905A1 (fr) 2009-06-12 2010-12-15 Thomson Licensing Support d'enregistrement optique compatible
EP2360689A1 (fr) * 2010-02-15 2011-08-24 Thomson Licensing Stratégie d'écriture et procédé pour écrire sur un support d'enregistrement optique compatible

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5974025A (en) * 1997-08-15 1999-10-26 Ricoh Company, Ltd. Optical recording medium and recording and reproducing method using the same
US20040152016A1 (en) * 2003-01-08 2004-08-05 Tdk Corporation Optical recording medium
EP1457977A1 (fr) * 2001-11-29 2004-09-15 TDK Corporation Procede de regulation de facteur de reflexion de support d'enregistrement optique de type worm et support d'enregistrement optique worm
US20040241581A1 (en) * 2003-05-30 2004-12-02 Tdk Corporation Optical information-recording medium
US7141289B2 (en) * 2003-08-25 2006-11-28 Tdk Corporation Optical information recording medium

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5974025A (en) * 1997-08-15 1999-10-26 Ricoh Company, Ltd. Optical recording medium and recording and reproducing method using the same
EP1457977A1 (fr) * 2001-11-29 2004-09-15 TDK Corporation Procede de regulation de facteur de reflexion de support d'enregistrement optique de type worm et support d'enregistrement optique worm
US20040152016A1 (en) * 2003-01-08 2004-08-05 Tdk Corporation Optical recording medium
US20040241581A1 (en) * 2003-05-30 2004-12-02 Tdk Corporation Optical information-recording medium
US7141289B2 (en) * 2003-08-25 2006-11-28 Tdk Corporation Optical information recording medium

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2261905A1 (fr) 2009-06-12 2010-12-15 Thomson Licensing Support d'enregistrement optique compatible
WO2010142547A1 (fr) * 2009-06-12 2010-12-16 Thomson Licensing Support d'enregistrement optique compatible
EP2360689A1 (fr) * 2010-02-15 2011-08-24 Thomson Licensing Stratégie d'écriture et procédé pour écrire sur un support d'enregistrement optique compatible

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