WO2009040239A1 - Support d'enregistrement optique enregistrable - Google Patents
Support d'enregistrement optique enregistrable Download PDFInfo
- 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
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 52
- 239000010949 copper Substances 0.000 claims abstract description 35
- 229910052802 copper Inorganic materials 0.000 claims abstract description 25
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 22
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000010703 silicon Substances 0.000 claims abstract description 21
- 239000000758 substrate Substances 0.000 claims abstract description 19
- 238000004544 sputter deposition Methods 0.000 claims description 6
- 229910001316 Ag alloy Inorganic materials 0.000 claims description 4
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 4
- 229910052709 silver Inorganic materials 0.000 claims description 4
- 239000004332 silver Substances 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910000838 Al alloy Inorganic materials 0.000 claims description 2
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 239000010410 layer Substances 0.000 description 134
- 238000002310 reflectometry Methods 0.000 description 20
- 238000004088 simulation Methods 0.000 description 5
- 229910010272 inorganic material Inorganic materials 0.000 description 4
- 239000011147 inorganic material Substances 0.000 description 4
- 238000000151 deposition Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 239000002355 dual-layer Substances 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000012782 phase change material Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
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
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 |
Family
ID=39897807
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2008/061873 WO2009040239A1 (fr) | 2007-09-24 | 2008-09-08 | Support d'enregistrement optique enregistrable |
Country Status (1)
Country | Link |
---|---|
WO (1) | WO2009040239A1 (fr) |
Cited By (2)
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)
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 |
-
2008
- 2008-09-08 WO PCT/EP2008/061873 patent/WO2009040239A1/fr active Application Filing
Patent Citations (5)
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)
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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